环境：
Kubernetes 版本（使用 kubectl 版本）：v1.7.0
云提供商或硬件配置**：
操作系统（例如来自 /etc/os-release）：CentOS 7
内核（例如 uname -a）：Linux k8s-master 3.10.0-514.6 .2.el7.x86_64
安装工具：Kubeadm
其他： docker
版本：Docker 版本 1.12.6，
我的 RPM 版本： docker-
1.12.6-16.el7.centos.x86_64.rpm
kubectl-1.7.0-0.x86_64。 rpm
kubernetes-cni-0.5.1-0.x86_64.rpm
kubeadm-1.7.0-0.x86_64.rpm
kubelet-1.7.0-0.x86_64.rpm
这个命令来自官方文档，但似乎我的集群没有 healthz 容器，我错过了什么吗？
[root@k8s-master ~]# kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name) -c healthz
Error from server (BadRequest): container healthz is not valid for pod kube-dns-2425271678-cqm2n
[root@k8s-master ~]# kubectl get pods --all-namespaces -o wide
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE
default busybox 1/1 Running 1 1h 172.16.2.7 k8s-node2
kube-system etcd-k8s-master 1/1 Running 0 21h 10.132.41.234 k8s-master
kube-system heapster-2994581613-7ppn7 1/1 Running 0 20h 172.16.2.6 k8s-node2
kube-system kube-apiserver-k8s-master 1/1 Running 0 21h 10.132.41.234 k8s-master
kube-system kube-controller-manager-k8s-master 1/1 Running 0 21h 10.132.41.234 k8s-master
kube-system kube-dns-2425271678-cqm2n 3/3 Running 0 21h 172.16.0.2 k8s-master
kube-system kube-flannel-ds-18dr4 2/2 Running 0 20h 10.132.41.234 k8s-master
kube-system kube-flannel-ds-vpkpb 2/2 Running 0 20h 10.165.97.219 k8s-node1
kube-system kube-flannel-ds-x3n24 2/2 Running 0 20h 10.161.233.80 k8s-node2
kube-system kube-proxy-2xhn9 1/1 Running 0 21h 10.132.41.234 k8s-master
kube-system kube-proxy-7hmmx 1/1 Running 0 20h 10.165.97.219 k8s-node1
kube-system kube-proxy-h1gmc 1/1 Running 0 20h 10.161.233.80 k8s-node2
kube-system kube-scheduler-k8s-master 1/1 Running 0 21h 10.132.41.234 k8s-master
kube-system kubernetes-dashboard-2209332821-038fw 1/1 Running 0 20h 172.16.1.2 k8s-node1
kube-system monitoring-grafana-1850655027-vwzcw 1/1 Running 0 20h 172.16.2.5 k8s-node2
kube-system monitoring-influxdb-1870447071-vx3md 1/1 Running 0 20h 172.16.1.3 k8s-node1
[root@k8s-master ~]# docker ps |grep dns
d3668f0904fb 3e08c89ee425 "/kube-dns --domain=c" 20 hours ago Up 20 hours k8s_kubedns_kube-dns-2425271678-cqm2n_kube-system_42298b87-7032-11e7-a792-00163e024627_0
5ddf2d4f6adb db8241b72199 "/sidecar --v=2 --log" 20 hours ago Up 20 hours k8s_sidecar_kube-dns-2425271678-cqm2n_kube-system_42298b87-7032-11e7-a792-00163e024627_0
101119787b35 1813641c1a74 "/dnsmasq-nanny -v=2 " 20 hours ago Up 20 hours k8s_dnsmasq_kube-dns-2425271678-cqm2n_kube-system_42298b87-7032-11e7-a792-00163e024627_0
1d80ad4754a3 gcr.io/google_containers/pause-amd64:3.0 "/pause" 20 hours ago Up 20 hours k8s_POD_kube-dns-2425271678-cqm2n_kube-system_42298b87-7032-11e7-a792-00163e024627_0