Thursday, June 30, 2016

Hello Docker on Windows

NOTE: 9/8/2016: This is an older post which I wrote few  months ago but never not posted.

After using docker on Linux for more than a  year it was finally time to try it on a different platform. Trying on docker on Windows Server 2016 TP4 was one way to try it out but the experience of that was bit more complicated. However when I heard about docker on Windows 10 I was initially surprised. Why? Well based on what I had seen and figured out that it really needed Hyper-V features to run which I assumed was only available on the Windows Server line.

I guess I was wrong. Using Control Panel -> Program & Features -> Turn Windows Features On or Off , there is a feature called Hyper-V which can be turned on.
Now before you start searching for it and trying to turn it on wait till you read the following to save you some hassles.

1. You need Windows 10 Pro (Sorry Windows 10 does not work)
2. You need a CPU which supports Virtualization and SLAT aka EPT.

With Task Manager -> Performance -> CPU it is easy to figure out if Virtualization is supported or not. But SLAT is another story. systeminfo or coreinfo is required to figure that out. You may be able to turn on some of the components of the Hyper-V on CPUs not supporting SLAT but that will not be enough.

I really had to cycle through few laptops using Intel Core2 Duo and Intel Pentium chips which do support Virtualization but did not support SLAT and finally came across my dusty desktop using AMD Phenom which had Virtualization with SLAT support on it. and running Windows 10 on it.

Of course then I applied for the Docker beta program on Windows. The invitation came yesterday and finally got a chance to download the docker binaries and install it.

Once the installation (as Administrator of course) finished it gave the option to Launch docker and after it finished launching the daemon in the background it showed a splash image as follows:

Good job Docker on the usability to show me what to do next:

Next I deploy an nginx server as follows

Woha!! If it did not strike you.. I am running Linux images here on Windows!!
Now I can access the same in a browser as http://docker/
(This I  would say was a  bit of struggle since I had not read the doc properly where I was trying with or http://localhost or http://LOCAL/ but only http://docker worked)

Overall very interesting and game changing for development on Windows!.

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