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TCP and TLS for remote agents

Local co-located agents keep using a Unix domain socket. Remote agents use TCP. You choose whether that TCP is plain (VPN/LAN) or TLS-wrapped.

Option A — Plain TCP over VPN (recommended for most labs)​

Use Tailscale, WireGuard, or a trusted LAN.

Server

AMUD_AGENT_TCP_LISTEN=0.0.0.0:8050
AMUD_AGENT_SECRET=your-long-shared-secret
# AMUD_AGENT_TLS unset or 0

Agent

AMUD_SERVER_ADDR=100.x.y.z:8050   # or MagicDNS / LAN hostname
AMUD_NODE_TAG=unraid-1
AMUD_AGENT_SECRET=your-long-shared-secret

Do not expose plain TCP port 8050 on the public internet.

Option B — TLS​

Encrypt agent IPC when you cannot rely on a VPN mesh.

Server

AMUD_AGENT_TCP_LISTEN=0.0.0.0:8050
AMUD_AGENT_TLS=1
AMUD_AGENT_TLS_CERT=/opt/amud/certs/agent.crt
AMUD_AGENT_TLS_KEY=/opt/amud/certs/agent.key
AMUD_AGENT_SECRET=your-long-shared-secret

Generate a self-signed cert (example):

openssl req -x509 -newkey rsa:2048 -nodes \
  -keyout agent.key -out agent.crt -days 825 \
  -subj "/CN=amud.lan"

Agent

AMUD_SERVER_ADDR=amud.lan:8050
AMUD_NODE_TAG=pve-2
AMUD_AGENT_SECRET=your-long-shared-secret
AMUD_AGENT_TLS=1
AMUD_AGENT_TLS_CA=/path/to/agent.crt   # or your CA PEM

Lab-only escape hatch (discouraged): AMUD_AGENT_TLS_INSECURE=1 skips certificate verification.

Firewall checklist​

  1. Server listens on 8050 (or your chosen port).
  2. Only VPN/LAN peers can reach it.
  3. Agents use the same port in AMUD_SERVER_ADDR.
  4. Secret matches on every process.

Auth reminder​

IPC still uses challenge–response with AMUD_AGENT_SECRET. TLS protects the transport; the secret still authenticates the agent.