A basic monitoring configuration for Monit, running on a server. Notifications will be sent via email.
- A Mail Transfer Agent (MTA) installed on the computer, and listening to port 25. While technically, you could add user names and passwords for SMTP servers to the configuration, we would not recommend to keep credentials scattered across configuration files, unless you’re forced to.
This basic configuration monitors a few essentials:
- System load
- Usage and ownership of the root mount
- Usage and ownership of the /data mount
- Status of the SSH service, including a restart, if necessary
Substitute your own notification emails address for
email@example.com, adapt the script to your context, and save it under
/etc/monit/conf.d/servermonitoring. Then, restart the Monit service.
# Globals # === set mailserver localhost set alert firstname.lastname@example.org # Watchdogs # === # System 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 memory usage > 80% for 4 cycles then alert if swap usage > 60% for 4 cycles then alert if cpu usage (user) > 30% for 4 cycles then alert if cpu usage (system) > 40% for 4 cycles then alert if cpu usage (wait) > 30% for 4 cycles then alert # File systems check filesystem "myserver /" with path / if changed fsflags then alert if space usage > 85% for 2 cycles then alert if inode usage > 50% then alert if failed uid "root" then alert if failed gid "root" then alert if service time > 500 milliseconds for 3 times within 5 cycles then alert check filesystem "myserver /data" with path /data if changed fsflags then alert if space usage > 85% for 2 cycles then alert if space usage < 40% then alert # Mass deletion alert if inode usage > 50% then alert if failed uid "root" then alert if failed gid "root" then alert if service time > 500 milliseconds for 3 times within 5 cycles then alert # Networking check network "myserver LAN" with interface eno1 if failed link then alert if changed link then alert if saturation > 90% then alert if download > 10 MB/s then alert if total uploaded > 10 GB in last hour then alert # SSHD check process "myserver sshd" with pidfile /var/run/sshd.pid start program "/usr/bin/systemctl start ssh.service" stop program "/usr/bin/systemctl stop ssh.service" if failed host 127.0.0.1 port 22 protocol ssh then restart
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