foo_delayed_job_production.conf

# /etc/monit/conf.d/avialable/foo_delayed_job_production.conf
#
# Monit configuration for Delayed Job
#
# Delayed job for app foo running as deploy in environment production
#
# Service name: foo_production_delayed_job
#
check process foo_production_delayed_job
    # Checking for a pidfile
    with pidfile /web/production/foo/shared/runit/delayed_job/supervise/pid
    
    # Command to start the service
    start program = "/bin/bash -c '[ ! -h /web/production/foo/shared/runit/delayed_job/run ] || /usr/bin/sv start /web/production/foo/shared/runit/delayed_job'"
    
    # Command to stop the service
    stop program = "/usr/bin/sv -w 12 force-stop /web/production/foo/shared/runit/delayed_job"

    # Alert and restart thresholds for Mem and CPU
    # Delayed job uses about 100 mb for one worker.
    if mem is greater than 115.0 MB for 2 cycles then alert
    if mem is greater than 150.0 MB for 3 cycles then restart
    # The worker can do some intensive background tasks, so allow quite a lot of cpu usage
    # But should finish within 4-5 cycles
    # Limits for catching hanging processes
    if cpu is greater than 90% for 15 cycles then alert
    if cpu is greater than 95% for 20 cycles then restart

    # Replace mail with real mail
    set alert [email protected]

    # Place this in the foo_production group, to make it easier to stop/start all services for given app
    group foo_production

foo_puma_production.conf

# /etc/monit/conf.d/avialable/foo_puma_production.conf
#
# Monit configuration for Puma
#
# Puma for app foo running as deploy in environment production
#
# Service name: foo_production_puma
#
check process foo_production_puma
    # Checking for a pidfile
    with pidfile /web/production/foo/shared/pids/puma.pid
    
    # Command to start the service
    start program = "/bin/bash -c '[ ! -h /web/production/foo/shared/runit/puma/run ] || /usr/bin/sv start /web/production/foo/shared/runit/puma'"
    
    # Command to stop the service
    stop program = "/usr/bin/sv -w 12 force-stop /web/production/foo/shared/runit/puma"

    # Alert and restart thresholds for Mem and CPU
    # Puma uses about 60 mb per worker, and we have 2 workers. 
    # Total 135 mb should be enough, if not, something is wrong, do alert!
    if mem is greater than 150.0 MB for 2 cycles then alert
    if mem is greater than 175.0 MB for 3 cycles then restart
    if cpu is greater than 90% for 2 cycles then alert
    if cpu is greater than 95% for 5 cycles then restart

    # Replace mail with real mail
    set alert [email protected]

    # Place this in the foo_production group, to make it easier to stop/start all services for given app
    group foo_production

monit commands to administer

# All monit services will start when the system starts
# You can enable/disable service by adding/removing services from:
# /etc/monit/conf.d/enabled

# Enable all services in the group
monit -g foo_production monitor

# Disable monitoring for the group
monit -g foo_production unmonitor

# Starting/stopping/restarting all services in the group
monit -g foo_production start
monit -g foo_production stop
monit -g foo_production restart

# Global commands
monit reload  # reloads config
monit status
monit validate
monit summary

# Starting/stopping particular services 
# example for foo_production_puma
monit foo_production_puma start
monit foo_production_puma stop
monit foo_production_puma restart
monit foo_production_puma monitor
monit foo_production_puma unmonitor

monitrc

# Global monit configuration
# /etc/monit/monitrc
#
set daemon 60
  with start delay 60

set logfile syslog facility log_daemon

set mailserver localhost

set eventqueue
    basedir /var/monit  # set the base directory where events will be stored
#    slots 1000          # optionaly limit the queue size

set mail-format {
  from: monit@$HOST
  subject: $SERVICE $EVENT $HOST
  message: Monit $ACTION $SERVICE at $DATE on $HOST: $DESCRIPTION.
}

set httpd port 2812
  use address localhost
  allow localhost
  signature enable

include /etc/monit/conf.d/enabled/*.conf