GreenArrow Email Software Documentation

Convert CentOS to Alma Linux

Intro

In December 2020, RedHat announced that they would end support for CentOS 8 on December 31, 2021. CentOS 8 was previously going to remain in support until May 31, 2029.

While there are several binary-compatible alternatives to CentOS, we have identified Alma Linux as the distribution that is the industry replacement for CentOS, and so it is the one we now support.

This document describes the steps to convert your GreenArrow server’s operating system from CentOS 8 to Alma Linux 8.

Prerequisites

Converting CentOS to Alma Linux

The time it takes your conversion to run will depend on the hardware you are running and your familiarity with the required command-line tools, but the process typically took around 15 minutes in our testing.

Here are the steps:

  1. Back up GreenArrow using the unmanaged backup script. We strongly recommend storing a copy at a location external to the server so that you can use it to recover if something goes wrong during the conversion process.

  2. Stop GreenArrow and use hvmail_init to verify that GreenArrow’s services are down.

  3. Use the documentation provided by Alma Linux to convert your CentOS 8 server to Alma Linux 8

  4. Start GreenArrow and use hvmail_init to verify all of GreenArrow’s services are running.

  5. Perform any tests you need to confirm GreenArrow to make sure it is working. The final testing steps in our installation documentation is a good place to start.


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