You may find the “can’t resolve hostname” or “temporary failure in name resolution” error when using retrieval command like wget, cURL, ping or nslookup. There are many reasons why these commands can cause an error, including file corruption. For the sake of brevity, we look towards commonalities between these commands to solve the issue.
These commands connect to the Internet using gateways to communicate and provide information. If the connection from your local machine, in this case, a CentOS server, is disconnected you’ll likely run into issues trying to access the world wide web. In this troubleshooting tutorial, we’ll show you some common solutions to connectivity issues.
Step 1: Amongst many other configuration tasks, the resolv.conf file is used to resolve DNS requests. Manually editing the resolv.conf file to configure name resolution will only do so temporarily. The Network Manager controls this essential /etc/resolv.conf file to create permanent changes. So, we’ll first stop and disable the Network Manager:
chkconfig NetworkManager off; service NetworkManager stop
Step 2: The method for permanent changes is to edit the /etc/sysconfig/network-scripts/ifcfg-eth0 file instead of resolv.conf file. Open the file:
Next, we’ll set our DNS IP’s to use Google’s Public DNS (18.104.22.168 & 22.214.171.124).
Save and quit the file using ESC and :wq.
Step 3: Enable and restart your network, using the commands associated with your server version.
CentOS 6, CloudLinux 6, RHEL 6:
chkconfig network on
service network start
CentOS 7, CloudLinux 7, RHEL 7:
systemctl enable network.service
systemctl start network.service
Step 4: Test the reachability of a host by using ping, curl, wget or any testing tool of your choice. In our example, we’ve successfully ping’d Google!
PING google.com (126.96.36.199) 56(84) bytes of data.
64 bytes from lga15s46-in-f14.1e100.net (188.8.131.52): icmp_seq=1 ttl=57 time=6.65 ms
64 bytes from lga15s46-in-f14.1e100.net (184.108.40.206): icmp_seq=2 ttl=57 time=6.68 ms
64 bytes from lga15s46-in-f14.1e100.net (220.127.116.11): icmp_seq=3 ttl=57 time=6.68 ms
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