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Opscenter shows nodes as connected but with "unknown" hostname

Summary

Opscenter UI will show the node hostname as "unknown"

Symptoms

The user will be showing all agents connected in the UI and all stats will be showing up for the node like load, disc space etc but the hostname will show up as "unknown"

Screen_Shot_2015-04-14_at_20.25.01.png

Cause

The node had incorrect permissions on /etc/hosts.

$ ls -l /etc/hosts
-rw-r-----. 1 root root 177 Aug 19  2014 /etc/hosts

Solution

Ensure /etc/hosts has at least 644 permissions

$ ls -l /etc/hosts
-rw-r--r--. 1 root root 177 Aug 19  2014 /etc/hosts
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