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Questions tagged [coredns]

CoreDNS can run in place of the standard Kube-DNS in Kubernetes. Using the kubernetes middleware, CoreDNS will read zone data from a Kubernetes cluster.

201 questions
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4 answers

How to patch a ConfigMap in Kubernetes

Kubernetes ships with a ConfigMap called coredns that lets you specify DNS settings. I want to modify or patch a small piece of this configuration by adding: apiVersion: v1 kind: ConfigMap data: upstreamNameservers: | ["1.1.1.1", "1.0.0.1"] I…
Muhammad Rehan Saeed
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CoreDNS fails to run in Kubernetes cluster

I'm trying to setup a Kubernetes cluster, but I cannot get CoreDNS running. I've ran the following to start the cluster: sudo swapoff -a sudo sysctl net.bridge.bridge-nf-call-iptables=1 sudo kubeadm init mkdir -p $HOME/.kube sudo cp -i…
jvj
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How can I get CoreDNS to resolve on my Raspberry Pi Kubernetes cluster?

I've followed a number of online tutorials to set up a Kubernetes cluster on four Raspberry Pi 4s. I ended up using Flannel as the networking plugin as that seems to be the only one that actually works on RPi, with a pod network CIDR of…
soapergem
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7
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1 answer

Kubernetes pod resolve external kafka hostname in coredns not as hostaliases inside pod

I am having spring boot app where in application.property we are specifying below properties. kafka is installed on remote machine with self-signed certificate (outside the kubernete…
user1184777
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7
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1 answer

Kubernetes DNS intermittently failing with kube-dns service and CoreDNS pods seeming OK

We have a Kubernetes cluster with 1 master and 3 nodes managed by kops that we use for our application deployment. We have minimal pod-to-pod connectivity but like the autoscaling features in Kubernetes. We've been using this for the past few months…
Ruby
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7
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3 answers

Flush CoreDNS Cache on Kubernetes Cluster

How to flush CoreDNS Cache on kubernetes cluster? I know it can be done by deleting the CoreDNS pods, but is there a proper way to to the cache flush ?
Fauzan
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2 answers

How do I force Kubernetes CoreDNS to reload its Config Map after a change?

I'm running Kubernetes 1.11, and trying to configure the Kubernetes cluster to check a local name server first. I read the instructions on the Kubernetes site for customizing CoreDNS, and used the Dashboard to edit the system ConfigMap for CoreDNS.…
E. Wittle
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1 answer

How to change running pods limits in Kubernetes?

I have a self made Kubernetes cluster consisting of VMs. My problem is, that the coredns pods are always go in CrashLoopBackOff state, and after a while they go back to Running as nothing happened.. One solution that I found and could not try yet,…
B.G.
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1 answer

Resolving external domains from within pods does not work

What happened Resolving an external domain from within a pod fails with SERVFAIL message. In the logs, i/o timeout error is mentioned. What I expected to happen External domains should be successfully resolved from the pods. How to reproduce…
Nikola Malešević
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1 answer

Kubernetes DNS lookup issue and "invalid" in the /etc/resolv.conf file

I have deployed a Kubernetes cluster composed of a master and two workers using kubeadm and the Flannel network driver (So I passed the --pod-network-cidr=10.244.0.0/16 flag to kubeadm init). Those nodes are communicating together using a VPN so…
ZedTuX
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1 answer

Debugging DNS resolutions in kubernetes

I have initialized kubernetes v1.13.1 cluster on Ubuntu 16.04 using below command: sudo kubeadm init --token-ttl=0 --apiserver-advertise-address=192.168.88.142 and installed weave using: kubectl apply -f…
S Andrew
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5 answers

Kubernetes CoreDNS in CrashLoopBackOff

I understand that this question is asked dozen times, but nothing has helped me through internet searching. My set up: CentOS Linux release 7.5.1804 (Core) Docker Version: 18.06.1-ce Kubernetes: v1.12.3 Installed by official guide and this…
Hakon89
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1 answer

DNS error with MySQL integration with kubernetes cluster

What happened: I am trying to create a service endpoint using the externalName spec to allow my microservices running inside the pods to access a local MySQL server on my local host. This is the relevant section for the yaml file: apiVersion: v1…
Juin
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Kubernetes pods unable to resolve host :

I have setup an Azure Kubernetes Cluster using kubenet plugin. All pods and services are running. Also, when I do a kubectl get pods -n kube-system all pods are running. The issue I have is, the pods are unable to connect to other pods via…
jack
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3 answers

Kubernetes coredns readiness probe failed

I have setup a Kubernetes cluster with one master (kube-master) and 2 slaves (kube-node-01 and kube-node-02) All was running fine ... now after debian stretch -> buster upgrade my coredns pods are failing with CrashLoopBackOff for some reason. I did…
Pascal
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