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Chapter 2. Installing RHEL image builder
Before using RHEL image builder, you must install it.
2.1. RHEL image builder system requirements
The host that runs RHEL image builder must meet the following requirements:
| Parameter | Minimal Required Value |
|---|---|
| System type | A dedicated host or virtual machine. Note that RHEL image builder is not supported in containers, including Red Hat Universal Base Images (UBI). |
| Processor | 2 cores |
| Memory | 4 GiB |
| Disk space | 20 GiB of free space in the ` /var/cache/` filesystem |
| Access privileges | root |
| Network | Internet connectivity to the Red Hat Content Delivery Network (CDN). |
If you do not have internet connectivity, use RHEL image builder in isolated networks. For that, you must override the default repositories to point to your local repositories to not connect to Red Hat Content Delivery Network (CDN). Ensure that you have your content mirrored internally or use Red Hat Satellite.
2.2. Installing RHEL image builder
Install RHEL image builder to have access to all the osbuild-composer package functionalities.
Prerequisites
- You are logged in to the RHEL host on which you want to install RHEL image builder.
- The host is subscribed to Red Hat Subscription Manager (RHSM) or Red Hat Satellite.
-
You have enabled the
BaseOSandAppStreamrepositories to be able to install the RHEL image builder packages.
Procedure
Install RHEL image builder and other necessary packages:
# dnf install osbuild-composer composer-cli cockpit-composer
-
osbuild-composer- A service to build customized RHEL operating system images. -
composer-cli- This package enables access to the CLI interface. -
cockpit-composer- This package enables access to the Web UI interface. The web console is installed as a dependency of thecockpit-composerpackage.
-
Enable and start RHEL image builder socket:
# systemctl enable --now osbuild-composer.socket
If you want to use RHEL image builder in the web console, enable and start it.
# systemctl enable --now cockpit.socket
The
osbuild-composerandcockpitservices start automatically on first access.Load the shell configuration script so that the autocomplete feature for the
composer-clicommand starts working immediately without logging out and in:$ source /etc/bash_completion.d/composer-cli
Verification
Verify that the installation works by running
composer-cli:# composer-cli status show
Troubleshooting
You can use a system journal to track RHEL image builder activities. Additionally, you can find the log messages in the file.
To find the journal output for traceback, run the following commands:
$ journalctl | grep osbuild
To show the local worker, such as the
osbuild-worker@.service, a template service that can start multiple service instances:$ journalctl -u osbuild-worker*
To show the running services:
$ journalctl -u osbuild-composer.service
