Stable k3d coredns customization on restarts

[johgoe]

Description

Currently core dns have to be patched every time by kyma cli again, to make it work. If a k3d is restarted itself, the cluster is broken an must be patched again. This can be fixed if the core dns is not patched but using s custom config map.

Reasons
K3D writes the coredns config map on every restart to fix the new ip addresses of every node.

See this PR to get an idea how to fix the kyma coredns settings without patching it on every restart:
k3s-io/k3s#4397

Attachments

[kyma-bot]

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[johgoe]

Patch for

rewrite name regex (.*)\.local\.kyma\.dev istio-ingressgateway.istio-system.svc.cluster.local

data:
  Corefile: |
    .:53 {
        errors
        health
        rewrite name regex (.*)\.local\.kyma\.dev istio-ingressgateway.istio-system.svc.cluster.local
        ready
        kubernetes cluster.local in-addr.arpa ip6.arpa {
          pods insecure
          fallthrough in-addr.arpa ip6.arpa
        }
        hosts /etc/coredns/NodeHosts {
          reload 1s
          fallthrough
        }
        prometheus :9153
        forward . /etc/resolv.conf
        cache 30
        loop
        reload
        loadbalance
    }

is still required after System restart to get a core dns config. Why coredns overrides should be done with the override meachnism from k3d.

[kyma-bot]

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@kyma-bot: Closing this issue.

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@kyma-bot: Closing this issue.

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/lifecycle stale

[janmedrek]

Stopping the development according to: kyma-project/community#872