Add Dockerfile for Windows

[lippertmarkus]

Adding Dockerfile for Windows. Unfortunately building OpenResty inside Docker during image build is currently not possible due to issues with MSYS2/Cygwin or similar environments (see docker/for-win#262).

Instead the Dockerfile is using the prebuilt binaries for Windows and also installs Perl. You can try the image on Windows:

docker pull lippertmarkus/openresty:windows
docker run lippertmarkus/openresty:windows

I would recommend AppVeyor for CI on Windows. It worked flawlessly in my tests, is free for open-source software and easy to integrate:

• Example build: https://ci.appveyor.com/project/lippertmarkus/docker-openresty/build/1.0.14
• Used config: https://github.com/lippertmarkus/docker-openresty/blob/master/appveyor.yml

[neomantra]

@lippertmarkus Thank you for this contribution and sorry for not replying right away. I think the approach of using the upstream OpenResty binaries is best. I intend to eventually slim down the number of Dockerfiles and keep just the OpenResty binaries and a couple others.

I will start setting up Appveyor for this.

Some minor fixes / notes....

Add # https://github.com/openresty/docker-openresty on the second line.

Add maintainer information as a label in the final image LABEL maintainer=""

Does there really need to be three FROMs? Can't the bottom image's FROM base just include everything from the first one?

[lippertmarkus]

@neomantra Thanks for the feedback, I commited the changes.

[neomantra]

All the Appveyor builds are working and you should see both openresty/openresty:windows and openresty/openresty:1.13.6.1-2-windows on Docker Hub.

I note that they are 6 GB. Is that normal for a Windows Docker image? Is there some easy cleanup we can do? The OpenResty Windows download is only 12 MB.

[lippertmarkus]

Perfect! You could update the image description on Docker Hub also (https://hub.docker.com/r/openresty/openresty/).

Unfortunately this is normal, yes. The base microsoft/windowsservercore image is just slightly smaller than 6 GB (https://hub.docker.com/r/microsoft/windowsservercore/tags/). This will hopefully get better with future images (microsoft/windowsservercore:1709 for Version 1709 of Windows Server is already "only" 3GB).

Also we can't use the smaller (~500 MB) microsoft/nanoserver images (https://hub.docker.com/r/microsoft/nanoserver/) as they only support running 64 bit binaries and nginx/openresty can't be compiled as a 64 bit binary as far as I know?

[neomantra]

Docker Hub updated, thanks for the reminder and the info about Windows image sizes.

[lippertmarkus]

To correct myself: It is possible to build 64 bit binary of nginx (e.g. http://kiyolee.blogspot.de/2012/04/building-nginx-120-with-64-bit-visual-c.html) but nginx doesn't officially provide them for downloading.
If openresty wants to support 64 bit binaries for Windows in future anyway I surely can change the Dockerfile to use the smaller microsoft/nanoserver as base image.

[agentzh]

@lippertmarkus Official OpenResty Win64 packages are already out:

https://groups.google.com/d/msg/openresty-en/bTfqTjshcX4/uP8qF0EpAgAJ

[lippertmarkus]

@agentzh Thanks for pointing this out!
@neomantra I tried it and it worked fine: lippertmarkus@649e0a7
Resulting image is around 560MB (https://hub.docker.com/r/lippertmarkus/openresty/tags/). Should we wait until the next formal release before publishing this? I will create another pull request then.

[neomantra]

Yes, let's wait and coordinate with the official OpenResty release of 1.13.6.2.