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Adding podman build container image

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FossilOrigin-Name: d2aa4c1b7aad2069d05a56e51e1f19086262743f78fc987433efa702d1bd1a9f
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mek 2023-04-19 15:52:01 +00:00
parent b07b6bbc2b
commit 5da5af3d42
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.fossil-settings/ignore-glob
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*.dockerfile
*~
Dockerfile*
Dockerfile.*

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Makefile
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TANGLE=tclsh scripts/tangle.tcl
ALL=ubi9epel ubuntu fossil opensuse alpine
ALL=ubi9epel ubuntu fossil opensuse alpine podman
.SUFFIXES: .md .dockerfile .test

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README.md
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@ -35,6 +35,9 @@ I like to insure that my containers follow a few simple rules.
* OpenSuse is my favorite development Linux distrobution.
* [alpine](alpine.md)
* Need a good base alpine image to use for deployments.
* [podman](podman.md)
* A UBI9 based podman container to build docker images.
* include [storage.conf](files/podman/storage.conf)
## As always, go Guardians!

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files/podman/storage.conf Normal file
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# This file is the configuration file for all tools
# that use the containers/storage library. The storage.conf file
# overrides all other storage.conf files. Container engines using the
# container/storage library do not inherit fields from other storage.conf
# files.
#
# Note: The storage.conf file overrides other storage.conf files based on this precedence:
# /usr/containers/storage.conf
# /etc/containers/storage.conf
# $HOME/.config/containers/storage.conf
# $XDG_CONFIG_HOME/containers/storage.conf (If XDG_CONFIG_HOME is set)
# See man 5 containers-storage.conf for more information
# The "container storage" table contains all of the server options.
[storage]
# Default Storage Driver, Must be set for proper operation.
driver = "overlay"
# Temporary storage location
runroot = "/run/containers/storage"
# Primary Read/Write location of container storage
# When changing the graphroot location on an SELINUX system, you must
# ensure the labeling matches the defaul
# Storage path for rootless users
#
# rootless_storage_path = "$HOME/.local/share/containers/storage"
# Transient store mode makes all container metadata be saved in temporary storage
# (i.e. runroot above). This is faster, but doesn't persist across reboots.
# Additional garbage collection must also be performed at boot-time, so this
# option should remain disabled in most configurations.
# transient_store = true
[storage.options]
# Storage options to be passed to underlying storage drivers
# AdditionalImageStores is used to pass paths to additional Read/Only image stores
# Must be comma separated list.
additionalimagestores = [
]
# Allows specification of how storage is populated when pulling images. This
# option can speed the pulling process of images compressed with format
# zstd:chunked. Containers/storage looks for files within images that are being
# pulled from a container registry that were previously pulled to the host. It
# can copy or create a hard link to the existing file when it finds them,
# eliminating the need to pull them from the container registry. These options
# can deduplicate pulling of content, disk storage of content and can allow the
# kernel to use less memory when running containers.
# containers/storage supports four keys
# * enable_partial_images="true" | "false"
# Tells containers/storage to look for files previously pulled in storage
# rather then always pulling them from the container registry.
# * use_hard_links = "false" | "true"
# Tells containers/storage to use hard links rather then create new files in
# the image, if an identical file already existed in storage.
# * ostree_repos = ""
# Tells containers/storage where an ostree repository exists that might have
# previously pulled content which can be used when attempting to avoid
# pulling content from the container registry
pull_options = {enable_partial_images = "false", use_hard_links = "false", ostree_repos=""}
# Remap-UIDs/GIDs is the mapping from UIDs/GIDs as they should appear inside of
# a container, to the UIDs/GIDs as they should appear outside of the container,
# and the length of the range of UIDs/GIDs. Additional mapped sets can be
# listed and will be heeded by libraries, but there are limits to the number of
# mappings which the kernel will allow when you later attempt to run a
# container.
#
# remap-uids = 0:1668442479:65536
# remap-gids = 0:1668442479:65536
# Remap-User/Group is a user name which can be used to look up one or more UID/GID
# ranges in the /etc/subuid or /etc/subgid file. Mappings are set up starting
# with an in-container ID of 0 and then a host-level ID taken from the lowest
# range that matches the specified name, and using the length of that range.
# Additional ranges are then assigned, using
#
# remap-user = "containers"
# remap-group = "containers"
# Root-auto-userns-user is a user name which can be used to look up one or more UID/GID
# ranges in the /etc/subuid and /etc/subgid file. These ranges will be partitioned
# to containers configured to create automatically a user namespace. Containers
# configured to automatically create a user namespace can still overlap with containers
# having an explicit mapping set.
# This setting is ignored when running as rootless.
# root-auto-userns-user = "storage"
#
# Auto-userns-min-size is the minimum size for a user namespace created automatically.
# auto-userns-min-size=1024
#
# Auto-userns-max-size is the minimum size for a user namespace created automatically.
# auto-userns-max-size=65536
[storage.options.overlay]
# ignore_chown_errors can be set to allow a non privileged
# separation between the users in the container. Only supported for the overlay
# and vfs drivers.
#ignore_chown_errors = "false"
# Inodes is used to set a maximum inodes of the container image.
# inodes = ""
# Path to an helper program to use for mounting the file system instead of mounting it
# directly.
#mount_program = "/usr/bin/fuse-overlayfs"
# mountopt specifies comma separated list of extra mount options
mountopt = "nodev,metacopy=on"
# Set to skip a PRIVATE bind mount on the storage home directory.
# skip_mount_home = "false"
# Size is used to set a maximum size of the container image.
# size = ""
# ForceMask specifies the permissions mask that is used for new files and
# directories.
#
# The values "shared" and "private" are accepted.
# Octal permission masks are also accepted.
#
# "": No value specified.
# All files/directories, get set with the permissions identified within the
# image.
# "private": it is equivalent to 0700.
# All files/directories get set with 0700 permissions. The owner has rwx
# access to the files. No other users on the system can access the files.
# This setting could be used with networked based homedirs.
# "shared": it is equivalent to 0755.
# The owner has rwx access to the files and everyone else can read, access
# and execute them. This setting is useful for sharing containers storage
# with other users. For instance have a storage owned by root but shared
# to rootless users as an additional store.
# NOTE: All files within the image are made readable and executable by any
# user on the system. Even /etc/shadow within your image is now readable by
# any user.
#
# OCTAL: Users can experiment with other OCTAL Permissions.
#
# Note: The force_mask Flag is an experimental feature, it could change in the
# future. When "force_mask" is set the original permission mask is stored in
# the "user.containers.override_stat" xattr and the "mount_program" option must
# be specified. Mount programs like "/usr/bin/fuse-overlayfs" present the
# extended attribute permissions to processes within containers rather than the
# "force_mask" permissions.
#
# force_mask = ""
[storage.options.thinpool]
# Storage Options for thinpool
# autoextend_percent determines the amount by which pool needs to be
# grown. This is specified in terms of % of pool size. So a value of 20 means
# that when threshold is hit, pool will be grown by 20% of existing
# pool size.
# autoextend_percent = "20"
# autoextend_threshold determines the pool extension threshold in terms
# of percentage of pool size. For example, if threshold is 60, that means when
# pool is 60% full, threshold has been hit.
# autoextend_threshold = "80"
# base
# thin pool. Required if you setup devicemapper.
# directlvm_device = ""
# directlvm_device_force wipes device even if device already has a filesystem.
# directlvm_device_force = "True"
# fs specifies the filesystem type to use for the base device.
# fs="xfs"
# log_level sets the log level of devicemapper.
# 0: LogLevelSuppress 0 (Default)
# 2: LogLevelFatal
# 3: LogLevelErr
# 4: LogLevelWarn
# 5: LogLevelNotice
# 6: LogLevelInfo
# 7: LogLevelDebug
# log_level = "7"
# min_free_space specifies the min free space percent in a thin pool require for
# new device creation to succeed. Valid values are from 0% - 99%.
# Value 0% disables
# min_free_space = "10%"
# mkfsarg specifies extra mkfs arguments to be used when creating the base
# device.
# mkfsarg = ""
# metadata_size is used to set the `pvcreate --metadatasize` options when
# creating thin devices. Default is 128k
# metadata_size = ""
# Size is used to set a maximum size of the container image.
# size = ""
# use_deferred_removal marks devicemapper block device for deferred removal.
# If the thinpool is in use when the driver attempts to remove it, the driver
# tells the kernel to remove it as soon as possible. Note this does not free
# up the disk space, use deferred deletion to fully remove the thinpool.
# use_deferred_removal = "True"
# use_deferred_deletion marks thinpool device for deferred deletion.
# If the device is busy when the driver attempts to delete it, the driver
# will attempt to delete device every 30 seconds until successful.
# If the program using the driver exits, the driver will continue attempting
# to cleanup the next time the driver is used. Deferred deletion permanently
# deletes the device and all data stored in device will be lost.
# use_deferred_deletion = "True"
# xfs_nospace_max_retries specifies the maximum number of retries XFS should
# attempt to complete IO when ENOSPC (no space) error is returned by
# underlying storage device.
# xfs_nospace_max_retries = "0"

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# Podman Container Image
This is my version of [Podman
Image](https://github.com/containers/podman/blob/main/contrib/podmanimage/stable/Containerfile).
I will be building with a RH UBI Image (version 9).
## UBI9 Podman Image
### FROM
An `ARG` for the version, `VER` is there. This can be overridden with `--build-arg 'VER=<version>'`.
```
<<base.image>>=
ARG VER=latest
FROM docker.io/redhat/ubi9:${VER}
@ % def VER
```
### Setup user specific arguments.
Setup a base username, uid, gid, and work directory with some defaults. All of these can be overridden with `-build-arg "ARG=VALUE"`.
```
<<base.userargs>>=
ARG baseUSER="podman"
ARG baseUID=5000
ARG baseGID=5000
ARG baseDIR="/work"
@
```
### Setup and install packages
The container-commons package on UBI9 does not install the storage.conf
thatr we need, so we copy the file here.
```
<<base.software>>=
RUN dnf -y update && \
rpm --setcaps shadow-utils 2>/dev/null && \
dnf -y install podman podman-docker \
fuse-overlayfs openssh-clients \
ed joe tcl tcllib \
--exclude container-selinux && \
rm -rf /var/cache /var/log/dnf* \
/var/log/yum.*
ADD files/podman/storage.conf /usr/share/containers/storage.conf
@
```
### Add podman user
You'll need to be careful here to not change a current directory. For example, do not set baseDIR="/bin".
Add the group, user, (with the home directory of the user ad the work directory) and insure the proper ownership on the work directory.
```
<<base.setupuser>>=
RUN useradd ${baseUSER}; \
echo -e "${baseUSER}:1:999\n${baseUSER}:1001:64535" > /etc/subuid; \
echo -e "${baseUSER}:1:999\n${baseUSER}:1001:64535" > /etc/subgid;
@
```
### Additional Podman Changes
Additonal changes are needed to the base image for podman to work as
expected.
```
<<base.podmansetup>>=
ARG _REPO_URL="https://raw.githubusercontent.com/containers/podman/main/contrib/podmanimage/stable"
ADD $_REPO_URL/containers.conf /etc/containers/containers.conf
ADD $_REPO_URL/podman-containers.conf /home/podman/.config/containers/containers.conf
RUN mkdir -p /home/podman/.local/share/containers && \
chown podman:podman -R /home/podman && \
chmod 644 /etc/containers/containers.conf
# Copy & modify the defaults to provide reference if runtime changes needed.
# Changes here are required for running with fuse-overlay storage inside container.
RUN sed -e 's|^#mount_program|mount_program|g' \
-e '/additionalimage.*/a "/var/lib/shared",' \
-e 's|^mountopt[[:space:]]*=.*$|mountopt = "nodev,fsync=0"|g' \
/usr/share/containers/storage.conf \
> /etc/containers/storage.conf
# Note VOLUME options must always happen after the chown call above
# RUN commands can not modify existing volumes
VOLUME /var/lib/containers
VOLUME /home/podman/.local/share/containers
RUN mkdir -p /var/lib/shared/overlay-images \
/var/lib/shared/overlay-layers \
/var/lib/shared/vfs-images \
/var/lib/shared/vfs-layers && \
touch /var/lib/shared/overlay-images/images.lock && \
touch /var/lib/shared/overlay-layers/layers.lock && \
touch /var/lib/shared/vfs-images/images.lock && \
touch /var/lib/shared/vfs-layers/layers.lock
ENV _CONTAINERS_USERNS_CONFIGURED=""
@
```
### Add repos and update software.
First, we'll add the EPEL repo. If you have additional repos you want to
enable, add them here.
```
<<base.enablerepos>>=
RUN dnf install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm && \
/usr/bin/crb enable
@
```
### Addtional root changes
We are still root at this point, this is where we add software, make
additional changes, etc.
The different sections are setup based on how often they may be changed.
The more likely some will change, the further down they should be to help
minimize the layers that need to be rebuilt.
### Make sure we the user, volume, and workdir setup
```
<<base.end>>=
# you can add entry point, etc. here.
@
```
### Pulling it all together
```
<<podman.dockerfile>>=
<<base.image>>
<<base.enablerepos>>
<<base.software>>
<<base.userargs>>
<<base.setupuser>>
<<base.podmansetup>>
<<base.end>>
@
```
## build and test
`docker build -t mek:podman -f podman.dockerfile .`
`docker run --rm -it mek:podman /bin/bash`
```
$ docker run --rm -it mek:podman /bin/bash
```