k8s中nginx+tomcat实现动静分离

Posted 2022-04-22 小怪獣55

1.在k8s环境运行tomcat

镜像构建参考:​​https://blog.51cto.com/taowenwu/5235431​​

yum语法基础参考:​​https://blog.51cto.com/taowenwu/5235191​​

1.1.创建业务namespace

cat linux36.yaml
------------------------------------
apiVersion: v1    #API版本
kind: Namespace   #类型为namespac
metadata:         #定义元数据
  name: linux36   #namespace名称
------------------------------------

root@k8s-master:~/images/k8s-tomcat# kubectl apply -f linux36.yaml 
namespace/linux36 created

root@k8s-master:~/images/k8s-tomcat# kubectl get namespaces
NAME          STATUS   AGE
default       Active   43h
kube-public   Active   43h
kube-system   Active   43h
linux36       Active   47s

1.2.nfs

apt install nfs-kernel-server
systemctl status nfs-server
/etc/init.d/nfs-kernel-server status

#共享目录
root@k8s-harbor:/data/k8sdata/linux36# pwd
/data/k8sdata/linux36
root@k8s-harbor:/data/k8sdata/linux36# ls
images  static

vim /etc/exports 
---------------------------------------------
/data/k8sdata/linux36  *(rw,no_root_squash)
---------------------------------------------

showmount -e 192.168.47.47
exportfs -arv

1.3.创建tomcat业务pod

kind: Deployment
apiVersion: extensions/v1beta1
metadata:
  labels:
    app: linux36-tomcat-app1-deployment-label
  name: linux36-tomcat-app1-deployment
  namespace: linux36
spec:
  replicas: 1
  selector:
    matchLabels:
      app: linux36-tomcat-app1-selector
  template:
    metadata:
      labels:
        app: linux36-tomcat-app1-selector
    spec:
      containers:
      - name: linux36-tomcat-app1-container
        image: harbor.gesila.com/k8s/tomcat-app1:v1
        #command: ["/apps/tomcat/bin/run_tomcat.sh"]
        #imagePullPolicy: IfNotPresent
        imagePullPolicy: Always
        ports:
        - containerPort: 8080
          protocol: TCP
          name: http
        env:
        - name: "password"
          value: "123456"
        - name: "age"
          value: "18"
        resources:
          limits:
            cpu: 2
            memory: "2048Mi"
          requests:
            cpu: 500m
            memory: "1024Mi"
        volumeMounts:
        - name: linux36-images
          mountPath: /data/tomcat/webapps/myapp/images
          readOnly: false
        - name: linux36-static
          mountPath: /data/tomcat/webapps/myapp/static
          readOnly: false
      volumes:
      - name: linux36-images
        nfs:
          server: 192.168.47.47
          path: /data/k8sdata/linux36/images
      - name: linux36-static
        nfs:
          server: 192.168.47.47
          path: /data/k8sdata/linux36/static
      #nodeSelector: #位置在当前containers参数结束后的部分
      #  project: linux36 #指定的label标签     


---
kind: Service
apiVersion: v1
metadata:
  labels:
    app: linux36-tomcat-app1-service-label
  name: linux36-tomcat-app1-service
  namespace: linux36
spec:
  type: NodePort
  ports:
  - name: http
    port: 80
    protocol: TCP
    targetPort: 8080
    nodePort: 30003
  selector:
    app: linux36-tomcat-app1-selector

root@k8s-master:~/images/k8s-tomcat# kubectl apply -f tomcat-app1.yaml 
deployment.extensions/linux36-tomcat-app1-deployment configured
service/linux36-tomcat-app1-service unchanged

kubectl get pods -n linux36

2.k8s中nginx+tomcat实现动静分离

实现一个通用的nginx+tomcat动静分离web架构,即用户访问的静态页面和图片在由nginx直接响应,而动态请求则基于location转发至tomcat

2.1.nginx配置文件修改

修改了nginx配置文件,重新打镜像,上传到本地harbor

镜像创建可参考:​​https://blog.51cto.com/taowenwu/5235431​​

upstream tomcat_webserver 
  server linux36-tomcat-app1-service.linux36.svc.linux36.local:80;

server 
  location /myapp 
    proxy_pass http://tomcat_webserver;
    proxy_set_header Host $host;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Real-IP $remote_addr;
  

2.2.创建nginx业务pod

kind: Deployment
apiVersion: extensions/v1beta1
metadata:
  labels:
    app: linux36-nginx-deployment-label
  name: linux36-nginx-deployment
  namespace: linux36
spec:
  replicas: 1
  selector:
    matchLabels:
      app: linux36-nginx-selector
  template:
    metadata:
      labels:
        app: linux36-nginx-selector
    spec:
      containers:
      - name: linux36-nginx-container
        image: harbor.gesila.com/k8s/nginx-web1:v1
        #command: ["/apps/tomcat/bin/run_tomcat.sh"]
        #imagePullPolicy: IfNotPresent
        imagePullPolicy: Always
        ports:
        - containerPort: 80
          protocol: TCP
          name: http
        - containerPort: 443
          protocol: TCP
          name: https
        env:
        - name: "password"
          value: "123456"
        - name: "age"
          value: "18"
        resources:
          limits:
            cpu: 2
            memory: 2Gi
          requests:
            cpu: 500m
            memory: 1Gi

        volumeMounts:
        - name: linux36-images
          mountPath: /usr/local/nginx/html/webapp/images
          readOnly: false
        - name: linux36-static
          mountPath: /usr/local/nginx/html/webapp/static
          readOnly: false
      volumes:
      - name: linux36-images
        nfs:
          server: 192.168.47.47
          path: /data/k8sdata/linux36/images 
      - name: linux36-static
        nfs:
          server: 192.168.47.47
          path: /data/k8sdata/linux36/static





---
kind: Service
apiVersion: v1
metadata:
  labels:
    app: linux36-nginx-service-label
  name: linux36-nginx-service
  namespace: linux36
spec:
  type: NodePort
  ports:
  - name: http
    port: 80
    protocol: TCP
    targetPort: 80
    nodePort: 30002
  - name: https
    port: 443
    protocol: TCP
    targetPort: 443
    nodePort: 30443
  selector:
    app: linux36-nginx-selector

root@k8s-master:~/images/k8s-tomcat# kubectl apply -f nginx.yaml
deployment.extensions/linux36-nginx-deployment created
service/linux36-nginx-service created

2.3.查看

3.重新创建业务nginx pod

方式1.删除并重新创建nginx业务镜像

kubectl delete -f nginx.yaml
vim nginx.yaml
-------------------------------------------------------------
image: harbor.magedu.net/linux36/nginx-web1:v1 #更新镜像地址
-------------------------------------------------------------
kubectl apply -f nginx.yaml

方式2.更新nginx业务镜像版本号

#准备新版本nginx业务镜像
docker tag harbor.magedu.net/linux36/nginx-web1:v1 harbor.magedu.net/linux36/nginxweb1:v2
docker push harbor.magedu.net/linux36/nginx-web1:v2

#获取当前deployment
kubectl get deployment -n linux36
----------------------------------------------------------------------------------
NAME                             READY     UP-TO-DATE    AVAILABLE    AGE
linux36-nginx-deployment         1/1          1             1         7m30s
linux36-tomcat-app1-deployment   1/1          1             1         45m
----------------------------------------------------------------------------------

#执行更新nginx业务镜像版本
kubectl set image deployment/linux36-nginx-deployment linux36-nginxcontainer=harbor.magedu.net/linux36/nginx-web1:v2 \\
-n linux36deployment.extensions/linux36-nginx-deployment image updated