How To Install podman on CentOS 8

As you know you can not run Docker containers without Docker Engine daemon.

Following tools will help you to power the use of Containers without an all time running daemon process.

Buildah:

It will facilitate building of OCI images.

Skopeo:

For sharing/findings container images on Docker registries, the Atomic registry, private registries, local directories and local OCI-layout directories.

Podman

Podman is used for running containers without the need of daemon.

Buildah’s commands replicate all of the commands that are found in Docker file. We create Buildah’s containers to allow to connect to be added back to the container image.

Podman helps us to have commands and functions required to maintain and modify OCI images, such as downloading, tagging and removing etc. It will give you access to create, run, and maintain containers created from those images.

Step 1: Installing Podman on Ubuntu

First of all the podman package is on a PPA repository which needs to be added prior to installation. For this start a new session on your Ubuntu system and run the below command.

sudo apt update
sudo apt-y install software-properties-common
sudo add-apt-repository -y ppa:projectatomic/ppa

After adding the repository, begin with the installation

sudo apt update
sudo apt -y install podman

Note: If you ran into any problems try the following for some version

How to fix issues with some ubuntu versions

When you’ve finish installing, you can display information related to the host, current storage stats, and build of podman.

podman  info
 host:
   BuildahVersion: 1.7-dev
   Conmon:
     package: 'cri-o-1.12: /usr/lib/crio/bin/conmon'
     path: /usr/lib/crio/bin/conmon
     version: 'conmon version 1.12.4-dev, commit: '
   Distribution:
     distribution: ubuntu
     version: "18.04"
   MemFree: 720404480
   MemTotal: 1033080832
   OCIRuntime:
     package: 'cri-o-runc: /usr/sbin/runc'
     path: /usr/sbin/runc
     version: 'runc version spec: 1.0.1-dev'
   SwapFree: 2047864832
   SwapTotal: 2047864832
   arch: amd64
   cpus: 2
   hostname: ubuntu-01
   kernel: 4.15.0-42-generic
   os: linux
   rootless: false
   uptime: 2m 5.03s
 insecure registries:
   registries: []
 registries:
   registries:
 docker.io
 registry.fedoraproject.org
 quay.io
 registry.access.redhat.com
 registry.centos.org
 store:
 ConfigFile: /etc/containers/storage.conf
 ContainerStore:
 number: 1
 GraphDriverName: overlay
 GraphOptions: null
 GraphRoot: /var/lib/containers/storage
 GraphStatus:
 Backing Filesystem: extfs
 Native Overlay Diff: "true"
 Supports d_type: "true"
 Using metacopy: "false"
 ImageStore:
 number: 2
 RunRoot: /var/run/containers/storage 

Populate Configuration files

You have to add manually configuration files like registry and policy files.

sudo mkdir -p /etc/containers
sudo curl https://raw.githubusercontent.com/projectatomic/registries/master/registries.fedora -o /etc/containers/registries.conf
sudo curl https://raw.githubusercontent.com/containers/skopeo/master/default-policy.json -o /etc/containers/policy.json

Step 2: Testing Podman Installation on Ubuntu

Download the Alpine docker image by pull command.

podman pull alpine

Type the following command to see the list of downloaded images.

podman images

Podman’s local repository is located in /var/lib/contianers

$ podman  run -it  --rm docker.io/library/alpine /bin/sh
 / # apk update
 fetch http://dl-cdn.alpinelinux.org/alpine/v3.9/main/x86_64/APKINDEX.tar.gz
 fetch http://dl-cdn.alpinelinux.org/alpine/v3.9/community/x86_64/APKINDEX.tar.gz
 v3.9.2-1-g592d872fb8 [http://dl-cdn.alpinelinux.org/alpine/v3.9/main]
 v3.9.2-2-ge7dc3349a9 [http://dl-cdn.alpinelinux.org/alpine/v3.9/community]
 OK: 9754 distinct packages available
 / # apk add vim
  (1/5) Installing lua5.3-libs (5.3.5-r1)
  (2/5) Installing ncurses-terminfo-base (6.1_p20190105-r0)
  (3/5) Installing ncurses-terminfo (6.1_p20190105-r0)
  (4/5) Installing ncurses-libs (6.1_p20190105-r0)
  (5/5) Installing vim (8.1.0630-r0)
  Executing busybox-1.29.3-r10.trigger
  OK: 40 MiB in 19 packages
  / # exit

List the running containers by

podman ls

If you want to learn in more details then check out the below link

How To Run Docker Containers using Podman and Libpod.

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