skydns: failure to forward request "read udp 172.25.52.4:49993->10.10.72.188:53: i/o timeout"

[janzhang]

Our services will appear several times a day skydns request nameserver service timeout, but we're in the DNS server does not appear any abnormalities.

This problem is not on my side skydns configuration?

apiVersion: v1
kind: ReplicationController
metadata:
name: skydns
labels:
app: skydns
version: v9
spec:
replicas: 3
selector:
app: skydns
version: v9
template:
metadata:
labels:
app: skydns
version: v9
spec:
containers:
- name: skydns
image: pub.domeos.org/domeos/skydns:1.5
command:
- "/skydns"
args:
- "--machines=http://10.16.39.121:4012,http://10.16.39.122:4012,http://10.16.39.123:4012"
- "--domain=focus.com"
- "--addr=0.0.0.0:53"
- "--nameservers=10.10.72.188:53"
ports:
- containerPort: 53
name: dns-udp
protocol: UDP
- containerPort: 53
name: dns-tcp

protocol: TCP