Red Hat Training

A Red Hat training course is available for RHEL 8

3.2. Creating an Image Builder blueprint with command-line interface

This procedure describes how to create a new Image Builder blueprint using the command-line interface.

Procedure

  1. Create a plain text file with the following contents:

    name = "BLUEPRINT-NAME"
    description = "LONG FORM DESCRIPTION TEXT"
    version = "0.0.1"
    modules = []
    groups = []

    Replace BLUEPRINT-NAME and LONG FORM DESCRIPTION TEXT with a name and description for your blueprint.

    Replace 0.0.1 with a version number according to the Semantic Versioning scheme.

  2. For every package that you want to be included in the blueprint, add the following lines to the file:

    [[packages]]
    name = "package-name"
    version = "package-version"

    Replace package-name with name of the package, such as httpd, gdb-doc, or coreutils.

    Replace package-version with a version to use. This field supports dnf version specifications:

    • For a specific version, use the exact version number such as 8.30.
    • For latest available version, use the asterisk *.
    • For a latest minor version, use format such as 8.*.
  3. Blueprints can be customized in a number of ways. For this example, Simultaneous Multi Threading (SMT) can be disabled by performing the steps below. For additional customizations available, please see Supported Image Customizations.

    [customizations.kernel]
    append = "nosmt=force"
  4. Save the file as BLUEPRINT-NAME.toml and close the text editor.
  5. Push (import) the blueprint:

    # composer-cli blueprints push BLUEPRINT-NAME.toml

    Replace BLUEPRINT-NAME with the value you used in previous steps.

  6. To verify that the blueprint has been pushed and exists, list the existing blueprints:

    # composer-cli blueprints list
  7. Check whether the components and versions listed in the blueprint and their dependencies are valid:

    # composer-cli blueprints depsolve BLUEPRINT-NAME
Nota

You are able to create images using the composer-cli command as non-root. To do so, add your user to the weldr or root groups. To add your user to the weldr group, perform the following steps:

# usermod -a -G weldr user
$ newgrp weldr