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KVM (for Kernel-based Virtual Machine) is a complete virtualization solution for Linux on x86 hardware containing virtualization extensions (Intel VT or AMD-V). It consists of a loadable kernel module, kvm.ko, which provides the basic virtualization infrastructure and a processor-specific module, kvm-intel.ko or kvm-amd.ko.
Using KVM, one can run multiple virtual machines running unmodified Linux or Windows images. Each virtual machine has private virtualized hardware: a network card, a disk, a graphics card, etc.
KVM is open source software. The kernel component of KVM is included in mainline Linux, starting with version 2.6.20. The userspace component of KVM is included in the QEMU mainline, starting with version 1.3.
How KVM works:
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KVM converts Linux into a type 1 (bare metal) hypervisor. All hypervisors need certain operating system-level components, such as a memory manager, process scheduler, input/output (I/O) stack, device drivers, security, a network stack, etc., to run virtual machines. KVM has all these components because it is part of the Linux kernel. Each virtual machine is implemented as a standard Linux process, scheduled by the standard Linux scheduler, with dedicated virtual hardware such as a network card, graphics card, processor(s), memory, and disks.
Install KVM in CentOS 7:
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# defineforce 0
# uname -a
# cat /etc/CentOS-release
# grep -E 'svmvmx' /proc/cpuinfo
# yum repolist
watch this video to configure it in RHEL 7:
https://youtu.be/-N09WSCNcso
# yum install -y qemu-kvm libvirt libvirt-python libguestfs-tools virt-install
# systemctl starts libvirtd
# systemctl libvirtd status
#ifconfig
# vim /etc/sysconfig/network-scripts/ifcfg-ens33
#IPADDR
#MASQUENET
#BRIDGE
BRIDGEvirbr0
# cp -p /etc/sysconfig/network-scripts/ifcfg-ens033 /etc/sysconfig/network-scripts/ifcfg-virbr0
# vim /etc/sysconfig/network-scripts/ifcfg-virbr0
TYPEBRIDGE
IPADDR
NETWORK MASK
BRIDGE
DEVICEvirbr0
# ll /usr/lib/sysctl.d/60-libvirtd.conf
# rpm -qf /usr/lib/sysctl.d/60-libvirtd.conf
# vim /usr/lib/sysctl.d/60-libvirtd.conf
net.ipv4.ip_forward 1
# /sbin/sysctl -w /usr/lib/sysctl.d/60-libvirtd.conf
# /sbin/sysctl -p /usr/lib/sysctl.d/60-libvirtd.conf
# ifconfig virbr0
# virsh net-edit by default
192.168.1.140
DHCP range 192.168.1.200 192.168.1.254
# vim /etc/sysconfig/network-scripts/route-virbr0
192.168.1.0/24 via 192.168.1.140 dev virbr0
# initialization 6
# systemctl libvirtd status
# ifconfig -a
# osinfo-query os more
# osinfo-query os grep -i centos
#df-hT
# ll /tmp/CentOS-7-x86_64-DVD-1708.iso
# chmod 775 /tmp/CentOS-7-x86_64-DVD-1708.iso
# ll /kvm
# virt-install –name KVMac –description /"CENTOS7 for KVMac/" –os-typeLinux –os-variantcentos7.0 –ram1024 –vcpus1 –disk path/kvm/KVMac.img,busvirtio,size10 –graphics none –console pty,target_typeserial –location /tmp/CentOS-7-x86_64-DVD-1708.iso –network bridge:virbr0 –extra-args consolettyS0
# virsh list –all
# virsh dominfo KVMac
# virsh shutdown KVMac
# virsh KVMac console
# virsh KVMac console
# virsh list –all
# virsh starts KVMac
# virsh KVMac console
# virsh list
# virsh list –all
# virt-clone –connect qemu:///system –original KVMac –name vm3 -f /kvm/KVMac2.img
# virsh list –all
# virsh starts KVMac2
# virsh KVMac2 console
#ifconfig
#nslookup 8.8.8.8
# netstat -n°
You have finished.
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