QEMU KVM Libvirt(12): Live Migration】的更多相关文章

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…
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…
在openstack中,如果我们启动一个虚拟机,我们会看到非常复杂的参数 qemu-system-x86_64 -enable-kvm -name instance-00000024 -S -machine pc-i440fx-trusty,accel=kvm,usb=off -cpu SandyBridge,+erms,+smep,+fsgsbase,+pdpe1gb,+rdrand,+f16c,+osxsave,+dca,+pcid,+pdcm,+xtpr,+tm2,+est,+smx,+v…
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…
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…
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…
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…
前面讲了QEMU的qcow2格式的internal snapshot和external snapshot,这都是虚拟机文件格式的功能. 这是文件级别的. 还可以是文件系统级别的,比如很多文件系统支持snapshot,如OCFS2 还可以是block级别的,比如LVM支持snapshot 我们这节来分析openstack中各种snapshot的实现. 在Openstack中,Instance的启动大概有两种,一种是从image启动,一种是从bootable volume启动 启动了的instanc…
kvm简介 kvm最初由Quramnet公司开发,2008年被RedHat公司收购.kvm全称基于内核的虚拟机(Kernel-based Virtual Machine),它是Linux的一个内核模块.包括核心虚拟化模块kvm.ko,以及特定CPU的模块kvm-inet.ko或kvm-amd.ko,其实现需要宿主机的CPU支持硬件虚拟化.从Linux内核版本2.6.20开始,kvm模块就已经包含在Linux内核中了.在X86平台下CPU的硬件虚拟化技术有Inetl的VT-X和AMD的AMD-V.…