Buildah : Install

	Install Buildah that supports to create Container images. It's possible to create OCI (Open Container Initiative) format image without specific Service Daemon.
[1]	Install Buildah.

root@dlp:~#  apt -y install buildah

[2]	This is the basic usage for Buildah. Create a working container from an image.

# create a working container from [debian] image root@dlp:~#  buildah from debian debian-working-container # show container list root@dlp:~#  buildah containers CONTAINER ID BUILDER IMAGE ID IMAGE NAME CONTAINER NAME e9f9b36a6e56 * 047bd8d81940 docker.io/library/debian:latest debian-working-container # show container image list root@dlp:~#  buildah images REPOSITORY TAG IMAGE ID CREATED SIZE docker.io/library/debian latest 047bd8d81940 11 days ago 124 MB # possible to use images on podman root@dlp:~#  podman images REPOSITORY TAG IMAGE ID CREATED SIZE docker.io/library/debian latest 047bd8d81940 11 days ago 124 MB

[3]	Operate Working Container.

# set shell variable root@dlp:~#  container=$(buildah from debian) root@dlp:~#  echo $container debian-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@b1bd18cfd87d:/#  apt-get update; apt-get -y install python3 root@b1bd18cfd87d:/#  exit root@dlp:~#  buildah run $container whereis python3 python3: /usr/bin/python3 /usr/lib/python3 /etc/python3 /usr/share/python3 /usr/share/man/man1/python3.1.gz

[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/3f24c40e0bba1980735d64d5a5027fc578781927667af8a3bc4f25e733dbca5e/merged root@dlp:~#  ll /var/lib/containers/storage/overlay/3f24c40e0bba1980735d64d5a5027fc578781927667af8a3bc4f25e733dbca5e/merged total 68 lrwxrwxrwx 1 root root 7 May 13 04:25 bin -> usr/bin drwxr-xr-x 2 root root 4096 May 13 04:25 boot drwxr-xr-x 2 root root 4096 Aug 11 09:00 dev drwxr-xr-x 1 root root 4096 Aug 22 10:47 etc drwxr-xr-x 2 root root 4096 May 13 04:25 home ..... ..... root@dlp:~#  buildah umount $container b1bd18cfd87d520b7cd0072967ee662b2a2428afcedafecd60627292700d08df

[6]	Create a container image from Working Container.

root@dlp:~#  buildah commit $container my-debian:latest Getting image source signatures Copying blob cb9eb84282d0 skipped: already exists Copying blob d9286a001850 done | Copying config 77fd1e5643 done | Writing manifest to image destination 77fd1e5643fd483119cecff368302e96bb85e265806741ea15a17cb6ff227938 root@dlp:~#  buildah images REPOSITORY TAG IMAGE ID CREATED SIZE localhost/my-debian latest 77fd1e5643fd 16 seconds ago 187 MB docker.io/library/debian latest 047bd8d81940 11 days ago 124 MB # possible to use container images on podman root@dlp:~#  podman run localhost/my-debian hostname 0641e41ad3c1

[7]	Push a container image to specified Registry.

root@dlp:~#  buildah images REPOSITORY TAG IMAGE ID CREATED SIZE localhost/my-debian latest 77fd1e5643fd 58 seconds ago 187 MB docker.io/library/debian latest 047bd8d81940 11 days ago 124 MB # push [localhost/my-debian] image to [node01.srv.world:5000] registry # if target registry is not on SSL/TLS, need [--tls-verify=false] option root@dlp:~#  buildah push --tls-verify=false localhost/my-debian dlp.srv.world:5000/my-debian root@dlp:~#  curl dlp.srv.world:5000/v2/_catalog {"repositories":["my-debian"]} # possible to Pull from other nodes root@node01:~#  podman pull --tls-verify=false dlp.srv.world:5000/my-debian root@node01:~#  podman images REPOSITORY TAG IMAGE ID CREATED SIZE dlp.srv.world:5000/my-debian latest 77fd1e5643fd 2 minutes ago 187 MB localhost/my-debian latest 77fd1e5643fd 2 minutes ago 187 MB docker.io/library/debian latest 047bd8d81940 11 days ago 124 MB