Troubleshooting guide
Docker Container Keeps Restarting: Causes, Checks and Fixes
A practical guide to Docker containers that keep restarting, including logs, restart policies, environment variables, health checks, volumes and dependency failures.
DockerDocker Composecontainer logsrestart loopsproduction support
What this problem usually means
A container restart loop usually means the process inside the container is exiting, failing health checks, losing a dependency, or starting with the wrong configuration. In production, the priority is to understand why it exits before repeatedly rebuilding or restarting services.
Production caution: Do not keep forcing restarts on a production service without checking logs and storage first. If the issue is a database or volume problem, repeated restarts can make recovery harder.
Common symptoms
- Container status shows Restarting or Exited
- Application is briefly available then disappears
- CPU or disk usage spikes during restart loops
- Reverse proxy returns 502, 503 or connection refused
- Logs repeat the same startup error
Common causes
- Application process exits because of a missing environment variable
- Volume permissions prevent the app from writing required files
- Database, Redis or another dependency is unavailable
- Port conflicts or reverse proxy misconfiguration
- Bad image tag or incompatible upgrade
- Health check command fails even though the service is partly running
Safe first checks
These checks are intended to help identify the direction of the issue. Always adjust paths, service names and commands for your environment.
Check recent logs
docker logs --tail=120 container_nameInspect restart count and exit code
docker inspect container_name --format "{{.RestartCount}} {{.State.ExitCode}} {{.State.Error}}"Check Compose service state
docker compose psCheck resource pressure
df -h && free -m && docker stats --no-streamTypical fixes
- Pin image versions before upgrading production services
- Check .env values and secrets after deployments
- Confirm volumes are mounted where the app expects them
- Fix file ownership and permissions on persistent data
- Start dependencies first and verify network aliases
- Use restart policies carefully so they do not hide a broken deploy
When to get help
Get help if the system is production-facing, customer data is involved, backups are uncertain, or the issue affects revenue, security or uptime. We can review the logs, confirm the cause and quote a fixed-scope fix where appropriate.
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