kubernetes 安装配置 kube-ui

接上文：在centos7上安装和配置Kubernetes

下载kube-ui镜像并导入

谷歌的镜像地址被墙了，无法pull拉取镜像，只能手动下载。
在每个minion上导入镜像：

docker load  kube-ui_v3.tar

创建kube-system namespace

创建kube-system.json，内容如下：

# vim kube-system.json

{
  "kind": "Namespace",
  "apiVersion": "v1",
  "metadata": {
    "name": "kube-system"
  }
}

运行以下命令创建namespace

# kubectl create -f kube-system.json
# kubectl get namespace
NAME          LABELS    STATUS
default        none     Active
kube-system    none     Active

创建rc

1. 创建kube-ui-rc.yaml 文件，并写入一下内容

# vim kube-ui-rc.yaml

apiVersion: v1
kind: ReplicationController
metadata:
  name: kube-ui-v3
  namespace: kube-system
  labels:
    k8s-app: kube-ui
    version: v3
    kubernetes.io/cluster-service: "true"
spec:
  replicas: 3
  selector:
    k8s-app: kube-ui
    version: v3
  template:
    metadata:
      labels:
        k8s-app: kube-ui
        version: v3
        kubernetes.io/cluster-service: "true"
    spec:
      containers:
      - name: kube-ui
        image: gcr.io/google_containers/kube-ui:v3
        resources:
          limits:
            cpu: 100m
            memory: 50Mi
        ports:
        - containerPort: 8080
        livenessProbe:
          httpGet:
            path: /
            port: 8080
          initialDelaySeconds: 30
          timeoutSeconds: 5

2. 运行一下命令创建rc,并查看

# kubectl create -f kube-ui-rc.yaml

#kubectl get rc --all-namespaces
NAMESPACE     CONTROLLER   CONTAINER(S)   IMAGE(S)                              SELECTOR                     REPLICAS
kube-system   kube-ui-v3   kube-ui        gcr.io/google_containers/kube-ui:v3   k8s-app=kube-ui,version=v3   3

创建service

1. 创建 kube-ui-svc.yaml 文件，并写入以下内容

# vim kube-ui-svc.yaml

apiVersion: v1
kind: Service
metadata:
  name: kube-ui
  namespace: kube-system
  labels:
    k8s-app: kube-ui
    kubernetes.io/cluster-service: "true"
    kubernetes.io/name: "KubeUI"
spec:
  selector:
    k8s-app: kube-ui
  ports:
  - port: 80
    targetPort: 8080

2. 运行以下命令创建service，并查看service 和 pods

# kubectl create -f kube-ui-svc.yaml
# kubectl get rc,pods --all-namespaces
NAMESPACE     CONTROLLER   CONTAINER(S)   IMAGE(S)                              SELECTOR                     REPLICAS
kube-system   kube-ui-v3   kube-ui        gcr.io/google_containers/kube-ui:v3   k8s-app=kube-ui,version=v3   3
NAMESPACE     NAME               READY     STATUS    RESTARTS   AGE
kube-system   kube-ui-v3-0zyjp   1/1       Running   0          21h
kube-system   kube-ui-v3-6s1d0   1/1       Running   0          21h
kube-system   kube-ui-v3-i0uqs   1/1       Running   0          21h

可以看到kube-ui服务已经成功创建，运行3个副本

master配置flannel网络，与minion连通

1. master安装flannel，并启动

# yum install flannel -y
# systemctl enable flanneld
# systemctl start flanneld

2. 访问kube-ui

访问 http://master_ip:8080/ui/ 会自动跳转 http://kube-ui:8080/api/v1/proxy/namespaces/kube-system/services/kube-ui/#/dashboard/ 即可访问kube-ui的dashboard 页面，如下图所示：

可以查看minion的系统信息，pods，RC，services等信息