Installing CoreDNS on Clear Linux Latest

CoreDNS is a DNS server that can serve as an alternative to traditional DNS servers like BIND or dnsmasq. It is a versatile DNS server that can be used as a caching server, as a load balancer, or even as a proxy. In this tutorial, we will show you how to install CoreDNS on Clear Linux latest.

Prerequisites

A Clear Linux instance, preferably latest version.
Access to the terminal and sudo privileges.

Steps to install CoreDNS on Clear Linux

Update your system packages to the latest version using the following command:
```
sudo swupd update
```
Install the coredns package:
```
sudo swupd bundle-add coredns
```
After the installation is complete, you can start the CoreDNS service using the following command:
```
sudo systemctl start coredns
```
To make the CoreDNS service start automatically at boot time, use the following command:
```
sudo systemctl enable coredns
```
This will ensure that the CoreDNS service starts automatically after a system reboot.

Configuring CoreDNS

After installing CoreDNS, you need to configure it to serve your DNS queries. You can modify the CoreDNS configuration file located at /etc/coredns/Corefile.

Use the following command to open CoreDNS configuration file:
```
sudo vi /etc/coredns/Corefile
```
Configure the DNS zones you wish to serve by adding the following lines to the file. Note: replace the values in curly brackets with your actual values.
```
{zone_name} {
   file /etc/coredns/{zone_name}.zone
}
```
You can define multiple zones to be served by adding additional blocks to the file.
Create the zone files for each zone by creating a new file under /etc/coredns/ directory with the name {zone_name}.zone.
```
sudo vi /etc/coredns/{zone_name}.zone
```
Add the following details:
```
$ORIGIN {zone_name}.
$TTL 1800
@ IN SOA ns1.{zone_name}. admin.{zone_name}. (
  {serial}
  3600
  1800
  604800
  1800 )
@ IN NS ns1.{zone_name}.
ns1 IN A {dns_ip}
```
This sets up the zone and NS records for your DNS server. Replace the values in the curly brackets with your actual values.
Save the configuration file and exit vi.
Restart the CoreDNS service to apply the changes:
```
sudo systemctl restart coredns
```

Conclusion

You have successfully installed and configured CoreDNS on Clear Linux. You can now configure your DNS clients to use CoreDNS as their DNS server.