一 创建nfs(maste节点操作,两个node节点也需要安装)

1 首先安装一个nfs服务器,配置共享目录,

[yx@tidb-tidb-02 ~]$ cat /etc/exports
/home/yx/hnf *(rw,no_root_squash)
 然后启动nfs

2 然后在master上面创建一个nfs pv的动态供给,需要三个文件class.yaml deployment.yaml rbac.yaml

这三个文件去网上下载 https://github.com/kubernetes-incubator/external-storage/tree/master/nfs-client/deploy
rbac是让nfs有权限访问apiserver,其中需要更改的地方是deploynment.yaml里面的nfsip地址和nfs所共享的目录

kubectl create -f rbac.yaml
kubectl create -f class.yaml
kubectl create -f deployment.yaml #第一次创建的时候回提示存在,不知道什么原因,然后删除,再次创建即可

最后查看是否创建成功

[yx@tidb-tidb-03 nfs]$ kubectl get pods 
NAME READY STATUS RESTARTS AGE
nfs-client-provisioner-89bb89db6-gwdhn 1/1 Running 0 4m46s

二 自己搭建dockerhub私有仓库,或者注册公有仓库,下面的操作在node节点上操作

1拉取项目代码

1 拉取代码,通过git
git clone https://github.com/lizhenliang/tomcat-java-demo.git
2 编译,要进入到项目那个目录里面
yum install maven 安装编译所需要的命令
mvn clean package
第一次需要很长的时间

3 镜像打包
需要先登录  docker login  用户名和密码就是你注册时候的用户名和密码
sudo docker build -t huningfei/tomcat .   
sudo docker push huningfei/tomcat:latest   #上传到dockerhub的公有仓库

三 创建java项目的yaml文件(master上面)

1 创建命名空间 namespace

namespace.yaml

apiVersion: v1
kind: Namespace
metadata:
  name: test

2 创建deployment 先创建secret认证 ,否则不能下载镜像

因为我的镜像上传到了dockerhub的公有仓库,如果是私有的,后面还需要跟 --docker-server=dockerhub-ip地址

认证:

kubectl create secret docker-registry  registry-pull-secret --docker-username=huningfei --docker-password=password [email protected] -n test
## 查看是否创建成功

[yx@tidb-tidb-03 java-demo]$ kubectl get secret -n test
NAME                   TYPE                                  DATA   AGE
default-token-t2xwp    kubernetes.io/service-account-token   3      3m4s
registry-pull-secret   kubernetes.io/dockerconfigjson        1      34s

deployment.yaml 创建指定的pod

apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: tomcat-java-demo
  namespace: test
spec:
  replicas: 3
  selector:
    matchLabels:
      project: www
      app: java-demo
  template:
    metadata:
      labels:
        project: www
        app: java-demo
    spec:
      imagePullSecrets:
      - name: registry-pull-secret
      containers:
      - name: tomcat
        image: huningfei/tomcat:latest
        imagePullPolicy: Always
        ports:
        - containerPort: 8080
          name: web
          protocol: TCP
        resources:
          requests:
            cpu: 0.5
            memory: 1Gi
          limits:
            cpu: 1
            memory: 2Gi
        livenessProbe:
          httpGet:
            path: /
            port: 8080
          initialDelaySeconds: 60
          timeoutSeconds: 20
        readinessProbe:
          httpGet:
            path: /
            port: 8080
          initialDelaySeconds: 60
          timeoutSeconds: 20

创建deployment

kubectl create -f deployment.yaml   #创建

[yx@tidb-tidb-03 java-demo]$ kubectl get pods -n test  #查看是否创建成功
NAME                                READY   STATUS    RESTARTS   AGE
tomcat-java-demo-755456cdd6-49rcc   0/1     Running   0          61s
tomcat-java-demo-755456cdd6-khvsc   0/1     Running   0          61s
tomcat-java-demo-755456cdd6-n67dt   0/1     Running   0          61s

发现三个tomct容器创建成功了

3 创建service,把端口映射出去

kubectl create -f service.yaml

apiVersion: v1
kind: Service
metadata:
  name: tomcat-java-demo
  namespace: test
spec:
  selector:
    project: www
    app: java-demo
  ports:
  - name: web
    port: 80
    targetPort: 8080

4 创建ingress,为了使用域名访问(创建这个文件的是要提前部署好ingress mandatory.yaml)

kubectl create -f ingress.yaml

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

5 最后查看pod和svc

kubectl get pod,svc -n test
NAME                                    READY   STATUS    RESTARTS   AGE
pod/tomcat-java-demo-755456cdd6-49rcc   1/1     Running   0          6m13s
pod/tomcat-java-demo-755456cdd6-khvsc   1/1     Running   0          6m13s
pod/tomcat-java-demo-755456cdd6-n67dt   1/1     Running   0          6m13s

NAME                       TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE
service/tomcat-java-demo   ClusterIP   10.0.0.98            80/TCP    48s

#查看ingress在那个node上面
[yx@tidb-tidb-03 java-demo]$ kubectl get pods -n ingress-nginx -o wide
NAME                                        READY   STATUS    RESTARTS   AGE    IP               NODE             NOMINATED NODE
nginx-ingress-controller-7d8dc989d6-sfqcd   1/1     Running   0          2d5h   192.168.18.105   192.168.18.105   

6 创建mysql,数据库没必要让外网访问,所以不产生ip

mysql.yaml

kubectl create -f mysql.yaml

apiVersion: v1
kind: Service
metadata:
  name: mysql
  namespace: test
spec:
  ports:
  - port: 3306 
    name: mysql 
  clusterIP: None
  selector:
    app: mysql-public

---

apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: db
  namespace: test
spec:
  serviceName: "mysql"
  template:
    metadata:
      labels:
        app: mysql-public 
    spec:
      containers:
      - name: mysql
        image: mysql:5.7 
        env: 
        - name: MYSQL_ROOT_PASSWORD
          value: "123456"
        - name: MYSQL_DATABASE
          value: test
        ports: 
        - containerPort: 3306
        volumeMounts:
        - mountPath: "/var/lib/mysql"
          name: mysql-data
  volumeClaimTemplates:
  - metadata:
      name: mysql-data 
    spec:
      accessModes: ["ReadWriteMany"]
      storageClassName: "managed-nfs-storage"
      resources:
        requests:
          storage: 2Gi 

7 查看pv

kubectl get pv
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                  STORAGECLASS          REASON   AGE
pvc-73253e56-b425-11e9-b2ea-000c29bfd03f   2Gi        RWX            Delete           Bound    test/mysql-data-db-0   managed-nfs-storage            26m

8 进入数据库,导入表结构

kubectl exec -it db-0 bash -n test

然后把sql文件导入到数据库中,scp -r /home/yx/tomcat-java-demo/db/tables_ly_tomcat.sql 到maste上面
然后用kubeclt 直接拷贝到容器里面
kubectl cp /tmp/tables_ly_tomcat.sql db-0:/ -n test #db-0是pod的名字
最后在登陆到数据库中,source即可导入

9 更改数据库的ip,也就是mysql pod的名字

vim tomcat-java-demo/src/main/resources/application.yml
四 k8s里面部署java项目_第1张图片

前面是pod的名字,然后是service名字(serviceName),最后是namespace命名空间

10 改完之后需要重新构建镜像

 mvn clean package
然后sudo docker build -t huningfei/tomcat:1.0 .
推送 sudo docker push huningfei/tomcat:1.0   也可以指定别的版本,如2.0

然后可以去dockhub上面查看
四 k8s里面部署java项目_第2张图片

11 滚动更新pod

如果镜像名字有变化,需要先更改deployment.yaml

没有则直接 kubectl apply -f deployment.yaml 
然后查看是否在滚动更新
kubectl get pods -n test
下面这种情况说明在滚动更新,等最下面那个启动完成之后,原来的就删除掉一个

四 k8s里面部署java项目_第3张图片

12 最后绑定域名,浏览器查看java.ctnrs.com

#查看域名
[yx@tidb-tidb-03 java-demo]$ kubectl get ingress -n test 
NAME               HOSTS            ADDRESS   PORTS   AGE
tomcat-java-demo   java.ctnrs.com             80      139m

最后访问域名即可,测试功能是否正常