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Fix Docker Compose Networking: Containers Cannot Reach Each Other

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Self-Hosting & Infra intermediate 7 min read $0.01 Updated 2026-10-19

Troubleshooting Docker Compose networking: shared networks and service-name DNS, container port vs published port, localhost inside containers, 0.0.0.0 binding, depends_on health checks, host.docker.internal and firewall interactions.

One container cannot reach another, a service name does not resolve, or a published port does nothing. Check networks, service names, ports vs published ports, bind addresses and startup order.

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#docker#docker-compose#networking#dns#troubleshooting

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