ecosystem.json

{
  // Applications part
  "apps": [{
      "name": "API",
      "script": "app.js",
      "env": {
          "COMMON_VARIABLE": "true"
      },
      // Environment variables injected when starting with --env production
      // http://pm2.keymetrics.io/docs/usage/application-declaration/#switching-to-different-environments
      "env_production": {
          "NODE_ENV": "production"
      }
  }, {
      "name": "WEB",
      "script": "web.js"
  }],
  // Deployment part
  // Here you describe each environment
  "deploy": {
      "production": {
          "user": "node",
          // Multi host is possible, just by passing IPs/hostname as an array
          "host": ["212.83.163.1", "212.83.163.2", "212.83.163.3"],
          // Branch
          "ref": "origin/master",
          // Git repository to clone
          "repo": "git@github.com:repo.git",
          // Path of the application on target servers
          "path": "/var/www/production",
          // Can be used to give options in the format used in the configura-
          // tion file.  This is useful for specifying options for which there
          // is no separate command-line flag, see 'man ssh' 
          // can be either a single string or an array of strings
          "ssh_options": "StrictHostKeyChecking=no",
          // To prepare the host by installing required software (eg: git) 
          // even before the setup process starts
          // can be multiple commands separated by the character ";"
          // or path to a script on your local machine
          "pre-setup": "apt-get install git",
          // Commands / path to a script on the host machine
          // This will be executed on the host after cloning the repository
          // eg: placing configurations in the shared dir etc
          "post-setup": "ls -la",
          // Commands to execute locally (on the same machine you deploy things)
          // Can be multiple commands separated by the character ";"
          "pre-deploy-local": "echo 'This is a local executed command'"
              // Commands to be executed on the server after the repo has been cloned
          "post-deploy": "npm install && pm2 startOrRestart ecosystem.json --env production"
              // Environment variables that must be injected in all applications on this env
          "env": {
              "NODE_ENV": "production"
          }
      },
      "staging": {
          "user": "node",
          "host": "212.83.163.1",
          "ref": "origin/master",
          "repo": "git@github.com:repo.git",
          "path": "/var/www/development",
          "ssh_options": ["StrictHostKeyChecking=no", "PasswordAuthentication=no"],
          "post-deploy": "pm2 startOrRestart ecosystem.json --env dev",
          "env": {
              "NODE_ENV": "staging"
          }
      }
  }
}