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Dockerizing a WebSocket Server
In order to dockerize a WebSocket server, it is necessary to address the issue of localhost-based listening within the Docker environment.
The Problem
When a WebSocket server is configured to listen on localhost:8000, it becomes inaccessible from outside the Docker container. This is because localhost resolves to 127.0.0.1, a loopback address that is not accessible externally.
The Fix
To resolve this issue, the server's listen address must be changed to ":8000", which instructs the server to listen on all of its container's IP addresses. This allows traffic to be forwarded to the container and reach the server.
Additional Information
Docker uses iptables rules to facilitate port forwarding. These rules can be viewed using the following commands:
iptables -n -L iptables -t nat -n -L
By exposing ports in a Docker container, it is possible to create a publicly accessible WebSocket server that can communicate with clients outside the container.
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