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

") for _, evar := range os.Environ() { fmt.Fprintf(w, "
• %s
", evar) } fmt.Fprintf(w, "

") } func rootHandler(w http.ResponseWriter, r *http.Request) { fmt.Fprintf(w, "

Awesome site in Go!

") fmt.Fprintf(w, "Host info
") } 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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