Page Comparison

The Cloudera install will get very upset if the hostnames are in anyway complicated - eg multiple instances of the same root hostname with different FQDNs, the same hostname allocated to different IP addresses etc. The ideal seems to be a single domain with DNS and then just put localhost in the /etc/hosts files. Otherwise this web page (for CDH4 but the advice also holds for CDH3) explains how to set up and verify the hostnames. One thing that guide doesn't say but does appear to be the case if DNS isn't set up is that the short version of the hostname should always be present in /etc/hosts after the FQDN one.