KVM and Centos 6.3 setup checklist for CloudStack 3 and 4

Here is a short checklist to make CloudStack 3/4 work with KVM on CentOS 6.3:

1. check hostname is okay
2. disable selinux (or set it in permissive mode)
3. remove qemu-kvm if installed
4. add EPEL repository
5. adjust /etc/cgconfig.conf file by adding:

group virt {
    cpu

{         cpu.shares = 9216;         }
}

6. update centos
7. make sure primary/secondary storages could be mounted
8. reboot
9. install cloudstack agent
10. configure bridge devices
11. connect host from the management server