Config files for Monit, specifically for Rails Applications using MySQL

monit_configs.conf

httpd.monitrc

set httpd port 2815 and
    allow #{client_ip}
    allow admin:#{password}
    
mail.monitrc

set mailserver smtp.gmail.com port 587 username "#{smtp_user}" password "#{smtp_passw}" using tlsv1

set mail-format { from: #{mail_from} }
#
#
## You can set alert recipients whom will receive alerts if/when a 
## service defined in this file has errors. Alerts may be restricted on 
## events by using a filter as in the second example below. 
#
set alert #{mail_recipient}

system.httpd

## Check general system resources such as load average, cpu and memory
## usage. Each test specifies a resource, conditions and the action to be
## performed should a test fail.
#
check system #{server_name}
  if memory usage > 90% for 3 cycles then alert
  if cpu usage (system) > 50% for 3 cycles then alert

## Check filesystem permissions, uid, gid, space and inode usage. Other services,
## such as databases, may depend on this resource and an automatically graceful
## stop may be cascaded to them before the filesystem will become full and data
## lost.
#
check filesystem root with path /dev/xvda1
  if space usage > 90% for 3 cycles then alert

check filesystem mnt with path /dev/xvdf1
  if space usage > 90% for 3 cycles then alert
  
mysql.monitrc

check process mysql
  with pidfile /var/run/mysqld/mysqld.pid
  start program = "/usr/sbin/service mysql start"
  stop program = "/usr/sbin/service mysql stop"
  if failed host 127.0.0.1 port 3306 then alert
  if totalmem > 500.0 MB for 5 cycles then alert
  if cpu usage > 90% for 3 cycles then alert
  if 5 restarts within 5 cycles then timeout
  
redis.monitrc

check process redis
  with pidfile /var/run/redis/redis-server.pid
  start program = "/usr/sbin/service redis-server start"
  stop program = "/usr/sbin/service redis-server stop"
  if failed host 127.0.0.1 port 6379 then restart
  if totalmem > 200.0 MB for 5 cycles then restart
  if cpu usage > 90% for 3 cycles then restart
  if 5 restarts within 5 cycles then timeout
  
rails_app.monitrc

check process rails-app
  with pidfile #{path_to_shared_app_directory}/pids/sidekiq.pid
  start program = "/etc/monit/scripts/rails_bundle_exec.sh 'sidekiq -C config/sidekiq.yml'"
  stop program = "/bin/kill `/bin/cat #{path_to_shared_app_directory}/pids/sidekiq.pid`"
  if totalmem > 1024.0 MB for 5 cycles then alert
  if cpu usage > 90% for 3 cycles then alert