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

Error in Executing User Process in Docker with Go Web App

Issue

When running a Dockerized Go web application, an error is encountered indicating "no such file or directory" in standard_init_linux.go:190.

Go Code

package main

import (
    "fmt"
    "net/http"
    "os"
)

func hostHandler(w http.ResponseWriter, r *http.Request) {
    name, err := os.Hostname()

    if err != nil {
        panic(err)
    }

    fmt.Fprintf(w, "<h1>HOSTNAME: %s</h1><br>", name)
    fmt.Fprintf(w, "<h1>ENVIRONMENT VARS: </h1><br>")
    fmt.Fprintf(w, "<ul>")

    for _, evar := range os.Environ() {
        fmt.Fprintf(w, "<li>%s</li>", evar)
    }
    fmt.Fprintf(w, "</ul>")

}

func rootHandler(w http.ResponseWriter, r *http.Request) {

    fmt.Fprintf(w, "<h1>Awesome site in Go!</h1><br>")
    fmt.Fprintf(w, "<a href='/host/'>Host info</a><br>")

}

func main() {

    http.HandleFunc("/", rootHandler)
    http.HandleFunc("/host/", hostHandler)
    http.ListenAndServe(":8080", nil)

}

Docker File

FROM scratch
WORKDIR /home/ubuntu/go
COPY webapp /
EXPOSE 8080
CMD ["/webapp"]

Cause and Solution

The error arises because the compiled Go binary lacks a dependency on libc, which is brought in dynamically by default when importing net. To rectify this, compile the Go binary with the following flags:

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

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