SpringCloud 微服务迁移到 Kubernetes 容器化完整流程

野性酷女 2023-10-15 22:02 47阅读 0赞

### 熟悉Spring Cloud微服务项目 ###

微服务架构图

![图片][b8c5a616199f0d18d9ef0f54ace07154.png]

### 源代码编译构建 ###

拉取仓库代码

git clone http://192.168.0.126/saas-wms/linkinsense-wms-public.git

![图片][fad81dcb6a56ae7b4f9576667700004c.png]

编译代码

mvn clean package -Dmaven.test.skip=true -Pdev

![图片][50b17a11430018bfc7dbd35f238b8e9d.png]

这儿构建时间久是因为第一次构建，需要下载maven依赖，之后构建就会很快了。

### 构建项目镜像并推送到镜像仓库 ###

*  基础镜像：centos,ubuntu
 *  中间件镜像：jdk,nginx
 *  项目镜像：基础镜像+中间件镜像+项目代码

制作镜像

> ❝
> 
> https://blog.csdn.net/qq\_40722827/article/details/126337904
> 
> ❞

编写gateway服务的DockerFile，制作镜像

vi Dockerfile

FROM openjdk:8-jre
    
    RUN ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
    RUN echo 'Asia/Shanghai' > /etc/timezone
    
    WORKDIR /wms-center/wms-gateway
    
    ADD ./target/wms-gateway-1.0.0.jar ./
    
    EXPOSE 8901
    
    CMD java -jar wms-gateway-1.0.0.jar

编写完成的DockerFile放置的文件位置

![图片][32612b6100267bd9adaaabddb0b14362.png]

通过DockerFile构建镜像

docker build -t wms-gateway:v1 -f wms-gateway/Dockerfile ./wms-gateway/

![图片][b9abcd39d375cddf359a58ef4992d480.png]

查看构建好的镜像

docker images

![图片][7a6b43bc548f3c08b1759d6b2a76bd04.png]

将镜像推送到harbor仓库

之前本地部署的镜像仓库Harbor: http://192.168.0.127:8084/，如果没有可拿docker-hub注册一个账号。

登录仓库

docker login 192.168.0.127:8084

![图片][95e29ec3fce241cba0b9598bb41a3c74.png]

推送镜像到镜像仓库需要满足镜像仓库的镜像名称，因此需要给构建好的镜像打个tag。

给构建的镜像打tag

docker tag wms-gateway:v1  192.168.0.127:8084/onlee/gateway:v1

推送镜像仓库

docker push 192.168.0.127:8084/onlee/gateway:v1

![图片][a0852215481f64e83af6770d504478a7.png]

![图片][1a6c62289d3b5ca041af65368f3ac548.png]

其他模块构建和推送参考gateway模块

### K8s服务编排 ###

制作gateway的k8s yaml文件（gateway.yaml）

---
    apiVersion: apps/v1
    kind: Deployment 
    metadata:
      name: gateway
      namespace: wms-dev
    spec:
      replicas: 1
      selector:
        matchLabels:
          project: wms-dev
          app: gateway
      template:
        metadata:
          labels:
            project: wms-dev
            app: gateway
        spec:
          imagePullSecrets:
          - name: registry-harbor
          containers:
          - name: gateway
            image: 192.168.0.127:8084/onlee/gateway:v1
            imagePullPolicy: Always
            ports:
              - protocol: TCP
                containerPort: 8901
            env:
              - name: JAVA_OPTS
                value: "-Xmx1g"
            resources:
              requests:
                cpu: 0.5
                memory: 256Mi
              limits:
                cpu: 1
                memory: 1Gi
            readinessProbe:
              tcpSocket:
                port: 8901
              initialDelaySeconds: 60
              periodSeconds: 10
            livenessProbe:
              tcpSocket:
                port: 8901
              initialDelaySeconds: 60
              periodSeconds: 10

其他模块编写k8s yaml文件参考gateway模块

### 部署基础环境 ###

这一步暂时省略，后续补充…

*  在K8s中部署Nacos集群（注册和配置中心）
 *  在k8s中部署Seata分布式事务
 *  在linux部署mysql,redis,rabbitmq,minio,xxl-job

### 部署微服务程序 ###

准备namespace

kubectl create namespace wms-dev

![图片][7858871c330907e71ea9b79d93495225.png]

部署服务

kubectl apply -f gateway.yaml

![图片][30d0aedd501a2d0843a223ec0f64cd50.png]

其他模块部署服务参考gateway模块

### 部署微服务前端 ###

编写DockerFile文件

FROM nginx
    
    COPY dist /usr/share/nginx/html/
    
    EXPOSE 80

构建镜像

docker build -t wms-web:v1 -f  Dockerfile .

镜像打tag

docker tag  wms-web:v1 192.168.0.127:8084/onlee/wms-web:v1

推送到镜像仓库

docker push  192.168.0.127:8084/onlee/wms-web:v1

服务编排(web.yaml)

apiVersion: apps/v1
    kind: Deployment
    metadata:
      labels:
        app: wms-web
      name: wms-web
      namespace: wms-dev
    spec:
      progressDeadlineSeconds: 600
      replicas: 1
      selector:
        matchLabels:
          app: wms-web
      strategy:
        rollingUpdate:
          maxSurge: 50%
          maxUnavailable: 50%
        type: RollingUpdate
      template:
        metadata:
          labels:
            app: wms-web
        spec:
          imagePullSecrets:
            - name: registry-harbor
          containers:
            - image: 192.168.0.127:8084/onlee/wms-web:v1
              imagePullPolicy: Always
              name: app
              ports:
                - containerPort: 80
                  protocol: TCP
              resources:
                limits:
                  cpu: 300m
                  memory: 600Mi
              terminationMessagePath: /dev/termination-log
              terminationMessagePolicy: File
          dnsPolicy: ClusterFirst
          restartPolicy: Always
          terminationGracePeriodSeconds: 30

部署服务

kubectl apply -f web.yaml

### 微服务对外发布 ###

通过整个微服务架构可知，只有gateway和前端需要暴露服务。

![图片][3ee20f022b98e2b0b07d03e5fe7db607.png]

#### NorePort方式暴露 ####

gateway对外暴露

gateway-nortport.yaml

---
    apiVersion: v1
    kind: Service
    metadata:
      name: gateway
      namespace: wms-dev
    spec:
      ports:
      - port: 8901
        name: gateway
        protocol: TCP
        targetPort: 8901
        nodePort: 32074
      selector:
        project: wms
        app: gateway
      type: NodePort

前端对外暴露

web-noreport.yaml

---
    apiVersion: v1
    kind: Service
    metadata:
      labels:
        app: wms-web
      name: wms-web
      namespace: wms-dev
    spec:
      ports:
        - name: http
          port: 80
          protocol: TCP
          targetPort: 80
          nodePort: 32248
      selector:
        app: wms-web
      sessionAffinity: None
      type: NodePort

#### Ingress方式暴露 ####

> ❝
> 
> https://blog.csdn.net/qq\_40722827/article/details/127929141
> 
> ❞

![图片][3fa9847f16d279d03f7b68887eb01158.png]

gateway对外暴露

---
    apiVersion: networking.k8s.io/v1
    kind: Ingress
    metadata:
      name: gateway 
      namespace: wms-dev
      annotations:
        kubernetes.io/ingress.class: "nginx"
        nginx.ingress.kubernetes.io/backend-protocol: "HTTP"
    spec:
      rules:
        - host: gateway.wms.com 
          http:
            paths:
            - path: /
              pathType: Prefix
              backend:
                service: 
                  name: gateway
                  port: 
                    number: 8901
    ---
    apiVersion: v1
    kind: Service
    metadata:
      name: gateway
      namespace: wms-dev
    spec:
      ports:
      - port: 8901 
        name: gateway
      selector:
        project: wms-dev
        app: gateway

前端对外暴露

---
    apiVersion: networking.k8s.io/v1
    kind: Ingress
    metadata:
      name: wms-web
      namespace: wms-dev
      annotations:
        kubernetes.io/ingress.class: "nginx"
        nginx.ingress.kubernetes.io/backend-protocol: "HTTP"
    spec:
      rules:
        - host: dev.wms.com 
          http:
            paths:
            - path: /
              pathType: Prefix
              backend:
                service: 
                  name: wms-web
                  port: 
                    number: 80
    ---
    apiVersion: v1
    kind: Service
    metadata:
      labels:
        app: wms-web
      name: wms-web
      namespace: wms-dev
    spec:
      ports:
        - name: http
          protocol: TCP
          port: 80
          targetPort: 80
      type: ClusterIP
      selector:
        app: wms-web
      sessionAffinity: None

至此，所有微服务已经迁移到Kubernetes容器上了。

![图片][080a6d311130599f4ae2c0e1cb9a7931.png]

把我们上面手动做的这些，通过Jenkins等组件搭建成一个自动化部署的过程，就涉及到DevOps相关的知识了。接下来就会编写这一块的内容。

以上内容还有一些不够完善的地方，后续也会不断完善的。

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