[Release-1.26] - Core DNS missing NodeHosts key in Configmap

[brandond]

Backport fix for Core DNS missing NodeHosts key in Configmap

• Core DNS missing NodeHosts key in Configmap #9274

[fmoral2]

Validated on Version:

-$ k3s version v1.26.13+k3s-62448e1e (62448e1e)

Environment Details

Infrastructure
Cloud EC2 instance

Node(s) CPU architecture, OS, and Version:
NAME="Oracle Linux Server"
VERSION="8.9"
ID="ol"
ID_LIKE="fedora"

Cluster Configuration:
1 node servers

Steps to validate the fix

1. Install k3s from airgap releases
2. Start k3s with those flags:

 --node-ip={internal-ip} --flannel-iface={proper-interface} --write-kubeconfig-mode=644 --kube-apiserver-arg=service-node-port-range=30000-30100 --secrets-encryption --disable=traefik --disable=servicelb --disable-helm-controller --disable-network-policy --kubelet-arg cloud-provider=external --debug

3. Validate nodes and pods are all ok
4. Validate that coredns is starting and running correctly

Validation Results:

 
$ k3s -v
k3s version v1.26.13+k3s-62448e1e (62448e1e)
go version go1.20.13



~$ kgn
NAME               STATUS   ROLES                       AGE   VERSION
ip-1                Ready    control-plane,etcd,master   15s   v1.26.13+k3s-62448e1e

 ~$ kgp -A
NAMESPACE     NAME                                      READY   STATUS    RESTARTS   AGE
kube-system   coredns-59b4f5bbd5-zdpqk                  1/1     Running   0          13s
kube-system   local-path-provisioner-7d94548cbf-hdclf   1/1     Running   0          13s
kube-system   metrics-server-68cf49699b-sz565           0/1     Running   0          13s