![](/2020/06/01/Kerberos-on-Hadoop/kerberos-on-hadoop.png)
The Kerberos is an authentication protocol which creates tickets to allow communication between nodes on non-secured network. Ticket must be periodically triggered by kinit command by each user. In Kerberos we call users as principals. We can divided principals basically into several groups:
- System users – principals for communication between services in Hadoop cluster
- Common users