/etc/monit/conf-enabled/qna.monit.rc

qna.monit.rc

### Nginx ###
check process nginx
  with pidfile "/run/nginx.pid"
  start program = "/usr/sbin/service nginx start"
  stop program = "/usr/sbin/service nginx stop"
  if cpu usage > 60% for 2 cycles then alert
  if cpu usage > 80% for 5 cycles then restart
  if memory usage > 80% for 5 cycles then restart
  if failed host qna.shilov.ru port 80 protocol http then restart
  if 3 restarts within 5 cycles then timeout

### Unicorn ###
check process unicorn
  with pidfile "/home/deployer/qna/shared/tmp/pids/unicorn.pid"
  start program = "/bin/su - deployer -c 'cd /home/deployer/qna/current && /home/deployer/.rvm/bin/rvm default do bundle exec unicorn -c /home/deployer/qna/current/config/unicorn/production.rb -E production -D'"
  stop program = "bin/su - deployer -c 'kill -s QUIT `cat /home/deployer/qna/current/tmp/pids/unicorn.pid`'"
  if cpu usage > 90% for 2 cycles then restart
  if memory usage > 90% for 3 cycles then restart
  if 5 restarts within 5 cycles then timeout

### Postgresql ###
check process postgresql
  with pidfile "/var/run/postgresql/10-main.pid"
  start program = "/usr/sbin/service postgresql start"
  stop  program = "/usr/sbin/service postgresql stop"
  if failed host localhost port 5432 protocol pgsql then restart
  if cpu usage > 80% then restart
  if memory usage > 80% for 2 cycles then restart
  if 5 restarts within 5 cycles then timeout

### Redis ###
check process redis-server
  with pidfile "/var/run/redis/redis-server.pid"
  start program = "/usr/sbin/service redis start"
  stop program = "/usr/sbin/service redis stop"
  if totalmem > 100 Mb then alert
  if children > 255 for 5 cycles then stop
  if cpu usage > 95% for 3 cycles then restart
  if memory usage > 80% for 5 cycles then restart
  if failed host 127.0.0.1 port 6379 then restart
  if 5 restarts within 5 cycles then timeout

### Sidekiq ###
check process sidekiq
  with pidfile "/home/deployer/qna/shared/tmp/pids/sidekiq-0.pid"
  start program = "/bin/su - deployer -c 'cd /home/deployer/qna/current && /home/deployer/.rvm/bin/rvm default do bundle exec sidekiq --index 0 --pidfile /home/deployer/qna/shared/tmp/pids/sidekiq-0.pid --environment production --logfile /home/deployer/qna/shared/log/sidekiq.log --daemon'"
  stop program = "/bin/su - deployer -c 'cd /home/deployer/qna/current && /home/deployer/.rvm/bin/rvm default do bundle exec sidekiqctl stop /home/deployer/qna/shared/tmp/pids/sidekiq-0.pid 10'"
  if cpu usage > 80% then restart
  if memory usage > 80% for 2 cycles then restart
  if 3 restarts within 3 cycles then timeout

### Sphinx ###
check process sphinx
  with pidfile "/home/deployer/qna/shared/tmp/pids/production.sphinx.pid"
  start program = "/bin/su - deployer -c 'cd /home/deployer/qna/current; /home/deployer/.rvm/bin/rvm default do bundle exec rake ts:start RAILS_ENV=production'"
  stop program = "/bin/su - deployer -c 'cd /home/deployer/qna/current; /home/deployer/.rvm/bin/rvm default do bundle exec rake ts:stop RAILS_ENV=production'"
  if cpu usage > 80% for 2 cycles then restart
  if memory usage > 80% for 4 cycles then restart
  if 3 restarts within 3 cycles then timeout