验证服务是否连接到 pod？

Question

我使用以下 yaml 文件创建了一个服务器 pod：

apiVersion: v1
kind: Pod
 metadata:
   name: server
   labels:
     app: server
 spec:
   containers:
     - name: server
       imagePullPolicy: Never
       image: localhost:5000/server
       command: ['sh', '-c', 'echo Hello Kubernetes! && sleep 3600']
       ports:
         - containerPort: 80

我使用以下 yaml 文件为此 pod 创建了一个服务：

apiVersion: v1
kind: Service
metadata:
        name: server-svc
        labels:
                app: server
spec:
        ports:
        - port: 80
          protocol: TCP
        selector:
                app: server

我在与服务器 pod 相同的集群中使用以下 yaml 文件创建了一个客户端 pod：

 apiVersion: v1
 kind: Pod
 metadata:
   name: client
   labels:
     app: client
 spec:
   containers:
     - name: client
       imagePullPolicy: Never
       image: localhost.localdomain:5000/client
       command: ['sh', '-c', 'echo Hello Kubernetes! && sleep 3600']
       ports:
         - containerPort: 80

我想验证连接到此 server-svc 服务是否启用连接到服务器 pod。

对于我执行到客户端 pod 和服务器 pod 并尝试使用以下文件在两者之间建立 tcp 套接字连接。

server.c 在服务器 pod 内。

#include <stdio.h> 
#include <netdb.h> 
#include <netinet/in.h> 
#include <stdlib.h> 
#include <string.h> 
#include <sys/socket.h> 
#include <sys/types.h> 
#define MAX 80 
#define PORT 8080 
#define SA struct sockaddr 

 

// Function designed for chat between client and server. 
void func(int sockfd) 
{ 
    char buff[MAX]; 
    int n; 
    // infinite loop for chat 
    for (;;) { 
        bzero(buff, MAX); 

 

        // read the message from client and copy it in buffer 
        read(sockfd, buff, sizeof(buff)); 
        // print buffer which contains the client contents 
        printf("From client: %s\t To client : ", buff); 
        bzero(buff, MAX); 
        n = 0; 
        // copy server message in the buffer 
        while ((buff[n++] = getchar()) != '\n') 
            ; 

 

        // and send that buffer to client 
        write(sockfd, buff, sizeof(buff)); 

 

        // if msg contains "Exit" then server exit and chat ended. 
        if (strncmp("exit", buff, 4) == 0) { 
            printf("Server Exit...\n"); 
            break; 
        } 
    } 
} 

 

// Driver function 
int main() 
{ 
    int sockfd, connfd, len; 
    struct sockaddr_in servaddr, cli; 

 

    // socket create and verification 
    sockfd = socket(AF_INET, SOCK_STREAM, 0); 
    if (sockfd == -1) { 
        printf("socket creation failed...\n"); 
        exit(0); 
    } 
    else
        printf("Socket successfully created..\n"); 
    bzero(&servaddr, sizeof(servaddr)); 

 

    // assign IP, PORT 
    servaddr.sin_family = AF_INET; 
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY); 
    servaddr.sin_port = htons(PORT); 

 

    // Binding newly created socket to given IP and verification 
    if ((bind(sockfd, (SA*)&servaddr, sizeof(servaddr))) != 0) { 
        printf("socket bind failed...\n"); 
        exit(0); 
    } 
    else
        printf("Socket successfully binded..\n"); 

 

    // Now server is ready to listen and verification 
    if ((listen(sockfd, 5)) != 0) { 
        printf("Listen failed...\n"); 
        exit(0); 
    } 
    else
        printf("Server listening..\n"); 
    len = sizeof(cli); 

 

    // Accept the data packet from client and verification 
    connfd = accept(sockfd, (SA*)&cli, &len); 
    if (connfd < 0) { 
        printf("server acccept failed...\n"); 
        exit(0); 
    } 
    else
        printf("server acccept the client...\n"); 

 

    // Function for chatting between client and server 
    func(connfd); 

 

    // After chatting close the socket 
    close(sockfd); 
}

client.c 在客户端 pod 内：

#include <netdb.h> 
#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 
#include <sys/socket.h> 
#define MAX 80 
#define PORT 8080 
#define SA struct sockaddr 
void func(int sockfd) 
{ 
    char buff[MAX]; 
    int n; 
    for (;;) { 
        bzero(buff, sizeof(buff)); 
        printf("Enter the string : "); 
        n = 0; 
        while ((buff[n++] = getchar()) != '\n') 
            ; 
        write(sockfd, buff, sizeof(buff)); 
        bzero(buff, sizeof(buff)); 
        read(sockfd, buff, sizeof(buff)); 
        printf("From Server : %s", buff); 
        if ((strncmp(buff, "exit", 4)) == 0) { 
            printf("Client Exit...\n"); 
            break; 
        } 
    } 
} 

 

int main() 
{ 
    int sockfd, connfd; 
    struct sockaddr_in servaddr, cli; 

 

    // socket create and varification 
    sockfd = socket(AF_INET, SOCK_STREAM, 0); 
    if (sockfd == -1) { 
        printf("socket creation failed...\n"); 
        exit(0); 
    } 
    else
        printf("Socket successfully created..\n"); 
    bzero(&servaddr, sizeof(servaddr)); 

 

    // assign IP, PORT 
    servaddr.sin_family = AF_INET; 
    servaddr.sin_addr.s_addr = inet_addr("10.233.90.193"); 
    servaddr.sin_port = htons(PORT); 

 

    // connect the client socket to server socket 
    if (connect(sockfd, (SA*)&servaddr, sizeof(servaddr)) != 0) { 
        printf("connection with the server failed...\n"); 
        exit(0); 
    } 
    else
        printf("connected to the server..\n"); 

 

    // function for chat 
    func(sockfd); 

 

    // close the socket 
    close(sockfd); 
}

问题是当我在 client.c 中使用服务器 pod 的 IP 地址时，它建立了 TCP 连接。但是当我使用 server-svc 集群 IP 地址时，它无法连接。

我怀疑这个服务是否连接到服务器 pod。有什么办法可以验证吗？另外，如果它正在连接，我如何使用它建立 TCP 连接？

Answer 1

看起来您的服务器正在侦听端口 8080，您必须将服务设置为端口 8080 而不是 80，然后服务应该能够将流量传递到正确的位置。

验证服务是否连接到 pod？

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