k8s部署java项目

# 一、制作镜像

代码语言：javascript复制

FROM tomcat 
LABEL maintainer www.ctnrs.com
RUN rm -rf /usr/local/tomcat/webapps/*
ADD target/ROOT /usr/local/tomcat/webapps/ROOT 

1、配置可信任（如果仓库是HTTPS访问不用配置）

vi /etc/docker/daemon.json

{ "insecure-registries": ["192.168.31.90"] }

2、将镜像仓库认证凭据保存在k8s secret中

kubectl create secret docker-registry registry-auth --docker-username=admin --dockerpassword=Harbor12345 --docker-server=192.168.31.90

3、在yaml中使用这个认证凭据

代码语言：javascript复制

imagePullSecrets:
- name: registry-auth

# 二、使用deployment控制器部署

configmap.yaml

代码语言：javascript复制

apiVersion: v1
kind: ConfigMap
metadata:
  name: java-demo-config
data:
    application.yml: |
        server:
          port: 8080
        spring:
          datasource:
            url: jdbc:mysql://localhost:3306/test?characterEncoding=utf-8
            username: root
            password: 123456789
            driver-class-name: com.mysql.jdbc.Driver
          freemarker:
            allow-request-override: false
            cache: true
            check-template-location: true
            charset: UTF-8
            content-type: text/html; charset=utf-8
            expose-request-attributes: false
            expose-session-attributes: false
            expose-spring-macro-helpers: false
            suffix: .ftl
            template-loader-path:
              - classpath:/templates/

deployment.yaml

代码语言：javascript复制

apiVersion: apps/v1
kind: Deployment
metadata:
  name: java-demo
spec:
  replicas: 1
  selector:
    matchLabels:
      project: www
      app: java-demo
  template:
    metadata:
      labels:
        project: www
        app: java-demo
    spec:
      imagePullSecrets:
      - name: registry-auth
      containers:
      - image: 192.168.31.90/microservice/java-demo:v1 
        name: java-demo
        volumeMounts:
        - name: config
          mountPath: "/usr/local/tomcat/webapps/ROOT/WEB-INF/classes/application.yml"
          subPath: application.yml
        resources:
          requests:
            cpu: 0.5
            memory: 500Mi
          limits: 
            cpu: 1
            memory: 1Gi
        livenessProbe:
          httpGet:
            path: /
            port: 8080
          initialDelaySeconds: 50
          periodSeconds: 10
        readinessProbe:
          httpGet:
            path: /
            port: 8080
          initialDelaySeconds: 50
          periodSeconds: 10
      volumes:
      - name: config
        configMap:
          name: java-demo-config 
          items:
          - key: "application.yml"
            path: "application.yml"

# 三、对外暴露应用

代码语言：javascript复制

apiVersion: v1
kind: Service
metadata:
  name: java-demo 
spec:
  selector:
    project: www
    app: java-demo
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8080 

# 四、部署数据库

代码语言：javascript复制

apiVersion: v1
kind: Secret
metadata:
  name: java-demo-db 
  namespace: default
type: Opaque
data:
  mysql-root-password: "MTIzNDU2"
  mysql-password: "MTIzNDU2"
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: java-demo-db 
  namespace: default
spec:
  selector:
    matchLabels:
      project: www
      app: mysql
  template:
    metadata:
      labels:
        project: www
        app: mysql
    spec:
      containers:
      - name: db
        image: mysql:5.7.30
        resources:
          requests:
            cpu: 500m
            memory: 512Mi
          limits: 
            cpu: 500m
            memory: 512Mi
        env:
        - name: MYSQL_ROOT_PASSWORD
          valueFrom:
            secretKeyRef:
              name: java-demo-db
              key: mysql-root-password
        - name: MYSQL_PASSWORD
          valueFrom:
            secretKeyRef:
              name: java-demo-db
              key: mysql-password
        - name: MYSQL_USER
          value: "aliang"
        - name: MYSQL_DATABASE
          value: "k8s"
        ports:
        - name: mysql
          containerPort: 3306
        livenessProbe:
          exec:
            command:
            - sh
            - -c
            - "mysqladmin ping -u root -p${MYSQL_ROOT_PASSWORD}"
          initialDelaySeconds: 30
          periodSeconds: 10
        readinessProbe:
          exec:
            command:
            - sh
            - -c
            - "mysqladmin ping -u root -p${MYSQL_ROOT_PASSWORD}"
          initialDelaySeconds: 5
          periodSeconds: 10
        volumeMounts:
        - name: data
          mountPath: /var/lib/mysql
        
      volumes:
      - name: data
        persistentVolumeClaim:
          claimName: java-demo-db
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: java-demo-db 
  namespace: default
spec:
  storageClassName: "managed-nfs-storage"
  accessModes:
    - "ReadWriteOnce"
  resources:
    requests:
      storage: "8Gi"
---
apiVersion: v1
kind: Service
metadata:
  name: java-demo-db
  namespace: default
spec:
  type: ClusterIP
  ports:
  - name: mysql
    port: 3306
    targetPort: mysql
  selector:
    project: www
    app: mysql 

java mysql 部署 镜像 配置

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