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docker部署golang http服務(wù)時(shí)端口無(wú)法訪問(wèn)的問(wèn)題解決

更新時(shí)間：2022年08月05日 10:12:05 作者：冬天里的懶貓

本文主要介紹了docker部署golang http服務(wù)時(shí)端口無(wú)法訪問(wèn)的問(wèn)題解決，文中通過(guò)示例代碼介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值，需要的朋友們下面隨著小編來(lái)一起學(xué)習(xí)學(xué)習(xí)吧

1.背景

1.1 問(wèn)題描述

問(wèn)題描述： docker鏡像啟動(dòng)成果之后，通過(guò)curl不能訪問(wèn)：

[root@hecs-205828 ~]# curl -XGET http://127.0.0.1:8360/hello
curl: (56) Recv failure: Connection reset by peer

1.2 webserver代碼

go文件：main.go

package main

import (
   "fmt"
   "net/http"
   "os"
   "strings"
)

func main() {
   http.HandleFunc("/hello", handler_hello)
   http.HandleFunc("/healthz", handler_healthz)
   http.ListenAndServe("127.0.0.1:8360", nil)
}

func handler_healthz(w http.ResponseWriter, r *http.Request) {
   w.WriteHeader(http.StatusOK)
   w.Write([]byte("OK"))
}

func handler_hello(w http.ResponseWriter, r *http.Request) {
   fmt.Println("method = ", r.Method)
   fmt.Println("URL = ", r.URL)
   fmt.Println("RemoteAddr = ", r.RemoteAddr)
   fmt.Println("IP = ", strings.Split(r.RemoteAddr, ":")[0])
   fmt.Println("header = ", r.Header)
   fmt.Println("body = ", r.Body)
   fmt.Println(r.RemoteAddr, "連接成功")

   for name, values := range r.Header {
      for _, value := range values {
         fmt.Println(name, value)
         _, exits := w.Header()[name]
         if exits {
            w.Header().Add(name, value)
         } else {
            w.Header().Set(name, value)
         }
      }
   }
   VERSION := os.Getenv("VERSION")
   fmt.Println("VERSION is ：", VERSION)
   w.Header().Set("VERSION", VERSION)
   w.WriteHeader(http.StatusOK)
   w.Write([]byte("hello http server"))
}

3.Dockerfile文件

Dockerfile文件：

FROM golang:1.17 AS build

WORKDIR /web-server/

COPY . .
ENV CGO_ENABLED=0
ENV GO111MODULE=on
ENV GOPROXY=https://goproxy.cn,direct
RUN GOOS=linux go build -installsuffix cgo -o web-server main.go

FROM busybox
COPY --from=build /web-server/web-server /web-server/web-server
EXPOSE 8360
ENV ENV local
WORKDIR /web-server/
ENTRYPOINT ["/web-server/web-server"]

2.問(wèn)題分析

發(fā)現(xiàn)curl無(wú)法訪問(wèn)docker容器中的服務(wù)，telnet結(jié)果如下：

[root@hecs-205828 ~]# telnet 127.0.0.1 8360
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
Connection closed by foreign host.

于是，打算采用命令進(jìn)入docker容器內(nèi)部查看：

[root@hecs-205828 ~]# docker ps -a
CONTAINER ID   IMAGE              COMMAND                  CREATED          STATUS          PORTS                                       NAMES
dfb2b46abd34   httpserver:0.0.1   "/web-server/web-ser…"   27 hours ago     Up 2 hours      0.0.0.0:8360->8360/tcp, :::8360->8360/tcp   relaxed_mccarthy

通過(guò)docer ps -a 得到容器id為dfb2b46abd34。進(jìn)入容器：

[root@hecs-205828 ~]# docker exec -it dfb2b46abd34 sh
/web-server # ps 
PID   USER     TIME  COMMAND
    1 root      0:00 /web-server/web-server
   38 root      0:00 sh
   94 root      0:00 sh
  101 root      0:00 ps
/web-server # netstat -an |grep 8360
tcp        0      0 127.0.0.1:8360          0.0.0.0:*               LISTEN      
/web-server #

可以看到，在容器內(nèi)部實(shí)際上8360端口已經(jīng)被監(jiān)聽(tīng)。容器訪問(wèn)應(yīng)該不存在問(wèn)題。容器內(nèi)部支持wget：

/web-server # wget -q -O -  http://127.0.0.1:8360/hello
hello http server
/web-server #

可以看到在docker服務(wù)內(nèi)部運(yùn)行是正常的。

查看其網(wǎng)絡(luò)端口衍射：

[root@hecs-205828 ~]# docker port  dfb2b46abd34 
8360/tcp -> 0.0.0.0:8360
8360/tcp -> :::8360

端口衍射也不存在問(wèn)題。那么問(wèn)題究竟出在什么地方呢？忽然想到，容器內(nèi)部的nestat監(jiān)聽(tīng)端口是127.0.0.1，于是瞬間明白了。在容器內(nèi)部的監(jiān)聽(tīng)端口為127.0.0.1的話，那么只能接受容器內(nèi)部來(lái)自127.0.0.1的本地回環(huán)訪問(wèn)。來(lái)自容器外外部的訪問(wèn)請(qǐng)求將被拒絕。因此，這個(gè)問(wèn)題的修復(fù)原因?qū)嶋H上很簡(jiǎn)單，只需要將main.go的中監(jiān)聽(tīng)ip改為0.0.0.0即可。

3.解決方案

果斷將監(jiān)聽(tīng)ip改為0.0.0.0：

func main() {
   http.HandleFunc("/hello", handler_hello)
   http.HandleFunc("/healthz", handler_healthz)
   http.ListenAndServe("0.0.0.0:8360", nil)
}

之后重新制作鏡像：

sudo docker build . -t httpserver:0.0.2

然后啟動(dòng)本地鏡像：

 sudo docker run -d -p 8260:8230 httpserver:0.0.2

啟動(dòng)之后：

[root@hecs-205828 ~]# docker ps -a
CONTAINER ID   IMAGE              COMMAND                  CREATED          STATUS          PORTS                                       NAMES
ae5e2bf431c7   httpserver:0.0.2   "/web-server/web-ser…"   50 minutes ago   Up 50 minutes   0.0.0.0:8260->8360/tcp, :::8260->8360/tcp   affectionate_nash
dfb2b46abd34   httpserver:0.0.1   "/web-server/web-ser…"   27 hours ago     Up 2 hours      0.0.0.0:8360->8360/tcp, :::8360->8360/tcp   relaxed_mccarthy
[root@hecs-205828 ~]#

之后再訪問(wèn)新增的容器，結(jié)果正常：

[root@hecs-205828 ~]# curl -XGET http://127.0.0.1:8260/hello
hello http server
[root@hecs-205828 ~]#

問(wèn)題解決。

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