ArchLinux:KVM: Difference between revisions
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This is a tutorial on how to setup KVMs on Arch Linux using Ansible and vagrant-libvirt with QEMU as a back-end. | This is a tutorial on how to setup KVMs on Arch Linux using Ansible and vagrant-libvirt with QEMU as a back-end. | ||
{{Note|This tutorial is meant as a supplement to my [[ArchLinux:OVH|OVH: Custom Installation]] tutorial}} | {{Note|This tutorial is meant as a supplement to my [[ArchLinux:OVH|OVH: Custom Installation]] tutorial}} | ||
= {{Icon24|sitemap}} Installation = | |||
Before getting started there are a few packages that will be needed to set all of this up. | Before getting started there are a few packages that will be needed to set all of this up. | ||
{{Console|1=pacaur -S qemu-headless qemu-headless-arch-extra vagrant}} | {{Console|1=pacaur -S qemu-headless qemu-headless-arch-extra vagrant}} | ||
== {{Icon|notebook}} Hugepages == | |||
Enabling hugepages can improve the performance of virtual machines. First add an entry to the fstab, make sure to first check what the group id of the group {{mono|kvm}} is. | |||
{{Console|1=grep kvm /etc/group|2=sudoedit /etc/fstab}}<br/> | |||
{{Console|title=/etc/fstab|prompt=false|1=hugetlbfs /dev/hugepages hugetlbfs mode=1770,gid=999 0 0}} | |||
Instead of rebooting, remount instead. | |||
{{Console|1=sudo umount /dev/hugepages|2=mount /dev/hugepages}} | |||
This can then be verified. | |||
{{Console|1=sudo mount {{!}} grep huge|2=ls -FalG /dev/ {{!}} grep huge}} | |||
Now to set the number of hugepages to use. For this one has to do a bit of math, for each gigabyte of the system RAM that you want to use for VMs you divide the size in megabytes by two. | |||
{{Note|On my setup I will dedicated 12GB out of the 16GB of system RAM to VMs. This means {{mono|(12 * 1024) / 2}} or {{mono|6144}}}} | |||
Set the number of hugepages. | |||
{{Console|1=echo 6144 {{!}} sudo tee /proc/sys/vm/nr_hugepages}} | |||
Also set this permanently by adding a file to {{mono|/etc/sysctl.d}}. | |||
{{Console|title=/etc/sysctl.d/40-hugepages.conf|prompt=false|1=vm.nr_hugepages = 6144}} | |||
= {{Icon24|book-brown}} References = | = {{Icon24|book-brown}} References = | ||
Revision as of 15:00, 6 August 2017
Back to Category:Arch Linux
Introduction
IntroductionThis is a tutorial on how to setup KVMs on Arch Linux using Ansible and vagrant-libvirt with QEMU as a back-end.
 | This tutorial is meant as a supplement to my OVH: Custom Installation tutorial |
Installation
Before getting started there are a few packages that will be needed to set all of this up.
| # pacaur -S qemu-headless qemu-headless-arch-extra vagrant |
Hugepages
HugepagesEnabling hugepages can improve the performance of virtual machines. First add an entry to the fstab, make sure to first check what the group id of the group kvm is.
| # grep kvm /etc/group # sudoedit /etc/fstab |
filename: /etc/fstab
| hugetlbfs /dev/hugepages hugetlbfs mode=1770,gid=999 0 0 |
Instead of rebooting, remount instead.
| # sudo umount /dev/hugepages # mount /dev/hugepages |
This can then be verified.
| # sudo mount | grep huge # ls -FalG /dev/ | grep huge |
Now to set the number of hugepages to use. For this one has to do a bit of math, for each gigabyte of the system RAM that you want to use for VMs you divide the size in megabytes by two.
| On my setup I will dedicated 12GB out of the 16GB of system RAM to VMs. This means (12 * 1024) / 2 or 6144 |
Set the number of hugepages.
| # echo 6144 | sudo tee /proc/sys/vm/nr_hugepages |
Also set this permanently by adding a file to /etc/sysctl.d.
filename: /etc/sysctl.d/40-hugepages.conf
| vm.nr_hugepages = 6144 |
References
