将 web 服务器命令复制到镜像中，但在运行容器时找不到。

huangapple
go评论125阅读模式
英文:

COPY web server command to image but not found when run container

问题

我按照使用BusyBox Docker镜像构建应用程序的完整指南来自定义一个镜像。

使用的代码是docker-busybox-example。

Dockerfile

  1. # 使用busybox作为基础镜像
  2. FROM busybox
  3. # 复制可执行文件
  4. COPY ./server /home/server
  5. # 运行可执行文件
  6. CMD /home/server

web server

  1. package main
  3. import (
  4.     "fmt"
  5.     "net/http"
  6. )
  8. func handler(w http.ResponseWriter, r *http.Request) {
  9.     fmt.Fprintf(w, "Hello World!")
  10. }
  12. func main() {
  13.     http.HandleFunc("/", handler)
  14.     fmt.Println("Server running...")
  15.     http.ListenAndServe(":8080", nil)
  16. }

使用GOOS=linux GOARCH=amd64 go build server.go将其编译为可执行文件server。

基于busybox构建的镜像

  1. [mymachine@localhost tmp]$ docker image build -t go-server . 
  2. Sending build context to Docker daemon  6.562MB                                                          
  3. Step 1/3 : FROM busybox                                                                                  
  4.  ---> beae173ccac6                                                                                       
  5. Step 2/3 : COPY ./server /home/server                                                                    
  6.  ---> Using cache                                                                                         
  7.  ---> 9d58653768ea                                                                                        
  8. Step 3/3 : CMD /home/server                                                                              
  9.  ---> Running in 994cce171c11                                                                             
  10. Removing intermediate container 994cce171c11                                                             
  11.  ---> 38996797b6d8                                                                                        
  12. Successfully built 38996797b6d8                                                                          
  13. Successfully tagged go-server:latest

当运行容器时，找不到server。我对此一无所知。

  1. [mymachine@localhost tmp]$ docker run -p 8080:8080 --rm -it go-server ls -l /home                              
  2. total 6408                                                                                               
  3. -rwxrwxr-x    1 root     root       6559402 Oct 13 19:53 server                                          
  4. [mymachine@localhost tmp]$ docker run -p 8080:8080 --rm -it go-server                                         
  5. /bin/sh: /home/server: not found

但对于这个应用程序，它可以正常工作。

  1. package main
  3. import "fmt"
  5. func main() {
  6. 	fmt.Println("hello world")
  7. }

它不支持Web服务器可执行文件吗？

docker: executable file not found in $PATH对此没有帮助。

有解决方案吗？

英文:

I follow Using the BusyBox Docker Image for Building Applications : A Complete Guide to customize an image.

Using code docker-busybox-example.

Dockerfile

  1. # Use busybox as the base image
  2. FROM busybox
  3. # Copy over the executable file
  4. COPY ./server /home/server
  5. # Run the executable file
  6. CMD /home/server

web server

  1. package main
  3. import (
  4.     "fmt"
  5.     "net/http"
  6. )
  8. func handler(w http.ResponseWriter, r *http.Request) {
  9.     fmt.Fprintf(w, "Hello World!")
  10. }
  12. func main() {
  13.     http.HandleFunc("/", handler)
  14.     fmt.Println("Server running...")
  15.     http.ListenAndServe(":8080", nil)
  16. }

compile as executable file server with GOOS=linux GOARCH=amd64 go build server.go

built image based busybox

  1. [mymachine@localhost tmp]$ docker image build -t go-server . 
  2. Sending build context to Docker daemon  6.562MB                                                          
  3. Step 1/3 : FROM busybox                                                                                  
  4.  ---> beae173ccac6                                                                                       
  5. Step 2/3 : COPY ./server /home/server                                                                    
  6.  ---> Using cache                                                                                        
  7.  ---> 9d58653768ea                                                                                       
  8. Step 3/3 : CMD /home/server                                                                              
  9.  ---> Running in 994cce171c11                                                                            
  10. Removing intermediate container 994cce171c11                                                             
  11.  ---> 38996797b6d8                                                                                       
  12. Successfully built 38996797b6d8                                                                          
  13. Successfully tagged go-server:latest

*when run the container, server is not found.I I have no clues about this.

  1. [mymachine@localhost tmp]$ docker run -p 8080:8080 --rm -it go-server ls -l /home                             
  2. total 6408                                                                                               
  3. -rwxrwxr-x    1 root     root       6559402 Oct 13 19:53 server                                          
  4. [mymachine@localhost tmp]$ docker run -p 8080:8080 --rm -it go-server                                         
  5. /bin/sh: /home/server: not found

but it works for this application

  1. package main
  3. import "fmt"
  5. func main() {
  6. 	fmt.Println("hello world")
  7. }

Does it not support web server executable file?

docker: executable file not found in $PATH is not helpful

Any solutions for this?

答案1

得分: 2

您的server是一个动态可执行文件...

  1. $ ldd server
  2.         linux-vdso.so.1 (0x00007ffcbdbd2000)
  3.         libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f3a78527000)
  4.         libc.so.6 => /lib64/libc.so.6 (0x00007f3a78325000)
  5.         /lib64/ld-linux-x86-64.so.2 (0x00007f3a78554000)

...而busybox镜像没有所需的运行时库。一个解决方案是使用其他替代品，例如：

  1. FROM ubuntu:22.04
  2. COPY ./server /home/server
  3. CMD ["/home/server"]

（我在这里修改了您的CMD语句，以便可以使用CTRL-C来终止容器。）

另一个选择是构建一个静态可执行文件：

  1. $ CGO_ENABLED=0 go build
  2. $ ldd server
  3.         not a dynamic executable

这在您的原始Dockerfile中可以正常工作。

英文:

Your server is a dynamic executable...

  1. $ ldd server
  2.         linux-vdso.so.1 (0x00007ffcbdbd2000)
  3.         libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f3a78527000)
  4.         libc.so.6 => /lib64/libc.so.6 (0x00007f3a78325000)
  5.         /lib64/ld-linux-x86-64.so.2 (0x00007f3a78554000)

...and the busybox image doesn't have any of the required runtime libraries. One solution is to use something other than busybox, e.g:

  1. FROM ubuntu:22.04
  2. COPY ./server /home/server
  3. CMD ["/home/server"]

(I've modified your CMD statement here so that it's possible to kill the container using CTRL-C.)

The other option is to build a static executable:

  1. $ CGO_ENABLED=0 go build
  2. $ ldd server
  3.         not a dynamic executable

This works fine with your original Dockerfile.

huangapple
  • 本文由 发表于 2022年10月14日 05:23:01
  • 转载请务必保留本文链接：https://go.coder-hub.com/74061957.html
  • docker
  • dockerfile
  • go
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