Docker在运行Go Server时没有响应

Question

I cannot stop docker golang web server in docker container by sending Interrupt Signal. I have following main.go:

package main

import (
    "log"
    "net/http"
)

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {      
        w.Write([]byte("hello"))
    })
    log.Fatal(http.ListenAndServe(":1818", nil))
}

And Dockerfile:

FROM golang:1.11.4-alpine3.8
WORKDIR /go/src/server
COPY main.go main.go
CMD ["go", "run", "main.go"]

I build:

docker build -t goserver .

and run image:

docker run -p 1818:1818 goserver

At this moment server is running. When I hit Ctrl+C in my console container (and server process) is still running and the only way to stop is by calling docker to do it. I would like to know how to handle such behaviour so that server and container stops when hitting Ctrl+C.

Docker version 18.09.1

Answer 1

You're using go run, so you're sending the signal to the go tool, not your server process. You can interrupt the sever started by go run in a shell, because ctrl+c in a shell sends the signal to the entire process group.

There's also no reason to compile the executable every time you start the container (which can incur much more overhead as your program expands). Building the executable when creating the image is more efficient, and lets you execute the server directly.

An example docker file:

FROM golang:1.11.4-alpine3.8
WORKDIR /go/src/server
COPY main.go main.go
RUN go build
CMD ["./server"]

See a similar question here, where the process is a shell rather than the go tool:

Sending signals to Golang application in Docker