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zaidsasa / vagrant-kubernetes-cluster

A Kubernetes practice cluster for CKA, CKAD, and CKS certifications using Vagrant and Ansible.
MIT License
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CoreDNS is not working properly #27

Open zaidsasa opened 1 month ago

zaidsasa commented 1 month ago

After a running DNS verifications steps. it seems that the CoreDNS is not working as expected.

Reference: https://kubernetes.io/docs/tasks/administer-cluster/dns-debugging-resolution

Log: 

kubectl logs -f -l k8s-app=kube-dns -n kube-system
[INFO] plugin/kubernetes: waiting for Kubernetes API before starting server
[INFO] plugin/kubernetes: waiting for Kubernetes API before starting server
[INFO] plugin/kubernetes: waiting for Kubernetes API before starting server
[INFO] plugin/kubernetes: waiting for Kubernetes API before starting server
[INFO] plugin/kubernetes: waiting for Kubernetes API before starting server
[WARNING] plugin/kubernetes: starting server with unsynced Kubernetes API
.:53
[INFO] plugin/reload: Running configuration SHA512 = 591cf328cccc12bc490481273e738df59329c62c0b729d94e8b61db9961c2fa5f046dd37f1cf888b953814040d180f52594972691cd6ff41be96639138a43908
CoreDNS-1.11.1
linux/amd64, go1.20.7, ae2bbc2
[INFO] plugin/kubernetes: waiting for Kubernetes API before starting server
[INFO] plugin/kubernetes: waiting for Kubernetes API before starting server
[INFO] plugin/kubernetes: waiting for Kubernetes API before starting server
[INFO] plugin/kubernetes: waiting for Kubernetes API before starting server
[INFO] plugin/kubernetes: waiting for Kubernetes API before starting server
[WARNING] plugin/kubernetes: starting server with unsynced Kubernetes API
.:53
[INFO] plugin/reload: Running configuration SHA512 = 591cf328cccc12bc490481273e738df59329c62c0b729d94e8b61db9961c2fa5f046dd37f1cf888b953814040d180f52594972691cd6ff41be96639138a43908
CoreDNS-1.11.1
linux/amd64, go1.20.7, ae2bbc2
[INFO] plugin/ready: Still waiting on: "kubernetes"
[INFO] plugin/ready: Still waiting on: "kubernetes"
[INFO] plugin/ready: Still waiting on: "kubernetes"
[INFO] plugin/ready: Still waiting on: "kubernetes"
[INFO] plugin/ready: Still waiting on: "kubernetes"
[INFO] plugin/ready: Still waiting on: "kubernetes"
[INFO] plugin/kubernetes: pkg/mod/k8s.io/client-go@v0.27.4/tools/cache/reflector.go:231: failed to list *v1.Namespace: Get "https://10.96.0.1:443/api/v1/namespaces?limit=500&resourceVersion=0": dial tcp 10.96.0.1:443: i/o timeout
[INFO] plugin/kubernetes: pkg/mod/k8s.io/client-go@v0.27.4/tools/cache/reflector.go:231: failed to list *v1.Service: Get "https://10.96.0.1:443/api/v1/services?limit=500&resourceVersion=0": dial tcp 10.96.0.1:443: i/o timeout
[INFO] plugin/kubernetes: pkg/mod/k8s.io/client-go@v0.27.4/tools/cache/reflector.go:231: failed to list *v1.Namespace: Get "https://10.96.0.1:443/api/v1/namespaces?limit=500&resourceVersion=0": dial tcp 10.96.0.1:443: i/o timeout
[INFO] plugin/kubernetes: Trace[1865396114]: "Reflector ListAndWatch" name:pkg/mod/k8s.io/client-go@v0.27.4/tools/cache/reflector.go:231 (28-May-2024 09:26:50.461) (total time: 30060ms):
[INFO] plugin/kubernetes: Trace[555358322]: "Reflector ListAndWatch" name:pkg/mod/k8s.io/client-go@v0.27.4/tools/cache/reflector.go:231 (28-May-2024 09:26:50.463) (total time: 30057ms):
Trace[555358322]: ---"Objects listed" error:Get "https://10.96.0.1:443/api/v1/services?limit=500&resourceVersion=0": dial tcp 10.96.0.1:443: i/o timeout 30045ms (09:27:20.508)
Trace[555358322]: [30.057302013s] [30.057302013s] END
[ERROR] plugin/kubernetes: pkg/mod/k8s.io/client-go@v0.27.4/tools/cache/reflector.go:231: Failed to watch *v1.Service: failed to list *v1.Service: Get "https://10.96.0.1:443/api/v1/services?limit=500&resourceVersion=0": dial tcp 10.96.0.1:443: i/o timeout
[INFO] plugin/kubernetes: pkg/mod/k8s.io/client-go@v0.27.4/tools/cache/reflector.go:231: failed to list *v1.EndpointSlice: Get "https://10.96.0.1:443/apis/discovery.k8s.io/v1/endpointslices?limit=500&resourceVersion=0": dial tcp 10.96.0.1:443: i/o timeout
Trace[1865396114]: ---"Objects listed" error:Get "https://10.96.0.1:443/api/v1/namespaces?limit=500&resourceVersion=0": dial tcp 10.96.0.1:443: i/o timeout 30048ms (09:27:20.509)
Trace[1865396114]: [30.060042546s] [30.060042546s] END
[INFO] plugin/kubernetes: Trace[1298336724]: "Reflector ListAndWatch" name:pkg/mod/k8s.io/client-go@v0.27.4/tools/cache/reflector.go:231 (28-May-2024 09:26:50.488) (total time: 30037ms):
Trace[1298336724]: ---"Objects listed" error:Get "https://10.96.0.1:443/apis/discovery.k8s.io/v1/endpointslices?limit=500&resourceVersion=0": dial tcp 10.96.0.1:443: i/o timeout 30020ms (09:27:20.508)
Trace[1298336724]: [30.037187505s] [30.037187505s] END
[ERROR] plugin/kubernetes: pkg/mod/k8s.io/client-go@v0.27.4/tools/cache/reflector.go:231: Failed to watch *v1.EndpointSlice: failed to list *v1.EndpointSlice: Get "https://10.96.0.1:443/apis/discovery.k8s.io/v1/endpointslices?limit=500&resourceVersion=0": dial tcp 10.96.0.1:443: i/o timeout
[ERROR] plugin/kubernetes: pkg/mod/k8s.io/client-go@v0.27.4/tools/cache/reflector.go:231: Failed to watch *v1.Namespace: failed to list *v1.Namespace: Get "https://10.96.0.1:443/api/v1/namespaces?limit=500&resourceVersion=0": dial tcp 10.96.0.1:443: i/o timeout
[INFO] plugin/kubernetes: pkg/mod/k8s.io/client-go@v0.27.4/tools/cache/reflector.go:231: failed to list *v1.EndpointSlice: Get "https://10.96.0.1:443/apis/discovery.k8s.io/v1/endpointslices?limit=500&resourceVersion=0": dial tcp 10.96.0.1:443: i/o timeout
[INFO] plugin/kubernetes: Trace[1913296934]: "Reflector ListAndWatch" name:pkg/mod/k8s.io/client-go@v0.27.4/tools/cache/reflector.go:231 (28-May-2024 09:26:50.489) (total time: 30043ms):
Trace[1913296934]: ---"Objects listed" error:Get "https://10.96.0.1:443/apis/discovery.k8s.io/v1/endpointslices?limit=500&resourceVersion=0": dial tcp 10.96.0.1:443: i/o timeout 30018ms (09:27:20.508)
Trace[1913296934]: [30.043722966s] [30.043722966s] END
[ERROR] plugin/kubernetes: pkg/mod/k8s.io/client-go@v0.27.4/tools/cache/reflector.go:231: Failed to watch *v1.EndpointSlice: failed to list *v1.EndpointSlice: Get "https://10.96.0.1:443/apis/discovery.k8s.io/v1/endpointslices?limit=500&resourceVersion=0": dial tcp 10.96.0.1:443: i/o timeout
[INFO] plugin/kubernetes: pkg/mod/k8s.io/client-go@v0.27.4/tools/cache/reflector.go:231: failed to list *v1.Service: Get "https://10.96.0.1:443/api/v1/services?limit=500&resourceVersion=0": dial tcp 10.96.0.1:443: i/o timeout
[INFO] plugin/kubernetes: Trace[2131551246]: "Reflector ListAndWatch" name:pkg/mod/k8s.io/client-go@v0.27.4/tools/cache/reflector.go:231 (28-May-2024 09:26:50.488) (total time: 30048ms):
Trace[2131551246]: ---"Objects listed" error:Get "https://10.96.0.1:443/api/v1/services?limit=500&resourceVersion=0": dial tcp 10.96.0.1:443: i/o timeout 30019ms (09:27:20.508)
Trace[2131551246]: [30.048818375s] [30.048818375s] END
[INFO] plugin/kubernetes: Trace[1498410255]: "Reflector ListAndWatch" name:pkg/mod/k8s.io/client-go@v0.27.4/tools/cache/reflector.go:231 (28-May-2024 09:26:50.460) (total time: 30061ms):
Trace[1498410255]: ---"Objects listed" error:Get "https://10.96.0.1:443/api/v1/namespaces?limit=500&resourceVersion=0": dial tcp 10.96.0.1:443: i/o timeout 30047ms (09:27:20.508)
Trace[1498410255]: [30.061616064s] [30.061616064s] END
[ERROR] plugin/kubernetes: pkg/mod/k8s.io/client-go@v0.27.4/tools/cache/reflector.go:231: Failed to watch *v1.Namespace: failed to list *v1.Namespace: Get "https://10.96.0.1:443/api/v1/namespaces?limit=500&resourceVersion=0": dial tcp 10.96.0.1:443: i/o timeout
[ERROR] plugin/kubernetes: pkg/mod/k8s.io/client-go@v0.27.4/tools/cache/reflector.go:231: Failed to watch *v1.Service: failed to list *v1.Service: Get "https://10.96.0.1:443/api/v1/services?limit=500&resourceVersion=0": dial tcp 10.96.0.1:443: i/o timeout
zaidsasa commented 1 month ago

a work around fix implemented in #30

zaidsasa commented 1 month ago

Related to issue: https://github.com/projectcalico/calico/issues/8811