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I am installing Cloudera Manager in my system(14.04/64b).

While installing at the final step, before finish installation I got some ERRORs in validation as shown below,

enter image description here

errors in above page are,

  1. ERROR 1

    Individual hosts resolved their own hostnames correctly.

    Host localhost expected to have name localhost but resolved (InetAddress.getLocalHost().getHostName()) itself to arul-pc.

  2. ERROR 2

    The following errors were found while checking /etc/hosts...

    • The hostname localhost is not the first match for address 127.0.0.1 in /etc/hosts on localhost. Instead, arul-pc is the first match. The FQDN must be the first entry in /etc/hosts for the corresponding IP.
    • In /etc/hosts on localhost, the IP 127.0.0.1 is present multiple times. A given IP should only be listed once.

Note(info)::

In my /etc/hosts,

127.0.0.1       localhost
127.0.0.1       arul-pc

# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

Note 2(my try)::

I tried to avoid arul-pc from /etc/hosts/ as,

127.0.0.1       localhost
#127.0.0.1      arul-pc

after saved and Run again, Error 2 cleared, but Error 1 changed as,

Individual hosts resolved their own hostnames correctly.

Host localhost failed to execute InetAddress.getLocalHost() with error: arul-pc: arul-pc. This typically means that the hostname could not be resolved.

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The configuration in /etc/hosts that removed the warning for me was

#127.0.0.1       localhost
192.168.13.27  cloudera2

localhost is commented and I only use the machine ip the machine hostname is also cloudera2

if you don't want to expose your machine, then use only

127.0.0.1  cloudera2

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