# 1.FAQ

## 6.1.1 Enable Zookeeper

When your zookeeper version is after 3.5, you need to open zkcli permission to repair the script content. The modification code is as follows:

```bash
vi zkServer.sh
...
// zookeeper enable client commands
ZOOMAIN="-Dzookeeper.4lw.commands.whitelist=* ${ZOOMAIN}"
```

## 6.1.2 Kafka Enable JMX PORT

If your data is empty, check that the port of JMX is started . If you do not start, you can edit the script before you start.

```bash
vi kafka-server-start.sh
...
if [ "x$KAFKA_HEAP_OPTS" = "x" ]; then
    export KAFKA_HEAP_OPTS="-server -Xms2G -Xmx2G -XX:PermSize=128m -XX:+UseG1GC -XX:MaxGCPauseMillis=200 -XX:ParallelGCThreads=8 -XX:ConcGCThreads=5 -XX:InitiatingHeapOccupancyPercent=70"
    export JMX_PORT="9999"
fi
```


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