Added healthcheck (#15)

* Update simple_http_server.go

* Update Dockerfile

Author: purvesh0110

Dockerfile

@@ -15,6 +15,7 @@ COPY . .
 # Build the application
 RUN go build -o simple_http_server ./simple_http_server.go
 
+
 # Move to /dist directory as the place for resulting binary folder
 WORKDIR /dist
 
@@ -24,6 +25,9 @@ RUN cp /build/simple_http_server .
 EXPOSE 8000
 
 # Build a small image
-FROM scratch
+FROM alpine
+RUN apk update && apk add curl
 COPY --from=builder /dist/simple_http_server /
+
+HEALTHCHECK --interval=5s --timeout=10s --retries=3 CMD curl -sS 127.0.0.1:8081/healthcheck || exit 1
 ENTRYPOINT ["/simple_http_server"]

simple_http_server.go

@@ -15,6 +15,7 @@ import (
 func main() {
 	http.HandleFunc("/", handler)
 	http.HandleFunc("/html/", htmlhandler)
+	http.HandleFunc("/healthcheck", healthhandler)
 	serverBrand := figure.NewColorFigure("Simple HTTP Server", "straight", "green", true)
 	serverBrand.Print()
 	myBrand := figure.NewColorFigure("by PareshPawar.com", "term", "green", true)
@@ -97,3 +98,7 @@ func handler(w http.ResponseWriter, r *http.Request) {
 	fmt.Fprintf(w, "                    by PareshPawar.com                    \n")
 	fmt.Fprintf(w, "----------------------------------------------------------\n")
 }
+
+func healthhandler(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintf(w, "OK\n")
+}