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docker端口映射无法访问的解决

程序员文章站 2022-06-04 19:47:19
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表现

  • systemctl status docker,显示正常,可以pull,push,build
  • 宿主机访问外网没问题,可以连上ubuntu的阿里的源
  • 运行容器映射的端口在本机无法访问,用curl 127.0.0.1:端口,显示:
    curl: (56) Recv failure: Connection reset by peer
    
  • docker build的时候,使用apt-get install xx,无法访问,哪怕镜像源是国内的阿里之类的.
    在改为 docker build --network host后又可以了

原因:

docker的网桥出问题了,导致映射端口无效,docker run -d -p 8080:80, 非常确定容器内的应用正常启动,curl 127.0.0.1:8080失败

验证问题:

用于验证的镜像

  • 也可以直接下载已经写好的镜像: simple_server,直接验证

  • 用golang编写一个简单的http服务,编译为simple_server

    package main
    
    import (
    	"flag"
    	"fmt"
    	"net/http"
    )
    
    func indexHandler(w http.ResponseWriter, r *http.Request) {
    	fmt.Fprintf(w, "hello world")
    }
    
    func main() {
    	var port int
    	flag.IntVar(&port, "p", 8080, "端口号,默认为8080")
    	flag.Parse()
    	fmt.Println("监控在端口", port)
    	http.HandleFunc("/", indexHandler)
    	err := http.ListenAndServe(fmt.Sprintf(":%d", port), nil)
    	if err != nil {
    		fmt.Println("错误: ", err)
    	}
    }
    
    
  • 编写Dockerfile

    FROM ubuntu
    RUN echo 'deb http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse \n\
    deb-src http://mirrors.aliyun.com/ubuntu/ focal main restricted universe multiverse \n\
    deb http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse \n\
    deb-src http://mirrors.aliyun.com/ubuntu/ focal-security main restricted universe multiverse \n\	
    deb http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse \n\
    deb-src http://mirrors.aliyun.com/ubuntu/ focal-updates main restricted universe multiverse \n\
    deb http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse \n\
    deb-src http://mirrors.aliyun.com/ubuntu/ focal-proposed main restricted universe multiverse \n\
    deb http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse \n\
    deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports main restricted universe multiverse '>/etc/apt/sources.list
    
    RUN apt-get update -y
    RUN apt-get install curl -y
    
    COPY simple_server /home/
    CMD ["/home/simple_server", "-p", "80"]
    
  • 放在同一个目录,并执行: docker build . --network host -t simple_server, 目录:

    [[email protected] tmp]# tree server
    server
    ├── Dockerfile
    └── simple_server
    0 directories, 2 files
    

运行容器进行验证

  • 运行:docker run -d -p 8080:80 simple_server
  • 进入容器运行: curl 127.0.0.1, 成功打印:hello world
  • 在宿主机上运行: curl 127.0.0.1:8080, 一直卡住,然后报no route 之类的错误

解决

通过重建 docker0 网络解决问题

相关标签: docker golang