but takes sometime to response on ping or nslookup

seems canal cni having issue and i am able to ping 8.8.8.8 every time and its working fine but issue with name resolution only sometime IP which is in resolv.conf 10.43.0.10 this ip sometime listen on 53 port and sometime not / # cat /etc/resolv.conf search default.svc.cluster.local svc.cluster.local cluster.local nameserver 10.43.0.10 options ndots:5 / # nz -zv 10.43.0.10 53 /bin/sh: nz: not found / # nc -zv 10.43.0.10 53 10.43.0.10 (10.43.0.10:53) open / # nc -zv 10.43.0.10 53 10.43.0.10 (10.43.0.10:53) open / # nc -zv 10.43.0.10 53 10.43.0.10 (10.43.0.10:53) open / # nc -zv 10.43.0.10 53 ^[[A ^[[A ^[[A

root@rke-master1:~# cat >z #!/bin/bash echo "=> Start network overlay test" kubectl get pods -l name=overlaytest -o jsonpath='{range .items[*]}{@.metadata.name}{" "}{@.spec.nodeName}{"\n"}{end}' | while read spod shost do kubectl get pods -l name=overlaytest -o jsonpath='{range .items[*]}{@.status.podIP}{" "}{@.spec.nodeName}{"\n"}{end}' | while read tip thost do kubectl --request-timeout='10s' exec $spod -c overlaytest -- /bin/sh -c "ping -c2 $tip > /dev/null 2>&1" RC=$? if [ $RC -ne 0 ] then echo FAIL: $spod on $shost cannot reach pod IP $tip on $thost else echo $shost can reach $thost fi done done echo "=> End network overlay test" root@rke-master1:~# bash z => Start network overlay test rke-master1 can reach rke-master1 rke-master1 can reach rke-worker1 rke-worker1 can reach rke-master1 rke-worker1 can reach rke-worker1 => End network overlay test root@rke-master1:~#

it seems fine here