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In this tutorial we will show how to use the intuitive Mender server UI to deploy a full rootfs image update to a virtual device which is connected to the server. The virtual device is bundled with the Mender server to make it easy to test Mender.
The test environment should be set up and working successfully as described in Install a Mender demo server.
After a minute or two, there should be a virtual device that is pending authorization:
Follow the help tooltips in the UI to guide you through each step of deploying to your virtual device - authorizing the device, viewing information about it, uploading an Artifact file, and finally deploying your very first update to the device.
If you don't see the help tooltips, there is an option to toggle them on/off from the dropdown at your user email up at the top right corner of the screen.
There are security implications to connecting a client and server for the first time, also known as bootstrapping. If a client and server have not exchanged any information in advance, they need to accept each other on trust this first time, with the risk that the information the other party presents is spoofed. To mitigate this risk, the Mender client preinstalls the TLS certificate of the server when it is provisioned, as part of the Yocto Project image build. So it is not possible for a rogue server to intercept the connection from a client or pretend to be a different server, assuming server's private TLS key is securely managed. A rogue device can still spoof the information it sends to the server in order to be authorized, and this is why Mender asks you to make the authorization decision. However, the risk of letting the server manage a rogue device is much lower than the risk of a rogue server managing devices.
The console of the virtual device can be seen by running
docker logs $(docker ps | grep mender-client | cut -f1 -d' ').
Congratulations! If you followed the help tips successfully, you have used the Mender server to deploy your first managed update! If you have a Raspberry Pi 3 or BeagleBone Black, you can proceed to Deploy to physical devices to try out deploying to a real-world device.