KVM Virtualization 1

The five main components of a computer:

Arithmetic, controller, memory, input, output

Virtualization is virtual for CPU, memory, disk, network, IO

The virtual CPU is in the form of a Time Shard, which allows the CPU to run multiple processes

The memory is spatially multiplexed,

MMU Memory Management Unit: the memory that each process has will eventually be mapped to physical,

Memory divides physical memory space into multiple spaces, each called a paging, for process use

Virtual network card: Time series multiplexing, Nic queue,

Virtualization Classification:

1 hypervisor create additional virtual machines on top of it (Xen is responsible for managing CPU, memory), IO devices have the first virtual machine management Dom0, other virtual machines become domu,

2 Installing virtualization software on the operating system, and install virtualization VMware on top of it

Virtualization has:

Host virtualization: KVM, VirtualBox, Xen

Container virtualization: Lxc OpenVZ Libcontainer, just isolate the user space virtual out of the user space, sharing the same core, performance is better but the isolation type is not very good,

Simulator: QEMU

The principle of KVM:

KVM is composed of two components:

1 Kernel-space Kvm.ko module, which works in the kernel, will

2 QEMU-KVM: Program tools for user space

Libvirt: hypervisor for interactive c/s architecture

Virt-manager: Graphical hypervisor enables creation of virtual machines

KVM requires hardware CPU support virtualization: GREP-E-i "(SVM|VMX)"/proc/cpuinfo with support for hardware virtualization

Modinfo KVM--------------Command View KVM module

Modprobe KVM--------------Load KVM Module

This is a KVM directory at/Dev and the import is successful, and now the system is virtualized.

Start loading applications: Yum install Libvirt LIBVIRT-DAEMON-KVM Virt-manager

Systemctl Start Libvirtd.service Startup

Create a physical bridge, you can ssh through the physical bridge to manage, create a virtual machine

Virsh Iface-bridge eno33 Br0

Solve

Restart NIC: systemctl restart Network.service

To create a virtual machine based on this bridge device

Ssh-x [email protected]

# Virt-manager & Start Graphical management interface

KVM Virtualization 1