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Ok, finally working like a charm

Answer to 1)

Using virt-manager GUI kept trace of my created VM and I'm able to start it again. Still interested in the way to do it via CLI tools though.

Answer to 2)

It was just a CentOS installation configuration misunderstanding, not related to libvirt (which had already done its job, see libvirt installation instructions about network, I don't remember where I got them but there are pretty straightforward for basic config).

I just missed the "Configure network" button on installation screens. ( Window size problem on my side ). CentOS doesn't auto-configurate its network devices anymore apparently. Or config manually after install, see for exemple : wiki.centos.org (slash) FAQ/CentOS6#head-b67e85d98f0e9f1b599358105c551632c6ff7c90