ping: unknown host

In the resolv.conf file, we have the ip address of our name servers. If for some reason, we may have missed the name server value in the resolv.conf file. Then we will have the above error message. To solve this problem, you need to go through the below steps:
Go to the below file:

/etc/resolv.conf

And write the following, this is a sample file, you need to write your server name and the name server ip addresses.

search cyberciti.biz
nameserver 202.54.1.10
nameserver 202.54.1.11

For example, for Rackspace, we have the below name server ip addresses :

nameserver 173.203.4.8
nameserver 173.203.4.9

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