NodeJS + systemd

NodeJS + systemd

or 

 

There's more to life than nodemon

systemd - process #1

systemd

  • modeled on macos launchd
  • runs services
  • handles mountpoints
  • process management via cgroups
  • replaces syslog with journald
  • recently adding basic network managment

Why systemd

because it's THERE

Why systemd

prod != dev

systemd

configured via UNITS

  • .service, .socket
  • .network, .link, .netdev
  • .device, .mount, automount, .swap
  • .target
  • .path
  • .timer
  • .scope, .slice

Ephemeral Jobs

systemd-run --description="ls as a systemd.service" --unit="ls.service" ls -la /usr/lib/systemd
journalctl -u "ls.service"

Socket Activation

[Unit]
Description=Rsync Socket
Conflicts=rsyncd.service

[Socket]
ListenStream=873
Accept=true

[Install]
WantedBy=sockets.target

Socket Activation

[Unit]
Description=A file transfer program to keep remote files in sync
After=network.target

[Service]
ExecStart=/usr/bin/rsync --daemon --no-detach
RestartSec=1

[Install]
WantedBy=multi-user.target

Your First Service

[Unit]
Description=hello_env.js - making your environment variables rad
Documentation=https://example.com
After=network.target

[Service]
Environment=NODE_PORT=3001
Type=simple
User=ubuntu
ExecStart=/usr/bin/node /home/ubuntu/hello_env.js
Restart=on-failure

[Install]
WantedBy=multi-user.target

Your First Service

(better)

[Unit]
Description=hello_env.js - making your environment variables rad
Documentation=https://example.com
After=network.target

[Service]
Environment=NODE_PORT=3001
Type=simple
User=ubuntu
ExecStart=/usr/bin/node /srv/node/ubuntu/hello_env.js
Restart=on-failure

[Install]
WantedBy=multi-user.target

That's All

That's All

lodolabs@gmail.com

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