Bitnami Monit

Monit is a free open source utility for managing and monitoring, processes, programs, files, directories and filesystems on a UNIX system. Monit conducts automatic maintenance and repair and can execute meaningful causal actions in error situations.

How to check Monit configuration?

Check server status with the following command:

$ sudo monit status

At this point you should see the servers that Monit is monitoring and the machine statistics:

The Monit daemon 5.5.1 uptime: 1d 19h 35m 
Process 'mysql'
  status                            Running
  monitoring status                 Monitored
  pid                               27154
  parent pid                        26893
  uptime                            1m 
  children                          0
  memory kilobytes                  38428
  memory kilobytes total            38428
  memory percent                    0.2%
  memory percent total              0.2%
  cpu percent                       0.0%
  cpu percent total                 0.0%
  data collected                    Thu, 15 Aug 2013 13:39:06
Process 'apache'
  status                            Running
  monitoring status                 Monitored
  pid                               27205
  parent pid                        1
  uptime                            1m 
  children                          8
  memory kilobytes                  13500
  memory kilobytes total            86504
  memory percent                    0.0%
  memory percent total              0.5%
  cpu percent                       0.0%
  cpu percent total                 0.0%
  data collected                    Thu, 15 Aug 2013 13:39:06
System 'desktop'
  status                            Running
  monitoring status                 Monitored
  load average                      [0.14] [0.21] [0.22]
  cpu                               0.9%us 0.7%sy 0.0%wa
  memory usage                      7113496 kB [43.5%]
  swap usage                        182008 kB [1.1%]
  data collected                    Thu, 15 Aug 2013 13:39:06

Monit also includes a small Web application to manage the servers. It only works from localhost by default but you can add other IP addresses in the /opt/bitnami/config/monit/bitnami.conf configuration file:

# Bitnami configuration file for Monit.
set httpd port 2812 and
    use address localhost
    allow localhost
include /opt/bitnami/config/monit/conf.d/*.conf 

The Monit Server Manager can be accessed at http://SERVER-IP:2812 and looks like this:

Monit manager

How to configure my server with Monit?

You can find all Monit configuration files for the Bitnami servers in the /opt/bitnami/config/monit/conf.d folder. For example, the Apache Monit config file looks like this:

check process apache with pidfile "/opt/bitnami/apache2/logs/httpd.pid" start program = "/opt/bitnami/apache2/scripts/ctl.sh start" with timeout 90 seconds stop program = "/opt/bitnami/apache2/scripts/ctl.sh stop"

As you can see in the above example, it is only necessary to specify the PID file location and the commands to start/stop the server. You can find more configuration options at the Monit documentation.

Once you create your own config file for your server, add it to the same folder. To reinitialize Monit, run the following command:

$ sudo monit reload

How to disable Monit?

To disable a server, run the following command to disable it. For example, to disable the Apache server:

$ sudo monit unmonitor apache

You can also stop the Monit process with the following command:

$ sudo monit quit

How to enable Monit?

Recent versions of Bitnami stacks ship Monit configuration files for all servers. On cloud servers and virtual machines, Monit is already configured and enabled by default.

virtualMachine

Bitnami Documentation