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# Host networking (Linux only) docker run -d \ --name api-host \ --network host \ -e PORT=3000 \ myapp:latest # Container listens directly on host:3000, no -p needed # Bind to all interfaces (default, publicly accessible) docker run -d -p 3000:3000 myapp:latest # Bind to localhost only (proxied by Nginx) docker run -d -p 127.0.0.1:3000:3000 myapp:latest # Map multiple ports docker run -d \ -p 127.0.0.1:3000:3000 \ -p 127.0.0.1:9229:9229 \ myapp:dev # Random host port (Docker assigns it) docker run -d -p 3000 myapp:latest docker port <container_id> # Inspect port mappings docker ps --format "table {{.Names}}\t{{.Ports}}" docker port api # Fully isolated container (no network) docker run --rm --network none alpine ping google.com
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