Firewall private port

The most important security consideration is to make sure the private port (default=8374) is firewalled from the public internet. Only peer nodes in the cluster should be able to reach this port.

The RPC server and the maelstrom-component header are not bound to the public port HTTP server, so that is safe to expose publicly.

Trusted code only

Only register code you trust in your maelstrom.yml projects. Since the private port is exposed to running containers they can make RPC requests into the Maelstrom daemon. This is useful in many cases, but poses a security risk.