Virtual Infrastructure

Virtual Infrastructure: kvm, uvb + libvirt Bryan McLellan http://loftninjas.org btm@loftninjas.org Senior Systems Administrator Widemile

Widemile is awesome I work there, and thus the world is a better place for all of humanity.

What I got for “free” •Identical Blades •Running non identical Debian installs (etch/sid, i386/amd64) •Running different versions of vmware-server • OS, software, installed by hand • Configure using notes in an outlook public folder •Host database tracked with DNS vm04-something.test.widemile.com

Problems • Lack of Homogeneity • Monkey configuration sucks • Documentation offensive http://www.flickr.com/photos/annebuzz/2666654754/

What I did • Lack of Homogeneity – debian pxe install with preseeds • Monkey configuration sucks – puppify (configuration management) – capistrano (ruby scripting over ssh) – iclassify (node classification) • Documentation offensive – Configuration management is self documenting – Wikify the notes

We can always do better http://www.flickr.com/photos/jpasden/67513019/

What upset me (nobody else cares) • PXE installs take soooooo long • Backporting too many packages to debian • Interacting with VMware programmatically too much work. • VMware UIs cost $$ • Dreams: cpu/ram hotplug, live migration

How I Learned to Stop Worrying and Love the Bomb • PXE installs take soooooo long – deb-bootstrap with ubuntu-vm-builder (2.5min) • Backporting too many packages to debian – switch to Ubuntu! • Interacting with VMware programmatically too much work. – libvirt is much easier and cleaner • VMware UIs cost $$ – Libvirt is free • Dreams: cpu/ram hotplug, live migration – Word on the street is that kvm + libvirt support these – I don’t think they’re there yet though.

libvirt – virtualization API Started at Redhat ‘s Emerging Technology Group Was Xen focused, but Redhat recently bought Qumranet, makers of KVM Ubuntu/Canonical picked KVM as virtualization platform of choice libvirt doesn’t really support all that Provides CLI management (virsh) Provides GUI management (virt-manager)

virt-manager

ubuntu-vm-builder Bash script wrapper for deb-bootstrap + qemu apt-get install ubuntu-vm-builder capistrano script: vmware: 102 lines uvb: 12 lines ubuntu-vm-builder kvm hardy --addpkg openssh-server -d /srv/kvm/#{hostname} --domain #{domain} --hostname #{hostname} --mem #{memory} --mirror http://ubuntu.widemile.com/ubuntu --libvirt qemu:///system --bridge #{eth0}

ubuntu-vm-builder Bash script wrapper for deb-bootstrap + qemu apt-get install ubuntu-vm-builder capistrano script: vmware: 102 lines uvb: 12 lines Not a lot of enterprise features yet ubuntu-vm-builder kvm Bridging vs NAT hardy --addpkg openssh-server / creates user Root password -d /srv/kvm/#{hostname} --domain #{domain} --hostname #{hostname} --mem #{memory} --mirror http://ubuntu.widemile.com/ubuntu --libvirt qemu:///system --bridge #{eth0}

kvm The cool hypervisor on the block (ubuntu, redhat) • Kernel modifications are mainlined (unlike xen) • Super fast / lightweight (feel the wind in your hair) • Growing fast • class kvm { case $lsbdistid { quot;Ubuntuquot;: { # Only Ubuntu releases are new enough for this package { quot;kvmquot;: ensure => present; quot;libvirt-binquot;: ensure => present; quot;ubuntu-vm-builderquot;: ensure => latest; }

file { quot;/srv/kvmquot;: ensure => directory, group => admins, mode => 0775, } # Permissions required for remote access # Puppet doesn't support managing the libvirtd group members through the group type file { quot;/var/run/libvirt/libvirt-sockquot;: group => admins, require => Service[quot;libvirt-binquot;]; quot;/var/run/libvirt/libvirt-sock-roquot;: group => admins, require => Service[quot;libvirt-binquot;]; }

service { quot;libvirt-binquot;: ensure => running, hasstatus => true, require => Package[quot;libvirt-binquot;], } # required by u-v-b exec { quot;devmapper-autoloadquot;: command => quot;/bin/echo dm_mod >> /etc/modulesquot;, onlyif => quot;/usr/bin/test `grep -c '^dm_mod' /etc/modules` -lt 1quot;, } exec { quot;devmapper-loadquot;: command => quot;/sbin/modprobe dm_modquot;, onlyif => quot;/usr/bin/test `/bin/lsmod | grep -c '^dm_mod'` -lt 1quot;, } realize Group[quot;libvirtdquot;] } } }

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Virtual Infrastructure

by Bryan McLellan on Jan 26, 2009

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