Question-51: What are the differences between the logs collected by Cloudera Manager and Cloudera Navigator?

Answer: 

• Cloudera Navigator: Tracks and aggregates accesses to the data stored in CDH services and is used for audit report analysis. 
• Cloudera Manager: It monitors and logs all activities performed by CDH services that helps administrators maintain the health of the cluster. 

Question-52: Before installing Cloudera Manager, SELinux should be in which mode?

Answer: Cloudera supports the running of the Cloudera Software with SELinux enabled, However, Cloudera Manager installer would not proceed if SELinux is enabled. Hence, we need to disable SELinux or set it to permissive mode before running the installer. Once Cloudera Manager and CDH deployment is done, you can re-enable SELinux by changing SELinux=permissive back to SELINUX=enforcing 

Question-53: Can you please tell me something about Upgrading CDH using Cloudera Manager?

Answer: We can upgrade the CDH within the Cloudera Manager Admin Console using parcels. Once CDH is upgraded using parcels, you can perform rolling upgrades on your CDH services. If HDFS high availability configured and enabled the we can do the rolling upgrades on the cluster without bringing down the entire cluster. 

Question-54: Why i am not able to find the CDH libraries when CDH is distributed using parcels?

Answer: Because in case of parcels all the libraries are installed on different path at /opt/Cloudera /parcels/CDH/lib and not at under /usr/lib

Question-55: I don’t have access to public internet, can I use the local repository to install software?

Answer: In both the cases whether you use parcels or packages it is possible to create local repositories that serves these files to hosts that are being upgraded. And no need to access Cloudera public repositories.