Win10 Powershell support + CentOS 7 support

[ljay79]

• Extend Packer's Rakefile to have it run on windows 10 powershell and linux
• Add new CentOS 7 templates including provisioning and kickstarter file
• create /iso folder to store pre-downloaded ISO images of linux distribution to save redundant downloads

[mikegreiling]

Does OpsWorks run CentOS now or are you running it to approximate Amazon Linux?

[mikegreiling]

Also, it is my understanding that packer automatically caches *.iso files within a /packer_cache directory, which is already included in the root .gitignore file. Has this been changed to /iso recently, or where is that coming from?

[ljay79]

It is to early to promise a fully tested code hack, but i can confirm it runs on CentOS 7 (under virtualbox on a windows10 host). The goal is/was to approximate it to Amazon Linux, in order to use all this kinda 1:1 for local dev environment and amazon linux production environments.
The AWS OpsWorks cookbooks are sadly not all 100% compatible out of the box with CentOS 7. I upgraded/hacked them as well and have pending PullRequests for such tunings in the AWS repository as well. The AWS OpsWorks Cookbooks support for a vm CentOS 7 guest depends on what cookbook/recipe is used.

The /iso folder might need a improvement yes. For me it was annoying to have the system redownload the ISO's all the time, so i downloaded it onces and made it available for Packer in that folder.
Packer (should) cache it as well yes, its more due the fact i re-installed/reset the entire projects while testing on and on with multiple machines.

[ljay79]

..so i guess the /iso (hack) might be a little redundant if i think about it now.