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

• https://nodesource.com/blog/running-your-node-js-app-with-systemd-part-1/

• https://blog.codeship.com/running-node-js-linux-systemd/
• https://www.freedesktop.org/software/systemd/man/

That's All

lodolabs@gmail.com