构建Docker映像时Go构建失败

问题描述：

I'm a little new to golang and I'm still trying to get my head around the difference between go run main.go and go build [-o] main.go.

I've build a little gin app to try out locally with docker and kubernetes.

package main

import (
    "net/http"

    "github.com/gin-gonic/gin"
)

func main() {

    r := gin.Default()

    r.GET("/healthz", func(c *gin.Context) {
        c.String(http.StatusOK, "")
    })

    r.GET("/readinez", func(c *gin.Context) {
        c.String(http.StatusOK, "")
    })

    r.Run() // listen and serve on 0.0.0.0:8080
}

The app runs perfectly fine with go run main.go.

My Dockerfile:

FROM golang:latest
RUN mkdir /app
ADD . /app/
WORKDIR /app
RUN go build -o main .
CMD ["/app/main"]

It fails:

It is definitely in there and it also works when I go run main.go. What is the difference to build?

I'm not sure what to do here. Coming from a node background. This does drive a noobie somewhat mad... Sure there is an easy solution.

我对golang有点陌生，但我仍在努力弄清运行main.go code>和 go构建[-o] main.go code>。 p>

我已经构建了一个杜松子酒应用程序，可以在本地使用docker和kubernetes进行尝试。 p>


 包main 
 
import（
“ net / http” 
 
“ github.com/gin-gonic/gin"
)

func  main（）{
 
r：= gin.Default（）
 
 r.GET（“ / healthz”，func（c * gin.Context）{
 c.String（http.StatusOK，“”）  
}）
 
 r.GET（“ / readinez”，func（c * gin.Context）{
 c.String（http.StatusOK，“”）
}）
 
 r.Run  （）//收听并在0.0.0.0:8080
}上投放
  code>  pre> 
 
 应用程序运行 go main.go  code  >。   p> 
 
 
我的Dockerfile： p> 
 
 

  FROM golang：latest 
RUN mkdir / app 
ADD。  / app / 
WORKDIR / app 
RUN进行构建-o main。
CMD [“ / app / main”] 
  code>  pre> 
 
 失败： p> \  n 
 
    p> 
 
 
它肯定在其中，当我 go运行main.go   p> 代码>。 构建有什么区别？ p> 
 
 
我不确定在这里做什么。 来自节点背景。 这确实使Noobie有点生气。当然，有一个简单的解决方案。   p> 
  div>

答

The program succeeds on your machine because you probably have the gin package installed. You can't assume a container will have it, and should install it explicitly. Just add the following line to your dockerfile before the go build line:

RUN go get github.com/gin-gonic/gin

答

It may have failed because you used gin, and the library cannot be found inside the container. Try to use glide or godep to vendoring third party library.

答

go get github.com/gin-gonic/gin

Then it should work.

构建Docker映像时Go构建失败

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