![]() To verify that the cluster IP of the kube-dns service is in your pod's /etc/nf, run the following command in the shell inside of the pod: cat /etc/nf To debug, update the image that's used in your manifest file for another image, such as the busybox image (from the Docker website).Ģ. If the application pod doesn't have an available shell binary, then you receive an error similar to the following: OCI runtime exec failed: exec failed: container_linux.go:348: starting container process caused "exec: \"sh\": executable file not found in $PATH": unknown To run commands inside your application pods, run the following command to access a shell inside the running pod: $ kubectl exec -it your-pod-name - sh Connect to the application pod to troubleshoot the DNS issueġ. Note: The kube-proxy gets the endpoints from the control plane and creates the iptables rules on every node. Get the kube-proxy logs: kubectl logs -n kube-system -selector 'k8s-app=kube-proxy' Verify that a security group or network access control list (network ACL) aren't blocking the pods when they communicate with CoreDNS.įor more information, see Why won't my pods connect to other pods in Amazon EKS? Verify that the kube-proxy pod is workingĬheck your logs for timeout errors to the control plane to verify that the kube-proxy pod has access to API servers for your cluster. Note: If the endpoint list is empty, then check the pod status of the CoreDNS pods.ģ. Verify that the DNS endpoints are exposed and pointing to CoreDNS pods: kubectl -n kube-system get endpoints kube-dns Get the ClusterIP of your CoreDNS service: kubectl get service kube-dns -n kube-systemĢ. The following resolution applies to the CoreDNS ClusterIP 10.100.0.10.ġ. These components include, but are not limited to, service endpoint options and iptables rules. ![]() To troubleshoot issues with your CoreDNS pods, verify that all the components of the kube-dns service are working. The CoreDNS pods are abstracted by a service object called kube-dns. If there are issues with the CoreDNS pods, service configuration, or connectivity, then applications can fail DNS resolutions. (maybe once a week).Pods that run inside the Amazon EKS cluster use the CoreDNS service's cluster IP as the default name server for querying internal and external DNS records. I never paid much attention since the error is so sporadic ![]() Seems to be running normally, although I have noticed the occasional NPS EventID 4402 - "There is no domain controller available for domain applereit" error message on various machines. So the question is, what is the impact and how do I resolve this? Everything (don't think that became available until 2008 R2), while the new Server 2012 R2 domain controllers do. I'm only now noticing this error because the Server 2008 domain controller that I installed 5 years ago didn't have BPA Like it says in the picture, I have a feeling that GUID is from an old Server 2003 domain controller that we once had many years ago. ![]() When I look in DNS, under the domains._ container referenced in the BPA error message, I see only one container with a DNS/GUID alias which doesn't match any of the DNS Alias values for our existing domain controllers.īut inside of the _ container, I do see the CNAME entries mapping the DC GUIDs to our 3 domain controllers (see screenshot below): I followed the resolution ("Ensure that "DcByGuid" is not configured in the "DnsAvoidRegisteredRecords" list, either through Group Policy or through the registry.) and verified this is not set. ![]() All domain controllers (but not RODCs) in the domain must register "The "DcByGuid" DNS service (SRV) resource record that advertises this server as an available domain controller in the domain and ensures correct replication is not registered. When running Best Practices Analyzer on new DCs, I get the following error message: I have a Server 2008 domain controller that is about to be decommissioned and two new Server 2012 R2 domain controllers installed and running with all services and FSMO roles transferred to the new domain controllers. ![]()
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