Deploying Node-Local-DNS

Claudie doesn't deploy node-local-dns by default. In this section we'll walk through an example of how to deploy node-local-dns for a claudie created cluster.

1. Download nodelocaldns.yaml

Based on the kubernetes version you are using in your cluster download the nodelocaldns.yaml from the kubernetes repository

Make sure to download the YAML for the right kubernetes version, e.g. for kubernetes version 1.27 you would use:

wget https://raw.githubusercontent.com/kubernetes/kubernetes/release-1.27/cluster/addons/dns/nodelocaldns/nodelocaldns.yaml

2. Modify downloaded nodelocaldns.yaml

We'll need to replace the references to __PILLAR__DNS__DOMAIN__ and some of the references to __PILLAR__LOCAL__DNS__

To replace __PILLAR__DNS__DOMAIN__ execute:

sed -i "s/__PILLAR__DNS__DOMAIN__/cluster.local/g" nodelocaldns.yaml

To replace __PILLAR__LOCAL__DNS__ find the references and change it to 169.254.20.10 as shown below:

    ...
      containers:
      - name: node-cache
        image: registry.k8s.io/dns/k8s-dns-node-cache:1.22.20
        resources:
          requests:
            cpu: 25m
            memory: 5Mi
-       args: [ "-localip", "__PILLAR__LOCAL__DNS__,__PILLAR__DNS__SERVER__", "-conf", "/etc/Corefile", "-upstreamsvc", "kube-dns-upstream" ]
+       args: [ "-localip", "169.254.20.10", "-conf", "/etc/Corefile", "-upstreamsvc", "kube-dns-upstream" ]
        securityContext:
          capabilities:
            add:
            - NET_ADMIN
        ports:
        - containerPort: 53
          name: dns
          protocol: UDP
        - containerPort: 53
          name: dns-tcp
          protocol: TCP
        - containerPort: 9253
          name: metrics
          protocol: TCP
        livenessProbe:
          httpGet:
-           host: __PILLAR__LOCAL__DNS__
+           host: 169.254.20.10
            path: /health
            port: 8080
          initialDelaySeconds: 60
          timeoutSeconds: 5
    ...

3. Apply the modified manifest.

kubectl apply -f ./nodelocaldns.yaml