Kubernetes部署Java项目
安装Java环境以及Maven仓库
准备项目代码————>编译构建————>将产出得wae打到镜像中————>推送镜像仓库
1.准备编译环境
yum -y install java-1.8.0-openjdk maven -y
2.修改Maven镜像源
vim /etc/maven/settings.xml
<mirrors>
<mirror>
<id>central</id>
<mirrorOf>central</mirrorOf>
<name>aliyun maven</name>
<url>https://maven.aliyun.com/repository/public</url>
</mirror>
</mirrors>
3.编译构建(在Java目录下执行)
mvn clean package -D maven.skip.test=true
参数：
maven.skip.test=true : 跳过maven单元检测
镜像制作
1.编写dockerfile
vim dockerfile
FROM tomcat:8
RUN rm -rf /usr/local/tomcat/webapps/*
ADD tartget/*.war /usr/local/tomcat/webapps/ROOT.war
2.构建镜像
docker build -t java-demo:v1 .
3.修改java应用连接数据库信息
server:
port: 8080
spring:
datasource:
url: jdbc:mysql://java-demon-db:3306/test?characterEncoding=utf-8 #定义数据库信息
username: root
password: 123456
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/
4.将镜像推送到自己得私有仓库
#登陆dockerHub
docker login
#将构建的镜像打tag
docker tag java-demon:v1 seven7num/java-demon:v1
#将镜像推送至DockerHub仓库
docker push seven7num/java-demon:v1
部署应用到k8s
1.部署java应用的deployment
#创建应用
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: web
name: java-demon
spec:
replicas: 1
selector:
matchLabels:
app: web
project: java
template:
metadata:
labels:
app: web
project: java
spec:
containers:
- image: seven7num/java-demon:v1
name: java-demon
imagePullPolicy: IfNotPresent
env:
- name: DEMO_GREETING
value: "Hello from the environment"
- name: DEMO_FAREWELL
value: "Such a sweet sorrow"
resources:
requests:
memory: "1Gi"
cpu: "0.5"
limits:
memory: "10Gi"
cpu: "1"
livenessProbe:
httpGet:
path: /
port: 8080
initialDelaySeconds: 60
periodSeconds: 10
readinessProbe:
httpGet:
path: /
port: 8080
initialDelaySeconds: 60
periodSeconds: 10
#查看pod详情
kubectl describe pod web
查看pod状态
kubectl get pod
2.发布应用
#发布应用并暴露端口
apiVersion: v1
kind: Service
metadata:
name: java-demon
spec:
selector:
app: web
project: java
ports:
- protocol: TCP
port: 80
nodePort: 30010
targetPort: 8080
type: NodePort
#查看应用
kubectl get service
3.部署pv持久存储
apiVersion: v1
kind: PersistentVolume
metadata:
name: mysql-pv
spec:
capacity:
storage: 5Gi
volumeMode: Filesystem
accessModes:
- ReadWriteOnce
persistentVolumeReclaimPolicy: Recycle
hostPath:
path: /data
4.利用secret部署mysql的deployment，service以及pvc
apiVersion: v1
kind: Secret
metadata:
name: java-demon-db
namespace: default
type: Opaque
data:
mysql-root-password: "MTIzNDU2"
mysql-password: "MTIzNDU2"
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: java-demon-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-demon-db
key: mysql-root-password
- name: MYSQL_PASSWORD
valueFrom:
secretKeyRef:
name: java-demon-db
key: mysql-password
- name: MYSQL_USER
value: "qihao"
- 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: mysql-pv-claim
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mysql-pv-claim
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 5Gi
---
apiVersion: v1
kind: Service
metadata:
name: java-demon-db
namespace: default
spec:
type: ClusterIP
ports:
- name: mysql
port: 3306
targetPort: mysql
selector:
project: www
app: mysql
#访问页面 curl http://nodeip
