k8s1.13.0二进制部署-Dashboard和coredns（五）

部署UI

下载yaml文件
https://github.com/kubernetes/kubernetes

[root@k8s-master1 ~]# git clone https://github.com/kubernetes/kubernetes.git
[root@k8s-master1 ~]# cd kubernetes/cluster/addons/dashboard/
[root@k8s-master1 dashboard]# ll
total 32
-rw-r--r-- 1 root root  264 Dec 18 10:14 dashboard-configmap.yaml
-rw-r--r-- 1 root root 1822 Dec 18 10:14 dashboard-controller.yaml
-rw-r--r-- 1 root root 1353 Dec 18 10:14 dashboard-rbac.yaml
-rw-r--r-- 1 root root  551 Dec 18 10:14 dashboard-secret.yaml
-rw-r--r-- 1 root root  322 Dec 18 10:14 dashboard-service.yaml

修改文件内容

默认kubernetes-dashboard是官网默认镜像地址，需要FQ，咱们这里用阿里云的镜像就可以。
.....
    spec:
      priorityClassName: system-cluster-critical
      containers:
      - name: kubernetes-dashboard
        image: registry.cn-hangzhou.aliyuncs.com/google_containers/kubernetes-dashboard-amd64:v1.10.1
....
修改svc的类型
....
spec:
  type: NodePort
  selector:
    k8s-app: kubernetes-dashboard
  ports:
  - port: 443
    targetPort: 8443
    nodePort: 30001

基于yaml创建

kubectl create -f dashboard-rbac.yaml
kubectl create -f dashboard-secret.yaml
kubectl create -f dashboard-configmap.yaml
kubectl create -f dashboard-controller.yaml
kubectl create -f dashboard-service.yaml

查看

[root@localhost dashboard]# kubectl get pod,svc,deploy -n kube-system -o wide
NAME                                        READY   STATUS    RESTARTS   AGE    IP            NODE            NOMINATED NODE   READINESS GATES
pod/kubernetes-dashboard-7d5f7c58f5-6ggrv   1/1     Running   0          3m2s   172.17.50.2   192.168.0.221   <none>           <none>

NAME                           TYPE       CLUSTER-IP   EXTERNAL-IP   PORT(S)         AGE   SELECTOR
service/kubernetes-dashboard   NodePort   10.0.0.84    <none>        443:30001/TCP   88s   k8s-app=kubernetes-dashboard

NAME                                         READY   UP-TO-DATE   AVAILABLE   AGE    CONTAINERS             IMAGES                                                                                   SELECTOR
deployment.extensions/kubernetes-dashboard   1/1     1            1           3m2s   kubernetes-dashboard   registry.cn-hangzhou.aliyuncs.com/google_containers/kubernetes-dashboard-amd64:v1.10.1   k8s-app=kubernetes-dashboard

创建角色绑定

[root@localhost dashboard]# vim k8s-admin.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  name: dashboard-admin
  namespace: kube-system
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: dashboard-admin
subjects:
  - kind: ServiceAccount
    name: dashboard-admin
    namespace: kube-system
roleRef:
  kind: ClusterRole
  name: cluster-admin
  apiGroup: rbac.authorization.k8s.io

[root@localhost dashboard]# kubectl apply -f k8s-admin.yaml 
serviceaccount/dashboard-admin created
clusterrolebinding.rbac.authorization.k8s.io/dashboard-admin create

获取令牌

[root@localhost dashboard]# kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep admin-token | awk '{print $1}')
Name:         dashboard-admin-token-txkkz
Namespace:    kube-system
Labels:       <none>
Annotations:  kubernetes.io/service-account.name: dashboard-admin
              kubernetes.io/service-account.uid: 7dbf9a60-805a-11e9-b018-525400828c1f

Type:  kubernetes.io/service-account-token

Data
====
ca.crt:     1359 bytes
namespace:  11 bytes
token:      eyJhbGciOiJSUzI1NiIsImtpZCI6IiJ9.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.ccan7T6t7bGbvOaOOQKj_NYalEezlPz38CCYo6vuNi-FTYQ11HsRBZPcwJMdcRg0maKc-RR3S5JY9KLzhoZlHWSDjrD2CFoXa-1c8iWKYTxMuGiAwWFw_NhUZchoXIBRlCQTkOTNhVjmtKn82oV6OhyyCsgxNKN_5uWtpEREsNXS5AKMesQei9N7Vr5QdPRh3mDrNKPQstbzTN-EWgjjOXYdkeIsUghvh15uJ9bOXs1p0ket9_wgrPz6rdHhhSyv-JJLhk6h3EpnZnzLk659ejmOMv838MWC1KeTlUM7xnAcQPYYHsa59RBAdUcCczZhGACwn4AXWWxaDWBkyg

浏览器访问

解决谷歌浏览器不能显示

[root@localhost dashboard]# vim dashboard-csr.json
{
    "CN": "Dashboard",
    "hosts": [],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "BeiJing",
            "ST": "BeiJing"
        }
    ]
}

#生成证书
[root@localhost dashboard]# cfssl gencert -ca=/opt/kubernetes/ssl/ca.pem -ca-key=/opt/kubernetes/ssl/ca-key.pem -config=/opt/kubernetes/ssl/ca-config.json -profile=kubernetes dashboard-csr.json | cfssljson -bare dashboard

#删除secret
[root@localhost dashboard]# kubectl delete secret kubernetes-dashboard-certs -n kube-system
secret "kubernetes-dashboard-certs" deleted
[root@localhost dashboard]# kubectl create secret generic kubernetes-dashboard-certs --from-file=./ -n kube-system
secret/kubernetes-dashboard-certs created

#修改yaml文件，指定刚才生成的证书
[root@localhost dashboard]# vim dashboard-controller.yaml
....
        args:
          # PLATFORM-SPECIFIC ARGS HERE
          - --auto-generate-certificates
          - --tls-key-file=dashboard-key.pem
          - --tls-cert-file=dashboard.pem
....

#重新部署
[root@localhost dashboard]# kubectl apply -f dashboard-controller.yaml

 部署coredns

下载yaml文件：https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/dns/coredns

[root@k8s-master1 demo]# cat coredns.yaml 
# Warning: This is a file generated from the base underscore template file: coredns.yaml.base

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
        loop
        reload
        loadbalance
    }
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: coredns
  namespace: kube-system
  labels:
    k8s-app: kube-dns
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
    kubernetes.io/name: "CoreDNS"
spec:
  # replicas: not specified here:
  # 1. In order to make Addon Manager do not reconcile this replicas parameter.
  # 2. Default is 1.
  # 3. Will be tuned in real time if DNS horizontal auto-scaling is turned on.
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 1
  selector:
    matchLabels:
      k8s-app: kube-dns
  template:
    metadata:
      labels:
        k8s-app: kube-dns
      annotations:
        seccomp.security.alpha.kubernetes.io/pod: 'docker/default'
    spec:
      serviceAccountName: coredns
      tolerations:
        - key: node-role.kubernetes.io/master
          effect: NoSchedule
        - key: "CriticalAddonsOnly"
          operator: "Exists"
      containers:
      - name: coredns
        image: coredns/coredns:1.2.6
        imagePullPolicy: IfNotPresent
        resources:
          limits:
            memory: 170Mi
          requests:
            cpu: 100m
            memory: 70Mi
        args: [ "-conf", "/etc/coredns/Corefile" ]
        volumeMounts:
        - name: config-volume
          mountPath: /etc/coredns
          readOnly: true
        ports:
        - containerPort: 53
          name: dns
          protocol: UDP
        - containerPort: 53
          name: dns-tcp
          protocol: TCP
        - containerPort: 9153
          name: metrics
          protocol: TCP
        livenessProbe:
          httpGet:
            path: /health
            port: 8080
            scheme: HTTP
          initialDelaySeconds: 60
          timeoutSeconds: 5
          successThreshold: 1
          failureThreshold: 5
        securityContext:
          allowPrivilegeEscalation: false
          capabilities:
            add:
            - NET_BIND_SERVICE
            drop:
            - all
          readOnlyRootFilesystem: true
      dnsPolicy: Default
      volumes:
        - name: config-volume
          configMap:
            name: coredns
            items:
            - key: Corefile
              path: Corefile
---
apiVersion: v1
kind: Service
metadata:
  name: kube-dns
  namespace: kube-system
  annotations:
    prometheus.io/port: "9153"
    prometheus.io/scrape: "true"
  labels:
    k8s-app: kube-dns
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
    kubernetes.io/name: "CoreDNS"
spec:
  selector:
    k8s-app: kube-dns
  clusterIP: 10.0.0.2 
  ports:
  - name: dns
    port: 53
    protocol: UDP
  - name: dns-tcp
    port: 53
    protocol: TCP

创建pod

[root@k8s-master1 demo]# kubectl apply -f coredns.yaml

测试域名解析

[root@k8s-master1 demo]# kubectl run -it --image=busybox:1.28.4 --rm --restart=Never sh
If you don't see a command prompt, try pressing enter.
/ # nslookup kubernetes
Server:    10.0.0.2
Address 1: 10.0.0.2 kube-dns.kube-system.svc.cluster.local

Name:      kubernetes
Address 1: 10.0.0.1 kubernetes.default.svc.cluster.local