英文:
unable to connect between curl in host and golang server in docker alpine
问题
golang代码：
fmt.Println("服务器启动中...")http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {name, _ := os.Hostname()resp := fmt.Sprintf("请求成功 %s", name)w.Write([]byte(resp))})http.ListenAndServe("127.0.0.1:8080", nil)
Dockerfile：
FROM alpine:latestCOPY ./server .CMD ["./server"]
然后运行它：
$ docker run --rm -p 8080:8080 server服务器启动中...
在容器中运行正常（需要安装curl）：
$ docker exec 3c3 -it curl localhost:8080请求成功 3c398d80ca79
但是在主机上无法正常工作：
$ curl localhost:8080curl: (52) Empty reply from server$ nc localhost 8080$ # nc立即退出
如果我运行nc -l -p 8080而不是./server：
$ docker run --rm -it -p 8080:8080 alpine:latest nc -l -p 8080
然后在主机上运行：
$ curl localhost:8080
然后我可以在容器中收到请求，一切正常。
那么在alpine镜像中使用curl访问golang服务器时出现了什么问题？
英文:
golang code:
fmt.Println("server starting...")http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {name, _ := os.Hostname()resp := fmt.Sprintf("hit %s", name)w.Write([]byte(resp))})http.ListenAndServe("127.0.0.1:8080", nil)
Dockerfile:
FROM alpine:latestCOPY ./server .CMD [ "./server" ]
Then run it:
$ docker run --rm -p 8080:8080 serverserver starting...
It works in container(after curl installed):
$ docker exec 3c3 -it curl localhost:8080hit 3c398d80ca79
But it doesn't work in host:
$ curl localhost:8080curl: (52) Empty reply from server$ nc localhost 8080$ # nc exit immediatly
If I run nc -l -p 8080 instead of ./server:
$ docker run --rm -it -p 8080:8080 alpine:latest nc -l -p 8080
and run it in host:
$ curl localhost:8080
Then I can get request in container, and everthing works well.
So what's the problem when curl the golang server in alpine image?
答案1
得分: 1
你的dockerfile中缺少EXPOSE 8080。
英文:
You're missing EXPOSE 8080 in your dockerfile
答案2
得分: -1
我使用http.ListenAndServe(":8080", nil)代替，一切都正常工作！
英文:
I use http.ListenAndServe(":8080", nil) instead, everthing works well!
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