118 lines
2.6 KiB
Markdown
118 lines
2.6 KiB
Markdown
[[!meta title="Linux Virtual Machine Overview"]]
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This document is ***WORK IN PROGRESS***
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## Introduction
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This article tries to summarise Linux Virtual Machine
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methods and is in its early stage. It does not focus
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on different types of hypervisors, but more on the
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issues and features you get with each hypervisor.
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### Host Kernel
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Some supervisors need their own (modified Linux) kernel
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to operate, whereas others work with any Linux kernel.
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Though some of them again need some configurations
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to be turned on in the stock kernel.
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### Management
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Most hypervisors contain some minor collection of utilities
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to manage virtual machines. Some libraries / frameworks
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try to integrate those utilities, to abstract the different
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implementations.
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Typical issues are:
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* Autostart machines on startup / autostop on shutdown
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* Creation of new VMs / including template handling
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* Manual start/stop of VMs
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* Listing of running / existing VMs
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## Hypervisors
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[[!table data="""
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Name | Host Kernel
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[QEMU](http://wiki.qemu.org/) | Original
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[KVM](http://www.linux-kvm.org/) | Original w/KVM
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[Lguest](http://lguest.ozlabs.org/) | Original w/Lguest
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[Linux Containers](http://lxc.sourceforge.net/) | Original w/Containers
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[Linux VServer](http://linux-vserver.org) | Own
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[User Mode Linux](http://user-mode-linux.sourceforge.net/) | Original
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[OpenVZ](http://wiki.openvz.org/Main_Page) | Own
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[Virtualbox](http://www.virtualbox.org/) | Original+Modules
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[VMWare](http://www.vmware.com/) | Original+Modules / Own
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[Xen](http://www.xen.org/) | Own
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"""]]
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## Libraries / Frameworks
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[[!table data="""
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Name | Hints
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Ganetti |
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Libvirt |
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"""]]
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## Raw import of notes
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The following notes I made some months ago, which will
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be the basis for this article.
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Try all of them and handle them via creature!
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Installation
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------------
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From host like lxc.
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From "inside" like KVM/QEMU/VMWare.
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status
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------
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eth: ip addresses / mac / dhcp
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### lxc
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Not completly isolated. Linux only. Many changes to the guest os.
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Some scripts existent (lxc-debian, lxc-fedora). The latter does
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not work on debian.
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lxc-debian mit cache (schlau)
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no real hypervisor existent.
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mac / ipv4 management missing => creature
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adjust init. change dev. do not run udev (why?)
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Root open in the filesystem. Nice. Quota?
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Ressources are shared, if nothing else is specified.
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=> network = all!
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First installation - than virtualisation!
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kvm
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---
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mac address,
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ip address => dhcp???
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Bootstrapping
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-------------
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how tos
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different methods
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which way for which vm-type
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Network
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-------
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Always dhcp? Either on the vm-host or external.
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Reason: Easy to configure. Scales dynamically.
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How to handle bridges etc.? Independent of the os?
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Reuse OS
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[[!tag net unix]]
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