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Fix Docker Compose Port Already Allocated on Linux - Docker Compose Env Var Troubleshooting-Fix Nginx 502 Bad Gateway with Docker Multiple Containers

Updated 2026-07-28 04:23:01cloud-software

Fix Docker Compose Port Already Allocated on Linux - Docker Compose Env Var Troubleshooting-Fix Nginx 502 Bad Gateway with Docker Multiple Containers

Likely symptom

Likely cause

Safe rollback

Verification route

Repeat the original action, not only a simplified test case.
Restart the app or reload the service after configuration changes.