If all resources on a node are out of service, LifeKeeper considers it a standby node and calls the node monitoring script. The node monitoring script monitors CPU and memory utilization. If it determines that the node cannot be switched to successfully (due to high CPU or memory load), it sends this information to the administrator by email or SNMP event forwarding. This monitoring is performed at the same interval as the normal LifeKeeper resource monitoring (/etc/default/LifeKeeper setting LKCHECKINTERVAL).

Monitored Resources

The following can be monitored with Node Monitoring:

Resource Name
Monitoring Details
CPU Utilization Check CPU Utilization in /proc/stat file
Memory Utilization Check Memory Utilization in /proc/meminfo file

Node Monitoring Configuration

Set the SNHC_CPUCHECK and SNHC_MEMCHECK settings in the /etc/default/LifeKeeper configuration file. You will also need to configure the following settings. See Standby Node Health Check Parameters List for details.

  • SNHC_CPUCHECK_THRESHOLD
  • SNHC_CPUCHECK_TIME
  • SNHC_MEMCHECK_THRESHOLD
  • SNHC_MEMCHECK_TIME

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