libvirt is a library that provides a common API for managing popular virtualization solutions, among them KVM and Xen. 使用virt-install创建image qemu-img create -f qcow2 /tmp/centos5.8.img 10G virt-install --virt-type qemu --name centos-5.8 --ram 2048 --…

When managing a VM Guest on the VM Host Server itself, it is possible to access the complete file system of the VM Host Server in order to attach or create virtual hard disks or to attach existing images to the VM Guest. However, this is not possible…

学习 KVM 的系列文章: (1)介绍和安装 (2)CPU 和 内存虚拟化 (3)I/O QEMU 全虚拟化和准虚拟化(Para-virtulizaiton) (4)I/O PCI/PCIe设备直接分配和 SR-IOV (5)libvirt 介绍 (6)Nova 通过 libvirt 管理 QEMU/KVM 虚机 (7)快照 (snapshot) (8)迁移 (migration) 1. QEMU/KVM 迁移的概念 迁移(migration)包括系统整体的迁移和某个工作负载的迁移.系统整理迁移…

Overcommits KVM allows for both memory and disk space overcommit. However, hard errors resulting from exceeding available resources will result in guest failures. CPU overcommit is also supported but carries performance implications. Time Synchroniza…

RAW raw是默认的格式,格式简单,容易转换为其他的格式.需要文件系统的支持才能支持sparse file 创建image # qemu-img create -f raw flat.img 10GFormatting 'flat.img', fmt=raw size=10737418240 如果我们ls则看到 ls -lh flat.img -rw-r--r-- 1 root root 10G Jun 30 22:27 flat.img 但是并不真正占用10G # du -h flat.im…

由于KVM的架构为 Libvirt –> qemu –> KVM 所以对于live migration有两种方式,一种是qemu + KVM自己的方式,一种是libvirt的方式,当然libvirt也是基于qemu+kvm的方式 qemu + KVM自己的方式为使用monitor KVM Migration KVM currently supports savevm/loadvm and offline or live migration Migration commands are give…

BACKGROUND Virtualization technology enables a single host computer running a virtual machine monitor ("VMM") to present multiple abstractions and/or views of the host, such that the underlying hardware of the host appears as one or more indepen…

Administrating Virtual Machines with QEMU Monitor When QEMU is running, a monitor console is provided for performing interaction with the user. Using the commands available in the monitor console, it is possible to inspect the running operating syste…

访问Hard Drive 使用-hda –hdb qemu-system-x86_64 -enable-kvm -name ubuntutest  -m 2048 -hda ubuntutest.img -hdb ubuntutest1.img -boot c -vnc :19 -net nic,model=virtio -net tap,ifname=tap0,script=no,downscript=no 访问CD-ROM/DVD-ROM 使用-cdrom 如果想直接挂载Host机器上的CD…

安装 对虚拟化的支持通常在BIOS中是禁掉的,必须开启才可以. 对于Intel CPU,我们可以通过下面的命令查看是否支持虚拟化. # grep "vmx" /proc/cpuinfo flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdp…