How to create an ISO Image of my perosnal-tweaked Fedora20 GNOME?

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You can make a bootable version of the system - as in - one that will contain the same packages that you've installed. However, the user configurations that you've made will need to first be converted into a deployable way. It'll be much easier to :

• Install Fedora on his system
• Copy over the user config files

This should work but you need to be careful about minor changes like different usernames.

Another solution is to use a kickstart - Even in this, the user settings need to be deployed somehow - it isn't really straight forward.

In general, it is quite difficult to make a bootable iso of an already installed system. It's possible theoretically but I've never seen anyone do it - since it's less work to just install fresh and set up.

When I set up my systems, I generally have a couple of bash scripts that set up the user for me. However, I don't bother to tweak the user settings - themes etc. - that much. I generally only need a certain set of packages which is easy to install. You can get the current set of installed packages using the show-installed command available in the yum-utils package. Try show-installed --help for more details.