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Set a Coolify health check from the application’s Healthcheck page, choose HTTP or CMD, enter a command or an internal URL, configure the timing values, select Save changes, then Enable the check. Restart or redeploy an already-running application so Coolify recreates its container with the new configuration.
The probe runs inside the application container, not from your browser or the deployment server. Therefore, the health-check client (curl or wget) must exist in the final image, and the URL must use the container’s listening port rather than a public or host-mapped port.
What a Coolify health check does
A health check is a repeated command that tells Docker and Coolify whether a container is ready to serve requests. A passing check keeps the container eligible for traffic. A failing check eventually marks it unhealthy, allowing the proxy and deployment logic to stop sending requests to it.
For an HTTP check, Coolify executes a request from inside the container. A typical probe is curl --fail http://localhost:3000/health. The command must finish successfully (exit code 0). The endpoint should be lightweight, available without changing application data, and report success only after the process can actually handle requests.
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Health checks are separate from external monitoring. An external monitor tests the public route from outside the server; a Coolify check tests the container’s local readiness. Both can be useful, but they answer different questions.
Choose where the check is defined
Your application type determines which configuration owns the check. Use one of these locations rather than combining them indiscriminately.
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|---|---|---|---|
| Coolify Healthcheck page | Nixpacks, Railpack, Static, Dockerfile, and Docker Image applications | Coolify application configuration | Changing a running container requires a restart or redeploy. HTTP checks need curl or wget in the image. |
Dockerfile HEALTHCHECK |
A probe that should travel with the image wherever it is deployed | The image author | Every referenced executable must be present in the final image. For a non-Compose Dockerfile application, an image-provided check takes precedence over a dashboard-generated check. |
Compose healthcheck |
Multi-service Docker Compose applications | The individual Compose service definition | Compose applications do not use the standard application Healthcheck page. Define a check separately for each service that needs one. |
If an optional Compose service should not determine the overall service health, Coolify documents the exclude_from_hc: true setting for that service.
Prepare a reliable readiness endpoint
Return success only when the app is ready
Create an endpoint such as /health or /ready that responds only when the server process is ready to accept traffic. If your application performs migrations, loads a cache, or waits for another required dependency during startup, do not report healthy before that work is complete.
Keep this endpoint fast and side-effect-free. It should not create records, send emails, trigger jobs, or mutate application state. A probe can run repeatedly, so any side effect may occur many times.
Use the container’s network address and port
In most cases, use localhost (or 127.0.0.1) and the port on which the process listens inside the container. Do not use the public domain name, a reverse-proxy port, or a host-published port. For an app listening internally on port 3000, the request is usually:
curl --fail http://localhost:3000/healthThe port in this command must match the value you enter in Coolify or the command in your Dockerfile or Compose file. A host mapping such as 8080:3000 does not mean the probe should use port 8080 from inside the container; the process is still reached at 3000 internally.
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Make the client available in the final image
Coolify does not run an HTTP probe on the deployment server and then report that result to the container. The command executes in the running image. Install curl or wget in that image, and verify it is still present after the production build stage. Installing a client only on the server connected to Coolify will not satisfy the check.
Configure a non-Compose application in Coolify
These steps apply to Nixpacks, Railpack, Static, Dockerfile, and Docker Image applications when the health check is managed through the Coolify interface.
- Open the application in Coolify.
- Select Healthcheck in the application settings.
- Choose HTTP for a URL probe or CMD for an arbitrary command.
- Enter the host, internal port, and path for an HTTP check, or enter the complete command for a CMD check.
- Set Interval, Timeout, Retries, and Start period.
- Select Save changes.
- Select Enable and confirm the setting.
- If the container was already running, restart or redeploy the application so Coolify creates a container with the new health-check definition.
HTTP fields and what they actually do
The form displays fields for an expected status code and expected response text. In Coolify’s current generated HTTP check, those two fields are displayed but are not compared by the generated probe. The effective test is whether the generated curl or wget command exits successfully. For a curl --fail request, a server-side error response causes failure, while a successful response allows the command to exit with code 0.
Do not use the displayed response-text field as a substitute for application-level readiness logic. Put the important readiness decision in the endpoint itself and verify the exact command from the application terminal.
CMD checks
Choose CMD when an HTTP request is not the right signal—for example, when a worker has no HTTP listener and you need to check a local process or file. The command still executes inside the container, so every executable, script, environment variable, and path it references must exist there. Design the command to return exit code 0 only when the service is ready.
Set timing values for real startup behavior
Coolify exposes four timing controls that Docker uses to decide when failures matter:
| Setting | Meaning | How to choose it |
|---|---|---|
| Interval | Time between probe attempts | Use a frequency that detects failure promptly without creating unnecessary load. |
| Timeout | Maximum time allowed for one attempt | Make it longer than a normal response, but short enough to detect a stalled process. |
| Retries | Consecutive failures required before Docker marks the container unhealthy | Allow transient startup or network delays without hiding a persistent failure. |
| Start period | Startup grace period before probe failures count | Cover migrations, cache loading, dependency initialization, and other known startup work. |
Interval, timeout, and retries must each be at least one second. The correct values depend on the application’s actual startup and response times. A slow-starting service with a short start period can be marked unhealthy while it is still doing legitimate initialization, which can cause traffic failures or an unnecessary replacement container.
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Coolify’s documentation shows interval=30s, timeout=5s, start-period=20s, and retries=3 as example Dockerfile values. Treat those as an example starting point, not universal recommendations.
Verify the probe from the application terminal
The fastest way to separate an application problem from a Coolify configuration problem is to run the same probe in the container.
- Open the application’s Terminal in Coolify.
- Run the exact HTTP request configured in the Healthcheck page, changing the example port and path to your values:
curl --fail http://localhost:3000/health - Check the command’s exit status. A successful request exits with code 0.
- If the command is missing, check for an installed client:
command -v curl || command -v wget - For a CMD check, paste the complete configured command into the terminal and inspect its output and exit status.
Testing the request from your laptop is not equivalent. Your laptop reaches the public proxy, while the health check reaches the process through the container’s own network namespace.
Add a health check to a Dockerfile
Put a Docker HEALTHCHECK instruction in the Dockerfile when the probe should be bundled with the image. The final image must contain the client used by the instruction. This example installs curl in a Node Alpine image and checks an internal readiness route:
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CMD curl --fail http://localhost:3000/health || exit 1
CMD ["npm", "start"]The backslash continues the instruction across lines. The command returns success when the request succeeds and returns failure when curl --fail reports an error.
Dockerfile precedence
For a non-Compose Dockerfile application, Coolify detects an image-provided health check and does not add the dashboard-configured check to the generated container definition. Decide which definition should be authoritative before troubleshooting apparently ignored dashboard values. If you change the Dockerfile check, rebuild and redeploy the image so the new instruction is present.
Define checks in Docker Compose
Compose applications use a different configuration path. They do not use the standard application Healthcheck page. Add a healthcheck block under each service that needs one, using the service’s internal port and local address.
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services:
api:
image: example/api:1.0
healthcheck:
test: ["CMD", "wget", "--spider", "http://127.0.0.1:3000/health"]
interval: 30s
timeout: 5s
retries: 3In this example, the image must contain wget, and the API must listen on port 3000 inside the container. A multi-service stack may need separate checks for the API, worker, database, or other services. Give each service a test that represents that service’s own readiness instead of pointing every check at the same endpoint.
If a Compose service is optional and should not determine the overall Service health, use Coolify’s documented exclude_from_hc: true option for that service. Keep the setting with the Compose service definition so the behavior is reproducible when the stack is redeployed.
How health checks affect routing and updates
Traefik routing
When Coolify Proxy uses Traefik, unhealthy application containers are removed from routing. If every container fails its check, Traefik may return 404 Not Found or No available server rather than forwarding a request to an unhealthy process. Those messages usually indicate that no container currently qualifies for traffic; they do not identify the original application error by themselves.
Application-level rolling updates
During an application-level rolling update, Coolify can wait for a new container to pass its health check before removing the old container. If the replacement never becomes healthy, Coolify can remove that failed replacement while the healthy version remains available. This behavior depends on a meaningful readiness endpoint: a check that passes before migrations or dependencies are ready can send traffic to a broken replacement.
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Compose reconciliation
Docker Compose uses its own service reconciliation process rather than Coolify’s application-level rolling-update sequence. Treat Compose health checks as service-level definitions and do not assume the same replacement ordering as a single Coolify-managed application.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshoot an unhealthy app or “No available server”
Work through these checks in order. Each step removes a common source of ambiguity before you change timing values.
1. Run the exact probe inside the container
Open the application terminal and execute the configured URL or command. If it fails there, inspect the endpoint, process, port, and image. If it succeeds manually but Coolify still reports failure, continue with the binary and container-recreation checks below.
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2. Confirm the probe binary exists
Run command -v curl || command -v wget. A missing client means the generated HTTP check cannot run, even if the endpoint is healthy from another machine. Add the client to the final image and redeploy.
3. Check the internal port
Use the port on which the process listens inside the container. Do not copy the public URL’s port or a host-to-container mapping into the internal request. Confirm the application’s bind address and listen port from its runtime configuration.
4. Read runtime logs
Inspect Runtime Logs for crashes, failed migrations, dependency connection errors, binding failures, and initialization that takes longer than the configured start period. A health check reports the symptom; runtime logs usually show the cause.
5. Recreate the container after configuration changes
Saving a check changes Coolify’s configuration, but an already-running container does not automatically gain a new definition. Restart or redeploy the application. For Dockerfile changes, rebuild the image as part of that deployment; for Compose changes, redeploy the stack so the service definition is applied.
6. Reconsider readiness semantics
If the endpoint responds successfully while the application still cannot serve real requests, move the readiness decision later in startup. If it performs expensive work, split a lightweight liveness endpoint from a readiness endpoint and use the readiness endpoint for routing decisions.
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- Using a public hostname: the check is local to the container and should normally call
localhoston the internal port. - Installing
curlon the server only: the executable must be in the application image. - Expecting the response-text field to validate content: the current generated HTTP check relies on the
curlorwgetexit status rather than comparing the displayed expected text. - Forgetting to redeploy: a saved setting does not alter an existing container until it is recreated.
- Using the application Healthcheck page for Compose: define
healthcheckunder each Compose service instead. - Setting a short start period: migrations, cache loading, or dependency initialization may legitimately outlast it.
- Checking an endpoint with side effects: repeated probes can alter data or trigger work unexpectedly.
- Adding a client in an intermediate build stage: multi-stage builds must copy or install the executable in the final runtime stage.
A practical setup checklist
- Identify whether the application is managed through Coolify, a Dockerfile, or Docker Compose.
- Choose a lightweight readiness endpoint or a deterministic CMD.
- Use
localhostor127.0.0.1and the container’s listening port. - Ensure
curlorwgetexists in the final image for HTTP checks. - Set interval, timeout, retries, and start period to match observed startup and response behavior.
- Save and enable the check.
- Restart or redeploy to recreate an existing container.
- Run the exact probe from the application terminal.
- Review runtime logs if the probe fails or every container is removed from routing.
Bottom line
A dependable Coolify health check is a local, repeatable readiness test: it runs inside the container, uses the internal port, has its client binary available in the image, and waits long enough for genuine startup work. Use the Coolify Healthcheck page for supported non-Compose applications, a Dockerfile HEALTHCHECK when the image should own the rule, and a per-service Compose healthcheck for stacks. Always verify the exact command in the application terminal and recreate the container after changing the configuration.
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