Using trace dns
The trace dns gadget prints information about DNS requests performed by the different pods.
Create a demo namespace:
$ kubectl create ns demo
namespace/demo created
Start the dns gadget:
$ kubectl gadget trace dns -n demo
NODE NAMESPACE POD TYPE QTYPE NAME
Run a pod on a different terminal and perform some DNS requests:
$ kubectl -n demo run mypod -it --image=wbitt/network-multitool -- /bin/sh
# nslookup www.microsoft.com
# nslookup www.google.com
# nslookup www.amazon.com
The requests will be logged by the DNS gadget:
NODE NAMESPACE POD TYPE QTYPE NAME
minikube demo mypod OUTGOING A www.microsoft.com.demo.svc.cluster.local.
minikube demo mypod OUTGOING A www.microsoft.com.svc.cluster.local.
minikube demo mypod OUTGOING A www.microsoft.com.cluster.local.
minikube demo mypod OUTGOING A www.microsoft.com.
minikube demo mypod OUTGOING AAAA e13678.dscb.akamaiedge.net.
minikube demo mypod OUTGOING A www.google.com.demo.svc.cluster.local.
minikube demo mypod OUTGOING A www.google.com.svc.cluster.local.
minikube demo mypod OUTGOING A www.google.com.cluster.local.
minikube demo mypod OUTGOING A www.google.com.
minikube demo mypod OUTGOING AAAA www.google.com.
minikube demo mypod OUTGOING A www.amazon.com.demo.svc.cluster.local.
minikube demo mypod OUTGOING A www.amazon.com.svc.cluster.local.
minikube demo mypod OUTGOING A www.amazon.com.cluster.local.
minikube demo mypod OUTGOING A www.amazon.com.
minikube demo mypod OUTGOING AAAA e15316.a.akamaiedge.net.
Delete the demo test namespace:
$ kubectl delete ns demo
namespace "demo" deleted