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NodeForever

npm forever is an npm package that spawns separate processes for each Node script.

There are ways to create, list and kill each Node process.

The reason this won't work for us is because we want to be able to do this within the Browser Host, which does not have access to processes.

However, the interface that used by forever could be useful.

In the Cape Code Host, the AccessorSSHCodeGenerator uses forever to manage the Node Host on a remote machine

Resources

Tools

Below is a description of various tools

forever-service

forever-service is a npm module that adds a service that when started will start up on reboot

  • Pros and Cons
    • + Works on the Edison
    • + Adding and deleting is by name and is fairly easy.
    • - Must be run as root

crontab file

Add lines like

  @reboot /usr/local/bin/forever start -c /usr/local/bin/node /your/path/to/your/app.js

to a crontab file.

  • Pros and Cons:
    • + Works as sbuser
    • - old skool
    • - need to enable crontab for the user as root.
    • - need to manage the crontab file and delete lines.

pm2

  • Resources:
  • Commands:
    • Sample command start up command:
        pm2 start ./invoke.js -- RampJSTestDisplay.js
    • Get the log:
        /home/sbuser/cg/node_modules/.bin/pm2 logs invoke
    • Run after reboot:
      sbuser@edison:~/cg/RampJSTestDisplay$ pm2 startup
      [PM2] Init System found: systemd
      [PM2] You have to run this command as root. Execute the following command:
      sudo env PATH=$PATH:/usr/local/node-v6.9.5-linux-x86/bin /home/sbuser/cg/node_modules/pm2/bin/pm2 startup systemd -u sbuser --hp /home/sbuser
      buser@edison:~/cg/RampJSTestDisplay$ pm2 save
      [PM2] Saving current process list...
      [PM2] Successfully saved in /home/sbuser/.pm2/dump.pm2
      sbuser@edison:~/cg/RampJSTestDisplay$
      • During reboot, dmesg returns
        [    2.886162] systemd[1]: Configuration file /etc/systemd/system/pm2.service is marked executable. Please remove executable permission bits. Proceeding anyway.
        The fix is to run sudo chmod a-x /etc/systemd/system/pm2.service and reboot
  • Pros and Cons:
    • + Install with npm
    • + works on Edison
    • - Must run a command as root to make it persistent.
    • + Allows grouping and clustering, has a deployment mechanism.

Issues

Running as Root

The reality is that any thing works across a reboot will require some sort of root activity.

  • crontab requires root enabling crontab for the user
  • pm2 requires running a command

See Also


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Page last modified on February 22, 2017, at 12:59 AM