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docker: update documentation for container options (#2965)

- Created a Container options section in `docker/README.md`
- Add documentation for SOCAT_LINK
- Move CROND documentation to the new section
pull/2979/head
Jean-Philippe Roemer 9 years ago committed by Unknwon
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69e00f9948
  1. 24
      docker/README.md

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docker/README.md

@ -73,9 +73,27 @@ Most of settings are obvious and easy to understand, but there are some settings
Full documentation of application settings can be found [here](http://gogs.io/docs/advanced/configuration_cheat_sheet.html).
### Crond
Please set environment variable `RUN_CROND` to be `true` or `1` in order to start `crond` inside the container.
### Container options
This container have some options available via environment variables, these options are opt-in features that can help the administration of this container:
- **SOCAT_LINK**:
- <u>Possible value:</u>
`true`, `false`, `1`, `0`
- <u>Default:</u>
`true`
- <u>Action:</u>
Bind linked docker container to localhost socket using socat.
Any exported port from a linked container will be binded to the matching port on localhost.
- <u>Disclaimer:</u>
As this option rely on the environment variable created by docker when a container is linked, this option should be deactivated in managed environment such as Rancher or Kubernetes (set to `0` or `false`)
- **RUN_CROND**:
- <u>Possible value:</u>
`true`, `false`, `1`, `0`
- <u>Default:</u>
`false`
- <u>Action:</u>
Request crond to be run inside the container. Its default configuration will periodically run all scripts from `/etc/periodic/${period}` but custom crontabs can be added to `/var/spool/cron/crontabs/`.
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