前面的博文中介绍了k8s集群的部署，这里主要介绍部署kube-dns和Dashboard。
环境说明
Node-1(Master): 10.0.0.1
Node-2: 10.0.0.2
Node-3: 10.0.0.3
集群使用二进制安装，并已部署flannel网络插件。
kube-DNS
在进行如下的操作时，你必须已经部署好了K8S的集群，如果你还没有这样的集群，请参考我之前的博文。
1、在官网找到对应的yaml文件，地址为：https://github.com/kubernetes/kubernetes/tree/2f011d01fa542633184cde4bba97d006b8d06309/cluster/addons/dns/coredns , 我们修改相关配置，主要是ClusterIP的配置信息和镜像路径：
apiVersion: v1
kind: ServiceAccount
metadata:
name: coredns
namespace: kube-system
labels:
kubernetes.io/cluster-service: "true"
addonmanager.kubernetes.io/mode: Reconcile
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
labels:
kubernetes.io/bootstrapping: rbac-defaults
addonmanager.kubernetes.io/mode: Reconcile
name: system:coredns
rules:
- apiGroups:
- ""
resources:
- endpoints
- services
- pods
- namespaces
verbs:
- list
- watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
annotations:
rbac.authorization.kubernetes.io/autoupdate: "true"
labels:
kubernetes.io/bootstrapping: rbac-defaults
addonmanager.kubernetes.io/mode: EnsureExists
name: system:coredns
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:coredns
subjects:
- kind: ServiceAccount
name: coredns
namespace: kube-system
---
apiVersion: v1
kind: ConfigMap
metadata:
name: coredns
namespace: kube-system
labels:
addonmanager.kubernetes.io/mode: EnsureExists
data:
Corefile: |
.:53 {
errors
health
kubernetes cluster.local. in-addr.arpa ip6.arpa {
pods insecure
upstream
fallthrough in-addr.arpa ip6.arpa
}
prometheus :9153
proxy . /etc/resolv.conf
cache 30
}
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: coredns
namespace: kube-system
labels:
k8s-app: coredns
kubernetes.io/cluster-service: "true"
addonmanager.kubernetes.io/mode: Reconcile
kubernetes.io/name: "CoreDNS"
spec:
replicas: 2
strategy:
type: RollingUpdate
rollingUpdate:
maxUnavailable: 1
selector:
matchLabels:
k8s-app: coredns
template:
metadata:
labels:
k8s-app: coredns
spec:
serviceAccountName: coredns
tolerations:
- key: node-role.kubernetes.io/master
effect: NoSchedule
- key: "CriticalAddonsOnly"
operator: "Exists"
containers:
- name: coredns
image: coredns/coredns:1.0.6
imagePullPolicy: IfNotPresent
resources:
limits:
memory: 170Mi
requests:
cpu: 100m
memory: 70Mi
args: [ "-conf", "/etc/coredns/Corefile" ]
volumeMounts:
- name: config-volume
mountPath: /etc/coredns
ports:
- containerPort: 53
name: dns
protocol: UDP
- containerPort: 53
name: dns-tcp
protocol: TCP
livenessProbe:
httpGet:
path: /health
port: 8080
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
dnsPolicy: Default
volumes:
- name: config-volume
configMap:
name: coredns
items:
- key: Corefile
path: Corefile
---
apiVersion: v1
kind: Service
metadata:
name: coredns
namespace: kube-system
labels:
k8s-app: coredns
kubernetes.io/cluster-service: "true"
addonmanager.kubernetes.io/mode: Reconcile
kubernetes.io/name: "CoreDNS"
spec:
selector:
k8s-app: coredns
clusterIP: 10.222.0.100
ports:
- name: dns
port: 53
protocol: UDP
- name: dns-tcp
port: 53
protocol: TCP
执行此yaml文件：
kubectl create -f coredns.yaml查看文件状态：
[root@node-1 ~]# kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
coredns-77c989547b-2rg9h 1/1 Running 0 1h
coredns-77c989547b-cbj5h 1/1 Running 0 1h
[root@node-1 ~]# kubectl get rs -n kube-system
NAME DESIRED CURRENT READY AGE
coredns-77c989547b 2 2 2 1h
[root@node-1 ~]# kubectl get svc -n kube-system
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
coredns ClusterIP 10.222.0.100 <none> 53/UDP,53/TCP 1h
配置Dashboard
下载官方的yaml文件，执行如下命令：
kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml只有安装了dns服务才能使用dashboard，否则将无法找到dashboard的service。
当dashboard服务启动后查看服务是否正常：
[root@node-1 ~]# kubectl get pod -n kube-system
NAME READY STATUS RESTARTS AGE
coredns-77c989547b-2rg9h 1/1 Running 0 2h
coredns-77c989547b-cbj5h 1/1 Running 0 2h
kubernetes-dashboard-7d5dcdb6d9-h66fs 1/1 Running 0 1h
[root@node-1 ~]# kubectl get svc -n kube-system
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
coredns ClusterIP 10.222.0.100 <none> 53/UDP,53/TCP 2h
kubernetes-dashboard ClusterIP 10.222.251.161 <none> 443/TCP 1h
使用代理，执行如下命令：
[root@node-1 ~]# kubectl proxy --port=8001 --address='10.0.0.1' --accept-hosts='^.*'
Starting to serve on 10.0.0.1:8001
在浏览器中输入地址：http://10.0.0.1:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/
如果不出意外，会看到如下界面：
按照此提示创建用户 https://github.com/kubernetes/dashboard/wiki/Creating-sample-user
之后获取token,使用token登录：
kubectl describe secret -n kube-system `kubectl get secret -n kube-system |grep admin-user |awk '{print $1}'`也可以通过master节点登录，访问此地址：https://10.0.0.1:6443/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/
登录成功后显示主界面：
