docker-troubleshoot
Troubleshoot Docker Compose startup errors. Use when encountering network conflicts, container name collisions, orphaned containers, or other Docker setup issues.
What this skill does
# Docker Troubleshooting ## Common Issues and Fixes ### 1. Network Subnet Conflict **Error message:** ``` failed to create network: Error response from daemon: invalid pool request: Pool overlaps with other one on this address space ``` **Cause:** The subnet defined in docker-compose conflicts with an existing Docker network. **Fix:** 1. Open `docker-compose.dev.yml` 2. Find the `networks` section at the bottom 3. Change the subnet to an unused range (e.g., `172.28.0.0/16` instead of `172.20.0.0/16`) 4. Update all `ipv4_address` values for each service to match the new subnet **Alternative:** Clean up unused networks with: ```bash docker network prune ``` ### 2. Container Name Already in Use **Error message:** ``` Error response from daemon: Conflict. The container name "/container-name" is already in use ``` **Cause:** Orphaned containers from a previous run weren't cleaned up properly. **Fix:** Remove the conflicting containers: ```bash docker rm -f postgres-dev migrate-dev server-dev web-dev nginx-dev ``` Or remove all stopped containers: ```bash docker container prune ``` ### 3. Full Cleanup When Docker state is severely corrupted: ```bash docker stop $(docker ps -aq) docker rm $(docker ps -aq) docker network rm caliber-fleet-management_app_network docker system prune -f ``` ## Diagnostic Commands ```bash docker ps -a # List all containers docker network ls # List all networks docker network inspect <name> # Inspect network subnet ```
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