利用Java应用制作一个docker镜像

[root@master ~]# yum -y install maven git
[root@master java]# yum -y install java-11-openjdk*
[root@master ~]# mkdir -p java

[root@master ~]# cd java/

[root@master java]# git clone https://gitee.com/forgotten/tomcat-java-demo.git

[root@master java]# ls
apache-tomcat-9.0.54.tar.gz  tomcat-java-demo

[root@master java]# cd tomcat-java-demo/
[root@master tomcat-java-demo]# mvn clean package
[root@master tomcat-java-demo]# mv target/ly-simple-tomcat-0.0.1-SNAPSHOT.war target/myapp.war

[root@master java]# cat Dockerfile 
FROM centos

ADD tomcat-java-demo/target/myapp.war /usr/local/apache-tomcat-9.0.54/webapps/myapp.war
ADD apache-tomcat-9.0.54.tar.gz /usr/local

RUN yum -y install java-11-openjdk*

EXPOSE 8080

WORKDIR /usr/local/apache-tomcat-9.0.54

ENTRYPOINT /usr/local/apache-tomcat-9.0.54/bin/startup.sh && tail -f /usr/local/apache-tomcat-9.0.54/logs/catalina.out

CMD ["/usr/local/apache-tomcat-9.0.54/bin/catalina.sh","start"]

[root@master java]# docker build -t dengzichen/java:v1 .

将镜像上传至docker hub仓库中

[root@master java]# docker login 
Login with your Docker ID to push and pull images from Docker Hub. If you don't have a Docker ID, head over to https://hub.docker.com to create one.
Username: dengzichen
Password: 
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store

Login Succeeded
[root@master java]# docker push dengzichen/java:v1 

编写service文件

[root@master java]# cat java.yml 
---
apiVersion: apps/v1
kind: Deployment
metadata: 
  name: java
spec: 
  replicas: 2
  selector: 
    matchLabels: 
      app: java
  template: 
    metadata: 
      labels: 
        app: java
    spec: 
      containers: 
      - name: java
        image: dengzichen/java:v1
        imagePullPolicy: IfNotPresent

---
apiVersion: v1
kind: Service
metadata: 
  name: java
spec: 
  type: NodePort
  ports: 
  - port: 80
    targetPort: 8080
    protocol: TCP
    nodePort: 31000
  selector: 
    app: java


[root@master test]# kubectl apply -f java.yaml 
deployment.apps/java created
service/java created

[root@master java]# kubectl get pods,svc
NAME                        READY   STATUS              RESTARTS   AGE
pod/java-75f796867c-jsndk   0/1     ContainerCreating   0          35s
pod/java-75f796867c-tpfnn   0/1     ContainerCreating   0          35s
pod/web-6cfcd88d4-4rh75     1/1     Running             1          12h
pod/web-6cfcd88d4-ql4k6     1/1     Running             1          12h

NAME                 TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
service/java         NodePort    10.101.248.9    <none>        80:31000/TCP   15s
service/kubernetes   ClusterIP   10.96.0.1       <none>        443/TCP        3d14h
service/web          NodePort    10.110.225.36   <none>        80:30000/TCP   12h

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