随笔分类 - virtualization
摘要：External Snapshot managementSymptomAs of at least libvirt 1.1.1, external snapshot support is incomplete. For example, with 1.0.5 or later, an externa...
阅读全文
摘要：http://rwmj.wordpress.com/2010/07/17/virtio-balloon/After someone asked me a question about “balloons” (in the virtualization sense) today, I noticed ...
阅读全文
摘要：AppArmor https://help.ubuntu.com/14.04/serverguide/apparmor.html AppArmor 是一个实施了基于名称强制存取控制的Linux安全模组。AppArmor 界定了单个程序进入一组文件列表的权限并遵循posix 1003.1e 草稿的能力。 默认情况下AppArmor已安装并载入。它使用每个程序的profiles来确定这个程序需要什么文...
阅读全文
摘要：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 1...
阅读全文
摘要：KVM/QEMU hypervisor driverProject LinksDeployment pre-requisitesConnections to QEMU driverDriver security architectureDriver instancesPOSIX users/grou...
阅读全文
摘要：http://www.cloudbase.it/create-windows-openstack-images/We get regularly a lot of requests about how to generate Windows OpenStack images, especially ...
阅读全文
摘要：Volume managersSome Unix systems have snapshot-capable logical volume managers. These implement copy-on-write on entire block devices by copying chang...
阅读全文
摘要：http://kashyapc.com/2011/10/04/snapshotting-with-libvirt-for-qcow2-images/ Libvirt 0.9.6 was recently out. Take a look at 0.9.5 changelog for truckload of features/bugfixes/cleanups(specifically snaps...
阅读全文
摘要：http://kashyapc.com/ Raw image is a blob of data exposed directly in VM as block device, it can't snapshot. qemu-img is able to import data from raw image into qcow2 image, and save it as snapshot Pr...
阅读全文
摘要：KVM Kernel-based Virtual Machine Internals, code and more http://slides.com/braoru/kvm#/ What behind KVM QEMU and KVM architecture overview KVM internals Very small Introduction to Libvirt KVM in 5 s...
阅读全文
摘要：KVM虚拟化技术生态环境介绍 http://xanpeng.github.io/wiki/virt/kvm-virtulization-echosystem-intro.html kvm和qemu/qemu-kvm的关系 qemu vs. qemu-kvm: 从qemu 1.3开始，kvm userspace code就维护在qemu mainline中(git clone https://gi...
阅读全文
摘要：http://www.ilsistemista.net/index.php/virtualization/43-kvm-scalability-and-consolidation-ratio-cache-none-vs-cache-writeback.html?limitstart=0 In the latest ten years, full-virtualization technologie...
阅读全文
摘要：http://www.ilsistemista.net/index.php/virtualization/42-kvm-virtio-paravirtualized-drivers-why-they-matter.html?limitstart=0 As you probably already know, there are basically two different schools in ...
阅读全文
摘要：RHEL6 学习：Write Barriershttp://francs3.blog.163.com/blog/static/405767272012215212890/ Write Barriers 是一种内核机制，可以保证文件系统元数据正确有序地写入持久化存储，哪怕持久化存储掉电的情况也能保证。...
阅读全文
摘要：Barriers, Caches, Filesystemshttp://monolight.cc/2011/06/barriers-caches-filesystems/With the recent proliferation of ext4 as the new “default” Linux ...
阅读全文
摘要：http://lwn.net/Articles/283161/Journaling filesystems come with a big promise: they free system administrators from the need to worry about disk corru...
阅读全文
摘要：Almost one year ago, I checked how different cache settings affected KVM storage subsystem performance. Results were very clear: to obtain good I/O speed, you had to use the write-back or none cache p...
阅读全文
摘要：KVM I/O slowness on RHEL 6 http://www.ilsistemista.net/index.php/virtualization/11-kvm-io-slowness-on-rhel-6.html?limitstart=0 Over one year has passed since my last virtual machine hypervisor compari...
阅读全文
摘要：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,downscri...
阅读全文
摘要：Administrating Virtual Machines with QEMU MonitorWhen QEMU is running, a monitor console is provided for performing interaction with the user. Using t...
阅读全文
