nodelocaldns  pod 中的 /etc/resolv.conf 虽然读取的是 宿主机的/etc/resolv.conf，但是不是实时同步更新的。可能同步更新会有延迟

所以如果  /etc/resolv.conf 文件中的内容

[root@master-01 kubernetes]# kubectl -n kube-system exec node-local-dns-lw7mh -it -- cat /etc/resolv.conf

nameserver 10.10.10.1

nameserver 10.10.10.2

nameserver 114.114.114.114

options single-request-reopen

[root@master-01 kubernetes]# kubectl delete -f nodelocaldns.yaml

serviceaccount "node-local-dns" deleted

service "kube-dns-upstream" deleted

configmap "node-local-dns" deleted

daemonset.apps "node-local-dns" deleted

service "node-local-dns" deleted

[root@master-01 kubernetes]# kubectl apply -f nodelocaldns.yaml

serviceaccount/node-local-dns created

service/kube-dns-upstream created

configmap/node-local-dns created

daemonset.apps/node-local-dns created

service/node-local-dns created

[root@master-01 kubernetes]# kubectl get pods -A -owide|grep loc

kube-system node-local-dns-fn9wt 1/1 Running 0 11s 192.168.1.13 master-03

kube-system node-local-dns-hb4kh 1/1 Running 0 11s 192.168.1.11 master-01

kube-system node-local-dns-pdbsq 1/1 Running 0 11s 192.168.1.14 node-01

kube-system node-local-dns-th4bh 1/1 Running 0 11s 192.168.1.12 master-02

[root@master-01 kubernetes]# kubectl -n kube-system exec node-local-dns-fn9wt -it -- cat /etc/resolv.conf

nameserver 127.0.0.1

nameserver 192.168.3.56

nameserver 10.10.10.2

options single-request-reopen

[root@master-01 kubernetes]# cat /etc/resolv.conf

options timeout:1

options single-request-reopen

nameserver 127.0.0.1

nameserver 192.168.3.56

nameserver 10.10.10.2

 

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