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Flux Lookup no such host

What

{"level":"error","ts":"2023-10-28T17:17:09.299Z","msg":"unable to record event","name":"flux-system","namespace":"flux-system","reconciler kind":"GitRepository","error":"POST http://notification-controller.flux-system.svc.cluster.local./ giving up after 5 attempt(s): Post \"http://notification-controller.flux-system.svc.cluster.local./\": dial tcp: lookup notification-controller.flux-system.svc.cluster.local. on 10.43.0.10:53: no such host"}

How to fix

You are most likely getting this error because your Kubernetes cluster is not using cluster.local as the Cluster domain

How to find Cluster Domain

View the config map for CoreDNS

kubectl get cm/coredns -o yaml

In there you will find the below

apiVersion: v1
data:
  Corefile: |
    .:53 {
        errors
        health
        ready
        kubernetes cluster.bread in-addr.arpa ip6.arpa {
          pods insecure
          fallthrough in-addr.arpa ip6.arpa
        }

kubectl get deployment/kube-dns -o yaml

And locate the below part like this

      containers:
      - args:
        - --domain=cluster.local.
        - --dns-port=10053
        - --config-dir=/kube-dns-config
        - --v=2

Bootstrap Flux

Now when you run the bootstrap command, add the --cluster-domain field

flux bootstrap github \
  --owner=$GITHUB_USER \
  --repository=fleet-infra \
  --branch=main \
  --path=./clusters/my-cluster \
+  --cluster-domain cluster.bread \
  --personal
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