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Docker health checks can detect when a service stops responding as expected, but they do not automatically restart a container that is still running. For a homelab to recover from that failure, pair a useful HEALTHCHECK with a health-aware controller or host automation; use Docker restart policies separately for containers whose main process exits.
What a Docker health check does—and what it does not do
A Docker HEALTHCHECK runs a command inside a container and records the result as starting, healthy, or unhealthy. Docker marks the container unhealthy after the configured number of consecutive failed checks. The check should test a meaningful readiness or service outcome, not merely whether a process exists. Docker’s Dockerfile reference describes the instruction as a way to test whether a container is still working.
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Health status is not a restart command. A container can remain running while unhealthy, and a standard Docker restart policy does not promise to restart it for that reason. Restart policies such as on-failure and unless-stopped govern Docker’s response when a container exits. Keep those mechanisms distinct when designing recovery. Docker’s restart-policy documentation explains the available policies and their behavior.
Choose a recovery mechanism for the failure you need to handle
| Mechanism | What it detects or acts on | Can act on a running unhealthy container? | Where recovery is controlled | Key trade-off |
|---|---|---|---|---|
| Docker restart policy | Container exit, subject to the selected policy | No, not on health status alone | Docker Engine | Simple for process exits; it does not interpret health checks. |
| Health-aware controller | Health status reported by Docker | Yes, if configured to restart unhealthy containers | An additional service or controller with Docker access | Adds a component and permissions; verify safeguards, logs, and behavior before relying on it. |
| Host automation or process manager | Whatever health signal or condition the automation is configured to monitor | Potentially, if it observes health status and issues a restart | On the Docker host | Flexible, but can conflict with Docker restart policies; Docker cautions against combining them without care. |
For an unhealthy container whose process remains alive, something outside that process must notice the health state and issue a restart—or the application must deliberately exit when it cannot recover. Docker’s health-check and restart-policy documentation describes the underlying primitives, not the reliability or security of any particular third-party controller. Grant only the Docker access the chosen mechanism needs, and determine how it handles repeated failures, restart limits, logging, and dependent services.
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Write a probe that tests useful readiness
Use a lightweight, side-effect-free command that exists in the image and checks the outcome users or dependent services need. Docker’s documentation shows an HTTP check using curl -f against an application page, but that example only works if the image contains curl and the endpoint is a meaningful signal for your service. A process check alone can miss a wedged API, failed database connection, or unavailable application route; an overly broad external check can also mark a healthy container unhealthy because of a dependency beyond its intended scope.
Decide what the check is meant to establish: that the service has initialized, that a local endpoint responds, or that a specific dependency is reachable. A passing probe establishes only that its tested condition passed at that moment; it does not prove every external path or dependent system is working.
Tune timing for the application, not by copying defaults
Docker documents defaults of 30 seconds for interval, 30 seconds for timeout, zero seconds for start_period, five seconds for start_interval, and three consecutive failures for retries. These are documented defaults, not universal homelab recommendations. start_interval requires Docker Engine 25.0 or later, so check the installed Engine version before using it.
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intervalsets how often checks run during normal operation.timeoutlimits how long one check may take before it fails.start_periodgives a slow-starting application time to initialize without treating early failures as ordinary runtime failures.retriessets how many consecutive failures trigger the unhealthy state.start_interval, where supported, sets the check interval during startup.
Shorter intervals and fewer retries can detect a real outage sooner, but may react to transient slowness. Longer settings reduce sensitivity to brief interruptions but delay detection. Base the values on observed startup time and the failure tolerance of the service; do not treat Docker’s defaults or an example configuration as a prescription.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Gate dependent startup with Compose readiness
Compose can wait for a dependency to become healthy before starting a dependent service by using depends_on with condition: service_healthy. This is a startup gate, not a continuing runtime recovery mechanism. Docker notes that Compose otherwise waits for a container to be running, not necessarily ready. The Compose startup-order guide demonstrates this pattern.
Compose’s depends_on option restart: true applies to explicit Compose-controlled dependency updates or restarts; it does not continuously monitor runtime health and restart dependents whenever a dependency becomes unhealthy. Check the Compose version and documentation for the fields you use.
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Docker’s PostgreSQL startup-order example uses a health test with a 10-second interval, 10-second timeout, five retries, and a 30-second start period. Those are example values for that demonstration, not recommended settings for every database or homelab service.
Verify detection and recovery separately
- Inspect the container’s state with
docker inspectand review its recorded health-check output. Confirm the probe is running and that its result reflects the condition you intended to test. - Watch Docker’s
health_statusevents to see when a container changes health state. Docker’s events reference documents the event stream. - Test a controlled probe failure and confirm that Docker records the expected unhealthy state after the configured failures.
- Test the recovery actor separately: confirm it detects the unhealthy state, takes the intended action, logs what happened, and does not create an uncontrolled restart loop.
- Check the dependent-service behavior you actually require. A startup gate does not, by itself, demonstrate recovery from a dependency failure after startup.
Keep Docker’s restart policy for appropriate process-exit cases, and avoid layering host process managers over it without understanding which mechanism wins and how they interact. A health check detects a condition; the restart policy, controller, or application determines what happens next.
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