Updating RHEL with repo access (dont remove docker)

⚠ WARNING: SYSTEM DOWNTIME REQUIRED
The update process will cause system downtime. This should be scheduled to avoid interrupting users of the Secura Video System.

Overview

This guide explains how to safely update a Red Hat Enterprise Linux (RHEL) system using dnf while preventing RHEL from replacing Docker with Podman.

Prerequisites

• You need SSH access to the RHEL system. Alternatively, these commands can be run directly on the server.
• The username is pesa, which already has sudo privileges.

Step-by-Step Instructions

1. Connect to the RHEL System via SSH

On your local machine, open a terminal and connect to the remote RHEL system: 

$ ssh pesa@your-server-ip Replace your-server-ip with the IP address or hostname of the server.

2. Update the System with dnf

Run the following command to update all installed packages while preventing RHEL from replacing Docker with Podman: 

$ sudo dnf update --nobest

IMPORTANT: Review the list of packages before proceeding. Ensure that Docker is not listed for removal. If Docker appears in the removal list, do not proceed and investigate why it is being removed.

3. Reboot the System

A reboot must be performed after the update to ensure all changes take effect: 

$ sudo reboot

4. Verify That Docker is Still Installed

After the system comes back online, reconnect using SSH: $ ssh pesa@your-server-ip Then, check the installed Docker version:

$ docker --version

5. Verify That Containers Are Running

Since Docker Compose is configured to automatically start containers on boot, check if the containers are running with: 

$ docker ps 

You should see a list of running containers.