Installing Foreman Server nightly on Debian/Ubuntu

1. Preparing your environment for installation

Before you install Foreman, ensure that your environment meets the following requirements.

1.1. System requirements

The following requirements apply to the networked base operating system:

x86_64 architecture
4-core 2.0 GHz CPU at a minimum
A minimum of 4 GB RAM is required for Foreman server to function. Foreman running with less RAM than the minimum value might not operate correctly.
Administrative user (root) access
Full forward and reverse DNS resolution using a fully-qualified domain name

Foreman only supports UTF-8 encoding. If your territory is USA and your language is English, set en_US.utf-8 as the system-wide locale settings. For more information about configuring system locale in Enterprise Linux, see Configuring the system locale in Red Hat Enterprise Linux 9 Configuring basic system settings.

Foreman server and Smart Proxy server do not support shortnames in the hostnames. When using custom certificates, the Common Name (CN) of the custom certificate must be a fully qualified domain name (FQDN) instead of a shortname. This does not apply to the clients of a Foreman.

Before you install Foreman server, ensure that your environment meets the requirements for installation.

Foreman server must be installed on a freshly provisioned system that serves no other function except to run Foreman server. The freshly provisioned system must not have the following users provided by external identity providers to avoid conflicts with the local users that Foreman server creates:

www-data
foreman
foreman-proxy
postgres
puppet
redis

Synchronized system clock

The system clock on the base operating system where you are installing your Foreman server must be synchronized across the network. If the system clock is not synchronized, SSL certificate verification might fail.

1.2. Storage requirements

The following table details storage requirements for specific directories. These values are based on expected use case scenarios and can vary according to individual environments.

Table 1. Storage requirements for a Foreman server installation
Directory	Installation Size	Runtime Size
/var/log	10 MB	10 GB
/var/lib/postgresql	100 MB	20 GB
/usr	10 GB	Not Applicable
/opt/puppetlabs	500 MB	Not Applicable

1.3. Supported operating systems

The following operating systems are supported by the installer, have packages, and are tested for deploying Foreman:

Table 2. Operating systems supported by foreman-installer
Operating System	Architecture	Notes
Debian 12 (Bookworm)	amd64
Ubuntu 22.04 (Jammy)	amd64

Foreman community advises against using an existing system because the Foreman installer will affect the configuration of several components.

1.4. Supported browsers

Using the most recent version of a major browser is highly recommended, as Foreman and the frameworks it uses offer limited support for older versions.

The recommended requirements are as follows for major browsers:

Google Chrome – latest version
Microsoft Edge – latest version
Apple Safari – latest version
Mozilla Firefox – latest version
Mozilla Firefox Extended Support Release (ESR) – latest version

Other browsers may work unpredictably.

The Foreman web UI and command-line interface is translated into various languages.

1.5. Port and firewall requirements

For the components of Foreman architecture to communicate, ensure that the required network ports are open and free on the base operating system. You must also ensure that the required network ports are open on any network-based firewalls.

Use this information to configure any network-based firewalls. Note that some cloud solutions must be specifically configured to allow communications between machines because they isolate machines similarly to network-based firewalls. If you use an application-based firewall, ensure that the application-based firewall permits all applications that are listed in the tables and known to your firewall. If possible, disable the application checking and allow open port communication based on the protocol.

Integrated Smart Proxy

Foreman server has an integrated Smart Proxy and any host that is directly connected to Foreman server is a Client of Foreman in the context of this section. This includes the base operating system on which Smart Proxy server is running.

Clients of Smart Proxy

Hosts which are clients of Smart Proxies, other than Foreman’s integrated Smart Proxy, do not need access to Foreman server.

Required ports can change based on your configuration.

The following tables indicate the destination port and the direction of network traffic:

Table 3. Foreman server incoming traffic
Destination Port	Protocol	Service	Source	Required For	Description
53	TCP and UDP	DNS	DNS Servers and clients	Name resolution	DNS (optional)
67	UDP	DHCP	Client	Dynamic IP	DHCP (optional)
69	UDP	TFTP	Client	TFTP Server (optional)
443	TCP	HTTPS	Smart Proxy	Foreman API	Communication from Smart Proxy
443, 80	TCP	HTTPS, HTTP	Client	Global Registration	Registering hosts to Foreman Port 443 is required for registration initiation, uploading facts, and sending installed packages and traces Port 80 notifies Foreman on the `/unattended/built` endpoint that registration has finished
5910 – 5930	TCP	HTTPS	Browsers	Compute Resource’s virtual console
8000	TCP	HTTP	Client	Provisioning templates	Template retrieval for client installers, iPXE or UEFI HTTP Boot
8000	TCP	HTTPS	Client	PXE Boot	Installation
8140	TCP	HTTPS	Client	Puppet agent	Client updates (optional)
8443	TCP	HTTPS	Foreman	Smart Proxy API	Smart Proxy functionality
8443	TCP	HTTPS	Client	OpenSCAP	Configure Client (if the OpenSCAP plugin is installed)
8443	TCP	HTTPS	Discovered Node	Discovery	Host discovery and provisioning (if the discovery plugin is installed)

Any host that is directly connected to Foreman server is a client in this context because it is a client of the integrated Smart Proxy. This includes the base operating system on which a Smart Proxy server is running.

A DHCP Smart Proxy performs ICMP ping or TCP echo connection attempts to hosts in subnets with DHCP IPAM set to find out if an IP address considered for use is free. This behavior can be turned off using foreman-installer --foreman-proxy-dhcp-ping-free-ip=false.

Note	Some outgoing traffic returns to Foreman to enable internal communication and security operations.

Table 4. Foreman server outgoing traffic
Destination Port	Protocol	Service	Destination	Required For	Description
	ICMP	ping	Client	DHCP	Free IP checking (optional)
7	TCP	echo	Client	DHCP	Free IP checking (optional)
22	TCP	SSH	Target host	Remote execution	Run jobs
22, 16514	TCP	SSH SSH/TLS	Compute Resource	Foreman originated communications, for compute resources in libvirt
53	TCP and UDP	DNS	DNS Servers on the Internet	DNS Server	Resolve DNS records (optional)
53	TCP and UDP	DNS	DNS Server	Smart Proxy DNS	Validation of DNS conflicts (optional)
53	TCP and UDP	DNS	DNS Server	Orchestration	Validation of DNS conflicts
68	UDP	DHCP	Client	Dynamic IP	DHCP (optional)
80	TCP	HTTP	Remote repository	Content Sync	Remote repositories
389, 636	TCP	LDAP, LDAPS	External LDAP Server	LDAP	LDAP authentication, necessary only if external authentication is enabled. The port can be customized when `LDAPAuthSource` is defined
443	TCP	HTTPS	Foreman	Smart Proxy	Smart Proxy Configuration management Template retrieval OpenSCAP Remote Execution result upload
443	TCP	HTTPS	Amazon EC2, Azure, Google GCE	Compute resources	Virtual machine interactions (query/create/destroy) (optional)
443	TCP	HTTPS	Infoblox DHCP Server	DHCP management	When using Infoblox for DHCP, management of the DHCP leases (optional)
623			Client	Power management	BMC On/Off/Cycle/Status
5000	TCP	HTTPS	OpenStack Compute Resource	Compute resources	Virtual machine interactions (query/create/destroy) (optional)
5900 – 5930	TCP	SSL/TLS	Hypervisor	noVNC console	Launch noVNC console
5985	TCP	HTTP	Client	WinRM	Configure Client running Windows
5986	TCP	HTTPS	Client	WinRM	Configure Client running Windows
7911	TCP	DHCP, OMAPI	DHCP Server	DHCP	The DHCP target is configured using `--foreman-proxy-dhcp-server` and defaults to localhost ISC and `remote_isc` use a configurable port that defaults to 7911 and uses OMAPI
8443	TCP	HTTPS	Client	Discovery	Smart Proxy sends reboot command to the discovered host (optional)
8443	TCP	HTTPS	Smart Proxy	Smart Proxy API	Management of Smart Proxies

1.6. Enabling connections from a client to Foreman server

Smart Proxies and Content Hosts that are clients of a Foreman server’s internal Smart Proxy require access through Foreman’s host-based firewall and any network-based firewalls.

Use this procedure to configure the host-based firewall on the system that Foreman is installed on, to enable incoming connections from Clients, and to make the configuration persistent across system reboots. For more information on the ports used, see Port and firewall requirements in Installing Foreman Server nightly on Debian/Ubuntu.

If you do not use firewall-cmd to configure the Linux firewall, implement using the command of your choice.

Procedure

Allow access to services on Foreman server:

# firewall-cmd \
--add-service=dns \
--add-service=dhcp \
--add-service=tftp \
--add-service=http \
--add-service=https \
--add-service=foreman-proxy \
--add-service=puppetmaster

Make the changes persistent:
```
# firewall-cmd --runtime-to-permanent
```

Verification

Enter the following command:
```
# firewall-cmd --list-all
```

1.7. Verifying DNS resolution

Verify the full forward and reverse DNS resolution using a fully-qualified domain name to prevent issues while installing Foreman.

Procedure

Ensure that the host name and local host resolve correctly:

# ping -c1 localhost
# ping -c1 `hostname -f` # my_system.domain.com

Successful name resolution results in output similar to the following:

# ping -c1 localhost
PING localhost (127.0.0.1) 56(84) bytes of data.
64 bytes from localhost (127.0.0.1): icmp_seq=1 ttl=64 time=0.043 ms

--- localhost ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.043/0.043/0.043/0.000 ms

# ping -c1 `hostname -f`
PING hostname.gateway (XX.XX.XX.XX) 56(84) bytes of data.
64 bytes from hostname.gateway (XX.XX.XX.XX): icmp_seq=1 ttl=64 time=0.019 ms

--- localhost.gateway ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.019/0.019/0.019/0.000 ms

To avoid discrepancies with static and transient host names, set all the host names on the system by entering the following command:
```
# hostnamectl set-hostname name
```

Warning

Name resolution is critical to the operation of Foreman. If Foreman cannot properly resolve its fully qualified domain name, many options fail, such as provisioning.

2. Preparing your environment for Foreman installation in an IPv6 network

You can install and use Foreman in an IPv6 network. Before installing Foreman in an IPv6 network, view the limitations and ensure that you meet the requirements.

To provision hosts in an IPv6 network, after installing Foreman, you must also configure Foreman for the UEFI HTTP boot provisioning. For more information, see Configuring Foreman for UEFI HTTP boot provisioning in an IPv6 network.

2.1. Limitations of Foreman installation in an IPv6 network

Foreman installation in an IPv6 network has the following limitations:

You can install Foreman and Smart Proxies in IPv6-only systems, dual-stack installation is not supported.
Although Foreman provisioning templates include IPv6 support for PXE and HTTP (iPXE) provisioning, the only tested and certified provisioning workflow is the UEFI HTTP Boot provisioning. This limitation only relates to users who plan to use Foreman to provision hosts.

2.2. Requirements for Foreman installation in an IPv6 network

Before installing Foreman in an IPv6 network, ensure that you meet the following requirements:

You must deploy an external DHCP IPv6 server as a separate, unmanaged service to bootstrap clients into GRUB2. GRUB2 configures IPv6 networking by using DHCPv6 or by assigning a static IPv6 address. This is required because the DHCP server in Red Hat Enterprise Linux (ISC DHCP) does not provide an integration API for managing IPv6 records, therefore the Smart Proxy DHCP plugin that provides DHCP management is limited to IPv4 subnets.
Optional: If you rely on content from IPv4 networks, you must deploy an external IPv4 HTTP proxy server. This is required to access Content Delivery Networks that distribute content only over IPv4 networks, therefore you must use this proxy to pull content into Foreman on your IPv6 network.
You must configure Foreman to use this dual stack (supporting both IPv4 and IPv6) HTTP proxy server as the default proxy. For more information, see Adding a Default HTTP Proxy to Foreman.

3. Installing Foreman server

Use the following procedures to install Foreman server and perform the initial configuration.

Note that the Foreman installation script is based on Puppet, which means that if you run the installation script more than once, it might overwrite any manual configuration changes. ⁠ To avoid this and determine which future changes apply, use the --noop argument when you run the installation script. This argument ensures that no actual changes are made. Potential changes are written to /var/log/foreman-installer/foreman.log.

Files are always backed up and so you can revert any unwanted changes. For example, in the foreman-installer logs, you can see an entry similar to the following about Filebucket:

/Stage[main]/Dhcp/File[/etc/dhcp/dhcpd.conf]: Filebucketed /etc/dhcp/dhcpd.conf to puppet with sum 622d9820b8e764ab124367c68f5fa3a1

You can restore the previous file as follows:

# puppet filebucket -l \
restore /etc/dhcp/dhcpd.conf 622d9820b8e764ab124367c68f5fa3a1

3.1. Configuring repositories

Procedure

Debian 12 (Bookworm)
Ubuntu 22.04 (Jammy)

Install the wget and ca-certificates packages:
```
# apt install wget ca-certificates
```

Change directory to /tmp and retrieve the puppet-release package.

For Puppet 8:

# cd /tmp && wget https://apt.puppet.com/puppet8-release-bookworm.deb

For Puppet 7:

# cd /tmp && wget https://apt.puppet.com/puppet7-release-bookworm.deb

Install the puppet-release package.

For Puppet 8:

# apt install /tmp/puppet8-release-bookworm.deb

For Puppet 7:

# apt install /tmp/puppet7-release-bookworm.deb

Enable the Foreman repository:

# wget https://deb.theforeman.org/foreman.asc -O /etc/apt/trusted.gpg.d/foreman.asc
# echo "deb http://deb.theforeman.org/ bookworm nightly" | sudo tee /etc/apt/sources.list.d/foreman.list
# echo "deb http://deb.theforeman.org/ plugins nightly" | sudo tee -a /etc/apt/sources.list.d/foreman.list

Install the wget and ca-certificates packages:
```
# apt install wget ca-certificates
```

Change directory to /tmp and retrieve the puppet-release package.

For Puppet 8:

# cd /tmp && wget https://apt.puppet.com/puppet8-release-jammy.deb

For Puppet 7:

# cd /tmp && wget https://apt.puppet.com/puppet7-release-jammy.deb

Install the puppet-release package.

For Puppet 8:

# apt install /tmp/puppet8-release-jammy.deb

For Puppet 7:

# apt install /tmp/puppet7-release-jammy.deb

Enable the Foreman repository:

# wget https://deb.theforeman.org/foreman.asc -O /etc/apt/trusted.gpg.d/foreman.asc
# echo "deb http://deb.theforeman.org/ jammy nightly" | sudo tee /etc/apt/sources.list.d/foreman.list
# echo "deb http://deb.theforeman.org/ plugins nightly" | sudo tee -a /etc/apt/sources.list.d/foreman.list

3.2. Installing Foreman server packages

Procedure

Update package lists:
```
# apt update
```
Update all packages:
```
# apt upgrade
```
Install foreman-installer:
```
# apt install foreman-installer
```

3.3. Configuring Foreman server

Install Foreman server by using the foreman-installer installation script.

This method is performed by running the installation script with one or more command options. The command options override the corresponding default initial configuration options and are recorded in the Foreman answer file. You can run the script as often as needed to configure any necessary options.

3.3.1. Configuring Foreman installation

This initial configuration procedure creates an organization, location, user name, and password. After the initial configuration, you can create additional organizations and locations if required. The initial configuration also installs PostgreSQL databases on the same server.

The installation process can take tens of minutes to complete. If you are connecting remotely to the system, use a utility such as tmux that allows suspending and reattaching a communication session so that you can check the installation progress in case you become disconnected from the remote system. If you lose connection to the shell where the installation command is running, see the log at /var/log/foreman-installer/foreman.log to determine if the process completed successfully.

Considerations

Use the foreman-installer --help command to display the most commonly used options and any default values.
Use the foreman-installer --full-help command to display advanced options.
Specify a meaningful value for the option: --foreman-initial-organization. This can be your company name. If you do not specify a value, an organization called Default Organization is created. You can change the organization name later.
By default, all configuration files configured by the installer are managed. When foreman-installer runs, it overwrites any manual changes to the managed files with the intended values. This means that running the installer on a broken system should restore it to working order, regardless of changes made. For more information on how to apply custom configuration on other services, see Applying Custom Configuration to Foreman.
By default, Foreman server is installed with the Puppet agent running as a service. If required, you can disable Puppet agent on Foreman server using the --puppet-runmode=none option.

Procedure

Enter the following command with any additional options that you want to use:

# foreman-installer \
--foreman-initial-organization "My_Organization" \
--foreman-initial-location "My_Location" \
--foreman-initial-admin-username admin_user_name \
--foreman-initial-admin-password admin_password

The script displays its progress and writes logs to /var/log/foreman-installer/foreman.log.

4. Performing additional configuration on Foreman server

4.1. Configuring Foreman for UEFI HTTP boot provisioning in an IPv6 network

Use this procedure to configure Foreman to provision hosts in an IPv6 network with UEFI HTTP Boot provisioning.

Prerequisites

Ensure that your clients can access DHCP and HTTP servers.
Ensure that the UDP ports 67 and 68 are accessible by clients so clients can send DHCP requests and receive DHCP offers.
Ensure that the TCP port 8000 is open for clients to download files and Kickstart templates from Foreman and Smart Proxies.
Ensure that the host provisioning interface subnet has an HTTP Boot Smart Proxy, and Templates Smart Proxy set. For more information, see Adding a Subnet to Foreman server in Provisioning hosts.
In the Foreman web UI, navigate to Administer > Settings > Provisioning and ensure that the Token duration setting is not set to 0. Foreman cannot identify clients that are booting from the network by a remote IPv6 address because of unmanaged DHCPv6 service, therefore provisioning tokens must be enabled.

Procedure

You must disable DHCP management in the installer or not use it.
For all IPv6 subnets created in Foreman, set the DHCP Smart Proxy to blank.
Optional: If the host and the DHCP server are separated by a router, configure the DHCP relay agent and point to the DHCP server.

4.2. Configuring Foreman server with an HTTP proxy

Use the following procedures to configure Foreman with an HTTP proxy.

4.2.1. Adding a default HTTP proxy to Foreman

If your network uses an HTTP Proxy, you can configure Foreman server to use an HTTP proxy for requests to the Red Hat Content Delivery Network (CDN) or another content source. Use the FQDN instead of the IP address where possible to avoid losing connectivity because of network changes.

The following procedure configures a proxy only for downloading content for Foreman. To use the CLI instead of the Foreman web UI, see the CLI procedure.

Procedure

In the Foreman web UI, navigate to Infrastructure > HTTP Proxies.
Click New HTTP Proxy.
In the Name field, enter the name for the HTTP proxy.
In the Url field, enter the URL of the HTTP proxy in the following format: https://http-proxy.example.com:8080.
Optional: If authentication is required, in the Username field, enter the username to authenticate with.
Optional: If authentication is required, in the Password field, enter the password to authenticate with.
To test connection to the proxy, click Test Connection.
Click Submit.
In the Foreman web UI, navigate to Administer > Settings, and click the Content tab.
Set the Default HTTP Proxy setting to the created HTTP proxy.

CLI procedure

Verify that the http_proxy, https_proxy, and no_proxy variables are not set:
```
# unset http_proxy https_proxy no_proxy
```

Add an HTTP proxy entry to Foreman:

$ hammer http-proxy create \
--name=My_HTTP_Proxy \
--username=My_HTTP_Proxy_User_Name \
--password=My_HTTP_Proxy_Password \
--url http://http-proxy.example.com:8080

Configure Foreman to use this HTTP proxy by default:

$ hammer settings set \
--name=content_default_http_proxy \
--value=My_HTTP_Proxy

4.2.2. Using an HTTP proxy for all Foreman HTTP requests

If your Foreman server must remain behind a firewall that blocks HTTP and HTTPS, you can configure a proxy for communication with external systems, including compute resources.

Note that if you are using compute resources for provisioning, and you want to use a different HTTP proxy with the compute resources, the proxy that you set for all Foreman communication takes precedence over the proxies that you set for compute resources.

Procedure

In the Foreman web UI, navigate to Administer > Settings.
In the HTTP(S) proxy row, select the adjacent Value column and enter the proxy URL.
Click the tick icon to save your changes.

CLI procedure

Enter the following command:

$ hammer settings set --name=http_proxy --value=Proxy_URL

4.2.3. Excluding hosts from receiving proxied requests

If you use an HTTP Proxy for all Foreman HTTP or HTTPS requests, you can prevent certain hosts from communicating through the proxy.

Procedure

In the Foreman web UI, navigate to Administer > Settings.
In the HTTP(S) proxy except hosts row, select the adjacent Value column and enter the names of one or more hosts that you want to exclude from proxy requests.
Click the tick icon to save your changes.

CLI procedure

Enter the following command:

$ hammer settings set --name=http_proxy_except_list --value=[hostname1.hostname2...]

4.2.4. Configuring a proxy for PXE file downloads

For Red Hat content served through the Content Delivery Network, Smart Proxy downloads PXE files from synchronized repositories. However, when configuring and installing an operating system using Installation Media, Smart Proxy connects directly using the wget utility.

Procedure

On your TFTP Smart Proxy, verify the ports that are permitted by SELinux for the HTTP cache by entering the following command:
```
# systemctl edit foreman-proxy
```

Configure the HTTP proxy in /etc/systemd/system/foreman-proxy.service.d/overrides.conf:

[Service]
Environment="http_proxy=http://http-proxy.example.com:8080"
Environment="https_proxy=https://http-proxy.example.com:8443"

Restart the foreman-proxy service:
```
# systemctl restart foreman-proxy
```
Create a host or enter build mode for an existing host to re-download PXE files to the TFTP Smart Proxy.

4.2.5. Resetting the HTTP proxy

If you want to reset the current HTTP proxy setting, unset the Default HTTP Proxy setting.

Procedure

In the Foreman web UI, navigate to Administer > Settings, and click the Content tab.
Set the Default HTTP Proxy setting to no global default.

CLI procedure

Set the content_default_http_proxy setting to an empty string:

$ hammer settings set --name=content_default_http_proxy --value=""

4.3. Enabling power management on hosts

To perform power management tasks on hosts using the intelligent platform management interface (IPMI) or a similar protocol, you must enable the baseboard management controller (BMC) module on Foreman server.

Prerequisites

All hosts must have a network interface of BMC type. Foreman server uses this NIC to pass the appropriate credentials to the host. For more information, see Configuring a Baseboard Management Controller (BMC) Interface in Managing hosts.

Procedure

To enable BMC, enter the following command:

# foreman-installer \
--foreman-proxy-bmc "true" \
--foreman-proxy-bmc-default-provider "freeipmi"

4.4. Configuring DNS, DHCP, and TFTP

You can manage DNS, DHCP, and TFTP centrally within the Foreman environment, or you can manage them independently after disabling their maintenance on Foreman.

4.4.1. Configuring DNS, DHCP, and TFTP on Foreman server

To configure the DNS, DHCP, and TFTP services on Foreman server, use the foreman-installer command with the options appropriate for your environment.

Any changes to the settings require entering the foreman-installer command again. You can enter the command multiple times and each time it updates all configuration files with the changed values.

Prerequisites

Ensure that the following information is available to you:
- DHCP IP address ranges
- DHCP gateway IP address
- DHCP nameserver IP address
- DNS information
- TFTP server name
Use the FQDN instead of the IP address where possible in case of network changes.
Contact your network administrator to ensure that you have the correct settings.

Procedure

Enter the foreman-installer command with the options appropriate for your environment. The following example shows configuring full provisioning services:

# foreman-installer \
--foreman-proxy-dns true \
--foreman-proxy-dns-managed true \
--foreman-proxy-dns-zone example.com \
--foreman-proxy-dns-reverse 2.0.192.in-addr.arpa \
--foreman-proxy-dhcp true \
--foreman-proxy-dhcp-managed true \
--foreman-proxy-dhcp-range "192.0.2.100 192.0.2.150" \
--foreman-proxy-dhcp-gateway 192.0.2.1 \
--foreman-proxy-dhcp-nameservers 192.0.2.2 \
--foreman-proxy-tftp true \
--foreman-proxy-tftp-managed true \
--foreman-proxy-tftp-servername 192.0.2.3

You can monitor the progress of the foreman-installer command displayed in your prompt. You can view the logs in /var/log/foreman-installer/foreman.log.

Additional resources

For more information about the foreman-installer command, enter foreman-installer --help.

4.4.2. Disabling DNS, DHCP, and TFTP for unmanaged networks

If you want to manage TFTP, DHCP, and DNS services manually, you must prevent Foreman from maintaining these services on the operating system and disable orchestration to avoid DHCP and DNS validation errors. However, Foreman does not remove the back-end services on the operating system.

Procedure

On Foreman server, enter the following command:

# foreman-installer --foreman-proxy-dhcp false \
--foreman-proxy-dns false \
--foreman-proxy-tftp false

In the Foreman web UI, navigate to Infrastructure > Subnets and select a subnet.
Click the Smart Proxies tab and clear the DHCP Smart Proxy, TFTP Smart Proxy, and Reverse DNS Smart Proxy fields.
In the Foreman web UI, navigate to Infrastructure > Domains and select a domain.
Clear the DNS Smart Proxy field.
Optional: If you use a DHCP service supplied by a third party, configure your DHCP server to pass the following options:
```
Option 66: IP address of Foreman or Smart Proxy
Option 67: /pxelinux.0
```
For more information about DHCP options, see RFC 2132.

Note

Foreman does not perform orchestration when a Smart Proxy is not set for a given subnet and domain. When enabling or disabling Smart Proxy associations, orchestration commands for existing hosts can fail if the expected records and configuration files are not present. When associating a Smart Proxy to turn orchestration on, ensure the required DHCP and DNS records as well as the TFTP files are in place for the existing Foreman hosts in order to prevent host deletion failures in the future.

4.4.3. Additional resources

For more information about configuring DHCP, DNS, and TFTP services, see Configuring Network Services in Provisioning hosts.

4.5. Configuring Foreman server for outgoing emails

To send email messages from Foreman server, you can use either an SMTP server, or the sendmail command.

Prerequisites

Some SMTP servers with anti-spam protection or grey-listing features are known to cause problems. To setup outgoing email with such a service either install and configure a vanilla SMTP service on Foreman server for relay or use the sendmail command instead.

Procedure

In the Foreman web UI, navigate to Administer > Settings.

Click the Email tab and set the configuration options to match your preferred delivery method. The changes have an immediate effect.

The following example shows the configuration options for using an SMTP server:

Table 5. Using an SMTP server as a delivery method
Name	Example value
Delivery method	SMTP
SMTP address	smtp.example.com
SMTP authentication	login
SMTP HELO/EHLO domain	example.com
SMTP password	password
SMTP port	25
SMTP username	user@example.com

The SMTP username and SMTP password specify the login credentials for the SMTP server.

The following example uses gmail.com as an SMTP server:

Table 6. Using gmail.com as an SMTP server
Name	Example value
Delivery method	SMTP
SMTP address	smtp.gmail.com
SMTP authentication	plain
SMTP HELO/EHLO domain	smtp.gmail.com
SMTP enable StartTLS auto	Yes
SMTP password	password
SMTP port	587
SMTP username	user@gmail.com

The following example uses the sendmail command as a delivery method:

Table 7. Using sendmail as a delivery method

Name Example value

Delivery method

Sendmail

Sendmail location

/usr/sbin/sendmail

Sendmail arguments

-i

For security reasons, both Sendmail location and Sendmail argument settings are read-only and can be only set in /etc/foreman/settings.yaml. Both settings currently cannot be set via foreman-installer. This is being tracked in issue #33543. For more information see the sendmail 1 man page.

If you decide to send email using an SMTP server which uses TLS authentication, also perform one of the following steps:
- Mark the CA certificate of the SMTP server as trusted. To do so, execute the following commands on Foreman server:
  # cp mailca.crt /etc/pki/ca-trust/source/anchors/ # update-ca-trust enable # update-ca-trust
  Where mailca.crt is the CA certificate of the SMTP server.
- Alternatively, in the Foreman web UI, set the SMTP enable StartTLS auto option to No.
Click Test email to send a test message to the user’s email address to confirm the configuration is working. If a message fails to send, the Foreman web UI displays an error. See the log at /var/log/foreman/production.log for further details.

Table 7. Using sendmail as a delivery method
Name	Example value
Delivery method	Sendmail
Sendmail location	/usr/sbin/sendmail
Sendmail arguments	-i

Additional resources

For information on configuring email notifications for individual users or user groups, see Configuring Email Notification Preferences in Administering Foreman.

5. Configuring Foreman server with external services

If you do not want to configure the DNS, DHCP, and TFTP services on Foreman server, use this section to configure your Foreman server to work with external DNS, DHCP, and TFTP services.

5.1. Configuring Foreman server with external DNS

You can configure Foreman server with external DNS. Foreman server uses the nsupdate utility to update DNS records on the remote server.

To make any changes persistent, you must enter the foreman-installer command with the options appropriate for your environment.

Prerequisites

You must have a configured external DNS server.
This guide assumes you have an existing installation.

Procedure

Copy the /etc/rndc.key file from the external DNS server to Foreman server:
```
# scp root@dns.example.com:/etc/rndc.key /etc/foreman-proxy/rndc.key
```

Configure the ownership, permissions, and SELinux context:

# chown -v root:foreman-proxy /etc/foreman-proxy/rndc.key
# chmod -v 640 /etc/foreman-proxy/rndc.key

To test the nsupdate utility, add a host remotely:

# echo -e "server DNS_IP_Address\n \
update add aaa.example.com 3600 IN A Host_IP_Address\n \
send\n" | nsupdate -k /etc/foreman-proxy/rndc.key
# nslookup aaa.example.com DNS_IP_Address
# echo -e "server DNS_IP_Address\n \
update delete aaa.example.com 3600 IN A Host_IP_Address\n \
send\n" | nsupdate -k /etc/foreman-proxy/rndc.key

Enter the foreman-installer command to make the following persistent changes to the /etc/foreman-proxy/settings.d/dns.yml file:

# foreman-installer --foreman-proxy-dns=true \
--foreman-proxy-dns-managed=false \
--foreman-proxy-dns-provider=nsupdate \
--foreman-proxy-dns-server="DNS_IP_Address" \
--foreman-proxy-keyfile=/etc/foreman-proxy/rndc.key

In the Foreman web UI, navigate to Infrastructure > Smart Proxies.
Locate the Foreman server and select Refresh from the list in the Actions column.
Associate the DNS service with the appropriate subnets and domain.

5.2. Configuring Foreman server with external DHCP

To configure Foreman server with external DHCP, you must complete the following procedures:

Configuring an external DHCP server to use with Foreman server
Configuring Foreman server with an external DHCP server

5.2.1. Configuring an external DHCP server to use with Foreman server

Note	Note that this procedure describes how to run an external DHCP server on Enterprise Linux 8.

To configure an external DHCP server running Enterprise Linux to use with Foreman server, you must install the ISC DHCP Service and Berkeley Internet Name Domain (BIND) utilities packages. You must also share the DHCP configuration and lease files with Foreman server. The example in this procedure uses the distributed Network File System (NFS) protocol to share the DHCP configuration and lease files.

Note

If you use dnsmasq as an external DHCP server, enable the dhcp-no-override setting. This is required because Foreman creates configuration files on the TFTP server under the grub2/ subdirectory. If the dhcp-no-override setting is disabled, hosts fetch the boot loader and its configuration from the root directory, which might cause an error.

If you do not use firewall-cmd to configure the Linux firewall, implement using the command of your choice.

Procedure

On your Enterprise Linux host, install the ISC DHCP Service and Berkeley Internet Name Domain (BIND) utilities packages:
```
# dnf install dhcp-server bind-utils
```
Generate a security token:
```
# tsig-keygen -a hmac-md5 omapi_key
```

Edit the dhcpd configuration file for all subnets and add the key generated by tsig-keygen. The following is an example:

# cat /etc/dhcp/dhcpd.conf
default-lease-time 604800;
max-lease-time 2592000;
log-facility local7;

subnet 192.168.38.0 netmask 255.255.255.0 {
	range 192.168.38.10 192.168.38.100;
	option routers 192.168.38.1;
	option subnet-mask 255.255.255.0;
	option domain-search "virtual.lan";
	option domain-name "virtual.lan";
	option domain-name-servers 8.8.8.8;
}

omapi-port 7911;
key omapi_key {
	algorithm hmac-md5;
	secret "My_Secret";
};
omapi-key omapi_key;

Note that the option routers value is the IP address of your Foreman server or Smart Proxy server that you want to use with an external DHCP service.

On Foreman server, define each subnet. Do not set DHCP Smart Proxy for the defined Subnet yet.

To prevent conflicts, set up the lease and reservation ranges separately. For example, if the lease range is 192.168.38.10 to 192.168.38.100, in the Foreman web UI define the reservation range as 192.168.38.101 to 192.168.38.250.
Configure the firewall for external access to the DHCP server:
```
# firewall-cmd --add-service dhcp
```
Make the changes persistent:
```
# firewall-cmd --runtime-to-permanent
```
On Foreman server, determine the UID and GID of the foreman user:
```
# id -u foreman
993
# id -g foreman
990
```
On the DHCP server, create the foreman user and group with the same IDs as determined in a previous step:
```
# groupadd -g 990 foreman
# useradd -u 993 -g 990 -s /sbin/nologin foreman
```

To ensure that the configuration files are accessible, restore the read and execute flags:

# chmod o+rx /etc/dhcp/
# chmod o+r /etc/dhcp/dhcpd.conf
# chattr +i /etc/dhcp/ /etc/dhcp/dhcpd.conf

Enable and start the DHCP service:
```
# systemctl enable --now dhcpd
```

Export the DHCP configuration and lease files using NFS:

# dnf install nfs-kernel-server
# systemctl enable --now nfs-server

Create directories for the DHCP configuration and lease files that you want to export using NFS:
```
# mkdir -p /exports/var/lib/dhcpd /exports/etc/dhcp
```

To create mount points for the created directories, add the following line to the /etc/fstab file:

/var/lib/dhcpd /exports/var/lib/dhcpd none bind,auto 0 0
/etc/dhcp /exports/etc/dhcp none bind,auto 0 0

Mount the file systems in /etc/fstab:
```
# mount -a
```

Ensure the following lines are present in /etc/exports:

/exports 192.168.38.1(rw,async,no_root_squash,fsid=0,no_subtree_check)

/exports/etc/dhcp 192.168.38.1(ro,async,no_root_squash,no_subtree_check,nohide)

/exports/var/lib/dhcpd 192.168.38.1(ro,async,no_root_squash,no_subtree_check,nohide)

Note that the IP address that you enter is the Foreman or Smart Proxy IP address that you want to use with an external DHCP service.

Reload the NFS server:
```
# exportfs -rva
```
Configure the firewall for DHCP omapi port 7911:
```
# firewall-cmd --add-port=7911/tcp
```

Optional: Configure the firewall for external access to NFS. Clients are configured using NFSv3.

# firewall-cmd \
--add-service mountd \
--add-service nfs \
--add-service rpc-bind \
--zone public

Make the changes persistent:
```
# firewall-cmd --runtime-to-permanent
```

5.2.2. Configuring Foreman server with an external DHCP server

You can configure Foreman server with an external DHCP server.

Prerequisites

Ensure that you have configured an external DHCP server and that you have shared the DHCP configuration and lease files with Foreman server. For more information, see Configuring an external DHCP server to use with Foreman server.

Procedure

Install the nfs-common package:
```
# apt install nfs-common
```

Create the DHCP directories for NFS:

# mkdir -p /mnt/nfs/etc/dhcp /mnt/nfs/var/lib/dhcpd

Change the file owner:
```
# chown -R foreman-proxy /mnt/nfs
```
Verify communication with the NFS server and the Remote Procedure Call (RPC) communication paths:
```
# showmount -e DHCP_Server_FQDN
# rpcinfo -p DHCP_Server_FQDN
```

Add the following lines to the /etc/fstab file:

DHCP_Server_FQDN:/exports/etc/dhcp /mnt/nfs/etc/dhcp nfs
ro,vers=3,auto,nosharecache,context="system_u:object_r:dhcp_etc_t:s0" 0 0

DHCP_Server_FQDN:/exports/var/lib/dhcpd /mnt/nfs/var/lib/dhcpd nfs
ro,vers=3,auto,nosharecache,context="system_u:object_r:dhcpd_state_t:s0" 0 0

Mount the file systems on /etc/fstab:
```
# mount -a
```
To verify that the foreman-proxy user can access the files that are shared over the network, display the DHCP configuration and lease files:
```
# su foreman-proxy -s /bin/bash
$ cat /mnt/nfs/etc/dhcp/dhcpd.conf
$ cat /mnt/nfs/var/lib/dhcpd/dhcpd.leases
$ exit
```

Enter the foreman-installer command to make the following persistent changes to the /etc/foreman-proxy/settings.d/dhcp.yml file:

# foreman-installer \
--enable-foreman-proxy-plugin-dhcp-remote-isc \
--foreman-proxy-dhcp-provider=remote_isc \
--foreman-proxy-dhcp-server=My_DHCP_Server_FQDN \
--foreman-proxy-dhcp=true \
--foreman-proxy-plugin-dhcp-remote-isc-dhcp-config /mnt/nfs/etc/dhcp/dhcpd.conf \
--foreman-proxy-plugin-dhcp-remote-isc-dhcp-leases /mnt/nfs/var/lib/dhcpd/dhcpd.leases \
--foreman-proxy-plugin-dhcp-remote-isc-key-name=omapi_key \
--foreman-proxy-plugin-dhcp-remote-isc-key-secret=My_Secret \
--foreman-proxy-plugin-dhcp-remote-isc-omapi-port=7911

Associate the DHCP service with the appropriate subnets and domain.

5.3. Using Infoblox as DHCP and DNS providers

You can use Foreman server to connect to your Infoblox application to create and manage DHCP and DNS records, and to reserve IP addresses.

The supported Infoblox version is NIOS 8.0 or higher.

5.3.1. Infoblox limitations

All DHCP and DNS records can be managed only in a single Network or DNS view. After you install the Infoblox modules on Foreman server and set up the view using the foreman-installer command, you cannot edit the view.

Foreman server communicates with a single Infoblox node by using the standard HTTPS web API. If you want to configure clustering and High Availability, make the configurations in Infoblox.

Hosting PXE-related files by using the TFTP functionality of Infoblox is not supported. You must use Foreman server as a TFTP server for PXE provisioning. For more information, see Configuring networking in Provisioning hosts.

Foreman IPAM feature cannot be integrated with Infoblox.

5.3.2. Infoblox prerequisites

You must have Infoblox account credentials to manage DHCP and DNS entries in Foreman.
Ensure that you have Infoblox administration roles with the names: DHCP Admin and DNS Admin.
The administration roles must have permissions or belong to an admin group that permits the accounts to perform tasks through the Infoblox API.

5.3.3. Installing the Infoblox CA certificate

You must install Infoblox HTTPS CA certificate on the base system of Foreman server.

Procedure

Download the certificate from the Infoblox web UI or you use the following OpenSSL commands to download the certificate:
```
# update-ca-trust enable
# openssl s_client -showcerts -connect infoblox.example.com:443 </dev/null | \
openssl x509 -text >/etc/pki/ca-trust/source/anchors/infoblox.crt
# update-ca-trust extract
```
The infoblox.example.com entry must match the host name for the Infoblox application in the X509 certificate.

Verification

Test the CA certificate by using a curl query:

# curl -u admin:password https://infoblox.example.com/wapi/v2.0/network

Example positive response:

[
    {
        "_ref": "network/ZG5zLm5ldHdvcmskMTkyLjE2OC4yMDIuMC8yNC8w:infoblox.example.com/24/default",
        "network": "192.168.202.0/24",
        "network_view": "default"
    }
]

5.3.4. Installing the DHCP Infoblox module

Install the DHCP Infoblox module on Foreman server. Note that you cannot manage records in separate views.

You can also install DHCP and DNS Infoblox modules simultaneously by combining this procedure and Installing the DNS Infoblox module.

DHCP Infoblox record type considerations

If you want to use the DHCP and DNS Infoblox modules together, configure the DHCP Infoblox module with the fixedaddress record type only. The host record type causes DNS conflicts and is not supported.

If you configure the DHCP Infoblox module with the host record type, you have to unset both DNS Smart Proxy and Reverse DNS Smart Proxy options on your Infoblox-managed subnets, because Infoblox does DNS management by itself. Using the host record type leads to creating conflicts and being unable to rename hosts in Foreman.

Procedure

On Foreman server, enter the following command:

# foreman-installer --enable-foreman-proxy-plugin-dhcp-infoblox \
--foreman-proxy-dhcp true \
--foreman-proxy-dhcp-provider infoblox \
--foreman-proxy-dhcp-server infoblox.example.com \
--foreman-proxy-plugin-dhcp-infoblox-username admin \
--foreman-proxy-plugin-dhcp-infoblox-password infoblox \
--foreman-proxy-plugin-dhcp-infoblox-record-type fixedaddress \
--foreman-proxy-plugin-dhcp-infoblox-dns-view default \
--foreman-proxy-plugin-dhcp-infoblox-network-view default

Optional: In the Foreman web UI, navigate to Infrastructure > Smart Proxies, select the Smart Proxy with the DHCP Infoblox module, and ensure that the dhcp feature is listed.
In the Foreman web UI, navigate to Infrastructure > Subnets.
For all subnets managed through Infoblox, ensure that the IP address management (IPAM) method of the subnet is set to DHCP.

5.3.5. Installing the DNS Infoblox module

Install the DNS Infoblox module on Foreman server. You can also install DHCP and DNS Infoblox modules simultaneously by combining this procedure and Installing the DHCP Infoblox module.

Procedure

On Foreman server, enter the following command to configure the Infoblox module:

# foreman-installer --enable-foreman-proxy-plugin-dns-infoblox \
--foreman-proxy-dns true \
--foreman-proxy-dns-provider infoblox \
--foreman-proxy-plugin-dns-infoblox-dns-server infoblox.example.com \
--foreman-proxy-plugin-dns-infoblox-username admin \
--foreman-proxy-plugin-dns-infoblox-password infoblox \
--foreman-proxy-plugin-dns-infoblox-dns-view default

Optionally, you can change the value of the --foreman-proxy-plugin-dns-infoblox-dns-view option to specify an Infoblox DNS view other than the default view.

Optional: In the Foreman web UI, navigate to Infrastructure > Smart Proxies, select the Smart Proxy with the Infoblox DNS module, and ensure that the dns feature is listed.
In the Foreman web UI, navigate to Infrastructure > Domains.
For all domains managed through Infoblox, ensure that the DNS Proxy is set for those domains.
In the Foreman web UI, navigate to Infrastructure > Subnets.
For all subnets managed through Infoblox, ensure that the DNS Smart Proxy and Reverse DNS Smart Proxy are set for those subnets.

5.4. Configuring Foreman server with external TFTP

You can configure Foreman server with external TFTP services.

Procedure

Create the TFTP directory for NFS:
```
# mkdir -p /mnt/nfs/var/lib/tftpboot
```

In the /etc/fstab file, add the following line:

TFTP_Server_IP_Address:/exports/var/lib/tftpboot /mnt/nfs/var/lib/tftpboot nfs rw,vers=3,auto,nosharecache,context="system_u:object_r:tftpdir_rw_t:s0" 0 0

Mount the file systems in /etc/fstab:
```
# mount -a
```
Enter the foreman-installer command to make the following persistent changes to the /etc/foreman-proxy/settings.d/tftp.yml file:
```
# foreman-installer \
--foreman-proxy-tftp-root /mnt/nfs/var/lib/tftpboot \
--foreman-proxy-tftp=true
```
If the TFTP service is running on a different server than the DHCP service, update the tftp_servername setting with the FQDN or IP address of the server that the TFTP service is running on:
```
# foreman-installer --foreman-proxy-tftp-servername=TFTP_Server_FQDN
```
In the Foreman web UI, navigate to Infrastructure > Smart Proxies.
Locate the Foreman server and select Refresh from the list in the Actions column.
Associate the TFTP service with the appropriate subnets and domain.

5.5. Configuring Foreman server with external IdM DNS

When Foreman server adds a DNS record for a host, it first determines which Smart Proxy is providing DNS for that domain. It then communicates with the Smart Proxy that is configured to provide DNS service for your deployment and adds the record. The hosts are not involved in this process. Therefore, you must install and configure the IdM client on the Foreman or Smart Proxy that is currently configured to provide a DNS service for the domain you want to manage by using the IdM server.

Foreman server can be configured to use a Red Hat Identity Management (IdM) server to provide DNS service.

To configure Foreman server to use a Red Hat Identity Management (IdM) server to provide DNS service, use one of the following procedures:

Configuring dynamic DNS update with GSS-TSIG authentication
Configuring dynamic DNS update with TSIG authentication

To revert to internal DNS service, use the following procedure:

Reverting to internal DNS service

Note

You are not required to use Foreman server to manage DNS. When you are using the realm enrollment feature of Foreman, where provisioned hosts are enrolled automatically to IdM, the ipa-client-install script creates DNS records for the client. Configuring Foreman server with external IdM DNS and realm enrollment are mutually exclusive. For more information about configuring realm enrollment, see Configuring Foreman to manage the lifecycle of a host registered to a FreeIPA realm.

5.5.1. Configuring dynamic DNS update with GSS-TSIG authentication

You can configure the IdM server to use the generic security service algorithm for secret key transaction (GSS-TSIG) technology defined in RFC3645. To configure the IdM server to use the GSS-TSIG technology, you must install the IdM client on the Foreman server base operating system.

Prerequisites

You must ensure the IdM server is deployed and the host-based firewall is configured correctly.
You must contact the IdM server administrator to ensure that you obtain an account on the IdM server with permissions to create zones on the IdM server.
You should create a backup of the answer file. You can use the backup to restore the answer file to its original state if it becomes corrupted. For more information, see Configuring Foreman server.

Procedure

To configure dynamic DNS update with GSS-TSIG authentication, complete the following steps:

Creating a Kerberos principal on the IdM server

Obtain a Kerberos ticket for the account obtained from the IdM administrator:
```
# kinit idm_user
```
Create a new Kerberos principal for Foreman server to use to authenticate on the IdM server:
```
# ipa service-add smartproxy/foreman.example.com
```

Installing and configuring the idM client

On the base operating system of either the Foreman or Smart Proxy that is managing the DNS service for your deployment, install the ipa-client package:
```
# apt install ipa-client
```
Configure the IdM client by running the installation script and following the on-screen prompts:
```
# ipa-client-install
```
Obtain a Kerberos ticket:
```
# kinit admin
```
Remove any preexisting keytab:
```
# rm /etc/foreman-proxy/dns.keytab
```

Obtain the keytab for this system:

# ipa-getkeytab -p smartproxy/foreman.example.com@EXAMPLE.COM \
-s idm1.example.com -k /etc/foreman-proxy/dns.keytab

Note	When adding a keytab to a standby system with the same host name as the original system in service, add the `r` option to prevent generating new credentials and rendering the credentials on the original system invalid.

For the dns.keytab file, set the group and owner to foreman-proxy:

# chown foreman-proxy:foreman-proxy /etc/foreman-proxy/dns.keytab

Optional: To verify that the keytab file is valid, enter the following command:

# kinit -kt /etc/foreman-proxy/dns.keytab \
smartproxy/foreman.example.com@EXAMPLE.COM

Configuring DNS zones in the IdM web UI

Create and configure the zone that you want to manage:
1. Navigate to Network Services > DNS > DNS Zones.
2. Select Add and enter the zone name. For example, example.com.
3. Click Add and Edit.
4. Click the Settings tab and in the BIND update policy box, add the following to the semi-colon separated list:
  grant smartproxy\047foreman.example.com@EXAMPLE.COM wildcard * ANY;
5. Set Dynamic update to True.
6. Enable Allow PTR sync.
7. Click Save to save the changes.
Create and configure the reverse zone:
1. Navigate to Network Services > DNS > DNS Zones.
2. Click Add.
3. Select Reverse zone IP network and add the network address in CIDR format to enable reverse lookups.
4. Click Add and Edit.
5. Click the Settings tab and in the BIND update policy box, add the following to the semi-colon separated list:
  grant smartproxy\047foreman.example.com@EXAMPLE.COM wildcard * ANY;
6. Set Dynamic update to True.
7. Click Save to save the changes.

Configuring the Foreman or Smart Proxy server that manages the DNS service for the domain

Configure your Foreman server or Smart Proxy server to connect to your DNS service:

# foreman-installer \
--foreman-proxy-dns-managed=false \
--foreman-proxy-dns-provider=nsupdate_gss \
--foreman-proxy-dns-server="idm1.example.com" \
--foreman-proxy-dns-tsig-keytab=/etc/foreman-proxy/dns.keytab \
--foreman-proxy-dns-tsig-principal="smartproxy/foreman.example.com@EXAMPLE.COM" \
--foreman-proxy-dns=true

For each affected Smart Proxy, update the configuration of that Smart Proxy in the Foreman web UI:
1. In the Foreman web UI, navigate to Infrastructure > Smart Proxies, locate the Foreman server, and from the list in the Actions column, select Refresh.
2. Configure the domain:
  1. In the Foreman web UI, navigate to Infrastructure > Domains and select the domain name.
  2. In the Domain tab, ensure DNS Smart Proxy is set to the Smart Proxy where the subnet is connected.
3. Configure the subnet:
  1. In the Foreman web UI, navigate to Infrastructure > Subnets and select the subnet name.
  2. In the Subnet tab, set IPAM to None.
  3. In the Domains tab, select the domain that you want to manage using the IdM server.
  4. In the Smart Proxies tab, ensure Reverse DNS Smart Proxy is set to the Smart Proxy where the subnet is connected.
  5. Click Submit to save the changes.

5.5.2. Configuring dynamic DNS update with TSIG authentication

You can configure an IdM server to use the secret key transaction authentication for DNS (TSIG) technology that uses the rndc.key key file for authentication. The TSIG protocol is defined in RFC2845.

Prerequisites

You must ensure the IdM server is deployed and the host-based firewall is configured correctly.
You must obtain root user access on the IdM server.
You must confirm whether Foreman server or Smart Proxy server is configured to provide DNS service for your deployment.
You must configure DNS, DHCP and TFTP services on the base operating system of either the Foreman or Smart Proxy that is managing the DNS service for your deployment.
You must create a backup of the answer file. You can use the backup to restore the answer file to its original state if it becomes corrupted. For more information, see Configuring Foreman server.

Procedure

To configure dynamic DNS update with TSIG authentication, complete the following steps:

Enabling external updates to the DNS zone in the IdM server

On the IdM Server, add the following to the top of the /etc/named.conf file:

########################################################################

include "/etc/rndc.key";
controls  {
inet _IdM_Server_IP_Address_ port 953 allow { _Foreman_IP_Address_; } keys { "rndc-key"; };
};
########################################################################

Reload the named service to make the changes take effect:
```
# systemctl reload named
```
In the IdM web UI, navigate to Network Services > DNS > DNS Zones and click the name of the zone. In the Settings tab, apply the following changes:
1. Add the following in the BIND update policy box:
  grant "rndc-key" zonesub ANY;
2. Set Dynamic update to True.
3. Click Update to save the changes.
Copy the /etc/rndc.key file from the IdM server to the base operating system of your Foreman server. Enter the following command:
```
# scp /etc/rndc.key root@foreman.example.com:/etc/rndc.key
```
To set the correct ownership, permissions, and SELinux context for the rndc.key file, enter the following command:
```
# restorecon -v /etc/rndc.key
# chown -v root:named /etc/rndc.key
# chmod -v 640 /etc/rndc.key
```
Assign the foreman-proxy user to the named group manually. Normally, foreman-installer ensures that the foreman-proxy user belongs to the named UNIX group, however, in this scenario Foreman does not manage users and groups, therefore you need to assign the foreman-proxy user to the named group manually.
```
# usermod -a -G named foreman-proxy
```

On Foreman server, enter the following foreman-installer command to configure Foreman to use the external DNS server:

# foreman-installer \
--foreman-proxy-dns-managed=false \
--foreman-proxy-dns-provider=nsupdate \
--foreman-proxy-dns-server="IdM_Server_IP_Address" \
--foreman-proxy-dns-ttl=86400 \
--foreman-proxy-dns=true \
--foreman-proxy-keyfile=/etc/rndc.key

Testing external updates to the DNS zone in the IdM server

Ensure that the key in the /etc/rndc.key file on Foreman server is the same key file that is used on the IdM server:
```
key "rndc-key" {
        algorithm hmac-md5;
        secret "secret-key==";
};
```
On Foreman server, create a test DNS entry for a host. For example, host test.example.com with an A record of 192.168.25.20 on the IdM server at 192.168.25.1.
```
# echo -e "server 192.168.25.1\n \
update add test.example.com 3600 IN A 192.168.25.20\n \
send\n" | nsupdate -k /etc/rndc.key
```

On Foreman server, test the DNS entry:

# nslookup test.example.com 192.168.25.1

Example output:

Server:		192.168.25.1
Address:	192.168.25.1#53

Name:	test.example.com
Address: 192.168.25.20

To view the entry in the IdM web UI, navigate to Network Services > DNS > DNS Zones. Click the name of the zone and search for the host by name.

If resolved successfully, remove the test DNS entry:

# echo -e "server 192.168.25.1\n \
update delete test.example.com 3600 IN A 192.168.25.20\n \
send\n" | nsupdate -k /etc/rndc.key

Confirm that the DNS entry was removed:
```
# nslookup test.example.com 192.168.25.1
```
The above nslookup command fails and returns the SERVFAIL error message if the record was successfully deleted.

5.5.3. Reverting to internal DNS service

You can revert to using Foreman server and Smart Proxy server as your DNS providers. You can use a backup of the answer file that was created before configuring external DNS, or you can create a backup of the answer file. For more information about answer files, see Configuring Foreman server.

Procedure

On the Foreman or Smart Proxy server that you want to configure to manage DNS service for the domain, complete the following steps:

Configuring Foreman or Smart Proxy as a DNS server

If you have created a backup of the answer file before configuring external DNS, restore the answer file and then enter the foreman-installer command:
```
# foreman-installer
```
If you do not have a suitable backup of the answer file, create a backup of the answer file now. To configure Foreman or Smart Proxy as DNS server without using an answer file, enter the following foreman-installer command on Foreman or Smart Proxy:
```
# foreman-installer \
--foreman-proxy-dns-managed=true \
--foreman-proxy-dns-provider=nsupdate \
--foreman-proxy-dns-server="127.0.0.1" \
--foreman-proxy-dns=true
```
For more information, see Configuring DNS, DHCP, and TFTP on Smart Proxy server.

After you run the foreman-installer command to make any changes to your Smart Proxy configuration, you must update the configuration of each affected Smart Proxy in the Foreman web UI.

Updating the configuration in the Foreman web UI

In the Foreman web UI, navigate to Infrastructure > Smart Proxies.
For each Smart Proxy that you want to update, from the Actions list, select Refresh.
Configure the domain:
1. In the Foreman web UI, navigate to Infrastructure > Domains and click the domain name that you want to configure.
2. In the Domain tab, set DNS Smart Proxy to the Smart Proxy where the subnet is connected.
Configure the subnet:
1. In the Foreman web UI, navigate to Infrastructure > Subnets and select the subnet name.
2. In the Subnet tab, set IPAM to DHCP or Internal DB.
3. In the Domains tab, select the domain that you want to manage using Foreman or Smart Proxy.
4. In the Smart Proxies tab, set Reverse DNS Smart Proxy to the Smart Proxy where the subnet is connected.
5. Click Submit to save the changes.

5.6. Configuring Foreman to manage the lifecycle of a host registered to a FreeIPA realm

As well as providing access to Foreman server, hosts provisioned with Foreman can also be integrated with FreeIPA realms. Foreman has a realm feature that automatically manages the lifecycle of any system registered to a realm or domain provider.

Use this section to configure Foreman server or Smart Proxy server for FreeIPA realm support, then add hosts to the FreeIPA realm group.

Prerequisites

Foreman server that is registered to the Content Delivery Network or an external Smart Proxy server that is registered to Foreman server.
A deployed realm or domain provider such as FreeIPA.

To install and configure FreeIPA packages on Foreman server or Smart Proxy server:

To use FreeIPA for provisioned hosts, complete the following steps to install and configure FreeIPA packages on Foreman server or Smart Proxy server:

Install the ipa-client package on Foreman server or Smart Proxy server:
```
# apt install ipa-client
```
Configure the server as a FreeIPA client:
```
# ipa-client-install
```
Create a realm proxy user, realm-smart-proxy, and the relevant roles in FreeIPA:
```
# foreman-prepare-realm admin realm-smart-proxy
```
Note the principal name that returns and your FreeIPA server configuration details because you require them for the following procedure.

To configure Foreman server or Smart Proxy server for FreeIPA realm support:

Complete the following procedure on Foreman and every Smart Proxy that you want to use:

Copy the /root/freeipa.keytab file to any Smart Proxy server that you want to include in the same principal and realm:
```
# scp /root/freeipa.keytab root@smartproxy.example.com:/etc/foreman-proxy/freeipa.keytab
```
Move the /root/freeipa.keytab file to the /etc/foreman-proxy directory and set the ownership settings to the foreman-proxy user:
```
# mv /root/freeipa.keytab /etc/foreman-proxy
# chown foreman-proxy:foreman-proxy /etc/foreman-proxy/freeipa.keytab
```
Enter the following command on all Smart Proxies that you want to include in the realm. If you use the integrated Smart Proxy on Foreman, enter this command on Foreman server:
```
# foreman-installer --foreman-proxy-realm true \
--foreman-proxy-realm-keytab /etc/foreman-proxy/freeipa.keytab \
--foreman-proxy-realm-principal realm-smart-proxy@EXAMPLE.COM \
--foreman-proxy-realm-provider freeipa
```
You can also use these options when you first configure the Foreman server.
Ensure that the most updated versions of the ca-certificates package is installed and trust the FreeIPA Certificate Authority:
```
# cp /etc/ipa/ca.crt /etc/pki/ca-trust/source/anchors/ipa.crt
# update-ca-trust enable
# update-ca-trust
```
Optional: If you configure FreeIPA on an existing Foreman server or Smart Proxy server, complete the following steps to ensure that the configuration changes take effect:
1. Restart the foreman-proxy service:
  # systemctl restart foreman-proxy
2. In the Foreman web UI, navigate to Infrastructure > Smart Proxies.
3. Locate the Smart Proxy you have configured for FreeIPA and from the list in the Actions column, select Refresh.

To create a realm for the FreeIPA-enabled Smart Proxy

After you configure your integrated or external Smart Proxy with FreeIPA, you must create a realm and add the FreeIPA-configured Smart Proxy to the realm.

Procedure

In the Foreman web UI, navigate to Infrastructure > Realms and click Create Realm.
In the Name field, enter a name for the realm.
From the Realm Type list, select the type of realm.
From the Realm Smart Proxy list, select Smart Proxy server where you have configured FreeIPA.
Click the Locations tab and from the Locations list, select the location where you want to add the new realm.
Click the Organizations tab and from the Organizations list, select the organization where you want to add the new realm.
Click Submit.

Updating host groups with realm information

You must update any host groups that you want to use with the new realm information.

In the Foreman web UI, navigate to Configure > Host Groups, select the host group that you want to update, and click the Network tab.
From the Realm list, select the realm you create as part of this procedure, and then click Submit.

Adding hosts to a FreeIPA host group

FreeIPA supports the ability to set up automatic membership rules based on a system’s attributes. Foreman’s realm feature provides administrators with the ability to map the Foreman host groups to the FreeIPA parameter userclass which allow administrators to configure automembership.

When nested host groups are used, they are sent to the FreeIPA server as they are displayed in the Foreman User Interface. For example, "Parent/Child/Child".

Foreman server or Smart Proxy server sends updates to the FreeIPA server, however automembership rules are only applied at initial registration.

To add hosts to a FreeIPA host group:

On the FreeIPA server, create a host group:

# ipa hostgroup-add hostgroup_name --desc=hostgroup_description

Create an automembership rule:
```
# ipa automember-add --type=hostgroup hostgroup_name automember_rule
```
Where you can use the following options:
- automember-add flags the group as an automember group.
- --type=hostgroup identifies that the target group is a host group, not a user group.
- automember_rule adds the name you want to identify the automember rule by.
Define an automembership condition based on the userclass attribute:
```
# ipa automember-add-condition --key=userclass --type=hostgroup --inclusive-regex=^webserver hostgroup_name
----------------------------------
Added condition(s) to "hostgroup_name"
----------------------------------
Automember Rule: automember_rule
Inclusive Regex: userclass=^webserver
----------------------------
Number of conditions added 1
----------------------------
```
Where you can use the following options:
- automember-add-condition adds regular expression conditions to identify group members.
- --key=userclass specifies the key attribute as userclass.
- --type=hostgroup identifies that the target group is a host group, not a user group.
- --inclusive-regex= ^webserver identifies matching values with a regular expression pattern.
- hostgroup_name – identifies the target host group’s name.

When a system is added to Foreman server’s hostgroup_name host group, it is added automatically to the FreeIPA server’s "hostgroup_name" host group. FreeIPA host groups allow for Host-Based Access Controls (HBAC), sudo policies and other FreeIPA functions.

Appendix A: Applying custom configuration to Foreman

When you install and configure Foreman for the first time by using foreman-installer, you can specify that the DNS and DHCP configuration files are not to be managed by Puppet by using the installer flags --foreman-proxy-dns-managed=false and --foreman-proxy-dhcp-managed=false. If these flags are not specified during the initial installer run, rerunning of the installer overwrites all manual changes, for example, rerun for upgrade purposes. If changes are overwritten, you must run the restore procedure to restore the manual changes. For more information, see Restoring Manual Changes Overwritten by a Puppet Run.

To view all installer flags available for custom configuration, run foreman-installer --full-help. Some Puppet classes are not exposed to the Foreman installer. To manage them manually and prevent the installer from overwriting their values, specify the configuration values by adding entries to configuration file /etc/foreman-installer/custom-hiera.yaml. This configuration file is in YAML format, consisting of one entry per line in the format of <puppet class>::<parameter name>: <value>. Configuration values specified in this file persist across installer reruns.

Common examples include:

For Apache, to set the ServerTokens directive to return only the product name:
```
apache::server_tokens: Prod
```
To turn off the Apache server signature entirely:
```
apache::server_signature: Off
```

The Puppet modules for the Foreman installer are stored under /usr/share/foreman-installer/modules. Check the .pp files (for example: moduleName/manifests/example.pp) to look up the classes, parameters, and values. Alternatively, use the grep command to do keyword searches.

Setting some values may have unintended consequences that affect the performance or functionality of Foreman. Consider the impact of the changes before you apply them, and test the changes in a non-production environment first. If you do not have a non-production Foreman environment, run the Foreman installer with the --noop and --verbose options. If your changes cause problems, remove the offending lines from custom-hiera.yaml and rerun the Foreman installer. If you have any specific questions about whether a particular value is safe to alter, contact Red Hat support.

Appendix B: Restoring manual changes overwritten by a Puppet run

If your manual configuration has been overwritten by a Puppet run, you can restore the files to the previous state. The following example shows you how to restore a DHCP configuration file overwritten by a Puppet run.

Procedure

Copy the file you intend to restore. This allows you to compare the files to check for any mandatory changes required by the upgrade. This is not common for DNS or DHCP services.
```
# cp /etc/dhcp/dhcpd.conf /etc/dhcp/dhcpd.backup
```

Check the log files to note down the md5sum of the overwritten file. For example:

# journalctl -xe
...
/Stage[main]/Dhcp/File[/etc/dhcp/dhcpd.conf]: Filebucketed /etc/dhcp/dhcpd.conf to puppet with sum 622d9820b8e764ab124367c68f5fa3a1
...

Restore the overwritten file:

# puppet filebucket restore --local --bucket \
/var/lib/puppet/clientbucket /etc/dhcp/dhcpd.conf \ 622d9820b8e764ab124367c68f5fa3a1

Compare the backup file and the restored file, and edit the restored file to include any mandatory changes required by the upgrade.