virt April 2009

virt@lists.fedoraproject.org

33 participants
72 discussions

Schroedinger's VM
by Jerry James 24 Apr '09

24 Apr '09

I'm still a virtualization in Fedora newbie, so forgive me if this is a stupid question. Today I started a kernel compile going in a qemu-kvm virtual machine on one desktop, switched to another desktop, then left for lunch. When I got back, I switched back to the original desktop to see how the compile had gone. It was still going. I ran top, which showed a short-term load of over 4 and a long-term load of near zero, along with 3 cc1 processes near the top of the list. As I sat there puzzling over what had happened, the compile finished. Other compiles have finished in only a few minutes. That near-zero load makes me suspect that the VM simply stopped doing anything while I was gone. I've done a couple of more tests now and have seen the same thing. I can start a download going, switch to another desktop, wait for awhile, then switch back. The download has progressed only a short amount past when I switched away from that desktop, and (apparently) abruptly resumes when I switch back to the desktop containing the VM window. Is this expected? Do KVM-based VMs have to be looked at to do anything? If so, is there an option somewhere along the lines of RunEvenWhenIAmNotLookingAtYou=true? -- Jerry James http://loganjerry.googlepages.com/

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guestfish, libguestfs, ext4 and bad perms on /dev/kvm
by Robert P. J. Day 23 Apr '09

23 Apr '09

(apologies if you've already seen this, my SMTP was a little confused this morning when i sent it initially.) yesterday, in my ongoing quest to turn my brain to yogurt, i was playing with richard jones' guestfish and libguestfs, and tried to mount the root filesystem from the disk image that's now sitting in my home directory so i can get at it without needing root permissions. $ guestfish > <fs> add f1164.img > <fs> run ... wait wait wait ... > <fs> mount /dev/f1164guest/lv_root / libguestfs: error: mount: /dev/f1164guest/lv_root on /: mount: unknown filesystem type 'ext4' i mentioned this off-line to richard, who said he was just getting a newer version of the libguestfs packages together, so i just upgraded to 1.0,6 and: $ guestfish > <fs> run open /dev/kvm: Permission denied Could not initialize KVM, will disable KVM support qemu: loading initrd (0x13acad0 bytes) at 0x0000000016c43000 > <fs> pvs /dev/sda2 > <fs> lvs /dev/f1164guest/home /dev/f1164guest/lv_root /dev/f1164guest/lv_swap > <fs> mount /dev/f1164guest/lv_root / > <fs> mounts /dev/mapper/f1164guest-lv_root > <fs> in short, ext4 filesystem support now appears to work, but there's still the issue (perhaps addressed earlier) that non-root users don't have access to KVM support but, from the perspective of libguestfs, does that really matter? anyway, ext4 support is in there so things are working, at least to the extent that i've tested it. rday -- p.s. i could have sworn i didn't get that /dev/kvm perms error yesterday. did something about that change since version 1.0.4? $ ls -l /dev/kvm crw-rw---- 1 root root 10, 232 2009-04-22 05:16 /dev/kvm $ ======================================================================== Robert P. J. Day Waterloo, Ontario, CANADA Linux Consulting, Training and Annoying Kernel Pedantry. Web page: http://crashcourse.ca Linked In: http://www.linkedin.com/in/rpjday Twitter: http://twitter.com/rpjday ========================================================================

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Re: some minor typoes in "man guestfish"
by Richard W.M. Jones 23 Apr '09

23 Apr '09

On Wed, Apr 22, 2009 at 08:43:58PM -0400, Robert P. J. Day wrote: > > i can't see posting this to the list, being as pedantic as it is. > the man page for "guestfish" has a number of references to guestfish > commands where a hyphen is incorrectly used instead of an underscore. > just search for the strings in that man page: > > aug_init > aug_set > aug_* > aug_close > aug_load > aug_match > blockdev_getsz > blockdev_getss > blockdev_getsize64 > is_file > is_dir > lvs_full > pvs_full > tgz_in > tgz_out > tar_in > tar_out > vgs_full This is now fixed in git. Rich. -- Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones New in Fedora 11: Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 70 libraries supprt'd http://fedoraproject.org/wiki/MinGW http://www.annexia.org/fedora_mingw

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Windows Compile of Virt-Viewer
by Robert Dunkley 23 Apr '09

23 Apr '09

Does anyone have a Windows compile they could send me? I'm having some problems with Vencrypt. Thanks, Rob The SAQ Group Registered Office: 18 Chapel Street, Petersfield, Hampshire GU32 3DZ SAQ is the trading name of SEMTEC Limited. Registered in England & Wales Company Number: 06481952 http://www.saqnet.co.uk AS29219 SAQ Group Delivers high quality, honestly priced communication and I.T. services to UK Business. Broadband : Domains : Email : Hosting : CoLo : Servers : Racks : Transit : Backups : Managed Networks : Remote Support. ISPA Member Find us in http://www.thebestof.co.uk/petersfield

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[ANNOUNCE] libguestfs 1.0.10
by Richard W.M. Jones 23 Apr '09

23 Apr '09

I'm currently uploading libguestfs 1.0.10 to the site. http://et.redhat.com/~rjones/libguestfs/ http://et.redhat.com/~rjones/libguestfs/files/ There have been a lot of changes (and indeed versions) out over the past couple of days, but I'll try to summarise the major new features added in the past week: - C++ fixes and Java bindings (so now we support the following with equal status: C, C++, Perl, Python, OCaml, Ruby, Java and shell scripting) - KVM support - QEMU binary is completely configurable at compile & runtime - ext4 support - support for uploading and downloading arbitrary-sized files - support for uploading and downloading tar and tar.gz content - support for querying size of block devices, setting r/o - support for reading ext2/3 superblocks - stat, lstat, statvfs commands - commands to mount filesystems read-only - run arbitrary commands from the guest - file(1) command - readline in guestfish with history and tab completion - guestfish 'edit' command - big documentation improvements, including more on the internals - pkgconfig file - and dozens of bug fixes Enjoy ... Rich. -- Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones New in Fedora 11: Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 70 libraries supprt'd http://fedoraproject.org/wiki/MinGW http://www.annexia.org/fedora_mingw

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Re: [fedora-virt] ANNOUNCE: Augeas support added to libguestfs
by Richard W.M. Jones 22 Apr '09

22 Apr '09

On Wed, Apr 22, 2009 at 07:27:53AM +0200, Ján ONDREJ (SAL) wrote: > checking for JDK in /usr/lib/jvm/java... configure: error: missing > /usr/lib/jvm/java/bin/java binary > > I am not interested in these "java" things, so compilation without java can > be useful, but I also have openjdk installed, just it's in different path: > /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/jre/bin/java Use ./configure --with-java-home=no Please send help requests to fedora-virt, NOT to me directly. I won't answer any more which are just sent to me. Rich. -- Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones virt-p2v converts physical machines to virtual machines. Boot with a live CD or over the network (PXE) and turn machines into Xen guests. http://et.redhat.com/~rjones/virt-p2v

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Re: guestfish can't mount ext4 filesystems?
by Richard W.M. Jones 21 Apr '09

21 Apr '09

On Tue, Apr 21, 2009 at 05:22:53PM -0400, Robert P. J. Day wrote: > > ><fs> mount /dev/f1164guest/lv_root / > libguestfs: error: mount: /dev/f1164guest/lv_root on /: mount: unknown > filesystem type 'ext4' > > that's really going to limit the value of this. or have i done > something wrong? This is the patch: http://git.et.redhat.com/?p=libguestfs.git;a=commitdiff;h=6d5f69f81a888e26a… You're lucky that I'm just building version 1.0.5 right now, so it'll be uploaded to the website, with that fix, in an hour or so. Please don't mail me directly about stuff - mail it to fedora-virt instead. Rich. -- Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones virt-p2v converts physical machines to virtual machines. Boot with a live CD or over the network (PXE) and turn machines into Xen guests. http://et.redhat.com/~rjones/virt-p2v

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Re: guestfish can't mount ext4 filesystems?
by Richard W.M. Jones 21 Apr '09

21 Apr '09

On Tue, Apr 21, 2009 at 05:22:53PM -0400, Robert P. J. Day wrote: > > ><fs> mount /dev/f1164guest/lv_root / > libguestfs: error: mount: /dev/f1164guest/lv_root on /: mount: unknown > filesystem type 'ext4' > > that's really going to limit the value of this. or have i done > something wrong? I've never tried ext4, and looking at the above it seems like I've missed out the ext4 kernel module and/or mount program. I'll put in a patch to fix this in a moment. Rich. -- Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones virt-df lists disk usage of guests without needing to install any software inside the virtual machine. Supports Linux and Windows. http://et.redhat.com/~rjones/virt-df/

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Re: [fedora-virt] ANNOUNCE: Augeas support added to libguestfs
by Richard W.M. Jones 21 Apr '09

21 Apr '09

On Tue, Apr 21, 2009 at 10:12:47PM +0200, Ján ONDREJ (SAL) wrote: > On Tue, Apr 21, 2009 at 09:53:20AM +0200, Ján ONDREJ (SAL) wrote: > > Another feature enhacement requirement: > > > > can you add an option "--kvm" to use qemu-kvm instead of qemu? It's much > > faster (aprox 50%) on machines, which support hardware virtualization. > > Also you need to remove --no-kqemu option, which is not recognized by > > qemu-kvm. May be ability to run kvm may be autodetected in future, but I > > think, if there is no kvm support, qemu-kvm will run in normal qemu mode. > > Some tests with qemu or kvm: > > [ondrejj@work libguestfs]$ time ./fish/guestfish -a /home/images/test.img -m > /dev/sda1 launch > Could not open '/dev/kqemu' - QEMU acceleration layer not activated: No such > /file or directory > qemu: loading initrd (0x139cb32 bytes) at 0x16c53000 > > real 0m27.033s > user 0m0.016s > sys 0m0.047s > [ondrejj@work libguestfs]$ time ./fish/guestfish -a /home/images/test.img -m > /dev/sda1 launch > qemu: loading initrd (0x139cb32 bytes) at 0x0000000016c53000 > > real 0m7.593s > user 0m0.028s > sys 0m0.052s > [ondrejj@work libguestfs]$ > > As you can see, it's more than 3.5 times faster. :) > > May be you can check, if there is qemu-kvm binary and if does not exist, > then use standard qemu. This may be work well on all architectures. Yes, that's a huge improvement. Rich. -- Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://et.redhat.com/~rjones/virt-top

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Re: [fedora-virt] any possible conflict between host and guest "VolGroup00" VGs?
by Richard W.M. Jones 21 Apr '09

21 Apr '09

On Tue, Apr 21, 2009 at 08:13:49AM -0400, Robert P. J. Day wrote: > On Tue, 21 Apr 2009, Robert P. J. Day wrote: > > > > > from "man guestfish": > > > > Guestfish is a shell and command-line tool for examining and modifying > > virtual machine filesystems. It uses libguestfs and exposes all of > > the functionality of the guestfs API, see guestfs(3). > > ^^^^^^^^^^ ??? > > > > i have no such man page entry. where should that come from? > > never mind, i'm guessing there's a "-devel" rpm i need. Yeah, it seems a shame to have guestfish depend on the whole of libguestfs-devel, just to pull in a single manpage ... Rich. -- Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones Read my programming blog: http://rwmj.wordpress.com Fedora now supports 75 OCaml packages (the OPEN alternative to F#) http://cocan.org/getting_started_with_ocaml_on_red_hat_and_fedora

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virt April 2009