Buildah : Install2020/11/06 |
Install Buildah that supports to create Container images.
It's possible to create OCI (Open Container Initiative) format image without specific Service Daemon.
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[1] | Install Buildah. |
[root@dlp ~]# dnf -y install buildah
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[2] | This is the basic usage for Buildah. Create a working container from an image. |
# create a working container from [fedora] image [root@dlp ~]# buildah from fedora Getting image source signatures ... ... Writing manifest to image destination Storing signatures fedora-working-container # show container list [root@dlp ~]# buildah containers CONTAINER ID BUILDER IMAGE ID IMAGE NAME CONTAINER NAME 6eb265f49d8c * 79fd58dc7611 registry.fedoraproject.org/fe... fedora-working-container # show container image list [root@dlp ~]# buildah images REPOSITORY TAG IMAGE ID CREATED SIZE registry.fedoraproject.org/fedora latest 79fd58dc7611 9 days ago 181 MB # possible to use images on podman [root@dlp ~]# podman images REPOSITORY TAG IMAGE ID CREATED SIZE registry.fedoraproject.org/fedora latest 79fd58dc7611 9 days ago 181 MB |
[3] | Operate Working Container. |
# set shell variable [root@dlp ~]# container=$(buildah from fedora) [root@dlp ~]# echo $container fedora-working-container-1 # possible to run commands [root@dlp ~]# buildah run $container echo "Hello Buildah World" Hello Buildah World [root@dlp ~]# buildah run $container bash [root@173efa1d7495 /]# dnf install python3 [root@173efa1d7495 /]# [root@dlp ~]# buildah run $container whereis python3 python3: /usr/bin/python3.9 /usr/bin/python3 /usr/lib/python3.9 /usr/lib64/python3.9 /usr/include/python3.9 |
[4] | Copy files into Working Container. |
[root@dlp ~]# echo "buildah test" > buildah.txt [root@dlp ~]# buildah copy $container buildah.txt /tmp/buildah.txt 7553c62d21edda64a3067fa9805a5cd8e5781c6058be12eb9792d7e0e9781ed4[root@dlp ~]# buildah run $container cat /tmp/buildah.txt buildah test |
[5] | Mount filesystem of Working Container. |
[root@dlp ~]# buildah mount $container /var/lib/containers/storage/overlay/141c87f4f803ecdcca70413b4eb6eac8cb84f771306a3e79eb9e1f0c12e2e17a/merged[root@dlp ~]# ll /var/lib/containers/storage/overlay/141c87f4f803ecdcca70413b4eb6eac8cb84f771306a3e79eb9e1f0c12e2e17a/merged total 0 lrwxrwxrwx. 1 root root 7 Jul 28 03:22 bin -> usr/bin dr-xr-xr-x. 2 root root 6 Jul 28 03:22 boot drwxr-xr-x. 2 root root 6 Oct 27 16:48 dev drwxr-xr-x. 1 root root 38 Oct 27 16:48 etc drwxr-xr-x. 2 root root 6 Jul 28 03:22 home ..... .....[root@dlp ~]# buildah umount $container 173efa1d74958d55575e1009b130c2207ab0a32c05ff324c424beee33a0c24c2 |
[6] | Create a container image from Working Container. |
[root@dlp ~]# buildah commit $container my-fedora:latest Getting image source signatures ... ... ... Writing manifest to image destination Storing signatures a5660f75edd5e175d17609ebbcbf3cd2cf0bcf337ab0f8085a5f0b7061b2942b[root@dlp ~]# buildah images REPOSITORY TAG IMAGE ID CREATED SIZE localhost/my-fedora latest a5660f75edd5 25 seconds ago 369 MB registry.fedoraproject.org/fedora latest 79fd58dc7611 9 days ago 181 MB # possible tp use container images on podman [root@dlp ~]# podman run localhost/my-fedora echo my fedora my fedora |
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