Infrastructure/docker/npm

Nginx Proxy Manager

Runs on the OptiPlex homeserver (192.168.30.20) in ~/npm. Admin UI: http://192.168.30.20:81 (not proxied yet).

Every service gets a name through two entries: a Pi-hole Local DNS record pointing <name>.home.staffenberger.at at 192.168.30.20, and an NPM proxy host forwarding to the real address and port.

Proxy hosts

Name	Scheme	Forward to	Extras
pihole.home.staffenberger.at	http	192.168.30.20:8081	Advanced: redirect / to /admin/
omada.home.staffenberger.at	https	192.168.30.20:8043	Websockets on
ha.home.staffenberger.at	http	192.168.30.20:8123	Websockets on
octoprint.home.staffenberger.at	http	OctoPrint Pi, port 80	Websockets on

All hosts use the wildcard certificate with Force SSL and HTTP/2 on; HSTS is off for now.

Wildcard certificate

Let's Encrypt certificate for *.home.staffenberger.at, issued and renewed by NPM via a DNS challenge at INWX (the names point at internal addresses, so an HTTP challenge can't work, and wildcards need DNS validation anyway).

Add Certificate → Let's Encrypt via DNS → provider INWX, key type ECDSA 256, propagation 120 seconds:

dns_inwx_url = https://api.domrobot.com/xmlrpc/
dns_inwx_username = <sub-user>
dns_inwx_password = """<password>"""

• Uses a dedicated INWX sub-user with minimal rights and no 2FA. NPM stores the password in plain text in its database and credentials file, so ./data and ./letsencrypt are secrets — never commit them, and encrypt any backup.
• Covers exactly one level below home.staffenberger.at; nothing outside *.home is affected.
• If it leaks: change the sub-user's password at INWX and update it in NPM.
• Alternative considered: acme-dns via a CNAME on _acme-challenge.home, limiting the credential to a single TXT record. Possible later, ideally self-hosted on the git server.

Lessons learned

• The Forward Hostname field takes only an IP or host name, never a path. A path there caused a proxy loop (414 Request-URI Too Large).

• The Advanced tab is the gear icon at the top right of the proxy host dialog. Redirect used for Pi-hole:

  location = / {
      return 301 /admin/;
  }
  

• For large OctoPrint uploads, add client_max_body_size 0; in the Advanced tab if needed.

• No MariaDB container — NPM's built-in SQLite is enough at this scale.