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I'd really like to find a coursera/udacity/... course or any tutorial on basic devops that includes the use of vagrant/packer chef/puppet/ansible....

Not terribly in depth, but covers Vagrant and Puppet.

jerrya: In addition to that, you should check out my comment [1] on that thread.

I'm wondering, how do you replace an old image with a new one. Do you just start a new VM and terminate the old one ?

Not sure I understand the question but, a new image is generated every time you run packer build.

I really don't see why ruby is such a pain for ops.. rvm is dead simple to get up and running, is it not?

Some thoughts about Packer