Using `trace dns`

The 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
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:

POD                            TYPE      QTYPE     NAME
mypod                          OUTGOING  A         microsoft.com.demo.svc.cluster.local.
mypod                          OUTGOING  A         microsoft.com.svc.cluster.local.
mypod                          OUTGOING  A         microsoft.com.cluster.local.
mypod                          OUTGOING  A         microsoft.com.
mypod                          OUTGOING  AAAA      microsoft.com.
mypod                          OUTGOING  A         www.google.com.demo.svc.cluster.local.
mypod                          OUTGOING  A         www.google.com.svc.cluster.local.
mypod                          OUTGOING  A         www.google.com.cluster.local.
mypod                          OUTGOING  A         www.google.com.
mypod                          OUTGOING  AAAA      www.google.com.
mypod                          OUTGOING  A         www.amazon.com.demo.svc.cluster.local.
mypod                          OUTGOING  A         www.amazon.com.svc.cluster.local.
mypod                          OUTGOING  A         www.amazon.com.cluster.local.
mypod                          OUTGOING  A         www.amazon.com.
mypod                          OUTGOING  AAAA      e15316.a.akamaiedge.net.

Delete the demo test namespace:

$ kubectl delete ns demo
namespace "demo" deleted