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CoreDNS.md

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CoreDNS
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03-11-2021

CoreDNS is one of many [[DNS Server]] solutions, which is particuarily interesting because it's used for [[DNS Resolution in Kubernetes]]. Most of its functionality is implemented through plugins, so it's very flexible and extensible by nature.

Let's see how we can configure a host to be a DNS Server.

To start, you can download the executable and execute it:

wget https://github.com/coredns/coredns/releases/download/v1.8.4/coredns_1.8.4_linux_amd64.tgz 
#> coredns_1.8.4_linux_amd64.tgz 

tar -xzvf coredns_1.8.4_linux_amd64.tgz 
#> coredns 

./coredns 
#> .:53 
#> [INFO] CoreDNS-1.8.4 
#> [INFO] linux/amd64, go1.12 
#> ...

To configure the CoreDNS to have names and addresses that we want, we use Corefile - a file for configuring CoreDNS. In there we can set it to read our local /etc/hosts file like so:

cat >> Corefile 
{ 
	hosts /etc/hosts 
}

The hosts section that we specified in Corefile is actually a plugin.

Status: #💡

References: