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53 lines
2.0 KiB
Markdown
53 lines
2.0 KiB
Markdown
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Runs a one-time command against a service.
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the following command starts the `web` service and runs `bash` as its command.
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`docker compose run web bash`
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Commands you use with run start in new containers with configuration defined by that of the service,
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including volumes, links, and other details. However, there are two important differences:
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First, the command passed by `run` overrides the command defined in the service configuration. For example, if the
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`web` service configuration is started with `bash`, then `docker compose run web python app.py` overrides it with
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`python app.py`.
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The second difference is that the `docker compose run` command does not create any of the ports specified in the
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service configuration. This prevents port collisions with already-open ports. If you do want the service’s ports
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to be created and mapped to the host, specify the `--service-ports`
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```
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docker compose run --service-ports web python manage.py shell
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```
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Alternatively, manual port mapping can be specified with the `--publish` or `-p` options, just as when using docker run:
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```
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docker compose run --publish 8080:80 -p 2022:22 -p 127.0.0.1:2021:21 web python manage.py shell
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```
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If you start a service configured with links, the run command first checks to see if the linked service is running
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and starts the service if it is stopped. Once all the linked services are running, the run executes the command you
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passed it. For example, you could run:
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```
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docker compose run db psql -h db -U docker
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```
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This opens an interactive PostgreSQL shell for the linked `db` container.
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If you do not want the run command to start linked containers, use the `--no-deps` flag:
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```
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docker compose run --no-deps web python manage.py shell
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```
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If you want to remove the container after running while overriding the container’s restart policy, use the `--rm` flag:
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```
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docker compose run --rm web python manage.py db upgrade
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```
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This runs a database upgrade script, and removes the container when finished running, even if a restart policy is
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specified in the service configuration. |