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.NET Core pod 无法连接到 Kubernetes 中的 SQL Server pod

如何解决.NET Core pod 无法连接到 Kubernetes 中的 SQL Server pod

我有一个 .NET Core pod，需要访问 Kubernetes（docker-desktop）中的 sql Server pod。 使用端口转发，我可以从 sql Server Management Studio 连接到该 sql Server。但是当我尝试从 .NET Core pod 连接时，它说

未找到或无法访问服务器

这是日志中的错误

[04:28:38 Error] Microsoft.EntityFrameworkCore.Database.Connection
An error occurred using the connection to database ''MyTestDatabase'' on server ''tcp:sqlserver-service,1433''.
[04:28:38 Error] Microsoft.EntityFrameworkCore.Query
An exception occurred while iterating over the results of a query for context type ''Web.Data.ApplicationDbContext''.
Microsoft.Data.sqlClient.sqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to sql Server. The server was not found or was not accessible. Verify that the instance name is correct and that sql Server is configured to allow remote connections. (provider: TCP Provider,error: 40 - Could not open a connection to sql Server)

我在容器中的连接字符串

Server=tcp:sqlserver-service,1433;User ID=sa;Password=myPass12;Initial Catalog=MyTestDatabase;MultipleActiveResultSets=true;Connection Timeout=30;

sql Server 部署 yml 文件

apiVersion: v1
kind: PersistentVolume
Metadata:
  name: sqldata
spec:
  capacity:
    storage: 2Gi
  accessModes:
    - ReadWriteMany
  hostPath:
    path: "/sqldata"
---
apiVersion: v1
kind: PersistentVolumeClaim
Metadata:
  name: dbclaim
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 2Gi
---
apiVersion: apps/v1
kind: Deployment
Metadata:
  name: sqlserver
spec:
  replicas: 1
  selector:
    matchLabels:
      app: sqlserver
  template:
    Metadata:
      labels:
        app: sqlserver
    spec:
      volumes:
        - name: sqldata-storage
          persistentVolumeClaim:
            claimName: dbclaim
      terminationGracePeriodSeconds: 10
      initContainers:
       - name: volume-permissions
         image: busyBox
         command: ["sh","-c","chown -R 10001:0 /var/opt/mssql"]
         volumeMounts:
         - mountPath: "/var/opt/mssql"
           name: sqldata-storage
      containers:
        - name: sqlserver1
          image: mcr.microsoft.com/mssql/server
          ports:
            - containerPort: 1433
          env:
            - name: MSsql_PID
              value: "Developer"
            - name: SA_PASSWORD
              value: "myPass12"
            - name: ACCEPT_EULA
              value: "Y"
          volumeMounts:
          - mountPath: "/var/opt/mssql/data"
            name: sqldata-storage
---
apiVersion: v1
kind: Service
Metadata:
  name: sqlserver-service
spec:
  ports:
  - name: sqlserver
    port: 1433
    targetPort: 1433
    protocol: TCP
  selector:
    name: sqlserver
  type: LoadBalancer
  

从 sql Server Management Studio 连接

我肯定错过了什么。

提前致谢

解决方法

 selector:
    name: sqlserver

 selector:
    app: sqlserver

023. 掌握 Pod-Pod 扩容和缩容

一 Pod 的扩容和缩容

1.1 手动缩容和扩容

  1 [root@uk8s-m-01 study]# vi nginx-deployment.yaml
  2 apiVersion: apps/v1beta1
  3 kind: Deployment
  4 metadata:
  5   name: nginx-deployment
  6 spec:
  7   replicas: 3
  8   template:
  9     metadata:
 10       labels:
 11         app: nginx
 12     spec:
 13       containers:
 14       - name: nginx
 15         image: nginx:1.7.9
 16         ports:
 17         - containerPort: 80

  1 [root@uk8s-m-01 study]# kubectl create -f nginx-deployment.yaml
  2 [root@uk8s-m-01 study]# kubectl scale deployment nginx-deployment --replicas=5	#扩容至5个
  3 [root@uk8s-m-01 study]# kubectl get pods	                                	#查看扩容后的Pod

  1 [root@uk8s-m-01 study]# kubectl scale deployment nginx-deployment --replicas=2	#缩容至2个
  2 [root@uk8s-m-01 study]# kubectl get pods

1.2 自动扩容机制

1.3 HorizontalPodAutoscaler

  1 [root@uk8s-m-01 study]# vi php-apache-autoscaling-v1.yaml
  2 apiVersion: autoscaling/v1
  3 kind: HorizontalPodAutoscaler
  4 metadata:
  5   name: php-apache
  6 spec:
  7   scaleTargetRef:
  8     apiVersion: apps/v1
  9     kind: Deployment
 10     name: php-apache
 11   minReplicas: 1
 12   maxReplicas: 10
 13   targetCPUUtilizationPercentage: 50

  1 [root@uk8s-m-01 study]# vi php-apache-autoscaling-v2.yaml
  2 apiVersion: autoscaling/v2beta2
  3 kind: HorizontalPodAutoscaler
  4 metadata:
  5   name: php-apache
  6 spec:
  7   scaleTargetRef:
  8     apiVersion: apps/v1
  9     kind: Deployment
 10     name: php-apache
 11   minReplicas: 1
 12   maxReplicas: 10
 13   metrics:
 14   - type: Resource
 15     resource:
 16       name: cpu
 17       target:
 18         type: Utilization
 19         averageUtilization: 50

  1  metrics:
  2   - type: Pods
  3     pods:
  4       metrics:
  5         name: packets-per-second
  6       target:
  7         type: AverageValue
  8         averageValue: 1k

CocoaPods pod install/ pod update( 安装/更新代码库)超级慢问题

最近使用CocoaPods来添加/删除第三方类库时，无论是执行pod install还是pod update都无限卡住了。原因在于当执行以上两个命令的时候会升级CocoaPods的spec仓库，因此解决此问题的办法就是忽略这个监测升级CocoaPods的仓库的步骤，那么怎么来忽略这个步骤来提升安装或更新步骤呢，

只需要在命令中加个参数即可，命令如下：

$ pod install --verbose --no-repo-update

$ pod update --verbose --no-repo-update

或者

$ pod install --no-repo-update

$ pod update --no-repo-update

解决办法 : $ pod repo update 

原因:你本地的repo库太长时间没有更新了

题外：gem版本过老

gem是管理Ruby库和程序的标准包，如果它的版本过低也可能导致安装失败，解决方案自然是升级gem，执行下述命令即可：

$ sudo gem update --system

CocoaPods pod install/pod update更新慢的问题

最近使用CocoaPods来添加第三方类库，无论是执行pod install还是pod update都卡在了Analyzing dependencies不动

原因在于当执行以上两个命令的时候会升级CocoaPods的spec仓库，加一个参数可以省略这一步，然后速度就会提升不少。加参数的命令如下：

pod install --verbose --no-repo-update

pod update --verbose --no-repo-update

关于制作 Swift 和 Objective-C Mixed 的 Pod和swift制作app的介绍现已完结，谢谢您的耐心阅读，如果想了解更多关于.NET Core pod 无法连接到 Kubernetes 中的 SQL Server pod、023. 掌握 Pod-Pod 扩容和缩容、CocoaPods pod install/ pod update( 安装/更新代码库)超级慢问题、CocoaPods pod install/pod update更新慢的问题的相关知识，请在本站寻找。