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Add docs for label/env log-opts

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Signed-off-by: Vincent Demeester <vincent@sbr.pm>
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Vincent Demeester
2015-10-13 08:39:47 +02:00
parent 0083f6e984
commit cd426ebed7
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docs/reference/logging/fluentd.md
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@@ -73,6 +73,24 @@ Refer to the [log tag option documentation](log_tags.md) for customizing
the log tag format.
### labels and env
The `labels` and `env` options takes a comma-separated list of keys. If there is collision between `label` and `env` keys, the value of the `env` takes precedence.
To use attributes, specify them when you start the Docker daemon.
```
docker daemon --log-driver=fluentd --log-opt labels=foo --log-opt env=foo,fizz
```
Then, run a container and specify values for the `labels` or `env`. For example, you might use this:
```
docker run --label foo=bar -e fizz=buzz -d -P training/webapp python app.py
````
This adds additional fields to the extra attributes of a logging message.
## Fluentd daemon management with Docker
About `Fluentd` itself, see [the project webpage](http://www.fluentd.org)