Kubernetes kube-dns fix nslookup error — Got recursion not available from…

Just an unharmed message ,but you can fix it too.

$ k exec -it deployments/debug  -- bash
root@debug-f5bcbd446-zd4gt:/# nslookup echo
;; Got recursion not available from 10.96.0.10
Server:         10.96.0.10
Address:        10.96.0.10#53

Name:   echo.default.svc.cluster.local
Address: 10.96.135.222
;; Got recursion not available from 10.96.0.10

Enable recursio response for nslookup, just update kube-dns/coredns ConfigMap:

header {
    response set ra
    }

example:

nick@nick-iot:~$ k describe cm -n kube-system coredns 
Name:         coredns
Namespace:    kube-system
Labels:       <none>
Annotations:  <none>

Data
====
Corefile:
----
.:53 {
    header {
    response set ra
    }
    errors
    health {
       lameduck 5s
    }
    ready
    kubernetes cluster.local in-addr.arpa ip6.arpa {
       pods insecure
       fallthrough in-addr.arpa ip6.arpa
       ttl 30
    }
    prometheus :9153
    forward . /etc/resolv.conf {
       max_concurrent 1000
    }
    cache 30
    loop
    reload
    loadbalance
}

Result:

$ k exec -it deployments/debug  -- bash
root@debug-f5bcbd446-zd4gt:/# nslookup echo
Server:         10.96.0.10
Address:        10.96.0.10#53

Name:   echo.default.svc.cluster.local
Address: 10.96.135.222

That is all.