Configuring BIND as a caching or forwarding DNS server on CentOS 7 is a useful way to improve the performance and reliability of your network’s DNS resolution. In this tutorial, we will walk through the steps to set up BIND as a caching or forwarding DNS server on CentOS 7.
Prerequisites
Before we begin, make sure you have the following:
- A CentOS 7 server with root access
- BIND (Berkeley Internet Name Domain) software installed on your CentOS 7 system
Step 1: Configure BIND
The first step is to configure BIND by editing its configuration file. Open the named.conf file located in the /etc/named directory using a text editor:
# vi /etc/named.conf
Note: Make sure you have root privileges to edit this file.
Configure Caching DNS Server
If you want to configure BIND as a caching DNS server, add the following lines inside the options section of the configuration file:
options {
..
recursion yes;
allow-recursion { localhost; };
.
};
- recursion: Enables recursive queries on this DNS server.
- allow-recursion: Specifies which clients are allowed to make recursive queries. In this example, only localhost is allowed.
Configure Forwarding DNS Server
If you want to configure BIND as a forwarding DNS server, add the following lines inside the options section of the configuration file:
options {
.
forwarders {
8.8.8;
8.4.4;
};
.
};
- forwarders: Specifies the IP addresses of the DNS servers to which queries should be forwarded.
Step 2: Start and Enable BIND
After configuring BIND, start the service and enable it to start automatically at boot:
# systemctl start named
# systemctl enable named
Step 3: Configure Firewall
If you have a firewall enabled on your CentOS 7 server, you need to allow DNS traffic through it. Run the following commands to open the necessary ports:
# firewall-cmd --permanent --add-service=dns
# firewall-cmd --reload
Step 4: Test DNS Resolution
To test if your caching or forwarding DNS server is working correctly, use the dig command to perform a DNS lookup:
# dig example.com
If you receive a valid response with the IP address of example.com, then your BIND server is functioning properly.
Conclusion
In this tutorial, we learned how to configure BIND as a caching or forwarding DNS server on CentOS 7. This setup can greatly improve the performance and reliability of DNS resolution within your network.
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