Buildah : Install2018/08/30 |
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Install Buildah that supports to create Container images.
It's possible to create OCI (Open Container Initiative) format image or Docker format image without Docker Service Daemon.
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| [1] | Install Buildah. |
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[root@dlp ~]# yum -y install buildah
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| [2] | This is the basic usage for Buildah. Create a working container from an image. |
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# create from [centos] image [root@dlp ~]# buildah from centos Getting image source signatures Copying blob sha256:256b176beaff7815db2a93ee2071621ae88f451bb1e198ca73010ed5bba79b65 71.23 MiB / 71.23 MiB 4s Copying config sha256:5182e96772bf11f4b912658e265dfe0db8bd314475443b6434ea708784192892 2.13 KiB / 2.13 KiB 0s Writing manifest to image destination Storing signatures centos-working-container # container list [root@dlp ~]# buildah containers CONTAINER ID BUILDER IMAGE ID IMAGE NAME CONTAINER NAME c28ce3a30750 * 5182e96772bf docker.io/library/centos:latest centos-working-container # container image list [root@dlp ~]# buildah images IMAGE ID IMAGE NAME CREATED AT SIZE 5182e96772bf docker.io/library/centos:latest Aug 7, 2018 04:21 208 MB # if you'd like to create empty container, specify [scratch] [root@dlp ~]# buildah from scratch working-container [root@dlp ~]# buildah containers CONTAINER ID BUILDER IMAGE ID IMAGE NAME CONTAINER NAME c28ce3a30750 * 5182e96772bf docker.io/library/centos:latest centos-working-container df3709dc7552 * scratch working-container # [scratch] is empty, so not listed on image list [root@dlp ~]# buildah images IMAGE ID IMAGE NAME CREATED AT SIZE 5182e96772bf docker.io/library/centos:latest Aug 7, 2018 04:21 208 MB |
| [3] | Operate working container. |
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# set shell variable [root@dlp ~]# container=$(buildah from centos) [root@dlp ~]# echo $container centos-working-container-2 # possible to run commands [root@dlp ~]# buildah run $container echo "Hello Buildah" Hello Buildah [root@dlp ~]# buildah run $container bash [root@mrsdalloway /]# yum install ruby [root@mrsdalloway /]# [root@dlp ~]# buildah run $container whereis ruby ruby: /usr/bin/ruby /usr/lib64/ruby /usr/share/ruby |
| [4] | Copy content into working container. |
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[root@dlp ~]# echo "buildah test" > buildah.txt [root@dlp ~]# buildah copy $container buildah.txt /tmp/buildah.txt ce9440fee6e37151fcc872dbf3fca2a77b95e66a627cabed14ba8349e1825607[root@dlp ~]# buildah run $container cat /tmp/buildah.txt buildah test |
| [5] | Edit settings of working container. |
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[root@dlp ~]#
buildah config --hostname my-hostname $container [root@dlp ~]# buildah run $container hostname my-hostname # show current settings [root@dlp ~]# buildah inspect $container
{
"Type": "buildah 0.0.1",
"FromImage": "docker.io/library/centos:latest",
"FromImageID": "5182e96772bf11f4b912658e265dfe0db8bd314475443b6434ea708784192892",
.....
.....
"config": {
"Hostname": "my-hostname",
"Domainname": "",
"User": "",
"AttachStdin": false,
.....
.....
# other options for [buildah config] [root@dlp ~]# buildah config -h NAME: buildah config - Update image configuration settings USAGE: buildah config [command options] CONTAINER-NAME-OR-ID DESCRIPTION: Modifies the configuration values which will be saved to the image OPTIONS: --annotation annotation, -a annotation add annotation e.g. annotation=value, for the target image (default []) --arch architecture set architecture of the target image --author information set image author contact information --cmd command set the default command to run for containers based on the image --comment comment set a comment in the target image --created-by description set description of how the image was created --domainname name set a domain name for containers based on image --entrypoint entry point set entry point for containers based on image --env environment variable, -e ..... add environment variable to be set when running containers based on image (default []) --history-comment comment set a comment for the history of the target image --hostname name set a hostname for containers based on image --label label, -l label add image configuration label e.g. label=value --onbuild value add onbuild command to be run on images based on this image. Only supported on 'docker' formatted images --os operating system set operating system of the target image --port port, -p port add port to expose when running containers based on image (default []) --shell shell add shell to run in containers --stop-signal stop signal set stop signal for containers based on image --user user, -u user set default user to run inside containers based on image --volume volume, -v volume add default volume path to be created for containers based on image (default []) --workingdir directory set working directory for containers based on image |
| [6] | Mount filesystem of working container. |
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[root@dlp ~]# buildah mount $container /var/lib/containers/storage/overlay/58c70666c54601d8ce6c96c6079ed45ca60af25ff97cadc77cdfe2c937081b25/merged[root@dlp ~]# ll /var/lib/containers/storage/overlay/58c70666c54601d8ce6c96c6079ed45ca60af25ff97cadc77cdfe2c937081b25/merged total 16 -rw-r--r--. 1 root root 12005 Aug 5 07:05 anaconda-post.log lrwxrwxrwx. 1 root root 7 Aug 5 07:04 bin -> usr/bin drwxr-xr-x. 2 root root 6 Aug 5 07:04 dev drwxr-xr-x. 47 root root 4096 Aug 5 07:05 etc drwxr-xr-x. 2 root root 6 Apr 11 13:59 home ..... ..... # unmount [root@dlp ~]# buildah umount $container cb2fdccb666dcfd76ce526021db07652d87702bb245c711ef28ff5b34ed5588e |
| [7] | Create a container image from working container. |
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[root@dlp ~]# buildah commit $container my-centos:latest Getting image source signatures Skipping fetch of repeat blob sha256:1d31b5806ba40b5f67bde96f18a181668348934a44c9253b420d5f04cfb4e37a Copying blob sha256:4f4fb700ef54461cfa02571ae0db9a0dc1e0cdb5577484a6d75e68dc38e8acc1 32 B / 32 B 0s Copying config sha256:4b5dfca9b6165627a7328eef35db5216f28c5c0504e05c2bb8d3e98a1d2382a3 1.18 KiB / 1.18 KiB 0s Writing manifest to image destination Storing signatures 4b5dfca9b6165627a7328eef35db5216f28c5c0504e05c2bb8d3e98a1d2382a3[root@dlp ~]# buildah images IMAGE ID IMAGE NAME CREATED AT SIZE 5182e96772bf docker.io/library/centos:latest Aug 7, 2018 04:21 208 MB 4b5dfca9b616 localhost/my-centos:latest Aug 28, 2018 19:13 208 MB |
| [8] | Push a container image to specified location. |
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[root@dlp ~]# buildah images IMAGE ID IMAGE NAME CREATED AT SIZE 5182e96772bf docker.io/library/centos:latest Aug 7, 2018 04:21 208 MB 4b5dfca9b616 localhost/my-centos:latest Aug 28, 2018 17:13 208 MB # push [localhost/my-centos] image to [www.srv.world:5000] registry [root@dlp ~]# buildah push localhost/my-centos www.srv.world:5000/my-centos Getting image source signatures Copying blob sha256:1d31b5806ba40b5f67bde96f18a181668348934a44c9253b420d5f04cfb4e37a 198.64 MiB / 198.64 MiB 19s Copying blob sha256:5f70bf18a086007016e948b04aed3b82103a36bea41755b6cddfaf10ace3c6ef 1.00 KiB / 1.00 KiB 0s Copying config sha256:4b5dfca9b6165627a7328eef35db5216f28c5c0504e05c2bb8d3e98a1d2382a3 1.18 KiB / 1.18 KiB 0s Writing manifest to image destination Copying config sha256:4b5dfca9b6165627a7328eef35db5216f28c5c0504e05c2bb8d3e98a1d2382a3 0 B / 1.18 KiB 0s Writing manifest to image destination Storing signatures # possible to Pull on other Docker Nodes [root@www ~]# docker pull www.srv.world:5000/my-centos [root@www ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE www.srv.world:5000/my-centos latest 4b5dfca9b616 40 hours ago 200 MB docker.io/centos latest 5182e96772bf 3 weeks ago 200 MB docker.io/registry 2 b2b03e9146e1 7 weeks ago 33.3 MB |
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