solenoid

Jump start an application. solenoid is a binary script that does the following:

solenoid

Jump start an application. solenoid is a binary script that does the following:

  • Start an app: solenoid start -p PIDFILE -u USERNAME -a APP_NAME -v APP_VERSION
  • Stop an app: solenoid stop -p PIDFILE
  • Restart an app: solenoid restart -p PIDFILE

When solenoid starts an application it performs the following operation:

  1. Creates the run direction options.runDir
  2. Creates the solenoid user
  3. Fetches the application snapshot to RUN_DIR/snapshot.tgz
  4. Unpacks the snapshot to RUN_DIR/snapshot/package
  5. Removes the packed snapshot at RUN_DIR/snapshot.tgz
  6. Reads the package.json at RUN_DIR/snapshot/package/package.json
  7. Determines the node engine. Defaults to options.engines.node.default || 0.6.x.
  8. Reads the ENVVARS from -e|--app-env _(if any)_.
  9. Restricts the filesystem to the solenoid user
  10. Gets the uid and gid of the solenoid user
  11. Starts the application using aeternum and forza.
  -u, --app-user     Username of the owner of the application.
  -a, --app-name     Name of the application.
  -v, --app-version  Version of the application.
  -e, --app-env      Environment vars as serialized JSON.
  -p, --pidfile      Location of the pidfile on disk of the aeternum process.

solenoid expects a configuration file $HOME/.solenoidconf with the following options:

{
  "storage": {
    // 
    // Valid pkgcloud storage provider configuration 
    // 
    "provider":  "rackspace",
    "username":  "rackspace-username",
    "apiKey":    "rackspace-apiKey",
    "container": "rackspace-container",
    "region":    "ord"
  },
  "instruments": [
    // 
    // Instruments provider to send metrics and events to. 
    // 
    {
      "host": "127.0.0.1",
      "port": 8556
    }
  ],
  // 
  // Directory to run applications within. 
  // 
  "runDir": "/opt/run"
  "engines": {
    "node": {
      "default": "0.6.x",
      "path": "/opt/engines/node"
    }
  }
}
Authors: Jarrett Cruger, Charlie Robbins