Why Does My Go Docker Web App Fail with a 'no such file or directory' Error?

Running Docker with Go Basic Web App: "no such file or directory" Error

When trying to run a basic web application in Go using Docker, users may encounter the following error:

standard_init_linux.go:190: exec user process caused "no such file or directory"

This error occurs because the binary executable for the web application is missing a required library or interpreter. In this specific case, it is missing the libc library, which is dynamically linked to the binary by default when the net package is imported.

To resolve this issue, the following steps can be taken:

1. Compile the binary with cross-compilation flags:

   CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -tags netgo -ldflags '-w' -o mybin *.go

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   These flags disable cross-compilation, specify the target operating system and architecture, and remove debugging information from the binary.

2. Use the compiled binary in the Docker image:

   Replace the CMD instruction in the Dockerfile with the following:

   CMD ["mybin"]

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By following these steps, the user can compile the Go web application binary correctly, linking the necessary libraries, and eliminating the "no such file or directory" error when running the application in a Docker container.

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