What is Nginx default port?

Nginx uses port 80 for HTTP and 443 for HTTPS.

What is MySQL default port?

MySQL uses port 3306 for client connections.

Redis uses port 6379 by default.

Process managers and service supervisors

3 services

supervisor systemctl: supervisor

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Process control system. Manages long-running processes, auto-restart on failure.

apt install supervisor

9001tcpWeb interface (if enabled)

pm2 systemctl: pm2-{user} (after pm2 startup)

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Production process manager for Node.js. Clustering, load balancing, monitoring.

npm install -g pm2

N/AN/AManages app ports, doesn't listen itself

systemd systemctl: systemd (PID 1)

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System and service manager. Default init system for Ubuntu. Manages services, timers, mounts.

Pre-installed on Ubuntu

N/AN/AInit system