Buildah : Install2021/08/28

	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

Resolved "debian" as an alias (/etc/containers/registries.conf.d/shortnames.conf)
Getting image source signatures
Copying blob 4c25b3090c26 done
Copying config fe3c5de034 done
Writing manifest to image destination
Storing signatures
debian-working-container

# show container list

root@dlp:~#

buildah containers

CONTAINER ID  BUILDER  IMAGE ID     IMAGE NAME                       CONTAINER NAME
dd2673f1bad6     *     fe3c5de03486 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   fe3c5de03486   11 days ago   129 MB

# possible to use images on podman

root@dlp:~#

podman images

REPOSITORY                TAG     IMAGE ID      CREATED      SIZE
docker.io/library/debian  latest  fe3c5de03486  11 days ago  129 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@6ad9282ae0cc:/#

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

root@6ad9282ae0cc:/#

exit

root@dlp:~#

buildah run $container whereis python3

python3: /usr/bin/python3.9 /usr/bin/python3 /usr/lib/python3.9 /usr/lib/python3 /etc/python3.9 /etc/python3 /usr/local/lib/python3.9 /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/3fac9db0907578477012da7669a38aff0e7fc9c69595c81defa6e38ac7474067/merged

root@dlp:~#

ll /var/lib/containers/storage/overlay/3fac9db0907578477012da7669a38aff0e7fc9c69595c81defa6e38ac7474067/merged

total 92
drwxr-xr-x 2 root root 4096 Aug 15 19:00 bin
drwxr-xr-x 2 root root 4096 Apr 10 15:15 boot
drwxr-xr-x 2 root root 4096 Aug 15 19:00 dev
drwxr-xr-x 1 root root 4096 Aug 28 06:46 etc
drwxr-xr-x 2 root root 4096 Apr 10 15:15 home
drwxr-xr-x 1 root root 4096 Aug 15 19:00 lib
.....
.....

root@dlp:~#

buildah umount $container

6ad9282ae0cccf7567ffe9c56a6572f6402d52acedaae3934a6bc8afdc848ad3

[6]	Create a container image from Working Container.

root@dlp:~#

buildah commit $container my-debian:latest

Getting image source signatures
Copying blob a881cfa23a78 skipped: already exists
Copying blob b6d8b39747d5 done
Copying config 7aa4a609ff done
Writing manifest to image destination
Storing signatures
7aa4a609ff69dcca4ff517cc696e3aba921f54307cff89c678ef2646a1052b13

root@dlp:~#

buildah images

REPOSITORY                 TAG      IMAGE ID       CREATED          SIZE
localhost/my-debian        latest   7aa4a609ff69   16 seconds ago   181 MB
docker.io/library/debian   latest   fe3c5de03486   11 days ago      129 MB

# possible to use container images on podman

root@dlp:~#

podman run localhost/my-debian hostname

ea82e055b05f

[7]	Push a container image to specified Registry.

root@dlp:~#

buildah images

REPOSITORY                 TAG      IMAGE ID       CREATED          SIZE
localhost/my-debian        latest   7aa4a609ff69   16 seconds ago   181 MB
docker.io/library/debian   latest   fe3c5de03486   11 days ago      129 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 node01.srv.world:5000/my-debian

root@dlp:~#

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

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

# possible to Pull from other nodes

root@node01:~#

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

root@node01:~#

podman images

REPOSITORY                       TAG     IMAGE ID      CREATED        SIZE
node01.srv.world:5000/my-debian  latest  7aa4a609ff69  2 minutes ago  181 MB
docker.io/library/debian         latest  fe3c5de03486  11 days ago    129 MB

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