C 应用程序服务器/客户端在 docker 容器中不起作用

Question

我是 Docker 的新手。我编写了一个服务器/客户端(非常简单)应用程序，它们都在同一个容器中运行。

我在 OSX 上工作，当我将客户端连接到服务器时，它工作得很好。

但是，我无法将我的客户端连接到我的服务器。这是我的代码:

客户端.c:

#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <arpa/inet.h>

int main(int argc, char *argv[])
{
    int sockfd = 0, n = 0;
    char recvBuff[1024];
    struct sockaddr_in serv_addr;

    if(argc != 2) {
      printf("\n Usage: %s <ip of server> \n",argv[0]);
      return 1;
    }
    memset(recvBuff, '0',sizeof(recvBuff));
    if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
      printf("\n Error : Could not create socket \n");
      return 1;
    }
    memset(&serv_addr, '0', sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(5000);
    if(inet_pton(AF_INET, argv[1], &serv_addr.sin_addr)<=0) {
      printf("\n inet_pton error occured\n");
      return 1;
    }

   int connect_value = connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr));
   if (connect_value < 0) {
     printf("Value of connect_value %d\n", connect_value);
     fprintf(stderr, "Value of errno: %d\n", errno);
     return (1);
   }

    while ( (n = read(sockfd, recvBuff, sizeof(recvBuff)-1)) > 0){
      recvBuff[n] = 0;
      if(fputs(recvBuff, stdout) == EOF)
        printf("\n Error : Fputs error\n");
    }
    if(n < 0)
      printf("\n Read error \n");
    return 0;
}

服务器.c

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <time.h>

int main(int argc, char *argv[])
{
    int listenfd = 0, connfd = 0;
    struct sockaddr_in serv_addr;

    char sendBuff[1025];
    time_t ticks;

    listenfd = socket(AF_INET, SOCK_STREAM, 0);
    memset(&serv_addr, '0', sizeof(serv_addr));
    memset(sendBuff, '0', sizeof(sendBuff));

    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    serv_addr.sin_port = htons(5000);

    bind(listenfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr));

    listen(listenfd, 10);

    while(1)
    {
        connfd = accept(listenfd, (struct sockaddr*)NULL, NULL);

        ticks = time(NULL);
        snprintf(sendBuff, sizeof(sendBuff), "%.24s\r\n", ctime(&ticks));
        write(connfd, sendBuff, strlen(sendBuff));

        close(connfd);
        sleep(1);
     }
}

我用来启动容器的命令行:

docker run -it --security-opt seccomp=unconfined --mount type=bind,src=/Users/steven/Documents/eip/firmware_coit,dst=/bidon 987steven/eip_linux bash

我编译运行的方式如下:

gcc server.c -o server && ./server

gcc client.c -o client && ./client 127.0.0.1

Error : Connect Failed Value of

connect_value -1

Value of errno: 111

在 SO 上发帖之前，我试图自己弄清楚，但大部分主题和阅读内容是:

• 如何将 unix-socket 连接到 docker-demon
• docker.sock
• docker 容器网络(官方文档)

但没有找到任何可以解决我的问题的东西。

需要说明的是，我对网络的总体了解很少，而且是 docker 的新手。请随时询问您是否收到我的其他信息。谢谢

Answer 1

问题解决!

我曾经使用以下方式启动我的容器:

 docker run -it --security-opt seccomp=unconfined --mount type=bind,src=/Users/steven/Documents/eip/firmware_coit,dst=/bidon 987steven/eip_linux bash

但我只需要在命令行中添加:

--net="host"

Alternatively you can run a docker container with network settings set to host. Such a container will share the network stack with the docker host and from the container point of view, localhost (or 127.0.0.1) will refer to the docker host.

来源:From inside of a Docker container, how do I connect to the localhost of the machine?