Monit configurations for common web server services.

monit-base.conf

set daemon  120           	# check services at 2-minute intervals
with start delay 240  		# optional: delay the first check by 4-minutes
    
set mailserver localhost

set alert user@email.com

# set alert manager@foo.bar only on { timeout }  # receive just service-
#                                                # timeout alert

# system
check system $HOST
   if loadavg (1min) > 5 then alert
   if loadavg (5min) > 3 then alert
   if memory usage > 75% then alert
   #if memory usage > 80% for 4 cycles then alert
   #if swap usage > 20% for 4 cycles then alert
   if cpu usage (user) > 70% then alert
   if cpu usage (system) > 30% then alert
   if cpu usage (wait) > 20% then alert
  
# httpd
check process httpd with pidfile /var/run/httpd/httpd.pid
   group www
   start program = "/etc/init.d/httpd start"
   stop program  = "/etc/init.d/httpd stop"
   if failed port 80 protocol http then alert
   if 3 restarts within 5 cycles then timeout
   
## php-fpm
check process php-fpm with pidfile /var/run/php-fpm/php-fpm.pid   
   group www
   start program = "/etc/init.d/php-fpm start"
   stop program  = "/etc/init.d/php-fpm stop"
   #if failed unixsocket /var/run/php-fpm/oas.sock ...
   #if totalmem > 500 MB for 5 cycles then restart
   #if children > 250 then restart
  
# mysql
check process mysqld with pidfile /var/run/mysqld/mysqld.pid
   group database
   start program = "/etc/init.d/mysqld start"
   stop program = "/etc/init.d/mysqld stop"
   if failed host 127.0.0.1 port 3306 then restart
   if 5 restarts within 5 cycles then timeout

# tomcat
check process tomcat with pidfile /var/run/tomcat6.pid
  group birt
  start program = "/etc/init.d/tomcat6 start" 
  stop program = "/etc/init.d/tomcat6 stop" 
  if failed port 8080 then alert
  if failed port 8080 for 5 cycles then restart

# nginx
#check process nginx with pidfile /opt/nginx/logs/nginx.pid
#  start program = "/etc/init.d/nginx start"
#  stop  program = "/etc/init.d/nginx stop"
#  if failed host 127.0.0.1 port 80 then restart
#  if cpu is greater than 40% for 2 cycles then alert
#  if cpu > 60% for 5 cycles then restart 
#  if 10 restarts within 10 cycles then timeout

# redis
#check process redis with pidfile /var/run/redis.pid
#  start program = "/etc/init.d/redis-server start"
#  stop program = "/etc/init.d/redis-server stop"
#  group redis

#check file dump.rdb with path /var/lib/redis/dump.rdb
#  if size > 100 MB then alert