Note: This is an RHCSA 7 exam objective.
Download the CentOS 7 distribution (see Software requirements) and install it with default configuration.
Choose a domain name (example.com strongly recommended), a host name (for example master.example.com) and an IP address compatible with your network environment (here 192.168.1.5, gateway is supposed to be 192.168.1.1).
Update your system:
# yum update
Install the KVM packages:
# yum group install "Virtualization Host" # yum install -y virt-install virt-top libguestfs-tools
Note: The libguestfs-tools brings the very useful virt-sparsify command with it. When space is sparse, this command is invaluable: it limits the virtual machine footprint to the space used only.
Start the libvirtd service:
# systemctl start libvirtd
Activate the Chronyd/NTP service at boot and start it:
# systemctl enable chronyd && systemctl start chronyd
Check the installation:
# virt-host-validate QEMU: Checking for hardware virtualization : PASS QEMU: Checking for device /dev/kvm : PASS QEMU: Checking for device /dev/vhost-net : PASS QEMU: Checking for device /dev/net/tun : PASS LXC: Checking for Linux >= 2.6.26 : PASS
To get optimal performances, activate the virtual-host tuned profile:
# tuned-adm profile virtual-host
You have just installed a KVM host but this installation will only last for 1 year. After this period and a reboot, your KVM certificate will expire. Look at this tutorial about KVM certificate expiration to set up an installation for more than 1 year.