3. Configure Flume

You configure Flume by using a properties file, which is specified on Flume start-up. The init scripts installed by flume-node bring up a single Flume agent on any host, using the contents of /etc/flume/conf/flume-conf.

To see what configuration properties you can adjust, a template for this file is installed in the configuration directory at: /etc/flume/conf/flume-conf.properties.template. A second template file exists for setting environment variables automatically at start-up: /etc/flume/conf/flume-env.sh.template.

Common configuration option choices include the following:

Set primary configuration options in /etc/flume/conf/flume-conf:
- If you are using the HDFS sink make sure the target folder is in HDFS
Set environment options in /etc/flume/conf/flume-env.sh:
- To enable JMX monitoring, add the following properties to JAVA_OPTS
```
JAVA_OPTS="-Dcom.sun.management.jmxremote 
-Dcom.sun.management.jmxremote.port=4159 
-Dcom.sun.management.jmxremote.authenticate=false 
-Dcom.sun.management.jmxremote.ssl=false"
```
- To enable Ganglia monitoring, add the following properties to JAVA_OPTS
```
JAVA_OPTS="-Dflume.monitoring.type=ganglia 
-Dflume.monitoring.hosts=<ganglia-server>:8660" 
```
  Where <ganglia-server> is the name of the Ganglia server host.
- To optimize the heap size, add the following properties to JAVA_OPTS
```
JAVA_OPTS= "-Xms100m -Xmx200m"
```
Set the log directory for log4j in /etc/flume/conf/log4j.properties
```
flume.log.dir=/var/log/flume
```

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