Is there is anyway to get host Mac and ip address inside docker container using java progams

Question

I have tried below program on System it returns the host IP address but when running as docker container its give container IP

public static Map<String, String> getMAC(){
        Map<String, String> dataMap = new HashMap<>();
        try{
            InetAddress inetaddress=InetAddress.getLocalHost(); //Get LocalHost refrence
            String ip = inetaddress.getHostAddress();  // Get Host IP Address
            dataMap.put("ip", ip);
            //get Network interface Refrence by InetAddress Refrence
            NetworkInterface network = NetworkInterface.getByInetAddress(inetaddress);
            byte[] macArray = network.getHardwareAddress();  //get Harware address Array
            StringBuilder str = new StringBuilder();

            // Convert Array to String
            for (int i = 0; i < macArray.length; i++) {
                str.append(String.format("%02X%s", macArray[i], (i < macArray.length - 1) ? "-" : ""));
            }
            String macAddress=str.toString();
            dataMap.put("mac", macAddress);
            //return dataMap; //return MAc Address
        }
        catch(Exception E){
            E.printStackTrace();  //print Exception StackTrace
            //return null;
        }
        return dataMap;
    }

Answer 1

According to Docker docs , you can get the host's IP address by resolving host.docker.internal . So try changing the first line in the try block to:

InetAddress inetaddress=InetAddress.getByName("host.docker.internal");

This is for development purpose and will not work in a production environment outside of Docker Desktop for Mac.