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CONTAINER.md

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This document explains how to run a licensed version of the SDK inside a container. You can ignore it if you're using the trial version.

As explained at https://www.doubango.org/pricing.html our licensing model is per device/machine. Each machine is uniquely identified using the hardware information (CPU model, motherboard, architecture, hard drive serial number...). The hardware information doesn't change even if the OS is (up/down)-graded or reinstalled. We don't use network information like the MAC address to make sure the SDK can work without NIC.

The machine's unique identifier is built from the hardware information and generated as base64 encrypted key using the runtimeKey application. You don't need to build the application by yourself, use the pre-built binaries. Once you have the runtime key you can generate the token (license) using the activation function. More information about the process at https://www.doubango.org/SDKs/LicenseManager/docs/.

This document is about using docker containers on Ubuntu 18. Please contact us for any other scenario.

The issue

The problem with a container or any virtual machine is that you don't have access to the devices (hard drive, usb...) attached to the host machine. It's possible to run a container as super user using --privileged option in order to have complet access to the host but we are avoiding it for obvious reasons.

The solution

A container can have access to the CPU information used by our license manager but not to the information related to the hard drive or motherboard. The solution is to give a container the rights to have access to the missing information. We only provide read only access for security reasons and we highly recommend running the container as non root user.

We consider you already have docker correctly installed. If not, we recommend the guide at https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-ubuntu-18-04.

Pull your image (optional)

Only required if you don't already have your own image. In our case we are using ubuntu image.

docker pull ubuntu

To check that the image is correctly downloaded: docker images.

Run a container

To run a container using the previously downloaded image (ubuntu) you'll need some additional parameters. The command:

docker run -v /run/udev:/run/udev:ro -v /dev:/dev:ro -it ubuntu
  • -v /run/udev:/run/udev:ro: The format is "name of the volume to mount:the destination:the access rights". In this case we need ro (read-only) access rights. More info at https://docs.docker.com/storage/volumes/
  • -v /dev:/dev:ro: See above

In short, we want to allow the udev tool running inside a container to get access to the hardware information on the host. udev runs on userspace and doesn't require root access. The SDK will run udevadm info --query=property --name=... to retrieve hardware information. You can run the same command inside the container to check if the SDK will succeed.

Setup (inside the container)

  • Update:
apt update

apt install udev

That's it, now you're ready to run the runtimeKey application to generate the runtime key for activation.