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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
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@ -73,9 +73,27 @@ Most of settings are obvious and easy to understand, but there are some settings
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Full documentation of application settings can be found [here](http://gogs.io/docs/advanced/configuration_cheat_sheet.html).
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### Crond
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### Container options
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Please set environment variable `RUN_CROND` to be `true` or `1` in order to start `crond` inside the container.
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This container have some options available via environment variables, these options are opt-in features that can help the administration of this container:
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- **SOCAT_LINK**:
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- <u>Possible value:</u>
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`true`, `false`, `1`, `0`
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- <u>Default:</u>
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`true`
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- <u>Action:</u>
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Bind linked docker container to localhost socket using socat.
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Any exported port from a linked container will be binded to the matching port on localhost.
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- <u>Disclaimer:</u>
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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`)
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- **RUN_CROND**:
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- <u>Possible value:</u>
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`true`, `false`, `1`, `0`
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- <u>Default:</u>
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`false`
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- <u>Action:</u>
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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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## Upgrade
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