Monit configuration

qna.monit.rc

# Nginx
check process nginx
  with pidfile /run/nginx.pid
  start program = "/bin/systemctl start nginx.service"
  stop program = "/bin/systemctl stop nginx.service"
  if cpu > 60% for 2 cycles then alert
  if cpu > 80% for 5 cycles then restart
  if memory usage > 80% for 5 cycles then restart
  if failed host 127.0.0.1 port 80 protocol http
    then restart
  if 3 restarts within 5 cycles then timeout

# Postgresql
check process postgresql
  with pidfile "/run/postgresql/9.6-main.pid"
  start program = "/bin/systemctl start postgresql.service"
  stop program = "/bin/systemctl stop postgresql.service"
  if failed host localhost port 5432 protocol pgsql then restart
  if cpu > 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 "/run/redis/redis-server.pid"
  start program = "/bin/systemctl start redis-server.service"
  stop program = "/bin/systemctl stop redis-server.service"
  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 > 80% then restart
  if memory usage > 80% for 2 cycles then restart
  if 3 restarts within 3 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 '/usr/bin/pgrep unicorn | /usr/bin/xargs /bin/kill -QUIT'"
  if memory usage > 90% for 3 cycles then restart
  if cpu > 90% for 2 cycles then restart
  if 5 restarts within 5 cycles then timeout

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