利用k8s部署Java项目

[root@k8s-master ~]# tree javaweb/
javaweb/
├── Dockerfile
└── files
    └── reduce-beta-1.0.jar

制作镜像

[root@k8s-master ~]# cat javaweb/Dockerfile 
FROM openjdk:18-jdk-alpine
  
COPY files/reduce-beta-1.0.jar /usr/local/reduce-beta-1.0.jar

ENTRYPOINT ["java","-jar","/usr/local/reduce-beta-1.0.jar"]
[root@k8s-master ~]# docker build -t xxkk/reduce:v1 javaweb/
Sending build context to Docker daemon  2.637MB
Step 1/3 : FROM openjdk:18-jdk-alpine
 ---> c89120dcca4c
Step 2/3 : COPY files/reduce-beta-1.0.jar /usr/local/reduce-beta-1.0.jar
 ---> 0e6f7bdff697
Step 3/3 : ENTRYPOINT ["java","-jar","/usr/local/reduce-beta-1.0.jar"]
 ---> Running in 589644d3483d
Removing intermediate container 589644d3483d
 ---> 896cae80a1a4
Successfully built 896cae80a1a4
Successfully tagged xxkk/reduce:v1

k8s的资源清单

[root@k8s-master manifes]# vim reduce.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: reduce
  labels:
    app: reduce
spec:
  replicas: 2
  selector:
    matchLabels:
      app: reduce
  template:
    metadata:
      name: reduce
      labels:
        app: reduce
    spec:
      containers:
      - image: xxkk/reduce:v1
        imagePullPolicy: IfNotPresent
        name: reduce
---
apiVersion: v1
kind: Service
metadata:
  name: reduce
spec:
  ports:
  - port: 8888
    targetPort: 8888
    nodePort: 31250
  selector:
    app: reduce
  type: NodePort   

[root@k8s-master manifes]# kubectl apply -f reduce.yaml 
deployment.apps/reduce created
service/reduce created
[root@k8s-master manifes]# kubectl get pod,svc
NAME                          READY   STATUS    RESTARTS   AGE
pod/reduce-665bf6b954-dnq5r   1/1     Running   0          6m48s
pod/reduce-665bf6b954-fz2lh   1/1     Running   0          6m48s

NAME                 TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
service/kubernetes   ClusterIP   10.96.0.1                443/TCP          9d
service/reduce       NodePort    10.105.173.252           8888:31250/TCP   6m49s