EKS - CoreDNS - Debug - Restart

How to Debug or Restart CoreDNS in Kubernetes If your applications are having connectivity issues after powering on hosts in your Kubernetes cluster, particularly with services unable to connect to databases or other internal services, you may need to restart the CoreDNS deployment. What is CoreDNS? CoreDNS is a DNS server that runs inside your Kubernetes cluster. It provides name resolution for all the services and pods in the cluster. It acts as the Kubernetes DNS provider , replacing the older kube-dns . CoreDNS runs as a Deployment in the kube-system namespace Use the below command to see the current status and logs for CoreDNS. Using kubectl Check the CoreDNS Deployment Status kubectl get deployment coredns -n kube-system Check the CoreDNS Pods kubectl get pods -n kube-system -l k8s-app=kube-dns Check Logs for CoreDNS kubectl logs -n kube-system -l k8s-app=kube-dns Execute the following command to restart the CoreDNS deployment kubectl rollout restart deployment coredns -n kube-system Using Lens UI Alternatively, if you're using the Lens UI: Navigate to the kube-system namespace Find the CoreDNS pods Delete the CoreDNS pods to trigger a restart Note: After restarting CoreDNS, your applications should be able to resolve and connect to internal services properly again.