Resource Controller (Cgroups) won't start on a Plesk Server: Error: collectdmng failed: Fail to start sw-collectd!

Symptoms

• An attempt to start the Resource Controller (Cgroups) service in Plesk > Tools & Settings > Services Management, fails with:

  PLESK_ERROR: Error: collectdmng failed: Fail to start sw-collectd!

• After enabling debug mode, the following can be found in /var/log/plesk/panel.log:

  CONFIG_TEXT: DEBUG [util_exec] [d609e363011b8cd5e276bed9c8e76854-0] Starting: collectdmng user-threshold-stdin
  DEBUG [util_exec] [d609e363011b8cd5e276bed9c8e76854-0] Finished in 0.58904s, Error code: 1
  ERR [util_exec] proc_close() failed ['/opt/psa/admin/bin/collectdmng' 'user-threshold-stdin'] with exit code [1]
  ERR [panel] PleskUtilException: '/opt/psa/admin/bin/collectdmng' 'user-threshold-stdin' failed with code 1.

• The system logs for the service sw-collectd has several restarts in a row, leading to a failure:

  # journalctl -u sw-collectd
  systemd[1]: Started Startup script for statistics collecting from Plesk Panel Health Monitor.
  sw-collectd[26224]: plugin_load: plugin "rrdtool" successfully loaded.
  collectd[26224]: plugin_load: plugin "syslog" successfully loaded.
  systemd[1]: Stopping Startup script for statistics collecting from Plesk Panel Health Monitor...
  systemd[1]: sw-collectd.service: Succeeded.
  systemd[1]: Stopped Startup script for statistics collecting from Plesk Panel Health Monitor.
  systemd[1]: sw-collectd.service: Start request repeated too quickly.
  systemd[1]: sw-collectd.service: Failed with result 'start-limit-hit'.
  systemd[1]: Failed to start Startup script for statistics collecting from Plesk Panel Health Monitor.

Cause

The collectd service is failing to start due to systemd rate limiting.

Resolution

As a workaround, disable the rate limiting:

1. Connect to a Plesk server via SSH.
2. Add the following setting to the /lib/systemd/system/sw-collectd.service file:

   CONFIG_TEXT: [Unit]
   StartLimitIntervalSec=0

3. Apply the changes:

   # systemctl daemon-reload

4. Start sw-collectd service:

   # systemctl start sw-collectd

5. Go to Tools & Settings > Services Management > and start Resource Controller (Cgroups)