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This setting works on CentOS 6 / RHEL 6 but does nothing, as "cpu" cgroup is not mounted. On CentOS 7 / RHEL 7 systemd does mount cgroups and "cpu" is co-mounted with "cpuacc". Hence, if we specify "cpu" then this results in an error because it can only use them both, or none. By removing the setting, we rely on the default of qemu, which is: cgroup_controllers = ["cpu", "devices", "memory", "blkio", "cpuacct", "net_cls"] Only if they are really mounted, they will be used. So, this will work on both version 6 and 7. The 'fix script' didn't work well, as after a reboot you'd still have qemu throwing errors. Now we can handle the co-mountedcgroups.