monit

Introduction

Monit is a utility for managing and monitoring processes, files, directories and filesystems on a Unix system. Monit conducts automatic maintenance and repair and can execute meaningful causal actions in error situations. E.g. Monit can start a process if it does not run, restart a process if it does not respond and stop a process if it uses too much resources. You may use Monit to monitor files, directories and filesystems for changes, such as timestamps changes, checksum changes or size changes.

Installation

monit can be installed with the Pakfire web interface or via the console:

pakfire install monit

Usage

There is a separate web interface and it is not part of the IPFire WebGUI. The monit addon web interface will need to be configured.

Configuration

The monit addon uses a configuration file at /etc/monitrc.

Examples

Monitor clamav virus hits in /var/log/messages

# IPFire - monit control file - clamav virus found
check file clamd-log path /var/log/messages
    if content = ".*instream\(local\).*FOUND" then alert

Monitor ntpd process

# IPFire - monit control file - ntpd
check process ntpd with pidfile /var/run/ntpd.pid
    start program = "/etc/init.d/ntp start"
    stop program = "/etc/init.d/ntp stop"
    if not exist then alert
    if not exist for 2 cycles then restart
    if 3 restarts within 3 cycles then alert

Monitor unbound process

# IPFire - monit control file - unbound
check process unbound with pidfile "/var/run/unbound.pid"
    not every "25-40 1 * * *"
    start program = "/etc/init.d/unbound start"
    stop program = "/etc/init.d/unbound stop"
    if not exist then alert
    if not exist for 2 cycles then restart
    if 3 restarts within 3 cycles then alert

Monitor pmacct process

# IPFire - monit control file - pmacct
check process pmacct matching "pmacctd"
    start program = "/etc/init.d/pmacct start"
    stop program = "/etc/init.d/pmacct stop"
    #restart program = "/etc/init.d/pmacct restart"
    if not exist then alert
    if not exist for 2 cycles then restart
    if 5 restarts within 5 cycles then timeout

Monitor network interfaces

# IPFire - monit control file - green0
check network green0 with interface green0
    if link down then alert

# IPFire - monit control file - blue0
check network blue0 with interface blue0
    if link down then alert

# IPFire - monit control file - orange0
check network orange0 with interface orange0
    if link down then alert

# IPFire - monit control file - red0
check network red0 with interface red0
    if link down then alert

Note - Thank you to Matthias for the clamav and ntpd examples!

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Older Revisions • October 14, 2021 at 9:20 am • Matthias Fischer