How to migrate from docker containers to podman

migration

 Podman is a daemonless, open source, Linux-native tool designed to develop, manage, and run Open Container Initiative (OCI) containers and pods.  One of Podman's greatest advantages is its complete CLI compatibility with Docker. In fact, when building Podman, Docker users can adapt without any significant changes. 

Migrating from Docker to Podman

Firstly , you need to note few things before migration. There no On the fly approach to migrate a container from docker to Podman. So lets start the Process.

• You need to install Podman.
  https://www.devopszones.com/2022/02/how-to-install-podman-on-oracle-linux-7.html
  https://www.devopszones.com/2021/12/how-to-install-podman-on-oracle-linux-8.html
• The commands that you use with Docker will be the same for Podman.
• Images of Docker is compatible with Podman.

Step 1: Commit your Container. 

It can be useful to commit a container's file changes or settings into a new image. 

[root@podman root]#docker commit <container ID> <Imagename:tag>

Step 2: Save the commited images

[root@podman root]#docker save <Imagename:tag> | gzip > imagename.tar.gz

Step 3: Now copy these Images to the destination podman server.

Step 4: Now Load the image to podman

[root@podman root]#podman load < imagename.tar.gz

[root@podman root]#podman load < ubuntu-app-v13.tar.gz
Getting image source signatures
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Writing manifest to image destination
Storing signatures
Loaded image(s): docker.io/library/ubuntu-app-v13:latest
[root@podman root]#

Step 5: Verify that Image has been uploaded to Podman.

[root@podman root]#podman images
REPOSITORY                                               TAG           IMAGE ID       CREATED          SIZE
docker.io/library/ubuntu-app-v13             latest        c64c20ff4461   4 hours ago      3.35 GB

Step 6:  Now run your Container in podman server.

[root@podman root]#podman run -d ubuntu-app-v13 bash

For removing docker Please follow this blog: https://www.devopszones.com/2021/08/how-to-remove-docker-containers-images.html