So far, we have covered all that is required to set up an Apache Hadoop cluster running CDH5 and managed by Cloudera Manager. With the cluster now ready to serve large volumes of data to users, the administrator needs to take into account the different users who will be accessing the system. In a production environment, organizations are very stringent in terms of security and expect their data and services to be secure. The administrator needs to have the tools to secure the Apache Hadoop cluster in their armor, and allow only authenticated users to access the cluster. Apart from authorization, the administrator has to be careful about what services in the cluster a user can access. Using Kerberos, the administrator can set up a highly secure cluster with robust authentication for users and services.

In this chapter, we will cover the following topics: