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Update Zookeeper logging docs

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Elisey Zanko 2021-08-01 14:19:10 +05:00
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@ -152,12 +152,20 @@ This image is configured with volumes at `/data` and `/datalog` to hold the Zook
## How to configure logging
By default, ZooKeeper redirects stdout/stderr outputs to the console. You can redirect to a file located in `/logs` by passing environment variable `ZOO_LOG4J_PROP` as follows:
By default, ZooKeeper redirects stdout/stderr outputs to the console. Since 3.8 ZooKeeper is shipped with [LOGBack](https://logback.qos.ch/) as the logging backend. The ZooKeeper default `logback.xml` file resides in the `/conf` directory. To override default logging configuration mount your custom config as a volume:
```console
$ docker run --name some-zookeeper --restart always -d -v $(pwd)/logback.xml:/conf/logback.xml %%IMAGE%%
```
Check [ZooKeeper Logging](https://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_logging) for more details.
### Logging in 3.7
You can redirect to a file located in `/logs` by passing environment variable `ZOO_LOG4J_PROP` as follows:
```console
$ docker run --name some-zookeeper --restart always -e ZOO_LOG4J_PROP="INFO,ROLLINGFILE" %%IMAGE%%
```
This will write logs to `/logs/zookeeper.log`. Check [ZooKeeper Logging](https://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_logging) for more details.
This image is configured with a volume at `/logs` for your convenience.
This will write logs to `/logs/zookeeper.log`. This image is configured with a volume at `/logs` for your convenience.