Virtual machine manager error: no connection driver available for qemu:///system on CentOS 7

I’m trying to find a nice full-sim environment on my dying CentOS 7.X system. It means not a docker neither a LXC solution but a full OS with IP and so on. As similar as the real thing but running on CentOS 7. I have a clean machine, and I remember qemu as the tool that does everything I want. So I install it, start the service, and call the GUI. Like this:

yum install qemu-kvm qemu-img virt-manager libvirt-daemon
systemctl start libvirtd
virt-manager &

The GUI pops up but it gives me the error above. That I solve in one of the ways described in this post. I have updated and enable the service without luck. So I go for missing packages.

yum -y install qemu-kvm qemu-img virt-manager \
libvirt libvirt-python python-virtinst \
libvirt-client virt-install virt-viewer

After that, no need to reboot, I get my GUI and I can start playing with VMs. I will report you my findings, if any 🧐. BONUS: another post about a similar issue.

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