Buildah : Install2022/09/02

	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 [ubuntu] image

root@dlp:~#

buildah from ubuntu

Resolved "ubuntu" as an alias (/etc/containers/registries.conf.d/shortnames.conf)
Trying to pull docker.io/library/ubuntu:latest...
Getting image source signatures
Copying blob 2b55860d4c66 done
Copying config 2dc39ba059 done
Writing manifest to image destination
Storing signatures
ubuntu-working-container

# show container list

root@dlp:~#

buildah containers

CONTAINER ID  BUILDER  IMAGE ID     IMAGE NAME                       CONTAINER NAME
874af682530f     *     2dc39ba059dc docker.io/library/ubuntu:latest  ubuntu-working-container

# show container image list

root@dlp:~#

buildah images

REPOSITORY                 TAG      IMAGE ID       CREATED       SIZE
docker.io/library/ubuntu   latest   2dc39ba059dc   4 hours ago   80.4 MB

# possible to use images on podman

root@dlp:~#

podman images

REPOSITORY                TAG         IMAGE ID      CREATED      SIZE
docker.io/library/ubuntu  latest      2dc39ba059dc  4 hours ago  80.4 MB

[3]	Operate Working Container.

# set shell variable

root@dlp:~#

container=$(buildah from ubuntu)

root@dlp:~#

echo $container

ubuntu-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@9ae231095c55:/#

apt-get update; apt-get -y install python3

root@9ae231095c55:/#

exit

root@dlp:~#

buildah run $container whereis python3

python3: /usr/bin/python3 /usr/lib/python3 /etc/python3 /usr/share/python3

[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/276840fef6aad0c0332656ccf310674136f9937763b00100d8e6b8f08e6dd8cd/merged

root@dlp:~#

ll /var/lib/containers/storage/overlay/276840fef6aad0c0332656ccf310674136f9937763b00100d8e6b8f08e6dd8cd/merged

total 80
dr-xr-xr-x 1 root root 4096 Sep  2 03:47 ./
drwx------ 5 root root 4096 Sep  2 03:50 ../
lrwxrwxrwx 1 root root    7 Aug 15 11:50 bin -> usr/bin/
drwxr-xr-x 2 root root 4096 Apr 18 10:28 boot/
drwxr-xr-x 2 root root 4096 Aug 15 11:53 dev/
drwxr-xr-x 1 root root 4096 Sep  2 03:48 etc/
.....
.....

root@dlp:~#

buildah umount $container

9ae231095c554075e872feec749401ab6245eee3ea3e3df0f61f067b700c763b

[6]	Create a container image from Working Container.

root@dlp:~#

buildah commit $container my-ubuntu:latest

Getting image source signatures
Copying blob 7f5cbd8cc787 skipped: already exists
Copying blob 963b6ca318b0 done
Copying config 03c58cc53f done
Writing manifest to image destination
Storing signatures
03c58cc53f054930ea9b85faf233a97b2b7f128d55a8114b8f0fc8806b949a9c

root@dlp:~#

buildah images

REPOSITORY                 TAG      IMAGE ID       CREATED          SIZE
localhost/my-ubuntu        latest   03c58cc53f05   17 seconds ago   147 MB
docker.io/library/ubuntu   latest   2dc39ba059dc   4 hours ago      80.4 MB

# possible to use container images on podman

root@dlp:~#

podman run localhost/my-ubuntu hostname

61851ab9b59f

[7]	Push a container image to specified Registry.

root@dlp:~#

buildah images

REPOSITORY                 TAG      IMAGE ID       CREATED         SIZE
localhost/my-ubuntu        latest   03c58cc53f05   4 minutes ago   147 MB
docker.io/library/ubuntu   latest   2dc39ba059dc   4 hours ago     80.4 MB

# push [localhost/my-ubuntu] 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-ubuntu node01.srv.world:5000/my-ubuntu

root@dlp:~#

curl node01.srv.world:5000/v2/_catalog

{"repositories":["my-ubuntu"]}

# possible to Pull from other nodes

root@node01:~#

podman pull --tls-verify=false node01.srv.world:5000/my-ubuntu

root@node01:~#

podman images

REPOSITORY                       TAG         IMAGE ID      CREATED        SIZE
node01.srv.world:5000/my-ubuntu  latest      03c58cc53f05  7 minutes ago  147 MB
docker.io/library/registry       2           3a0f7b0a13ef  3 weeks ago    24.7 MB

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