Kernel-based Virtual Machine (KVM) is virtualization software for CentOS or RHEL 7. KVM turn your server into a hypervisor. Let's see how to setup and manage a virtualized environment with KVM in CentOS 7 or RHEL 7.
Run the following command to test if CPU Support Intel VT and AMD-V Virtualization tech:
$ lscpu | grep Virtualization
Virtualization: VT-x
Follow installation steps of KVM on CentOS 7/RHEL 7 headless server
Step 1: Install KVM
Type the following yum command:
# yum install qemu-kvm libvirt libvirt-python libguestfs-tools virt-install
Start the libvirtd service:
# systemctl enable libvirtd
# systemctl start libvirtd
Step 2: Verify KVM installation
Make sure KVM module loaded using lsmod command and grep command:
# lsmod | grep -i kvm
Step 3: Configure bridged networking
This guide shows you how to manage the Network Bridge for KVM in Virtualizor.
Virtualizor will create a viifbr0 bridge.
viifbr0 assumes eth0 as the Network Device and detects the IP, Netmask, GATEWAY from :
/etc/sysconfig/network-scripts/ifcfg-eth0
In the event you have a network device (network interface) other thatn eth0, e.g. eth1, then you can configure Virtualizor to use eth1 as the Network interface to create the bridge.
Making the bridge permanent
You can make the bridge a permanent one so that whenever the OS is started, it will start with the bridge as soon as the network is created.
This guide presumes the network interface is eth0 and OS is CentOS.
Backup ifcfg-eth0
The contents of /etc/sysconfig/network-scripts/ifcfg-eth0 will look something like the following :
root# cat /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=static
TYPE=Ethernet
HWADDR=00:25:90:98:35:90
IPADDR=10.0.0.93
NETMASK=255.255.255.0
GATEWAY=10.0.0.1
IPV6INIT=yes
IPV6ADDR=2607:f0d0:1002:0011:0000:0000:0000:0002
IPV6_DEFAULTGW=2607:f0d0:1002:0011:0000:0000:0000:0001
ONBOOT=yes Make a copy of it :
root# cp /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-eth0.bak Create the Bridge File
root# vi /etc/sysconfig/network-scripts/ifcfg-viifbr0You will need to copy some parts of ifcfg-eth0 to ifcfg-viifbr0 :
DEVICE=viifbr0
TYPE=Bridge
BOOTPROTO=static
IPADDR=10.0.0.93
NETMASK=255.255.255.0
GATEWAY=10.0.0.1
ONBOOT=yes
IPV6INIT=yes
IPV6ADDR=2607:f0d0:1002:0011:0000:0000:0000:0002
IPV6_DEFAULTGW=2607:f0d0:1002:0011:0000:0000:0000:0001Now save the file.
Edit the ifcfg-eth0 File
root# vi /etc/sysconfig/network-scripts/ifcfg-eth0 It should look like the following :
DEVICE=eth0
HWADDR=00:25:90:98:35:90
IPV6INIT=yes
ONBOOT=yes
BRIDGE=viifbr0 Make sure to add correct HWADDR you can use ifconfig -a to find the mac address.
If nott using ipv6 then change it to IPV6INIT=no
Restart Network
We are almost setup now. Just make sure everything is correct before you restart the network. After that restart the network :
root# service network restart
