What Is DNS Server in Linux in CentOS 7?


Angela Bailey

What Is DNS Server in Linux in CentOS 7?

Are you wondering what a DNS server is in Linux and how it works in CentOS 7? In this tutorial, we will delve into the world of DNS servers, their importance, and how to configure them in CentOS 7.

Understanding DNS Servers

DNS stands for Domain Name System. It is a decentralized naming system that translates domain names (such as www.example.com) into IP addresses (such as This translation allows users to access websites and other internet resources by using memorable domain names instead of numeric IP addresses.

The DNS system functions as a distributed database that stores information related to domain names and their associated IP addresses. When you type a website’s URL into your browser, your computer queries a DNS server to obtain the corresponding IP address associated with that URL.

Role of DNS Servers in CentOS 7

In CentOS 7, a DNS server plays a crucial role in resolving domain names to their respective IP addresses. By configuring a local DNS server on your CentOS 7 machine, you can improve network performance by caching frequently accessed information and reducing reliance on external DNS servers.

A local DNS server also enables you to create custom domain names for your local network, making it easier for devices within the network to communicate with one another using user-friendly hostnames instead of complex IP addresses.

Configuring a DNS Server in CentOS 7

To configure a DNS server in CentOS 7, follow these steps:

  • Step 1: Install the necessary packages by running the command yum install bind bind-utils.
  • Step 2: Edit the main configuration file /etc/named.conf to define your DNS server’s settings and zones.
  • Step 3: Create zone files for each domain or subdomain you wish to host on your DNS server. These files contain DNS resource records that map domain names to IP addresses.
  • Step 4: Start the DNS service by running the command systemctl start named.

    You can also enable the service to start automatically at boot by running systemctl enable named.

  • Step 5: Configure your network settings to use the local DNS server as the primary DNS resolver. This can be done by editing the file /etc/resolv.conf.

Troubleshooting DNS Server Issues in CentOS 7

If you encounter any issues with your DNS server in CentOS 7, here are a few troubleshooting tips:

  • Check network connectivity: Ensure that your CentOS 7 machine has a stable internet connection and can communicate with external DNS servers.
  • Verify configuration files: Double-check your DNS server’s configuration files for any syntax errors or typos.
  • Check firewall settings: Make sure that your firewall allows incoming connections on port 53, which is used by DNS servers.

In conclusion, a DNS server is a critical component of any Linux system, including CentOS 7. By understanding its role and configuring it correctly, you can ensure efficient domain name resolution and improved network performance. Remember to troubleshoot any DNS server issues promptly to maintain a reliable and seamless browsing experience.

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