Initial commit

.gitignore

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+/whoamI

Dockerfile

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+# Create a minimal container to run a Golang static binary
+FROM scratch
+COPY whoamI /
+ENTRYPOINT ["/whoamI"]
+EXPOSE 80

README.md

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+# whoamI
+
+Tiny Go webserver that prints os information and HTTP request to output
+
+```sh
+$ docker run -d -P --name iamfoo emilevauge/whoami
+$ docker inspect --format '{{ .NetworkSettings.Ports }}'  iamfoo
+map[80/tcp:[{0.0.0.0 32769}]]
+$ curl "http://0.0.0.0:32769"
+Hostname :  6e0030e67d6a
+IP :  127.0.0.1
+IP :  ::1
+IP :  172.17.0.27
+IP :  fe80::42:acff:fe11:1b
+GET / HTTP/1.1
+Host: 0.0.0.0:32769
+User-Agent: curl/7.35.0
+Accept: */*
+```

app.go

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+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"github.com/gorilla/mux"
+	"os"
+	"net"
+)
+
+func main() {
+
+	r := mux.NewRouter()
+	r.HandleFunc("/", whoamI)
+	http.Handle("/", r)
+	fmt.Println("Starting up on 80")
+	log.Fatal(http.ListenAndServe(":80", nil))
+}
+
+func whoamI(w http.ResponseWriter, req *http.Request) {
+	hostname, _ := os.Hostname()
+	fmt.Fprintln(w, "Hostname : ", hostname)
+	ifaces, _ := net.Interfaces()
+	// handle err
+	for _, i := range ifaces {
+	    addrs, _ := i.Addrs()
+	    // handle err
+	    for _, addr := range addrs {
+	        var ip net.IP
+	        switch v := addr.(type) {
+	        case *net.IPNet:
+	                ip = v.IP
+	        case *net.IPAddr:
+	                ip = v.IP
+	        }
+					fmt.Fprintln(w, "IP : ", ip)
+	    }
+	}
+  req.Write(w)
+}

build.sh

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+#!/bin/sh
+CGO_ENABLED=0 go build -a --installsuffix cgo --ldflags="-s" -o whoamI
+docker build -t emilevauge/whoami .