ced54fea75
While building cloud images, it is common to set modules for CentOS and RHEL images. Earlier it was part of rhel-common which was specific to RHEL OS not for CentOS. Moving it under yum element as module/stream can be enabled or disabled via dnf itself. Signed-off-by: Chandan Kumar (raukadah) <chkumar@redhat.com> Change-Id: Idc0f277f97e92e4d003f059f01b59f1b5513da34
yum
Provide yum specific image building glue.
RHEL/Fedora/CentOS and other yum based distributions need specific yum customizations.
Customizations include caching of downloaded yum packages outside of the build chroot so that they can be reused by subsequent image builds. The cache increases image building speed when building multiple images, especially on slow connections. This is more effective than using an HTTP proxy as a yum cache since the same rpm from different mirrors is often requested.
Custom yum repository configurations can also be applied by defining DIB_YUM_REPO_CONF to a space separated list of repo configuration files. The files will be copied to /etc/yum.repos.d/ during the image build, and then removed at the end of the build. Each repo file should be named differently to avoid a filename collision.
Environment Variables for Module Selection during Image Creation
The following environment variable is used to select module streams to be enabled during an image build on RHEL8. Any existing stream for the given module is first disabled prior to enabling the specified stream.
#### DIB_DNF_MODULE_STREAMS This is a space-separated list of module streams to enable prior to any RPMs being installed.
Image Build Module Selection Example
When using Train on RHEL8.2, one must select the appropriate virt and container-tools module streams:
DIB_DNF_MODULE_STREAMS='virt:8.2 container-tools:3.0'