this post was submitted on 25 Apr 2025
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Kubernetes

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How to get kubernetes to add all its internal dns entries to your own dns server (lemmy.zip)
submitted 2 weeks ago by SpiderUnderUrBed@lemmy.zip to c/kubernetes@programming.dev
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By this I mean, I have a powerdns server running in my cluster, I would like Kubernetes to add/update dns entries in my dns server to reflect all services or any domains that would be used within the cluster, this is to fix a current issue I am having, and for general control and centralization purposes.

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[โ€“] jbloggs777@discuss.tchncs.de 1 points 2 weeks ago* (last edited 2 weeks ago) (1 children)

Do you have any NetworkPolicies configured that could block ingress (to kubedns, in kube-system) or egress (in your namespace) ? If any ingress or egress networkpolicy matches a pod, it flips from AllowByDefault to DenyByDefault.

You should also do kubectl get service and kubectl get endpoints in kube-system, as well as kubectl get pods | grep -i dns

[โ€“] SpiderUnderUrBed@lemmy.zip 1 points 2 weeks ago 
spiderunderurbed@raspberrypi:~/k8s $ kubectl get networkpolicy -A
No resources found
spiderunderurbed@raspberrypi:~/k8s $

No networkpolicies.

spiderunderurbed@raspberrypi:~/k8s $ kubectl get pods -A | grep -i dns
default                      pdns-admin-mysql-854c4f79d9-wsclq                         1/1     Running            1 (2d22h ago)    4d9h
default                      pdns-mysql-master-6cddc8cd54-cgbs9                        1/1     Running            0                7h49m
kube-system                  coredns-ff8999cc5-hchq6                                   1/1     Running            1 (2d22h ago)    4d11h
kube-system                  svclb-pdns-mysql-master-1993c118-8xqzh                    3/3     Running            0                4d
kube-system                  svclb-pdns-mysql-master-1993c118-whf5g                    3/3     Running            0                124m
spiderunderurbed@raspberrypi:~/k8s $

Ignore powerdns, its just extra stuff, but yeah coredns is running

spiderunderurbed@raspberrypi:~/k8s $  kubectl get endpoints  -n kube-system
NAME             ENDPOINTS                                              AGE
kube-dns         172.16.246.61:53,172.16.246.61:53,172.16.246.61:9153   4d11h
metrics-server   172.16.246.45:10250                                    4d11h
traefik          <none>                                                 130m
spiderunderurbed@raspberrypi:~/k8s $

^ endpoints and services:

spiderunderurbed@raspberrypi:~/k8s $ kubectl get svc -n kube-system
NAME             TYPE           CLUSTER-IP      EXTERNAL-IP   PORT(S)                      AGE
kube-dns         ClusterIP      10.43.0.10      <none>        53/UDP,53/TCP,9153/TCP       4d11h
metrics-server   ClusterIP      10.43.67.112    <none>        443/TCP                      4d11h
traefik          LoadBalancer   10.43.116.221   <pending>     80:31123/TCP,443:30651/TCP   131m
spiderunderurbed@raspberrypi:~/k8s $