十三，部署微服务到K8S

上一篇文章我们构建了微服务的 Docker 镜像，接下来我们将镜像部署到K8S中。

完整代码：

https://github.com/Justin02180218/micro-kit

部署架构

每个微服务启动2个 pod 注册到 consul 上，网关也启动2个 pod 从 consul 上获取微服务的一个 pod 实例来访问接口。

在 ingress 上配置了4个域名转发：

api.library.com：访问 api 网关
consul.library.com：访问 consul ui 页面
zipkin.library.com：访问 zipkin 页面
hystrix.library.com：访问 hystrix dashboard 页面

编写 K8S apply 文件

创建 deploy/k8s 目录，在此目录下编写 k8s apply 文件，如图：

镜像仓库

在编写 k8s apply 文件前，先把我们构建好的 Docker 镜像上传到镜像仓库上。镜像仓库采用Harbor，Harbor是由VMware公司开源的企业级的Docker Registry管理项目，它包括权限管理(RBAC)、LDAP、日志审核、管理界面、自我注册、镜像复制和中文支持等功能。

安装 consul


$ helm repo add hashicorp https://helm.releases.hashicorp.com
$ helm install consul hashicorp/consul

编写 user deployment

创建 k8s-user-deployment.yaml 文件，代码如下：


apiVersion: apps/v1
kind: Deployment
metadata:
  name: user-service
  labels:
    svc: user
    app: service
spec:
  replicas: 2
  selector:
    matchLabels:
      svc: user
      app: service
  template:
    metadata:
      labels:
        svc: user
        app: service
    spec:
      containers:
      - name: user-service
        image: harbor.justin.com/micro-kit/user-service:latest
        imagePullPolicy: Always
        ports:
        - containerPort: 10086
        resources:
          requests:
            memory: 64Mi
            cpu: 250m
          limits:
            memory: 64Mi
            cpu: 250m

编写 book deployment

创建 k8s-book-deployment.yaml 文件，代码如下：


apiVersion: apps/v1
kind: Deployment
metadata:
  name: book-service
  labels:
    svc: book
    app: service
spec:
  replicas: 2
  selector:
    matchLabels:
      svc: book
      app: service
  template:
    metadata:
      labels:
        svc: book
        app: service
    spec:
      containers:
      - name: book-service
        image: harbor.justin.com/micro-kit/book-service:latest
        imagePullPolicy: Always
        ports:
        - containerPort: 10087
        resources:
          requests:
            memory: 64Mi
            cpu: 250m
          limits:
            memory: 64Mi
            cpu: 250m

编写 book rpc deployment

创建 k8s-book-rpc-deployment.yaml 文件，代码如下：


apiVersion: apps/v1
kind: Deployment
metadata:
  name: book-rpc-service
  labels:
    svc: book-rpc
    app: service
spec:
  replicas: 2
  selector:
    matchLabels:
      svc: book-rpc
      app: service
  template:
    metadata:
      labels:
        svc: book-rpc
        app: service
    spec:
      containers:
      - name: book-rpc-service
        image: harbor.justin.com/micro-kit/book-rpc-service:latest
        imagePullPolicy: Always
        ports:
        - containerPort: 10088
        resources:
          requests:
            memory: 64Mi
            cpu: 250m
          limits:
            memory: 64Mi
            cpu: 250m

编写 apigateway service

创建 k8s-apigateway-service.yaml 文件，代码如下：


apiVersion: apps/v1
kind: Deployment
metadata:
  name: library-apigateway
  labels:
    svc: library
    app: apigateway
spec:
  replicas: 2
  selector:
    matchLabels:
      svc: library
      app: apigateway
  template:
    metadata:
      labels:
        svc: library
        app: apigateway
    spec:
      containers:
      - name: library-apigateway
        image: harbor.justin.com/micro-kit/apigateway:latest
        imagePullPolicy: Always
        ports:
        - containerPort: 80
        resources:
          requests:
            memory: 64Mi
            cpu: 250m
          limits:
            memory: 64Mi
            cpu: 250m
---
apiVersion: v1
kind: Service
metadata:
  name: library-apigateway
spec:
  ports:
  - port: 80
  selector:
    svc: library
    app: apigateway

编写 zipkin service

创建 k8s-zipkin-service.yaml 文件，代码如下：


apiVersion: apps/v1
kind: Deployment
metadata:
  name: zipkin-server
spec:
  replicas: 1
  selector:
    matchLabels:
      app: zipkin-server
  template:
    metadata:
      labels:
        app: zipkin-server
    spec:
      containers:
        - name: zipkin-server
          image: openzipkin/zipkin
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 9411
---
apiVersion: v1
kind: Service
metadata:
  name: zipkin-server
spec:
  ports:
  - port: 9411
  selector:
    app: zipkin-server

编写 hystrix dashboard service

创建 k8s-hystrixdashboard-service.yaml 文件，代码如下：


apiVersion: apps/v1
kind: Deployment
metadata:
  name: hystrix-dashboard
spec:
  replicas: 1
  selector:
    matchLabels:
      app: hystrix-dashboard
  template:
    metadata:
      labels:
        app: hystrix-dashboard
    spec:
      containers:
        - name: hystrix-dashboard
          image: mlabouardy/hystrix-dashboard
          imagePullPolicy: IfNotPresent
          ports:
            - containerPort: 9002
---
apiVersion: v1
kind: Service
metadata:
  name: hystrix-dashboard
spec:
  ports:
  - port: 9002
  selector:
    app: hystrix-dashboard

编写 ingress

创建 k8s-ingress.yaml 文件，代码如下：


apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: apigateway-ingress
spec:
  rules:
  - host: api.library.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: library-apigateway
            port: 
              number: 80
  - host: consul.library.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: consul-ui
            port: 
              number: 80
  - host: zipkin.library.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: zipkin-server
            port: 
              number: 9411
  - host: hystrix.library.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: hystrix-dashboard
            port: 
              number: 9002

执行命令

进入项目目录下，执行以下命令部署到 K8S：


kubectl apply -f deploy/k8s/k8s-zipkin-service.yaml
 
kubectl apply -f deploy/k8s/k8s-hystrixdashboard-service.yaml
 
kubectl apply -f deploy/k8s/k8s-book-rpc-deployment.yaml
 
kubectl apply -f deploy/k8s/k8s-book-deployment.yaml
 
kubectl apply -f deploy/k8s/k8s-user-deployment.yaml
 
kubectl apply -f deploy/k8s/k8s-apigateway-service.yaml
 
kubectl apply -f deploy/k8s/k8s-ingress.yaml