Maintenance.md

Maintenance

• Read ArchWiki's page on Maintenance to have a good idea on what to do.

• Read Arch Linux News before doing any system upgrade.

• pacaur -Syu

  • Signal on #vps before doing the upgrade, and wait for another member to give you the good sign to upgrade
  • If any error happens, stay calm and wait until a more experienced member(no one) to come and help you
  • DO NOT DO sudo pacman --force -Syu!
  • DO NOT DO pacaur --force -Syu!
  • DO NOT DO sudo pacman -Sy!
  • DO NOT DO pacaur -Sy!

Using systemctl

Don't forget to do sudo systemctl status SERVICE after doing the commands descibred here to check if they actually worked or not.

Writing unit files for systemd

• Enable a service to start on boot

  • sudo systemctl enable SERVICE

• Start a service

  • sudo systemctl start SERVICE

• Stop a service

  • sudo systemctl stop SERVICE

• Restart a service

  • sudo systemctl restart SERVICE

• Important services to check status on

  • Don't even think on stopping them, seriously.
  • sshd, postgres, mongodb, redis, netdata, ntpd

Using PM2

pm2 is a process manager ment for node based applications, but it can be used very easily for python, or even shell scripts.

• start a script
  • pm2 start script.py
• setup your user's pm2 to start at boot
  • pm2 startup
• save your current processes to start at startup
  • pm2 save

you can also create ecosystem files to better control your scripts. here is an example config used to run a program in a virtual environment

module.exports = {
  /**
   * Application configuration section
   * http://pm2.keymetrics.io/docs/usage/application-declaration/
   */
  apps : [

    // First application
    {
      name      : 'memework-status',
      script    : 'memework-status.py',
      interpreter: 'python3.6',
      interpreter_args: '-u'
    },
    {
      name  : 'dog',
      script : 'bot.py',
      interpreter: '/home/pi/shibe-bot/env/bin/python3',
      cwd : '/home/pi/shibe-bot/'
    }
  ]
}

Read the documentation for more information.