Monit on Debian

Discussion in 'Tips/Tricks/Mods' started by Hans, Oct 6, 2008.

  1. Hans

    Hans Moderator Moderator HowtoForge Supporter ISPConfig Developer

    Monit checks the availability of services on your server and takes the appropriate action such as a restart if it finds a service is not behaving as expected.
    If you add/replace the following configuration to your /etc/monit/monitrc file, you can almost monitor any service on your Debian Etch server :) :

    Code:
    # Apache2
    check process apache with pidfile /var/run/apache2.pid
       group www
       start program = "/etc/init.d/apache2 start"
       stop program  = "/etc/init.d/apache2 stop"
       if failed host [COLOR="Red"]monitor.example.com[/COLOR] port 80 protocol http
          and request "/monit/token" then restart
       if cpu is greater than 60% for 2 cycles then alert
       if cpu > 80% for 5 cycles then restart
       if totalmem > [COLOR="Red"]700[/COLOR] MB for 5 cycles then restart
       if children > 500 then restart
       if loadavg(5min) greater than 10 for 8 cycles then stop
       if 3 restarts within 5 cycles then timeout
    
    # Courier_authdaemon
    check process authdaemon with pidfile /var/run/courier/authdaemon/pid
       group services
       start program = "/etc/init.d/courier-authdaemon start"
       stop  program = "/etc/init.d/courier-authdaemon stop"
       if 5 restarts within 5 cycles then timeout
    
    # Bind
    check process bind9 with pidfile /var/lib/named/var/run/bind/run/named.pid
       group bind
       start program = "/etc/init.d/bind9 start"
       stop  program = "/etc/init.d/bind9 stop"
       if failed port 53 then restart
       if 5 restarts within 5 cycles then timeout
       if failed port 53 then restart
       if 5 restarts within 5 cycles then timeout
    
    # Cron
    check process cron with pidfile /var/run/crond.pid
       start program = "/etc/init.d/cron start"
       stop  program = "/etc/init.d/cron stop"
       group system
       depends cron_init, cron_bin
    check file cron_init with path /etc/init.d/cron
       group system
    check file cron_bin with path /usr/sbin/cron
       group system
    
    # Courier_imapd
    check process imap with pidfile /var/run/courier/imapd.pid
       group mail
       start program = "/etc/init.d/courier-imap start"
       stop  program = "/etc/init.d/courier-imap stop"
       if failed port 143 then restart
       if 5 restarts within 5 cycles then timeout
    
    # Courier_immapd-ssl
    check process imapd-ssl with pidfile /var/run/courier/imapd-ssl.pid
       group mail
       start program = "/etc/init.d/courier-imap-ssl start"
       stop  program = "/etc/init.d/courier-imap-ssl stop"
       if failed port 143 then restart
       if 5 restarts within 5 cycles then timeout
    
    # Munin-node
    check process munin-node with pidfile /var/run/munin/munin-node.pid
       group services
       start program = "/etc/init.d/munin-node start"
       stop  program = "/etc/init.d/munin-node stop"
       if 5 restarts within 5 cycles then timeout
    
    # MySQL
    check process mysql with pidfile /var/run/mysqld/mysqld.pid
       group database
       start program = "/etc/init.d/mysql start"
       stop  program = "/etc/init.d/mysql stop"
       if failed host 127.0.0.1 port 3306 then restart
       if failed unix "/var/lib/mysql/mysql.sock" then restart
       if 5 restarts within 5 cycles then timeout
       depends mysqld_init
       depends mysqld_bin
       depends mysqldsafe_bin
    check file mysqld_init with path /etc/init.d/mysql
       group database
    check file mysqld_bin with path /usr/sbin/mysqld
       group database
    check file mysqldsafe_bin with path /usr/bin/mysqld_safe
       group database
    
    # Postfix
    check process postfix with pidfile /var/spool/postfix/pid/master.pid
       group mail
       start program = "/etc/init.d/postfix start"
       stop  program = "/etc/init.d/postfix stop"
       if failed port 25 protocol smtp then restart
       if 5 restarts within 5 cycles then timeout
       depends on postgrey
    
    # Postgrey
    check process postgrey with pidfile /var/run/postgrey.pid
            group postgrey
            start program = "/etc/init.d/postgrey start"
            stop  program = "/etc/init.d/postgrey stop"
    
    # Courier_pop3d
    check process pop3 with pidfile /var/run/courier/pop3d.pid
       group mail
       start program = "/etc/init.d/courier-pop start"
       stop  program = "/etc/init.d/courier-pop stop"
       if failed port 110 then restart
       if 5 restarts within 5 cycles then timeout
    
    # Courier_pop3-ssl
    check process pop3-ssl with pidfile /var/run/courier/pop3d-ssl.pid
       group mail
       start program = "/etc/init.d/courier-pop-ssl start"
       stop  program = "/etc/init.d/courier-pop-ssl stop"
       if failed port 995 then restart
       if 5 restarts within 5 cycles then timeout
    
    # ProFTPd
    check process proftpd with pidfile /var/run/proftpd.pid
       start program = "/etc/init.d/proftpd start"
       stop program  = "/etc/init.d/proftpd stop"
       if failed port 21 protocol ftp then restart
       if 5 restarts within 5 cycles then timeout
    
    # SSHd
    check process sshd with pidfile /var/run/sshd.pid
       start program  "/etc/init.d/ssh start"
       stop program  "/etc/init.d/ssh stop"
       if failed port 22 protocol ssh then restart
       if 5 restarts within 5 cycles then timeout
    
    # Syslogd
    check process syslogd with pidfile /var/run/syslogd.pid
       start program = "/etc/init.d/sysklogd start"
       stop program = "/etc/init.d/sysklogd stop"
       if 5 restarts within 5 cycles then timeout
    check file syslogd_file with path /var/log/syslog
    If you decide to copy and paste it into your monitrc file, the services will appear in alphabetical order within the monit application.
    Don't forget to replace monitor.example.com with your own domain name.
    Also change 700 on the line "if totalmem > 700 MB for 5 cycles then restart" in a suitable value for you.

    Of course, only configure the services you've running on your server.
    So for example, if you don't run postgrey, please don't mention it within your monitrc file.

    The syntax within the monitrc file can be verified by executing the command: monit -t
    After changing your monitrc file, restart monit with the command: /etc/init.d/monit restart
     

    Attached Files:

    Last edited: Oct 6, 2008
  2. edge

    edge Active Member Moderator HowtoForge Supporter

  3. Hans

    Hans Moderator Moderator HowtoForge Supporter ISPConfig Developer

    @Edge,
    Thank you for that information.
    I will make notice of that as well.
     

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