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.

SSL/TLS certificate management tools

2 services

certbot systemctl: certbot.timer (renewal timer)

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Automatic HTTPS certificate management. Official Let's Encrypt client.

apt install certbot python3-certbot-nginx python3-certbot-apache

80tcpHTTP-01 challenge443tcpTLS-ALPN-01 challenge

acme.sh systemctl: cron job (installed automatically)

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Pure shell ACME client. Supports Let's Encrypt, ZeroSSL, and other CAs.

curl https://get.acme.sh | sh -s [email protected]

80tcpHTTP-01 (or use DNS-01)