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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteIf docker compose down appears to pause for about ten seconds, Docker is usually waiting for a container to shut down gracefully. Compose asks the container’s main process to exit with SIGTERM, waits through the configured grace period, and then uses SIGKILL if the process is still running. The reliable fix is to make the application receive and handle the signal correctly; increasing the timeout is appropriate only when legitimate cleanup needs more time.
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What docker compose down actually does
docker compose down tears down the active Compose project. It stops the project’s containers, removes those containers, and removes the project networks. Additional options can request removal of associated volumes or images, so read the command you are about to run carefully if persistent data matters.
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The --timeout (or -t) option changes how long Compose waits during shutdown. It applies to that command invocation; it is not a repair for an application that ignores termination signals. A command such as docker compose down --timeout 30 gives the containers 30 seconds to finish their normal stop path before Docker forcefully ends any process that remains.
The normal shutdown timeline
Compose delegates container stopping to Docker. The sequence is deterministic:
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- Compose identifies the containers belonging to the project and requests a stop.
- Docker sends
SIGTERMto the container’s main process (PID 1), unless the service defines anotherstop_signal. - Docker waits for the container’s stop grace period. The documented default is 10 seconds.
- If the process has not exited when that period expires, Docker sends
SIGKILL. The process cannot catch or defer this signal. - After the containers stop, Compose removes the project containers and networks, plus any other resources requested by the command’s flags.
“The docker compose stop command attempts to stop a container by sending a SIGTERM. It then waits for a default timeout of 10 seconds. After the timeout, a SIGKILL is sent to the container to forcefully kill it.”
That ten-second wait is therefore not an arbitrary Compose pause. It is the opportunity for the application to close connections, flush data, finish in-flight work, and exit on its own. A teardown that consistently reaches the timeout boundary indicates either a slow but intentional cleanup path or a signal-delivery problem.
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A shell is PID 1 instead of the application
The most common documented cause is a shell-form command in the image. When an image starts through a shell, the shell can become PID 1 while the real application runs as its child. Docker sends SIGTERM to PID 1. If that shell does not forward the signal, the application never sees the request to shut down and remains alive until Docker sends SIGKILL.
Prefer the exec form in the Dockerfile so the application is the container’s main process. For a Node application, the pattern is:
CMD ["node", "server.js"]This arrangement makes the application process PID 1 and gives it a direct opportunity to handle SIGTERM. Replacing a shell wrapper with exec form does not by itself guarantee clean shutdown if the application has no handler, but it removes the signal-forwarding failure at the container boundary.
The application does not handle SIGTERM
Receiving a signal and knowing what to do with it are separate concerns. An application can be PID 1 and still continue running because it has no termination handler, waits indefinitely for a worker, or treats SIGTERM as an ordinary ignored signal. In that case, Compose waits through the grace period and Docker eventually uses SIGKILL.
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A graceful handler should stop accepting new work, let safe in-flight work finish, close network and database connections, flush pending writes, stop child workers, and then exit. The handler must also have a bounded path: a cleanup routine that can wait forever is functionally the same as no handler when the timeout expires.
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The image expects a different signal
Compose uses SIGTERM unless the service’s stop_signal is configured. Some software documents another signal for an orderly shutdown. If the image expects that signal, set stop_signal to the documented value rather than assuming the default is correct. Do not change the signal speculatively: use the application’s own shutdown documentation or observed behavior to choose it.
Cleanup legitimately takes longer than ten seconds
Not every timeout means the container is broken. Databases may finish transactions, queues may drain work, and web servers may complete requests and close connections. A service can be functioning correctly while its normal shutdown exceeds the default grace period.
Compose lets you express that policy per service with stop_grace_period. It accepts a duration such as 30s or 1m30s. This setting documents the expected cleanup window and applies whenever that service is stopped, rather than only during one manual teardown.
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Measure before changing timeouts. A project with several services can appear to hang because one container is still running while the others have already stopped.
1. List the project containers
docker compose psUse the output to identify services that remain running or show an unhealthy state while teardown is in progress. Record the service name and the container name shown by Compose; you will need them for logs and inspection.
2. Read the service logs
docker compose logs SERVICEReplace SERVICE with the Compose service name. Look for a shutdown message, a message that never appears, or a final operation that repeats. A log line announcing that the process received a termination request is evidence that the signal reached the application; silence can indicate a shell wrapper, a different process owning PID 1, or an application that does not log signal handling.
3. Inspect the container configuration
docker inspect CONTAINERReplace CONTAINER with the container name or ID. Check the configured entrypoint and command, the image used by the service, and any stop-signal or timeout settings. Compare the actual command with the Dockerfile: a Compose override can reintroduce a shell even when the image itself uses exec form.
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4. Separate a slow stop from a removal problem
Observe when the delay occurs. If the pause happens before the container reports stopped, it is the signal and grace-period phase. If containers stop promptly but network or resource removal takes time, investigate the resource being removed instead of increasing the shutdown timeout. The --timeout option controls the container stop wait, not every operation performed after stopping.
Fix the signal path first
Use exec-form entrypoints
Change shell-form startup in the Dockerfile to an exec-form instruction, rebuild the image, and ensure Compose uses the rebuilt image. The important property is that the long-running application becomes PID 1. If a wrapper script is required for environment preparation, it should eventually replace itself with the application process rather than leaving the application as an uncooperative child.
After changing the image, recreate the service. A running container keeps its old process tree; editing a Dockerfile does not alter that container in place. Bring the project up with the rebuilt image, then repeat the teardown test.
Add bounded graceful-shutdown handling
Implement an explicit SIGTERM path in the application. The handler should coordinate workers and external connections, reject new requests, complete only work that can finish within the service’s grace period, and exit with a clear status. Ensure errors during cleanup do not leave the process waiting indefinitely.
Test the handler independently of Compose when possible. A process that exits cleanly after receiving SIGTERM will also give Compose a clean stop path, while a process that only stops after SIGKILL will continue to hit the timeout regardless of the Compose command used.
Set stop_signal only when the application requires it
If the application’s documentation specifies a signal other than SIGTERM, configure that signal on the service. The setting belongs with the service definition because it describes how that particular image shuts down. Keep the default when the application already handles SIGTERM; changing signals without a documented reason can make shutdown less predictable.
Configure a service-specific grace period
Use stop_grace_period when you have confirmed that the process is receiving the intended signal and is performing valid cleanup that takes longer than ten seconds. A Compose service can declare, for example:
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services:
app:
stop_grace_period: 30sFor a longer, measured operation, a value such as 1m30s is also valid. Choose the shortest period that covers the observed cleanup rather than adding a large cushion. A long grace period slows every teardown of that service, including emergency maintenance, and can conceal a regression if no one watches the logs.
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Keep the policy close to the service that needs it. A database may need more time to flush state while a stateless front end may stop in well under a second. Giving the entire project a uniformly large timeout makes it harder to see which service actually needs special treatment.
Use a one-off timeout when the policy should not persist
For a single maintenance operation, increase the command timeout:
docker compose down --timeout 30This gives the project’s containers 30 seconds for the stop phase during that invocation. It does not add signal handling, change PID 1, or repair an image whose process ignores SIGTERM. If the process is stuck, the longer wait merely postpones the eventual SIGKILL.
A command-level timeout is useful when cleanup is temporarily heavier than usual or when you are validating a service before committing a persistent Compose policy. Once the same duration is required on every stop, move the setting to the affected service’s stop_grace_period and keep the command timeout at its normal value.
Remedy comparison
| Remedy | Scope | Signal correctness | Cleanup duration | Data-safety risk |
|---|---|---|---|---|
| Exec-form entrypoint | Image and every container created from it | Delivers SIGTERM directly to the application as PID 1 |
Does not add time; enables the application’s existing handler | Reduces forced termination when the shell was blocking the signal |
| Application shutdown handler | Application code | Defines how the process responds to the received signal | Allows bounded draining, flushing, and connection closure | Can protect in-flight writes when implemented and tested correctly |
stop_signal |
One Compose service | Uses the signal documented by that application | Leaves the grace-period length unchanged | Safer than a mismatched default when the image requires another signal |
stop_grace_period |
One Compose service, persistently | Does not change which signal is sent | Extends the service’s normal wait, such as 30s or 1m30s |
Reduces premature killing only when cleanup is known to be progressing |
docker compose down --timeout 30 |
One teardown command | Does not repair signal delivery | Extends the current command’s wait to 30 seconds | Can delay force-killing but still ends with SIGKILL if the process never exits |
How to choose a safe timeout
Start with evidence from logs and inspection. If the application receives SIGTERM and logs a sequence of cleanup actions, measure the longest normal run of that sequence and add only a modest operational margin. If there is no progress, increasing the number is the wrong fix: correct the entrypoint, signal, or handler first.
- Use the default when the service exits promptly and no data is at risk.
- Use a longer service policy when the same, observable cleanup regularly exceeds ten seconds.
- Use a one-off command timeout for an exceptional teardown while you investigate whether the behavior should become permanent.
- Avoid indefinite waits. Every grace period should have a reason and a bounded cleanup path.
The key safety distinction is whether the process is making progress. A longer timeout protects a process that is flushing data or finishing requests. It does not protect a process that never received the signal, has deadlocked, or is waiting on a child that cannot exit.
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Recreate and verify the change
- Update the Dockerfile, application shutdown code, or Compose service definition.
- Rebuild the image if the entrypoint or application code changed.
- Recreate the affected service so the new process tree and settings are actually applied.
- Run
docker compose psand confirm the expected service is present. - Run
docker compose logs SERVICEwhile stopping the project and watch for the termination and cleanup messages. - Run
docker compose downwith the normal timeout, then check that the containers and project networks are removed as intended.
If the service still consumes exactly the grace-period boundary after the change, inspect the newly created container rather than the old one. Persistent timing at the boundary usually means the process is still not exiting, the wrong command is being launched, or the configured signal does not match the application.
Troubleshooting branches
The delay is always exactly ten seconds
An exact ten-second pattern strongly points to the default grace period expiring. Check whether PID 1 is a shell, whether the application logs a termination event, and whether the service overrides the stop signal. Fix those conditions before setting a larger number.
The delay varies and logs show cleanup work
Variable duration with visible progress is consistent with legitimate draining or flushing. Measure the slow cases, set a service-specific stop_grace_period that covers them, and keep monitoring so a new hang is not mistaken for normal cleanup.
The application exits, but down still appears stuck
Use docker compose ps to see whether another service is still running. Compose stops project containers individually; one slow dependency can hold up the overall command even when the application you were watching has already exited. Inspect logs and configuration for each remaining service.
Force-killing loses recent data
SIGKILL cannot be handled, so any writes or transactions still in progress can be interrupted. Treat repeated forced kills as an operational defect for stateful services. Implement bounded shutdown, make sure the signal reaches the real process, and set a grace period long enough for the verified cleanup sequence.
A timeout change had no effect
Confirm which mechanism you changed. docker compose down --timeout 30 affects one command. stop_grace_period affects the service definition used when containers are created. If the image or Compose command changed, recreate the service; existing containers retain their original process and configuration.
Bottom line
A slow Compose teardown is a symptom, not a single failure mode. Docker’s normal contract is to send SIGTERM, wait 10 seconds by default, and then send SIGKILL. First make the application PID 1 and give it a bounded graceful-shutdown handler. Then select the correct stop_signal if the image requires one, and declare a measured stop_grace_period for services whose valid cleanup exceeds the default. Reserve docker compose down --timeout for one-off timing changes, because a larger number cannot fix a process that never receives or acts on the shutdown signal.
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