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Transitioning from Docker to Podman: A Guide for RHEL 7 Users

As a Red Hat Enterprise Linux (RHEL) 7 user, you're likely familiar with Docker and its command-line interface (CLI). However, with the increasing need for enhanced security, unique identifier (UID) separation using namespaces, and integration with systemd, an alternative to Docker containers is gaining popularity. Enter Podman, a daemonless, open-source, Linux-native tool that allows you to develop, manage, and run Open Container Initiative (OCI) containers and pods.

CLI Compatibility with Docker

One of the most significant advantages of Podman is its complete CLI compatibility with Docker. This means you can run familiar commands such as `pull`, `push`, `build`, `commit`, `tag`, and more without having to learn new syntax or functionality. If you're already comfortable using Docker, you'll feel right at home with Podman.

Installing Podman on RHEL 7

To get started with Podman on your RHEL 7 system, simply run the following command:

`sudo yum install podman`

Once installed, you can verify that Podman is working correctly by running the `podman --version` command, which should display the version number of your installed Podman.

Basic Commands and CLI Transition

In this article, we'll explore how to use basic commands in Podman, such as pulling an image from a registry, creating a new container, and setting up port forwarding. We'll also cover how to run an existing image with Podman and provide real-world examples to help you transition seamlessly from the Docker CLI.

Unique Features of Podman

So, what sets Podman apart from Docker? For starters, Podman doesn't require an active container engine for its commands to work. Additionally, it has a similar directory structure to Buildah, Skopeo, and CRI-O, making it easy to integrate with your existing workflow.

Running Podman Online with Katacoda

If you don't have access to a Linux system or prefer to try out Podman online before installing it on your local machine, you can use Katacoda's free online environment. This allows you to experiment with Podman without having to set up a virtual machine or cloud instance.

In conclusion, Podman is an excellent alternative to Docker containers for RHEL 7 users who require increased security, UID separation using namespaces, and integration with systemd. With its complete CLI compatibility with Docker, easy installation process, and unique features, Podman is well worth considering as a replacement or supplement to your existing containerization workflow.

Docker rhel 7