Buildah : Create images from Scratch2024/11/07

	Create container images from an empty container image.
[1]	Start to create with [scratch] image.

# create an empty container with [scratch]

[root@dlp ~]#

newcontainer=$(buildah from scratch)

[root@dlp ~]#

buildah containers

CONTAINER ID  BUILDER  IMAGE ID     IMAGE NAME                       CONTAINER NAME
9e5f4bd9c78b     *     0e2b2f101698 registry.fedoraproject.org/fe... fedora-working-container
63d16a1f3443     *     0e2b2f101698 registry.fedoraproject.org/fe... fedora-working-container-1
3fc40a14b693     *                  scratch                          working-container

# mount [scratch] container

[root@dlp ~]#

scratchmnt=$(buildah mount $newcontainer)

[root@dlp ~]#

echo $scratchmnt

/var/lib/containers/storage/overlay/161f43b81a12d8ef5a552e30b0d4a9f6300093337586c84cf3459670647ebf13/merged

# install packages to [scratch] container

[root@dlp ~]#

dnf -y group install server-product-environment --releasever=41 --installroot=$scratchmnt --use-host-config

# unmount

[root@dlp ~]#

buildah umount $newcontainer

3fc40a14b693d354be793501a2ecc8d84b9033b9d6f1d273ad47b7ee39e55880

# run container

[root@dlp ~]#

buildah run $newcontainer bash

[root@3fc40a14b693 /]#
[root@3fc40a14b693 /]#

cat /etc/os-release

NAME="Fedora Linux"
VERSION="41 (Server Edition)"
RELEASE_TYPE=stable
ID=fedora
VERSION_ID=41
VERSION_CODENAME=""
PLATFORM_ID="platform:f41"
PRETTY_NAME="Fedora Linux 41 (Server Edition)"
ANSI_COLOR="0;38;2;60;110;180"
LOGO=fedora-logo-icon
CPE_NAME="cpe:/o:fedoraproject:fedora:41"
HOME_URL="https://fedoraproject.org/"
DOCUMENTATION_URL="https://docs.fedoraproject.org/en-US/fedora/f41/system-administrators-guide/"
SUPPORT_URL="https://ask.fedoraproject.org/"
BUG_REPORT_URL="https://bugzilla.redhat.com/"
REDHAT_BUGZILLA_PRODUCT="Fedora"
REDHAT_BUGZILLA_PRODUCT_VERSION=41
REDHAT_SUPPORT_PRODUCT="Fedora"
REDHAT_SUPPORT_PRODUCT_VERSION=41
SUPPORT_END=2025-12-15
VARIANT="Server Edition"
VARIANT_ID=server

[root@3fc40a14b693 /]#

exit

# add images

[root@dlp ~]#

buildah commit $newcontainer fedora-server:latest

Getting image source signatures
Copying blob 7f0406261bd7 done   |
Copying config 6503253a5e done   |
Writing manifest to image destination
6503253a5e5875da49cf506acafcde1d8c84d1bbec5f8a3965899358bc4178b5

[root@dlp ~]#

buildah images

REPOSITORY                          TAG      IMAGE ID       CREATED          SIZE
localhost/fedora-server             latest   6503253a5e58   19 seconds ago   1.39 GB
localhost/my-fedora                 latest   0ee32bb6225b   39 minutes ago   294 MB
registry.fedoraproject.org/fedora   latest   0e2b2f101698   18 hours ago     163 MB

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