在Docker容器（Ubuntu）的Windows中创建的Run Go应用程序

Question

I created very simple application that put to output some text.

My development environment is Windows + Docker for Windows. I created ubuntu container and after build my application in Windows for ubuntu

set GOARCH=amd64
set GOOS=linux
go build -o "myapp"

Then I copy 'myapp' file to shared folder and see it in shared folder of my container. After I try to run it inside container but there is an error

Why can't I run it? Was it built incorrectly or do I try to execute it in some wrong way?

In windows I have this output when I run my exe file and I want something the same in Ubuntu.

UPDATE As suggested I try ./myapp and there is Exec format error

Answer 1

On ubuntu and other linux systems, just myapp will try to find myapp from the PATH environment variable. To look specifically for an executable inside the current directory, you need to use:

./myapp

Or use the complete path:

/__shared/myapp

UPDATE: for this to work, your file need to be executable. You can verify it using ls -l:

ls -l
-rwxrwxr-x  1 user user    0 Feb  9 09:45 myapp

If you don't see at least one 'x' in the first column, you need to run:

chmod +x myapp

See understanding-linux-file-permissions for more information on the subject.

UPDATE: the error cannot execute binary file: Exec format error' could come from:

• a mismatch between the system architecture and the file --> ensure your ubuntu machine is a 64-bit version and compare the output of uname -a and file myapp
• according to this thread, running a file inside the shared folder of the VM (with windows host) can cause trouble --> try to copy myapp outside the shared folder