Monit

Monit is a free, open-source process supervision tool for Unix and Linux. Monit can restart a process automatically if process dies or monitor process characteristics, such as memory or cpu cycles and alert or execute and action. Monit only support alert messages by email.

• Installation macOS: brew install monit
• Linux: apt install monit
• Access: http://localhost:2812/ (admin/monit)

• Config file: /etc/monit/monitrc (monit -t) to verify configuration file

set daemon 120 By default configured to check services every 120 seconds

Review examples: https://mmonit.com/wiki/Monit/ConfigurationExamples

• Logs: /var/log/monit.log
• Command: monit status
• Restart Monit service: systemctl restart monit.service && systemctl status monit

Example

/etc/monit/monitrc

#  check system $HOST
#    if loadavg (1min) per core > 2 for 5 cycles then alert
#    if loadavg (5min) per core > 1.5 for 10 cycles then alert
#    if cpu usage > 95% for 10 cycles then alert
#    if memory usage > 75% then alert
#    if swap usage > 25% then alert

Related commands

• logcheck
• glances

See also

• monit, monit -t, monit status, /etc/monit/monitrc
• Monitoring: Prometheus, Cacti, monit, munin, RRDtool, Zabbix, Netdata, Nagios, Check MK, Icinga, Pingdom, OpsGenie and Datadog, Opsgenie, PRTG, Checkmk
• Monitoring: On call, Monitoring software, Monitoring services, Resource monitoring, Metric colletion tools, network monitoring, SLA Management Monitoring Tools, Alarm/Alert, Resource starvation, Alerts and notifications, Monitoring Kubernetes, VictoriaMetrics, Sensu, LogicMonitor, Distributed tracing, Datadog Monitors

https://mmonit.com/monit/documentation/monit.html#ALERT-MESSAGES