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

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

Extract the downloaded package by running the following command:
```
tar xvf coredns_1.8.3_linux_amd64.tgz
```
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.

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

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

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.

Save and exit the file.

Step 3: Start CoreDNS

To start CoreDNS as a system service, you need to create a systemd unit file.
```
sudo nano /etc/systemd/system/coredns.service
```

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

Save and exit the file.
Reload systemd configuration.
```
sudo systemctl daemon-reload
```
Start CoreDNS.
```
sudo systemctl start coredns
```
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.