AlmaLinux Docker Images

This project contains sources and tools for building Official AlmaLinux Docker images.

Build Requirements

Docker images are created using AlmaLinux rootfs images. These images can be created from customized kickstart sources.

Using an AlmaLinux system

You need an AlmaLinux system with following RPM packages installed to run the build.sh script to create rootfs file.

anaconda-tui
lorax
subscription-manager (make sure the rhsm service is running, see rhbz#1872902)
jq

./build.sh -h
Generates an AlmaLinux OS rootfs and Dockerfile
Usage: build.sh [OPTION]...
  -h        show this message and exit
  -o        output directory path. Default is "./result"
  -t        build type. Possible options are base, default, init, micro and minimal

Use command below to create default docker files for almalinux:8container image

./build.sh -o default -t default

Use command below to create minimal docker files for almalinux:minimalcontainer image

./build.sh -o minimal -t minimal

Use command below to create base docker files for almalinux:basecontainer image

./build.sh -o base -t base

Use command below to create micro docker files for almalinux:microcontainer image

./build.sh -o micro -t micro

Use command below to create init docker files for almalinux:initcontainer image

./build.sh -o init -t init

Use command below to create all type of docker images

for type in default minimal base micro init; do ./build.sh -o $type -t $type; done

Known issues

You may see the following message in the output:

2021-02-05 20:28:10,554: Error in atexit._run_exitfuncs:
2021-02-05 20:28:10,555: Traceback (most recent call last):
2021-02-05 20:28:10,555: File "/usr/lib/python3.6/site-packages/dasbus/client/handler.py", line 477, in _get_method_reply
2021-02-05 20:28:10,557: return self._handle_method_error(error)
2021-02-05 20:28:10,559: File "/usr/lib/python3.6/site-packages/dasbus/client/handler.py", line 497, in _handle_method_error
2021-02-05 20:28:10,560: raise exception from None
2021-02-05 20:28:10,562: dasbus.error.DBusError: umount of /mnt/sysimage/run failed (32)

This happens because we need to unmount /run in the kickstart file. It doesn't affect the result, see rhbz#1904008 for details.

Using Docker

You need a system with docker installed for this approach. This uses almalinux/ks2rootfs build utility using docker.

Use command below to create default docker files

docker run --rm --privileged -v "$PWD:/build:z" \
    -e KICKSTART_FILE=kickstarts/almalinux-8-default.ks \
    -e IMAGE_NAME=almalinux-8-docker-default.x86_64.tar.gz \
    -e OUTPUT_DIR=default \
    -e BUILD_TYPE=default \
    almalinux/ks2rootfs

Use command below to create base docker files

docker run --rm --privileged -v "$PWD:/build:z" \
    -e KICKSTART_FILE=kickstarts/almalinux-8-base.ks \
    -e IMAGE_NAME=almalinux-8-docker-base.x86_64.tar.gz \
    -e OUTPUT_DIR=base \
    -e BUILD_TYPE=base \
    almalinux/ks2rootfs

Use command below to create init docker files

docker run --rm --privileged -v "$PWD:/build:z" \
    -e KICKSTART_FILE=kickstarts/almalinux-8-init.ks \
    -e IMAGE_NAME=almalinux-8-docker-init.x86_64.tar.gz \
    -e OUTPUT_DIR=init \
    -e BUILD_TYPE=init \
    almalinux/ks2rootfs

Please make note docker utility cannot be used to generate micro and minimal packages. Work in progress to resolve it.

References

Docker documentaion - Create a base image
Opencontainers image-spec annotations/labels
RedHat Kickstart Reference guide

License

Licensed under the MIT license, see the LICENSE file for details.

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