Centos7 system configuration DNS service

There are many different ways to configure DNS services in CentOS 7 systems. This article will introduce the two most common methods: using NetworkManager and using the resolv.conf file.

Use NetworkManager to configure DNS service

NetworkManager is a common network manager that can help users manage system network configuration. The following are the steps to configure DNS service using NetworkManager:

1. Open the NetworkManager configuration file:

   $ sudo vi /etc/NetworkManager/NetworkManager.conf

2. Add the following content to the file:

   [main]dns=none[ipv4]dns-search=example.commethod=auto[ipv6]dns-search=example.commethod=auto

   The above configuration means using NetworkManager to manage network settings, but disabling DNS settings. In addition, the default DNS search domain is configured as example.com.

3. Restart the NetworkManager service:

   $ sudo systemctl restart NetworkManager

4. Confirm that the DNS service has been configured successfully:

   $ nmcli dev show | grep DNS

   The output should contain the configured DNS search domains and DNS servers.

Use the resolv.conf file to configure the DNS service

The resolv.conf file is the most common method used to configure DNS services. Here are the steps to configure the DNS service using the resolv.conf file:

1. Open the resolv.conf file:

   $ sudo vi /etc/resolv.conf

2. Add the following content to the file:

   nameserver 8.8.8.8nameserver 8.8.4.4

   The above configuration uses Google public DNS server as the default DNS server.

3. Save and close the file.

4. Confirm that the DNS service has been configured successfully:

   $ nslookup example.com

   If the domain name can be successfully resolved, the DNS service has been configured successfully.

In short, the above two methods are commonly used methods to configure DNS services on CentOS 7 systems. Users can choose one of the methods for configuration according to their own needs.

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