Capfile / monit file for a node project

Capfile

require 'cgi'

role :server, "1.2.3.4", "5.6.7.8"

set :repo, "git@github.com:whatever/project.git"
set :destpath, "/home/myuser/project"
set :user, "myuser"
set :ssh_options, { :forward_agent => true }

after "deploy", "restart"
after "deploy", "airbrake_deploy_msg"

desc "Deploy project to production"
task :deploy, :roles => :server do
  run "mkdir -p #{destpath}/shared/node_modules"
  run "mkdir -p #{destpath}/shared/logs"
  run "mkdir -p #{destpath}/releases"
  newpath = "#{destpath}/releases/#{Time.now.strftime('%Y%m%d%H%M%S')}"
  run "git clone --depth 1 #{repo} #{newpath}"
  run "rm -f #{destpath}/current && ln -s #{newpath} #{destpath}/current"
  run "ln -s #{destpath}/shared/node_modules #{destpath}/current/node_modules"
  run "chmod 0700 #{destpath}/current/monitrc"
  # we can delete old crap now, though next line doesn't seem to work any more
  # run "find #{destpath}/releases -mtime +14 -delete"
end

desc "Tell airbrake we just deployed"
task :airbrake_deploy_msg do
  msg = CGI::escape((`git log -n 1 --oneline`).strip)
  url = "http://errors.somepath.com/deploys.txt?api_key=secret"
  url+= "&deploy[rails_env]=production&deploy[scm_repository]=git@github.com:something.git"
  url+= ("&deploy[local_username]=" + `whoami`).strip
  url+= "&deploy[message]=" + CGI::escape((`git log -n 1 --oneline`).strip)
  `wget "#{url}" -O - -q`
end

desc "Restart node"
task :restart, :roles => :server do
  stop
  start
end

desc "Stop node"
task :stop, :roles => :server do
  pidfile = "#{destpath}/shared/monit.pid"
  run "test ! -f #{pidfile} || (kill -QUIT $(cat #{pidfile}) && rm #{pidfile})"

  pidfile = "#{destpath}/shared/node.pid"
  run "test ! -f #{pidfile} || (kill -KILL $(cat #{pidfile}) && rm #{pidfile})"
end

desc "Start node"
task :start, :roles => :server do
  run "cd #{destpath}/current && npm install"

  pidfile = "#{destpath}/shared/node.pid"
  run "cd #{destpath}/current && /usr/bin/node lib/main.js production #{pidfile} > /dev/null 2>&1 &"

  pidfile = "#{destpath}/shared/monit.pid"
  run "monit -d 5 -c #{destpath}/current/monitrc"
end

monitrc

set logfile /home/project/shared/shared/logs/monit.log
set pidfile /home/project/shared/shared/monit.pid
set alert anemailaddess@gmail.com
set mailserver smtp.gmail.com port 587 username "noreply@mydomain.com" password "secret" using tlsv1 with timeout 30 seconds

check process exguard with pidfile "/home/user/project/shared/node.pid"
      start program = "/usr/bin/node /home/user/project/current/lib/main.js production /home/user/project/shared/node.pid > /dev/null 2>&1"
      stop program = "/bin/bash -c 'kill -KILL $(cat /home/user/project/shared/node.pid)' && rm -f /home/user/project/shared/node.pid"
      if failed port 8080 protocol HTTP request / with timeout 5 seconds then restart
      if failed port 8080 protocol HTTP request / with timeout 5 seconds then alert
      if memory is greater than 60% for 3 cycles then restart
      if memory is greater than 60% for 3 cycles then alert
      if cpu is greater than 60% for 3 cycles then restart
      if cpu is greater than 60% for 3 cycles then alert