functions/Networking/TestDNS.ps1
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<#
.SYNOPSIS TestDNS .DESCRIPTION TestDNS .INPUTS TestDNS - The name of TestDNS .OUTPUTS None .EXAMPLE TestDNS .EXAMPLE TestDNS #> function TestDNS() { [CmdletBinding()] param ( [Parameter(Mandatory = $true)] [ValidateNotNullOrEmpty()] [string] $baseUrl ) Write-Verbose 'TestDNS: Starting' WriteToConsole "To resolve DNS issues: https://kubernetes.io/docs/tasks/administer-cluster/dns-custom-nameservers/#debugging-dns-resolution" WriteToConsole "Checking if DNS pods are running" kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o wide WriteToConsole "Details about DNS pods" kubectl describe pods --namespace=kube-system -l k8s-app=kube-dns WriteToConsole "Details about flannel pods" kubectl logs --namespace kube-system -l app=flannel WriteToConsole "Checking if DNS service is running" kubectl get svc --namespace=kube-system WriteToConsole "Checking if DNS endpoints are exposed " kubectl get ep kube-dns --namespace=kube-system WriteToConsole "Checking logs for DNS service" # kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name) kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name) -c kubedns kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name) -c dnsmasq kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name) -c sidecar WriteToConsole "Creating a busybox pod to test DNS" Do { WriteToConsole "Waiting for busybox to terminate" WriteToConsole "." Start-Sleep 5 } while ($(kubectl get pods busybox -n default -o jsonpath='{.status.phase}' --ignore-not-found=true)) kubectl create -f $baseUrl/kubernetes/test/busybox.yaml Do { WriteToConsole "." Start-Sleep 5 } while ("$(kubectl get pods busybox -n default -o jsonpath='{.status.phase}')" -ne "Running") WriteToConsole " resolve.conf " kubectl exec busybox cat /etc/resolv.conf WriteToConsole "testing if we can access internal (pod) network" kubectl exec busybox nslookup kubernetes.default WriteToConsole "testing if we can access external network" kubectl exec busybox wget www.google.com kubectl delete -f $baseUrl/kubernetes/test/busybox.yaml WriteToConsole "firewall logs" sudo systemctl status firewalld -l Write-Verbose 'TestDNS: Done' } Export-ModuleMember -Function 'TestDNS' |