Date: Wed, 30 May 2012 18:55:20 +0200 From: Witold Baryluk <baryluk@smp.if.uj.edu.pl> To: Lukas Laukamp <lukas@laukamp.me> Cc: freebsd-xen@freebsd.org Subject: Re: FreeBSD Xen Dom0 Support Message-ID: <20120530165520.GI16584@smp.if.uj.edu.pl> In-Reply-To: <4FC618DB.5060901@laukamp.me> References: <4FC3B195.8020007@laukamp.me> <B6F285C4-47B8-429C-896F-DBC32E39F91A@sysconfig.org.uk> <4FC3C83B.503@laukamp.me> <20120528220305.GC16584@smp.if.uj.edu.pl> <4FC3FB04.8050500@laukamp.me> <20120528224815.GE16584@smp.if.uj.edu.pl> <4FC618DB.5060901@laukamp.me>
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On 05-30 14:55, Lukas Laukamp wrote: > Am 29.05.2012 00:48, schrieb Witold Baryluk: > >On 05-29 00:24, Lukas Laukamp wrote: > >>Am 29.05.2012 00:03, schrieb Witold Baryluk: > >>>On 05-28 20:47, Lukas Laukamp wrote: > >>>>Am 28.05.2012 20:02, schrieb Carsten Heesch: > >>>>>Hi Lukas, > >>>>> > >>>>>>[...] I don't know whether there is support for Xen Dom0 on FreeBSD. > >>>>>Unfortunately there isn't. > >>>>> > >>>>>>I read that NetBSD support Xen Dom0 [...] > >>>>>I haven't tried myself, but apparently NetBSD works rather well as Dom0. That has long been on my list of things to test, though :) > >>>>> > >>>>>Not sure if you are aware of it, but in order to run FreeBSD as DomU, you don't need FreeBSD or NetBSD as Dom0. That works just as well on your Debian Dom0. (With FreeBSD's known limitations as DomU, namely memory and architecture depending on PV or HVM virtualisation) > >>>>> > >>>>> > >>>>>Cheers > >>>>>C. > >>>>> > >>>>> > >>>>Hello Carsten, > >>>> > >>>>thanks for your fast answer. That FreeBSD as DomU runs on Linux I > >>>>know. So I only think that it is a bit tricky to build a PV DomU of > >>>>FreeBSD because the kernel must be modified. I wan't to have another > >>>>system like Linux as the host because I think that the BSDs are > >>>>better in the stability and a few other points. I read in the > >>>>english Wikipedia article about Xen that there is support for > >>>>NetBSD, OpenBSD and OpenSolaris > >>>>(http://en.wikipedia.org/wiki/Xen#Host:_Unix-like_systems). > >>>> > >>>BTW. I read yeasterday that Windows Server 2008 with Hyper-V is able to > >>>run XEN PV domU Linux on it. It probably is also able to run other Xen > >>>domU guests, but probably nobody was trying to do so. I do not know > >>>details, but it was what I read about Hyper-V hypervisor on Wikipedia. > >>>In fact it looks like independent implementation of Xen compatible > >>>hypervisor (it uses same hypercall api, but I do not know with which > >>>version of Xen it is compatible) with Windows as dom0. > >>> > >>>Not that anybody would want to run it, but just saying. > >>> > >>Hello Witold, > >> > >>Hyper-V can do that because Microsoft has co-operation contracts > >>with Citrix who is one of the primary maintainers of Xen. So the try > >>to build compatibility between Xen and Hyper-V. Personaly I wouldn't > >>use Hyper-V because it's not that great like for example VMWares > >>vSphere. > >> > >Ah, yes Citrix. This makes sense. > > > > > >>But for the productive working I use Xen and KVM at the moment. And > >>as I started to think to change to BSD I first looked which > >>virtualization technologies are available on BSD. I thought that the > >>best solution would be Xen because KVM don't is available for BSD > >>and other solutions like QEmu, VirtualBox or the BSD Hypervisor > >>BHyVe are very great for testing and home and so I would say the > >>development command and control center but not for server > >>virtualization or other things which provides services which are > >>needed for productive use. > >> > >>When I look at the wikis and read about the support for Xen on other > >>unix like systems I only see NetBSD or Solaris (and it's forks) for > >>a realy good Dom0. > >> > >>So does someone can explain the differences between FreeBSD and > >>NetBSD? I see not so much without looking for the supported hardware > >>platforms. The BSD with the most differences I think is OpenBSD. > >> > >>And the other thing is that I never worked with Solaris, but it > >>seems that they have great Xen support. So I don't know whether it > >>would be a good choice. I think that I will have much to learn to > >>work good with a BSD but I hope it's possible for me. > >> > >I personally would like to switch to FreeBSD domO mainly due to the ZFS > >storage (its snapshots, easier atomic backups and zvol, fast cloning, > >and easier exporting via iSCSI). I know I can do almost all of it using > >LVM, just not so easly and reliabiliy or automatically. > > > >I currently use Debian GNU/Linux, and I'm very happy, espcially due > >package system, but considering there is Debian kfreebsd, I would like > >to make switch in the future when domO will be available. I now use > >kfreebsd (with 9.0 kernel) as domU without bigger issues. > > > >As of NetBSD i have no idea of good distinguishing differences. It is > >more portable than FreeBSD for sure (which its domO support proofs), but > >there is many small differences, including hardware drivers or various > >subsystems scalability performance for examples. I belive there is still > >code exchange between various BSD operating systems due similar > >internals and libearal licensing (especially networking code and > >networking drivers). > > > >I would somehow be carefull with Solaris, as Oracle isn't very > >open-source friendly IMHO (despite its ocfs or btrfs work). I also > >failed to run Solaris on the Xen, but it may be my incompetence. :( > > > > Hey all, > > I answer to this mail because it's related to the discussion in this > thread. As told I have my Debian Dom0s and now I wan't to create a > FreeBSD Xen PV DomU. Does I really need a HVM guest like described > here: http://wiki.sysconfig.org.uk/display/howto/Xen+FreeBSD+8.2+DomU+%28PV%29+--+Step+by+Step+Howto > > I already downloaded the prepared DomU Image but it's version 8.2 > and not 8.3 or 9.0 so could I simply upgrade the guest to 8.3 for > example? > > Because of the thing with kfreebsd on Debian I look into the > repositorys of my AMD64 DomUs but I can only find the FreeBSD kernel > sources. Can I simply compile this kernel with special options to > get a working DomU kernel or do I have to take another way? > > best regards HVM is not needed. I sucesfully installed freebsd 9.0 on Debian squeezy i386 with PV few months ago (and given precise instructions for it). No compilation was involved. It involves getting: - official FreeBSD 8.0 ISO image $ wget ftp://ftp.freebsd.org/pub/FreeBSD/releases/i386/i386/ISO-IMAGES/9.0/FreeBSD-9.0-RELEASE-i386-dvd1.iso - official kfreebsd kernal available in non-kfreebsd Debian repo $ apt-get install kfreebsd-image-xen (available also in http://packages.debian.org/sid/kfreebsd-image-9.0-1-xen) - seting up xen .cfg file for installation [1], and empty disk image [2] given below - using serial console for installation using normal official Freebsd installer So. A config for installation: $ cat kfreebsd9.cfg name = "my-freebsd" kernel = "/boot/kfreebsd-9.0-1-xen.gz" extra = "vfs.root.mountfrom=cd9660:/dev/da1" memrory = 256 disks = [ "file:/home/kfreebsd9-disk1.img,sda,w" ,"file:/home/FreeBSD-9.0-RELEASE-i386-dvd1.iso,sdb,r" ] $ Set up a empty 10GB disk image. $ dd if=/dev/zero of=/home/kfreebsd9-disk1.img bs=1M count=0 skip=10000 Start machine: $ xm-or-xl create kfreebsd.cfg -c Install what you want, then using 'ansi' terminal over this serial line. after install go to shell, and add xen console to /etc/inittab file! Then remember to clearly shutdown. Then change config to this ones: $ cat kfreebsd9.cfg name = "my-freebsd" kernel = "/boot/kfreebsd-9.0-1-xen.gz" extra = "vfs.root.mountfrom=ufs:/dev/da0p2" memrory = 256 disks = [ "file:/home/kfreebsd9-disk1.img,sda,w" ] $ And start again: $ xm-or-xl create kfreebsd.cfg -c Log in and do the rest of setup, like network configuration. I think it is simplest method. For further references: - http://www.mail-archive.com/freebsd-xen@freebsd.org/msg01178.html -- Witold Baryluk
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