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What is the minimum amount of diskspace a CentOS system, plus the java virtual machine, needs to be installed?

Desktop interface is not needed.

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What exactly are you trying to accomplish with that system? – Nils Nov 19 '11 at 21:31
install many VMS to test some software – Mascarpone Nov 19 '11 at 22:59
up vote 2 down vote accepted

4 GB should be sufficient for /. Add another 4 GB for /var. So in sum 8 GB should be enough (I use no swapspace).

That`s what I use as standard for our virtual CentOS 5 machines. They normally never hit the 80% mark in that setup.

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If you use Fedora's AOS kickstart then you can get it down to under 500MB or so.

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