View logs for a specific Docker Compose service
When using docker-compose up, we can see the logs of all containers in the YAML file; however, if we specify a specific container service, the output will not show any service dependencies in the log. Therefore, this article will explore how to correctly export the output Docker Compose service logs.
View logs for a specific Docker Compose service
You can start Docker Compose in detached mode and later attach yourself to the logs of all containers. Then, if you are done watching the log traces, you can detach from the log output without shutting down the service.
Follow these steps to accomplish this:
-
Use
docker-compose up -d-d option to start all services in detached mode. -
Use
docker-compose logs -t -fto attach ourselves to the logs of all running services. The -t option gives us a timestamp, and the -f parameter means we follow the log output while the service is running. - Use Ctrl+Z or Ctrl+C to detach yourself from the log output without shutting down the running container.
-
If we need to specify the logs of a single container, we can use the following command:
$ docker-compose logs -t -f <service name> -
To save the output to a file, we can
>>add it to the end of the command using the - operator.$ docker-compose logs -t -f >> sample.log
Using Docker Compose V2
Starting with Docker Compose version 2, we can now use docker-compose without the dash (-). We can also use most of the docker-compose commands and call them similarly without the dash:
$ docker compose logs -t -f --tail 3 sample-service test-service >> sample.log
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