Ports — Guides | MCSA Guru

Understand Docker networking: bridge vs host vs none, default vs user-defined bridges, container DNS by name, publishing ports, and Compose networks.

Sysadmin Desk Aug 19, 2026 11 min read

Fix Docker's 'bind: address already in use' error: find the listener with ss or lsof, free the port or change the mapping, and bind to 127.0.0.1.

Sysadmin Desk Aug 5, 2026 8 min read

Fix the Docker 'port is already allocated' error: find what's using the port with docker ps, ss, and lsof, then free it or change the mapping.

Sysadmin Desk Jun 13, 2026 8 min read

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