Updated: 22 October 2026 · Applies to: cPanel & WHM
This article used to cover installing SIM (System Integrity Monitor), a third-party tool from r-fx.org that watched services such as HTTP, FTP, DNS, SSH and MySQL, restarted them automatically if they went down, and alerted by email. r-fx.org no longer resolves at all, so that download source is gone.
On a cPanel & WHM server, the real current equivalent for exactly this job (service monitoring, automatic restart, email alerts) is built in: WHM's Service Manager, backed by the chkservd daemon. It restarts a monitored service automatically when it detects a failure, and sends failure, recovery and timeout alerts to the contact address set in WHM's Basic WebHost Manager Setup, according to cPanel's own documentation. No third-party install is needed.
Set it up
- In WHM, go to Service Configuration > Service Manager.
- For each service you want monitored, make sure it is enabled, then tick its Monitor checkbox. A service must be enabled before it can be monitored.
- Confirm your alert contact address is set correctly in Basic WebHost Manager Setup, since that is where chkservd's notifications go.
Which services appear in Service Manager depends on your server's configured profile; according to cPanel's documentation, the database service and POP3 are not monitored by default, so check those specifically if you rely on them.
Load-average monitoring
Service Manager covers restarting individual services, but not SIM's separate load-average warning/critical thresholds. If you specifically need a server to react to sustained high load (for example, rebooting automatically past a threshold), see this knowledgebase's script for restarting a server when load passes a limit instead; it covers that specific need directly.
