Apache goes down frequently: mod_watchdog is required

Symptoms

• Apache service goes down frequently

• The following errors can be found in the Apache error log /var/log/httpd/error_log:

  AH03262: mod_watchdog is required
  AH00020: Configuration Failed, exiting

• The following errors can be found in the system log /var/log/messages:

  systemd[1]: httpd.service: Reload operation timed out. Killing reload process.
  Systemd[1]: httpd.service: Failed with result 'exit-code'.

Cause

The watchdog module is required for Apache to work, however it is disabled on the server

Resolution

1. Log into Plesk
2. Go to Plesk > Tools & Settings > Apache Web Server
3. Enable the watchdog Apache module
4. Press OK