Why does not respond by name in Centos 6?

Question

Ping

I deal with VPS and ran into this problem:
When I enter the ping yandex.ru command, it says: ping: unknown host yandex.ru
If I ping by IP, then everything goes well.
How can this problem be solved?
Firewall doesn't seem to matter:
systemctl status firewalld
-bash: systemctl: command not found

Answer 1

Check the DNS setting
# vi /etc/resolv.conf nameserver
8.8.8.8 # Replace with your nameserver ip
nameserver 8.8.4.4 # Replace with your nameserver ip The
DNS server address can also be specified in
# vi /etc/sysconfig/network-scripts /ifcfg-eth0