Question-31: What is the cluster name limitations if we kerberize the Cluster?

Answer: If we kerberize the cluster, then we should have cluster name at the max with 12 character. Reason being Kerberos principals will be appended to the cluster name string and cause an issue with the various identity solutions providers.

Question-32: Why Ambari needs the Internet Proxy Server?

Answer: To install the software from public repository like getting Hadoop components. Then we need to provide Ambari and the hosts in the cluster with the internet access. There are basically two things involved

• Ambari server would provide the internet access and validate the repository.
• Software would be installed using the yum package manager.

So if no access to internet provided then we have to create local repository or access the repository from the local network.

Question-33: What are the advantages of setting up the proxy server, username, and password in /etc/yum.conf file?

Answer: If we configure the proxy server, username and password in the /etc/yum.conf file then all the users of yum can connect to the proxy server.

Question-34: What all are possible permissions in Ambari which can be assigned to user or groups?

Answer: If you are an Ambari administrator then you can assign the Clutser, Host, Service and Users level permissions.

Question-35: What all are the roles available in Ambari cluster?

Answer: There are following roles are currently available

• Cluster user: If any user want to see the information about the cluster and its services, including configurations, service status and any health alerts. This is read-only permissions or you can say view-only users.
• Service Operators: With this permission you can have control over service life cycle management like starting and stopping services, performing service checks and rebalancing HDFS as well refreshing the YARN Capacity cluster.

We are planning to have On-demand HDP administrator training as well, please check the link here.

• Service Administrator: If you are service administrator role then you would have Service Operator level permissions as well as configure the service as well. For example, enabling High Availability.
• Cluster Operator: If you want to add and remove the host to cluster then you need this permission. Hence, cluster operator would have permissions as the Service Administrator as well as ability to perform host level operations.
• Ambari Administrator: This is a full control and can do all the possible operations on Ambari. For example creating cluster, changing cluster name, register new cluster etc.