How to fix error can’t ping any hostname on Linux?
[root@tutorialspots ~]# ping google.com ping: google.com: Name or service not known
But you can ping IP. So strange! How to fix this error?
Simple, you only need flush DNS cache.
You can read this artice: How to flush DNS cache on CentOS
Example:
service named restart
Now you can ping hostname
[root@tutorialspots ~]# ping google.com PING google.com (172.217.12.78) 56(84) bytes of data. 64 bytes from dfw28s05-in-f14.1e100.net (172.217.12.78): icmp_seq=1 ttl=57 time=10.8 ms 64 bytes from dfw28s05-in-f14.1e100.net (172.217.12.78): icmp_seq=2 ttl=57 time=10.6 ms 64 bytes from dfw28s05-in-f14.1e100.net (172.217.12.78): icmp_seq=3 ttl=57 time=10.7 ms
If you get this error:
[root@tutorialspots ~]# service named restart Redirecting to /bin/systemctl restart named.service Authorization not available. Check if polkit service is running or see debug message for more information.
You must reboot your server.
