docker run的golang Infinite for循环问题 [英] golang Infinite for loop problem with docker run

问题描述

我试图做简单的无限循环任务.不使用docker即可正常工作.但是当我使用docker时，它只会无限执行for循环的else部分.实际上可能是什么问题?码头工人在无限循环方面有问题吗?我的main.go文件如下所示.

 程序包主要进口 ("bufio""fmt""os")func main(){fmt.Println("H​​ello，World！....".)为了 {fmt.Print(->")var i intfmt.Scan(& i)如果i == 1 {fmt.Println("H​​ello，World！1")}如果i == 2 {fmt.Println("H​​ello，World！2")}如果i == 3 {fmt.Println("H​​ello，World！3")}如果i == 4 {fmt.Println("H​​ello，World！4")}如果i == 5 {fmt.Println("H​​ello，World！5")} 别的 {fmt.Println("H​​ello，World！else")}}} 

我也尝试了这些链接.

在没有docker的控制台上执行 go运行main.go

解决方案

无限循环是因为您的go程序正在等待输入，并且没有以交互方式启动容器.

要使其正常工作，您需要使用此命令(请注意 -it 选项):

 <代码> docker容器运行--rm --name hello -it hello 

I tried to do simple infinite for loop task. It is working fine without using docker. But when i used the docker,it only executes the else part of for loop infinitely. What may be problem actually? Is docker having problem with infinite for loop? My main.go file is shown below.

package main

 import (
"bufio"
"fmt"
"os"
 )

func main() {
 fmt.Println("Hello, World!.....")

 for {
    fmt.Print("-> ")
    var i int
    fmt.Scan(&i)
    if i == 1 {
        fmt.Println("Hello, World! 1")
    } else if i == 2 {

        fmt.Println("Hello, World! 2")
    } else if i == 3 {
        fmt.Println("Hello, World! 3")
    } else if i == 4 {
        fmt.Println("Hello, World! 4")
    } else if i == 5 {
        fmt.Println("Hello, World! 5")
    } else {
        fmt.Println("Hello, World! else")
        
    }

 }
}

I tried these link as well. Read line in golang How do I break out of an infinite loop in Golang But still of no use. I am trying to solve the problem since yesterday.

The docker file is as given below:

FROM golang:1.12.0-alpine3.9

RUN mkdir /app

ADD . /app

WORKDIR /app

RUN go build -o main .

CMD ["go","run","/app/main.go"]

I tried to build the docker using docker build -t hello . and run using docker run hello

Running with

docker run hello

Executing with console without docker go run main.go

解决方案

The infinite loop is because your go program is waiting for an input and you're not launching the container in interactive mode.

To make it work you need to use this command (note the -it option) :

docker container run --rm --name hello -it hello

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