Adding a new node in an existing HDI cluster monitored by Unravel

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Make sure that you have successfully connected to your existing Hadoop, HBase, or Spark cluster to ensure your jobs status won't be displayed as failures.

If you have changed your Kerberos tokens or principal you must perform the following steps:

Update the following properties to ensure the latest Kerberos keytab file for Unravel is available on Unravel servers.
```
com.unraveldata.kerberos.principal=new principal
com.unraveldata.kerberos.keytab.path=new path
```
Make sure the new file's ownership/permission is restored to the original setup.
Restart all services.
```
sudo /etc/init.d/unravel_all.sh start
```

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