more cleanups to the vm document
Signed-off-by: Nico Schottelius <nico@kr.ethz.ch>
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Nico Schottelius
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1 changed files with 59 additions and 71 deletions
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@ -16,6 +16,38 @@ 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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Though some of them again need some configurations
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to be turned on in the stock kernel.
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to be turned on in the stock kernel.
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### VM Installation
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Depending on the hypervisor, there are different requirements
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and methods for the installation:
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* Installation can be done within the VM for completly isolated machines
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* Installation must be done outside / on the host for systems without own kernel
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Some hypervisors can boot from the network, whereas others just
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create a very lightweight isolation and boot an installed system
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only.
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### Guest OS changes
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Some hypervisors require changes to the virtual machines, to be able
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to run successfully. Others allow a original OS version to be
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installed.
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### Network configuration
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Whether the VM is attached to a bridge, a tun/tap device, treated
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as a normal process, there may be a lot of different configurations.
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Furthermore, firewall (masquerade/nat) configurations may be necessary.
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Additionally, some of the hypervisors support dynamic allocation
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of mac or even ip addresses.
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### Templates
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Some hypervisors support reusage of installations.
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### Management
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### Management
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Most hypervisors contain some minor collection of utilities
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Most hypervisors contain some minor collection of utilities
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@ -30,22 +62,38 @@ Typical issues are:
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* Manual start/stop of VMs
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* Manual start/stop of VMs
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* Listing of running / existing VMs
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* Listing of running / existing VMs
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### Automated usage
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Especially interesting for a sysadmin is, how easy a system can
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be automated, which steps need to be taken to get a new image
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or copy of an existing one. This aspect is one focus of this
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document.
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## Hypervisors
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## Hypervisors
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[[!table data="""
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[[!table data="""
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Name | Host Kernel
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Name | Host Kernel | Guest OS changes
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[QEMU](http://wiki.qemu.org/) | Original
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[QEMU](http://wiki.qemu.org/) | Original | no
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[KVM](http://www.linux-kvm.org/) | Original w/KVM
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[KVM](http://www.linux-kvm.org/) | Original w/KVM | no
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[Lguest](http://lguest.ozlabs.org/) | Original w/Lguest
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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 Containers](http://lxc.sourceforge.net/) | Original w/Containers | yes
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[Linux VServer](http://linux-vserver.org) | Own
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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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[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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[OpenVZ](http://wiki.openvz.org/Main_Page) | Own | ?
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[Virtualbox](http://www.virtualbox.org/) | Original+Modules
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[Virtualbox](http://www.virtualbox.org/) | Original+Modules | no
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[VMWare](http://www.vmware.com/) | Original+Modules / Own
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[VMWare](http://www.vmware.com/) | Original+Modules / Own | no
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[Xen](http://www.xen.org/) | Own
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[Xen](http://www.xen.org/) | Own | ?
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"""]]
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"""]]
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### lxc
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Some hints on lxc:
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* Helper scripts existent (lxc-debian, lxc-fedora, ...)
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* adjust init. change dev. do not run udev (why?)
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* Root open in the filesystem
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* No network specified = all from host accessible!
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## Libraries / Frameworks
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## Libraries / Frameworks
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[[!table data="""
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[[!table data="""
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@ -54,64 +102,4 @@ Ganetti |
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Libvirt |
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Libvirt |
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"""]]
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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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[[!tag net unix]]
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