1 部署应用步骤

• 制作镜像,镜像分类:基础镜像,中间件镜像,项目镜像.
• 控制器管理pod 控制器分类: deployment,statefulset,daemonset,job&cronjob
• pod数据持久化
• service
• 对外发布应用: service nodeport ingress

2 部署一个java项目

先打包
mvn clean package -DskipTests=true
Downloaded: https://repo.maven.apache.org/maven2/com/thoughtworks/xstream/xstream/1.4.9/xstream-1.4.9.jar (537 KB at 964.5 KB/sec)
[INFO] Packaging webapp
[INFO] Assembling webapp [ly-simple-tomcat] in [/root/tomcat-java-demo/target/ly-simple-tomcat-0.0.1-SNAPSHOT]
[INFO] Processing war project
[INFO] Webapp assembled in [286 msecs]
[INFO] Building war: /root/tomcat-java-demo/target/ly-simple-tomcat-0.0.1-SNAPSHOT.war
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1:53.386s
[INFO] Finished at: Thu Jun 03 01:34:42 GMT 2021
[INFO] Final Memory: 25M/175M
[INFO] ----------------------------------------------------------------------

dockerfile构建镜像推送到镜像仓储
 cat Dockerfile
FROM lizhenliang/tomcat 
MAINTAINER devops
RUN rm -rf /usr/local/tomcat/webapps/*
ADD target/*.war /usr/local/tomcat/webapps/ROOT.war

docker build -t tomcat -f Dockerfile ./
docker tag tomcat 192.168.10.20:8081/javademo/javademo:latest
推送到harbor
[root@gitlab tomcat-java-demo]# docker push  192.168.10.20:8081/javademo/javademo:latest

如下图已传到harbor

部署java-demo
创建k8s连接 harbor的认证
kubectl create secret docker-registry  dockerpullauth --docker-username=admin --docker-password=Harbor12345 --docker-server=192.168.10.20:8081
secret/dockerpullauth created

配置docker 
[root@k8s-node02 docker]# cat /etc/docker/daemon.json 
{
  "registry-mirrors": ["https://de378wx8.mirror.aliyuncs.com"],
   "insecure-registries":["192.168.10.20:8081"]

}
service docker force-reload

[root@k8s-master01 java-demo]# cat java-demo-deployment.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: java-demo
  name: java-demo
spec:
  replicas: 3
  selector:
    matchLabels:
      app: java-demo
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: java-demo
    spec:
      containers:
      - image: 192.168.10.20:8081/javademo/javademo:latest
        name: javademo

创建应用service
[root@k8s-master01 java-demo]# kubectl expose deployment java-demo --port=80 --target-port=8080 --type=NodePort --dry-run -o yaml > service.yaml
apiVersion: v1
kind: Service
metadata:
  labels:
    app: java-demo
  name: java-demo
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 8080
    nodePort: 30010
  selector:
    app: java-demo
  type: NodePort

通过暴露出来的端口就可以访问了

配置ingress

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: tomcat-java-demo
  namespace: default
spec:
  rules:
    - host: java.devopstack.cn
      http:
        paths:
        - path: /
          backend:
            serviceName: java-demo
            servicePort: 80

 kubectl apply -f ingress.yaml 

ingress.extensions/tomcat-java-demo created

[root@k8s-master01 java-demo]# kubectl get ingress
NAME               CLASS    HOSTS                                                      ADDRESS   PORTS     AGE

tomcat-java-demo   <none>   java.devopstack.cn                                                   80        6s

[root@k8s-master01 java-demo]# kubectl describe ingress tomcat-java-demo 
Name:             tomcat-java-demo
Namespace:        default
Address:          
Default backend:  default-http-backend:80 (<error: endpoints "default-http-backend" not found>)
Rules:
  Host                Path  Backends
  ----                ----  --------
  java.devopstack.cn  
                      /   java-demo:80 (10.244.2.138:8080,10.244.2.139:8080,10.244.2.140:8080)
Annotations:          Events:
  Type                Reason  Age    From                      Message
  ----                ------  ----   ----                      -------
  Normal              CREATE  3m25s  nginx-ingress-controller  Ingress default/tomcat-java-demo
  Normal              CREATE  3m25s  nginx-ingress-controller  Ingress default/tomcat-java-demo

如下图
通过ingress配置的域名已生效