Building a Go web application Docker image

In this recipe, we will build a Docker image that connects to the MySQL database instance running in a separate Docker container.

How to do it...

1. Create http-server.go, where we will create a simple HTTP server and a handler which will give us the current database details, such as machine IP, hostname, port, and selected database, as follows:

package main
import 
(
  "bytes"
  "database/sql"
  "fmt"
  "log"
  "net/http"
  "github.com/go-sql-driver/mysql"
  "github.com/gorilla/mux"
)
var db *sql.DB
var connectionError error
const 
(
  CONN_PORT = "8080"
  DRIVER_NAME = "mysql"
  DATA_SOURCE_NAME = "root...