启动第一个pod项目

拼搏现实的明天。 2022-12-01 14:21 137阅读 0赞

1、拉取服务器上的代码

[root@master code]# svn checkout https://192.168.0.167/svn/front .

2、编译代码

[root@master code]# mvn install
    [INFO] Scanning for projects...
    [WARNING] 
    。。。。。。。。。。。。。。。。。。。。。
    
    [INFO] ------------------------------------------------------------------------
    [INFO] BUILD SUCCESS
    [INFO] ------------------------------------------------------------------------
    [INFO] Total time: 26.383 s
    [INFO] Finished at: 2020-08-27T17:12:31+08:00
    [INFO] Final Memory: 38M/313M
    [INFO] ------------------------------------------------------------------------

3、编写dockerfile文件，文件内容如下

[root@master images]# cat Dockerfile 
    FROM java:8
    
    VOLUME /app
    
    COPY gxzx_atc_web-0.0.1-SNAPSHOT.jar atc-web.jar
    
    RUN ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
    RUN echo 'Asia/Shanghai' >/etc/timezone
     
    RUN bash -c "touch /atc-web.jar"
    EXPOSE 8020
    ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./uranedom","-jar","-Dspring.config.location=/config","-Dspring.profiles.active=docker-linux", "-Duser.timezone=GMT+08", "/atc-web.jar"]

4、打镜像

[root@master images]# cp ../code/target/gxzx_atc_web-0.0.1-SNAPSHOT.jar .
    [root@master images]# ls
    Dockerfile  gxzx_atc_web-0.0.1-SNAPSHOT.jar
    [root@master images]# docker build -t otc-web:v1.0.0 .
    Sending build context to Docker daemon  75.54MB
    Step 1/8 : FROM java:8
     ---> d23bdf5b1b1b
    Step 2/8 : VOLUME /app
     ---> Using cache
     ---> 2ba1956e68fa
    Step 3/8 : COPY gxzx_atc_web-0.0.1-SNAPSHOT.jar atc-web.jar
     ---> 10f349221863
    Step 4/8 : RUN ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
     ---> Running in 0ac2e1fa8964
    Removing intermediate container 0ac2e1fa8964
     ---> 0bf04c5387e1
    Step 5/8 : RUN echo 'Asia/Shanghai' >/etc/timezone
     ---> Running in 8d5255c8389e
    Removing intermediate container 8d5255c8389e
     ---> f0e71e60e60e
    Step 6/8 : RUN bash -c "touch /atc-web.jar"
     ---> Running in 34db7c3b465d
    Removing intermediate container 34db7c3b465d
     ---> 443d43a1954a
    Step 7/8 : EXPOSE 8020
     ---> Running in a6198a8a161e
    Removing intermediate container a6198a8a161e
     ---> 9f5952689cf6
    Step 8/8 : ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./uranedom","-jar","-Dspring.config.location=/config","-Dspring.profiles.active=docker-linux", "-Duser.timezone=GMT+08", "/atc-web.jar"]
     ---> Running in 8831b9203e22
    Removing intermediate container 8831b9203e22
     ---> 9bc59d6ad830
    Successfully built 9bc59d6ad830
    Successfully tagged atc-web:v1.0.0
    
    [root@master images]# docker images |grep atc-web
    atc-web                                                                        v1.0.0              9bc59d6ad830        2 minutes ago       794MB

5、将我们的image推送到自己搭建的harbor上

（如果不推送的话记得将镜像上传到其他的两个节点机器上防止本地没有镜像而报错）

[root@master images]# docker tag atc-web:v1.0.0 registry.yunson.com/gridcloud/atc-web:v1.0.0
    [root@master images]# docker push registry.yunson.com/gridcloud/atc-web:v1.0.0
    The push refers to repository [registry.yunson.com/gridcloud/atc-web]
    9f5f06fbe50a: Pushed 
    00c9bd7ec6d8: Pushed 
    5b0c841d680a: Pushed 
    453108b1435e: Pushed 
    35c20f26d188: Mounted from gridcloud/organization 
    c3fe59dd9556: Mounted from gridcloud/organization 
    6ed1a81ba5b6: Mounted from gridcloud/organization 
    a3483ce177ce: Mounted from gridcloud/organization 
    ce6c8756685b: Mounted from gridcloud/organization 
    30339f20ced0: Mounted from gridcloud/organization 
    0eb22bfb707d: Mounted from gridcloud/organization 
    a2ae92ffcd29: Mounted from gridcloud/organization 
    v1.0.0: digest: sha256:aa7b08765923c7d9dc9cff2822cba9a0f93074d13ad96562d46bb18f4d7b6939 size: 2838

6、使用目录方式创建configmap

[root@master atc-config]# ls
    application.yml
    [root@master atc-config]# kubectl create configmap atc-config --from-file=/root/atc/images/atc-config/
    configmap/atc-config created
    
    [root@master otc-config]# kubectl get cm|grep atc
    atc-config                  1      15s

7、编写项目yaml文件

apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: atc-web
      labels:
        name: atc-web
    
    spec:
      replicas: 1
      selector:
        matchLabels:
          app: atc-web
      template:
        metadata:
          labels:
            app: atc-web
        spec:
          containers:
            - name: atc-web
              image: registry.yunson.com/gridcloud/atc-web:v1.0.0
              #imagePullPolicy: Never
              imagePullPolicy: IfNotPresent
              ports:
                - containerPort: 8080
                  protocol: TCP
              volumeMounts:
              - name: tz-config
                mountPath: /etc/localtime
              - name: atc-web-config
                mountPath: /config    
    
          volumes:
          - name: tz-config
            hostPath:
              path: /usr/share/zoneinfo/Asia/Shanghai
          - name: atc-web-config
            configMap:
              name: atc-config          #定义configmap名称
    
    ---
    kind: Service
    apiVersion: v1
    metadata:
      name: atc-web-service
    spec:
      selector:
        app: atc-web # 这个地方是app名称而不是node
      ports:
        - port: 8080
          targetPort: 8080
          nodePort: 31079
      type: NodePort

8、创建第一个pod

[root@master images]# kubectl create  -f atc-web.yaml 
    deployment.apps/atc-web created
    service/atc-web-service created

如上没有推送镜像到镜像仓库的配置yaml文件查出结果出现如下

[root@master images]# kubectl get pods |grep atc
    atc-web-775598dc6c-jfgtr             0/1     ErrImageNeverPull   0          40s

解决问题方法：

将imagePullPolicy的值改成 IfNotPresent然后将镜像推送到我们的镜像仓库

imagePullPolicy: IfNotPresent

然后再重启pod

[root@master images]# kubectl replace --force -f atc-web.yaml 
    deployment.apps "atc-web" deleted
    service "atc-web-service" deleted
    deployment.apps/atc-web replaced
    service/atc-web-service replaced

8.查看pod的状态

[root@master images]# kubectl get pod -o wide
    NAME                      READY   STATUS        RESTARTS   AGE   IP            NODE    NOMINATED NODE   READINESS GATES
    atc-web-bd44d94f8-l7t6d   1/1     Running       0          14m   10.244.1.81   node1   <none>           <none>

9、查询deployment的状态

[root@master images]# kubectl get deployment -o wide
    NAME      READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS   IMAGES                                         SELECTOR
    atc-web   1/1     1            1           15m   atc-web      registry.yunson.com/gridcloud/otc-web:v1.1.1   app=atc-web

10、查询服务状态

[root@master images]# kubectl get svc -o wide |grep atc
    atc-web-service             NodePort    10.109.32.158   <none>        8080:31079/TCP   12m    node=atc-web

11、查询pod的状态信息

[root@master images]# kubectl describe pod atc-web-bd44d94f8-l7t6d
    Name:         atc-web-bd44d94f8-l7t6d
    Namespace:    default
    Priority:     0
    Node:         node1/192.168.0.154
    Start Time:   Fri, 28 Aug 2020 20:48:28 +0800
    Labels:       app=otc-web
                  pod-template-hash=bd44d94f8
    Annotations:  <none>
    Status:       Running
    IP:           10.244.1.81
    IPs:
      IP:           10.244.1.81
    Controlled By:  ReplicaSet/otc-web-bd44d94f8
    Containers:
      otc-web:
        Container ID:   docker://1f37aa82169f3e5e11f1302228c65867cebdcdee0264a8c43268181d317ac345
        Image:          registry.yunson.com/gridcloud/otc-web:v1.1.1
        Image ID:       docker-pullable://registry.yunson.com/gridcloud/otc-web@sha256:010a554294bc82dbc30ef8a27d2220cfb5b9dd16c657d44e229bf28fd44768ed
        Port:           8080/TCP
        Host Port:      0/TCP
        State:          Running
          Started:      Fri, 28 Aug 2020 20:48:30 +0800
        Ready:          True
        Restart Count:  0
        Environment:    <none>
        Mounts:
          /config/ from otc-web-config (rw)
          /etc/localtime from tz-config (rw)
          /var/run/secrets/kubernetes.io/serviceaccount from default-token-lvzkd (ro)
    Conditions:
      Type              Status
      Initialized       True 
      Ready             True 
      ContainersReady   True 
      PodScheduled      True 
    Volumes:
      tz-config:
        Type:          HostPath (bare host directory volume)
        Path:          /usr/share/zoneinfo/Asia/Shanghai
        HostPathType:  
      atc-web-config:
        Type:      ConfigMap (a volume populated by a ConfigMap)
        Name:      atc-config
        Optional:  false
      default-token-lvzkd:
        Type:        Secret (a volume populated by a Secret)
        SecretName:  default-token-lvzkd
        Optional:    false
    QoS Class:       BestEffort
    Node-Selectors:  <none>
    Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                     node.kubernetes.io/unreachable:NoExecute for 300s
    Events:
      Type    Reason     Age   From               Message
      ----    ------     ----  ----               -------
      Normal  Scheduled  14m   default-scheduler  Successfully assigned default/atc-web-bd44d94f8-l7t6d to node1
      Normal  Pulled     14m   kubelet, node1     Container image "registry.yunson.com/gridcloud/atc-web:v1.1.1" already present on machine
      Normal  Created    14m   kubelet, node1     Created container atc-web
      Normal  Started    14m   kubelet, node1     Started container atc-web

12、查询服务信息

[root@master images]# kubectl describe svc atc-web
    Name:                     atc-web-service
    Namespace:                default
    Labels:                   <none>
    Annotations:              <none>
    Selector:                 node=atc-web
    Type:                     NodePort
    IP:                       10.109.32.158
    Port:                     <unset>  8080/TCP
    TargetPort:               8080/TCP
    NodePort:                 <unset>  31079/TCP
    Endpoints:                <none>
    Session Affinity:         None
    External Traffic Policy:  Cluster
    Events:                   <none>

13、注意一个问题，出现问题情况，我们通过内网可以访问

curl http://10.244.1.81:8080/swagger-ui.html，但是当我们使用服务器IP地址访问时我们则无法访问

出现问题的原因是因为我们在编写yaml文件时的ENDPOINTS对应的值为空

[root@master ~]# kubectl get endpoints 
    NAME                        ENDPOINTS            AGE
    kubernetes                  192.168.0.155:6443   127d
    atc-web-service             <none>               74s

解决办法：

修改我们的yaml配置文件service部分，下面注释部分是我们编写错误的部分

kind: Service
    apiVersion: v1
    metadata:
      name: atc-web-service
    spec:
      selector:
       #node: atc-web
        app: atc-web

重启我们的pod

14、此时查看我们的endpoint结果如下

[root@master ~]# kubectl get endpoints 
    NAME                        ENDPOINTS            AGE
    kubernetes                  192.168.0.155:6443   127d
    atc-web-service             10.244.1.90:8080     3s

15、最后我们在外网使用服务器IP访问

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2JhaWR1XzM4NDMyNzMy_size_16_color_FFFFFF_t_70][]

至此我们的第一个pod已成功运转

当我们一次性启动两个pod时，我们可以查看相关的信息如下

[root@master ~]# kubectl get pod -o wide
    NAME                                 READY   STATUS        RESTARTS   AGE     IP             NODE    NOMINATED NODE   READINESS GATES
    
    atc-web-79df8c9bcb-hzzc9             1/1     Running       0          6s      10.244.2.133   node2   <none>           <none>
    atc-web-79df8c9bcb-xcng8             1/1     Running       0          6s      10.244.1.91    node1   <none>           <none>
    
    
    [root@master ~]# kubectl get endpoints
    NAME                        ENDPOINTS                            AGE
    kubernetes                  192.168.0.155:6443                   127d
    atc-web-service             10.244.1.91:8080,10.244.2.133:8080   30s

16、将CLUSTER-IP换成固定的IP

更改service 的yaml文件如下

spec:
      clusterIP: 10.108.124.235

重启pod，如下我们可以看到我们的service

[root@master images]# kubectl get svc -o wide
    NAME                        TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE    SELECTOR
    kubernetes                  ClusterIP   10.96.0.1        <none>        443/TCP          127d   <none>
    atc-web-service             NodePort    10.108.124.235   <none>        8080:31079/TCP   5s     app=atc-web

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2JhaWR1XzM4NDMyNzMy_size_16_color_FFFFFF_t_70]: /images/20221123/a6e40fe289c74a5dbd80585aab0ebca7.png