The Tool Desk
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What Docker Compose can—and cannot—keep running
A 24/7 stream depends on several layers. docker compose up -d starts services in detached mode; Docker’s restart policy can restart a container after it exits; and a working broadcast still depends on the host, network, encoder, YouTube ingest, and valid stream credentials. A restart policy is not a promise that the video feed is healthy or continuously available.
- Detached operation: Compose returns control of the terminal while the containers continue in the background.
- Container recovery: Docker applies the service’s restart policy when its conditions are met.
- Broadcast availability: YouTube must receive an accepted feed from a functioning encoder over a working connection.
Define the encoder as a Compose service
Use this minimal structure as a starting point:
services:
stream:
image: your-encoder-image
restart: unless-stopped
# Configure the encoder's input, output URL, and stream key
# using the image's documented interface.This is a structural example, not a ready-to-run encoder configuration. It does not specify an image, command, media input, output syntax, encoding settings, or secret-management method. Check the documentation for the encoder image you choose before adding those details.
Start the service and inspect its state and output:
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docker compose up -d
docker compose ps
docker compose logs -f streamdocker compose ps shows the service’s container state. docker compose logs -f stream follows the encoder service’s logs; stop following them with Ctrl+C without treating that as a command to stop the container.
Choose the restart policy that matches how you operate
| Policy | Documented behavior | When it may fit |
|---|---|---|
unless-stopped |
Restarts regardless of exit code, except when the container has been deliberately stopped or removed. An intentional stop remains stopped through a Docker daemon restart. | A common choice for a long-running stream that should recover from exits but stay stopped when you deliberately stop it. |
always |
Restarts until the container is removed. Its behavior after a manual stop and a daemon restart differs from unless-stopped; check Docker’s current documentation against your operating expectations. |
Consider it when the service should return after daemon restarts even if it had been manually stopped. |
on-failure or on-failure:max-retries |
Restarts when the container exits with an error. A retry limit can be specified. | Use it when only error exits should trigger recovery or you want to cap retries. A clean exit does not meet the failure condition. |
no |
The default; Docker does not automatically restart the container. | Not suitable when you want Docker to recover an unattended encoder after an exit. |
For an unattended, long-running encoder, unless-stopped is often the clearest default. Apply a restart policy to the encoder service rather than automatically adding one to every service in a Compose project: a one-shot or maintenance container may need different behavior. Dependencies and process health also need their own design.
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Know the limits and operational details
The policy takes effect only after a successful start
Docker documents that a restart policy becomes active after the container has started successfully. Docker defines this as the container running for at least 10 seconds while the daemon monitors it. A container that fails during initial startup may therefore not be handled as an established service by the policy.
A deliberate stop is different from a crash
Docker suppresses restarts after a manual stop until the daemon restarts or the container is manually started again. With unless-stopped, the deliberate stop remains in effect through a daemon restart. This distinction matters when planning maintenance and host reboots.
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Restarting is not health monitoring
The policy reacts to container termination; it does not by itself detect a hung encoder, a disconnected feed, or a stream that is no longer reaching YouTube. Monitoring and reconnect behavior are separate concerns. Check the documentation for your encoder and use an appropriate health-check or monitoring design if you need to detect failures that do not terminate the process.
Apply configuration changes the right way
docker compose restart restarts existing containers but does not apply changed Compose configuration, such as updated environment values. Use the appropriate Compose reconciliation workflow when you change the service definition; do not assume that restart reloads the file.
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Allow the encoder to shut down cleanly
Compose’s FAQ says docker compose stop sends SIGTERM and waits for a default 10-second timeout before sending SIGKILL. Use an encoder command and process setup that handle termination signals appropriately so a stop can be graceful.
Avoid competing container supervisors
Do not use a separate host-level process manager to control the same containers alongside Docker restart policies. Docker warns that these approaches can conflict.
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Set up YouTube ingest separately
Docker can start and restart the encoder, but it cannot enable live streaming for your YouTube account or supply the correct ingest credentials. YouTube supports encoder workflows, including software running on a computer. If you are enabling live streaming for the first time, YouTube says activation may take up to 24 hours, so do it in advance.
- Enable live streaming on the YouTube account. Complete any account-side setup and allow for the possible first-time activation delay.
- Get the stream URL and stream key from YouTube’s live-stream settings. The stream URL and key are entered into the encoder; Docker’s restart policy does not configure either one.
- Configure the encoder using its documented interface. Supply the media input and YouTube output details in the format that the chosen image supports.
- Keep the key private. YouTube describes the stream key as functioning like the stream’s password and address. Do not publish it in a public Compose file or expose it in logs. Use an appropriate secret or environment-injection method for your deployment.
- Review YouTube’s broadcast settings for the stream. YouTube offers options such as auto-start, auto-stop, and latency. Lower latency may increase playback buffering; the lowest latency may not matter for a stream that is not interactive.
Troubleshoot common failures
| Symptom | What to check | Next step |
|---|---|---|
| The service exits and stays down. | Check docker compose ps and docker compose logs -f stream for startup errors, then confirm the image, command, input, and output configuration against the image’s documentation. |
Correct the configuration and use Compose’s reconciliation workflow to apply it. A restart policy cannot fix an invalid command or missing configuration. |
Changing an environment value has no effect after docker compose restart. |
The restart command restarts existing containers but does not apply changed Compose configuration. | Reconcile the service with the updated Compose definition instead of relying on restart to reload it. |
| The container is running, but YouTube does not show a healthy feed. | Confirm the account can stream, the encoder has the correct stream URL and key, and the host can reach YouTube’s ingest service. Look at encoder logs for its own connection status. | Resolve the ingest, credential, network, or encoder issue. A running container alone does not prove YouTube is receiving a usable feed. |
| The stream stops after an intentional maintenance stop. | Check whether the service was manually stopped and which restart policy is configured. | With unless-stopped, a deliberate stop persists across daemon restarts. Start the service again when you are ready. |
| The encoder is silent or stuck but the container remains running. | A restart policy reacts to container exits, not every unhealthy broadcast condition. | Use encoder-specific reconnect behavior and a separate monitoring or health-check design if required. |
Plan for the host and ongoing costs
Docker Compose does not remove the need for a computer or server to run the container, nor for power and an internet connection at that host. A dedicated computer such as a mini PC may be an option, but there is no universal hardware requirement established here: suitability depends on the resolution, codec, encoding mode, and workload. A UPS may help with short power interruptions, but it does not guarantee that a stream will continue through an outage.
Budget for the host, power, network access, and any other services you choose to use. No specific encoder image, hardware configuration, bitrate, or end-to-end uptime level is established here, so validate those needs against your chosen encoder and workload rather than assuming a fixed specification.
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