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Updating env var documentation 

The position was a bit too early. Fleshed out the example.
Also, using the _ underscore for emphasis was confusing because it is also used to indicate
a level change.

Signed-off-by: Mary Anthony <mary@docker.com>
This commit is contained in:
Mary Anthony 2015-04-27 15:49:19 -07:00 committed by Richard
parent fb499fd607
commit 1a181e8887
1 changed files with 28 additions and 12 deletions
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40
docs/configuration.md
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@ -9,18 +9,6 @@ You configure a registry server using a YAML file. This page explains the
configuration options and the values they can take. You'll also find examples of
middleware and development environment configurations.
## Overriding configuration options
Environment variables may be used to override configuration parameters other than
version. To override a configuration option, create an environment variable named
REGISTRY\_variable_ where *variable* is the name of the configuration option.
e.g
```
REGISTRY_STORAGE_FILESYSTEM_ROOTDIRECTORY=/tmp/registry/test
```
will set the storage root directory to `/tmp/registry/test`
## List of configuration options
This section lists all the registry configuration options. Some options in
@ -134,6 +122,34 @@ options marked as **required**. This indicates that you can omit the parent with
all its children. However, if the parent is included, you must also include all
the children marked **required**.
## Override configuration options
You can use environment variables to override most configuration parameters. The
exception is the `version` variable which cannot be overridden. You can set
environment variables on the command line using the `-e` flag on `docker run` or
from within a Dockerfile using the `ENV` instruction.
To override a configuration option, create an environment variable named
`REGISTRY\variable_` where *`variable`* is the name of the configuration option
and the `_` (underscore) represents indention levels. For example, you can
configure the `rootdirectory` of the `filesystem` storage backend:
```
storage:
filesystem:
rootdirectory: /tmp/registry
```
To override this value, set an environment variable like this:
```
REGISTRY_STORAGE_FILESYSTEM_ROOTDIRECTORY=/tmp/registry/test
```
This variable overrides the `/tmp/registry` value to the `/tmp/registry/test`
directory.
## version
```yaml