CODEWITHSUNDEEP
dnskubernetesgoogle-kubernetes-enginegoogle-compute-engine
Hills of Eternity
Hills of Eternity

Reputation: 23

DNS issues in GCE & k8s

i use google k8s as a service with preemptible instances. i faced with problem when google preempt one of node which serving kube-dns pod i get 5-7 mins failures in all another pods with "Cannot resolve" error. I tried run second kube-dns pod but sometime both dns is running on the same node and i get failures again. I tried define nodeSelector for kube-dns pod but got error

Pod "kube-dns-2185667875-8b42l" is invalid: spec: Forbidden: pod updates may not change fields other than `containers[*].image` or `spec.activeDeadlineSeconds`

There is a possibility to run dns pods on different nodes redundantly? Maybe there are any best practice?

Upvotes: 0

Views: 258

Answers (1)

Radek 'Goblin' Pieczonka
Radek 'Goblin' Pieczonka

Reputation: 22892

You can not modify POD like this, you need to modify your Deployment. Also you might want to look into pod anti-affinity to separate your pods in the same deployment in a way that will never schedule them on the same node. Alternatively, you can also switch from Deployment to DaemonSet to get exactly one pod running per node in cluster.

Upvotes: 1

Related Questions