How do I enable persistent logging for the systemd journal (journalctl)?

Question

How do I enable persistent logging for the systemd journal (journalctl)?

Answer

Warning: This configuration file is part of systemd, a core server system. We strongly recommend having a qualified system administrator make the following changes. 

1. Log in to SSH as the root user via SSH or use the Terminal in WHM.

2. Make a backup of the /etc/systemd/journald.conf configuration file.

   # cp -v /etc/systemd/journald.conf{,.$(date +%s)}

3. Open the /etc/systemd/journald.conf configuration file.

   How to edit a file on command line

4. Locate the Strorage line.

   CONFIG_TEXT: #Storage=auto

5. Remove the # from the line and set the value to persistent.

   CONFIG_TEXT: Storage=persistent

6. Save the changes and exit the text editor.

7. Run the following command to load the change into systemd.

   # systemctl daemon-reexec