How to install CoreDNS on Ubuntu Server Latest

CoreDNS is a DNS server that can serve as an authoritative DNS server, a recursive DNS resolver, and a DNS proxy. In this tutorial, we will show you how to install CoreDNS on Ubuntu Server latest.

Prerequisites

Before proceeding with the installation, make sure your Ubuntu Server is updated and upgraded to the latest version.

sudo apt update
sudo apt upgrade

Step 1: Install CoreDNS

1. First, download CoreDNS by running the following command:

   wget https://github.com/coredns/coredns/releases/download/v1.8.3/coredns_1.8.3_linux_amd64.tgz
   

2. Extract the downloaded package by running the following command:

   tar xvf coredns_1.8.3_linux_amd64.tgz
   

3. Move the extracted binary to /usr/local/bin directory.

   sudo mv coredns /usr/local/bin/
   

Step 2: Configure CoreDNS

Next, you need to configure CoreDNS to serve DNS requests. You can use the default configuration file provided by CoreDNS or create your own configuration file.

1. Create a file named Corefile in the /etc/coredns directory.

   sudo mkdir /etc/coredns
   sudo nano /etc/coredns/Corefile
   

2. Add the following configuration to Corefile:

   .:53 {
       log
       errors
       health
       kubernetes cluster.local in-addr.arpa ip6.arpa {
           pods insecure
           upstream
           fallthrough in-addr.arpa ip6.arpa
       }
       prometheus :9153
       forward . /etc/resolv.conf
       cache 30
       tls_cert_path /path/to/tls.crt
       tls_key_path /path/to/tls.key
   }
   

   This configuration enables CoreDNS to serve DNS requests and provides some additional functionality such as logging, health checks, and caching.

3. Save and exit the file.

Step 3: Start CoreDNS

1. To start CoreDNS as a system service, you need to create a systemd unit file.

   sudo nano /etc/systemd/system/coredns.service
   

2. Add the following configuration to coredns.service:

   [Unit]
   Description=CoreDNS DNS Server
   After=network.target
   
   [Service]
   Type=simple
   ExecStart=/usr/local/bin/coredns -conf /etc/coredns/Corefile
   
   [Install]
   WantedBy=multi-user.target
   

3. Save and exit the file.

4. Reload systemd configuration.

   sudo systemctl daemon-reload
   

5. Start CoreDNS.

   sudo systemctl start coredns
   

6. Check the status of CoreDNS.

   sudo systemctl status coredns
   

   The output should show that CoreDNS is active and running.

Conclusion

You have successfully installed and configured CoreDNS on Ubuntu Server latest. You can now use it as a DNS resolver and proxy for your applications.

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