Failed to start Cloudera Manager Agent

Some errors when you click on Details:

MainThread agent ERROR Could not determine hostname or ip address; proceeding.

agent.py: error: argument –hostname is required

Make sure your hostnames match:

/etc/sysconfig/network

/etc/hosts

notably, check the hosts file on the machine on which you’re running Cloudera Manager, e.g. if its hosts file has a different hostname for the machine at 192.168.1.222 than what that machine has in either its /etc/hosts or /etc/sysconfig/network files.