PRVF-0002 : could not retrieve local node name

[oracle@racdr1 grid]$ ./runcluvfy.sh  stage -pre crsinst -n racdr1 -verbose

WARNING:
Could not access or create trace file path "/tmp/bootstrap/cv/log". Trace information could not be collected

PRVF-0002 : could not retrieve local node name
[oracle@racdr1 grid]$ hostname
racdr1.localdomain
[oracle@racdr1 grid]$

Getting above error while doing the cluster verify for oracle 12c GI.

For diagnosing I have done

[oracle@racdr1 grid]$ hostname --long
hostname: Unknown host
[oracle@racdr1 grid]$
[oracle@racdr1 grid]$
[oracle@racdr1 grid]$ hostname --long --verbose
gethostname()=`racdr1.localdomain'
Resolving `racdr1.localdomain' ...
hostname: Unknown host
[oracle@racdr1 grid]$

It should not say "Unknown host"

Lets check /etc/hosts file

[root@racdr1 ~]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
[root@racdr1 ~]#


what it turned out was the my dns setting were wrong basically once you change in /etc/resolv.conf then do the following so that it does not change after reboot.

[root@racdr1 ~]# chattr -i /etc/resolv.conf
update details and then
[root@racdr1 ~]# chattr +i /etc/resolv.conf


[oracle@racdr1 grid]$ hostname --long
racdr1.localdomain
[oracle@racdr1 grid]$
[oracle@racdr1 grid]$ hostname --long --verbose
gethostname()=`racdr1.localdomain'
Resolving `racdr1.localdomain' ...
Result: h_name=`racdr1.localdomain'
Result: h_addr_list=`192.168.56.111'
racdr1.localdomain
[oracle@racdr1 grid]$

Hurray !!!