- vhostmd

[PATCH 0/2] vm-dump-metrics: Fix segmentation fault and exit code
by Richard W.M. Jones 16 Oct '09

16 Oct '09

This two patches fix a segfault that happens in vm-dump-metrics if you run it on a machine that doesn't have a metrics disk (eg. from the host instead of from the guest). Also makes vm-dump-metrics return status code of 1 on failure. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.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/ -- To unsubscribe, e-mail: vhostmd+unsubscribe(a)opensuse.org For additional commands, e-mail: vhostmd+help(a)opensuse.org

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[PATCH 0/7] Lots of cleanups, don't run the daemon as root, and connect to libvirt readonly
by Richard W.M. Jones 15 Oct '09

15 Oct '09

This patch series is basically a lot of cleanups and should also enhance the security of vhostmd. We should allow administrators to run the daemon as root, we should always connect to libvirt readonly, and we should ensure that the libvirt URI is specified. (Libvirt's heuristics where it tries to guess the default hypervisor are suspect so don't rely on them). Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.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 -- To unsubscribe, e-mail: vhostmd+unsubscribe(a)opensuse.org For additional commands, e-mail: vhostmd+help(a)opensuse.org

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[PATCH] Further changes to avoid using xenstore.
by Richard W.M. Jones 13 Oct '09

13 Oct '09

Sorry, the previous patch was incomplete. With this additional commit I've been able to build vhostmd on a Fedora/PPC system which completely lacks Xen. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.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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[PATCH] Allow xenstore dependency to be removed
by Richard W.M. Jones 12 Oct '09

12 Oct '09

This patch lets you compile vhostmd without xenstore support in the main daemon. Our use-case is for platforms where Xen isn't available. The default is the same as currently - ie. xenstore is compiled in. To disable xenstore, the packager would compile with: ./configure --without-xenstore (this also disables xenstore in the domU tool as before). Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming blog: http://rwmj.wordpress.com Fedora now supports 80 OCaml packages (the OPEN alternative to F#) http://cocan.org/getting_started_with_ocaml_on_red_hat_and_fedora

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[PATCH] Fix --with-xenstore option
by Richard W.M. Jones 12 Oct '09

12 Oct '09

In AC_ARG_WITH you have to use $withval instead of $enableval. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.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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"Memory leak" fixed
by Richard W.M. Jones 12 Oct '09

12 Oct '09

vhostmd in the default configuration runs "virsh dominfo 0", which only makes sense for Xen. For other hypervisors, it causes libvirtd to return an error message. Unfortunately, this provokes a very bad memory leak in libvirtd: https://bugzilla.redhat.com/show_bug.cgi?id=528162 You just need a more recent version of libvirtd which includes the following commit: http://libvirt.org/git/?p=libvirt.git;a=commit;h=c6f1459eb998619ab21a92d9bb… With the latest libvirt, I'm not able to make either vhostmd or libvirt(d) leak memory, but I'm going to run it all overnight just to make sure. 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 -- To unsubscribe, e-mail: vhostmd+unsubscribe(a)opensuse.org For additional commands, e-mail: vhostmd+help(a)opensuse.org

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Making releases?
by Richard W.M. Jones 08 Oct '09

08 Oct '09

Can we make releases of vhostmd, or rather, how do we make releases? It sort of seems like gitorious offers a way to create tarballs from either the head or tags, but I couldn't see how to actually do it. Failing that, I guess we'd need to find alternate hosting for the tarballs. Also I left vhostmd running overnight and it crashed my machine, apparently out of memory error. I'm not sure if this is a slow leak in vhostmd or in something else (libvirtd maybe) but I'm looking into it today. 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 -- To unsubscribe, e-mail: vhostmd+unsubscribe(a)opensuse.org For additional commands, e-mail: vhostmd+help(a)opensuse.org

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[PATCH] Open metrics disk with O_DIRECT.
by Richard W.M. Jones 07 Oct '09

07 Oct '09

In the guest, we really need to open the metrics disk with the O_DIRECT option. Otherwise the guest kernel will cache arbitrary parts of the disk, and won't notice when the host updates it. Now the problem with O_DIRECT is it introduces undetermined restrictions on how you can read from the underlying device. In particular, all read(2) calls must be made with: (a) Buffer must be aligned to a block size. (b) Current file offset must be aligned to a block size. (c) Requested read size must be a multiple of block size. That's quite difficult, but there's a further restriction: There's no reliable way to know what the "block size" is! This patch changes the reads to use O_DIRECT and satisfies the alignment restrictions above, except that we choose an arbitrary block size (64K) which is hopefully large enough to cover any real cases. (Note that this also implies that the minimum size of the metrics disk will be 64K -- currently the default is 256K so we're OK unless a sysadmin reduces the default). 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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[PATCH] Document how to configure a domain with 'virsh edit'
by Richard W.M. Jones 07 Oct '09

07 Oct '09

This adds some documentation to the README about how you can configure vhostmd in a guest using 'virsh edit'. 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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[PATCH] Make the default disk be /dev/shm/vhostmd0.
by Richard W.M. Jones 07 Oct '09

07 Oct '09

[Here are three patches which I committed already (by accident). I'm posting them for review instead here. If there are problems we can revert or amend what was committed.] This first patch changes the default exported disk to be /dev/shm/vhostmd0 (instead of /dev/shm/vhostmd/disk0). Having the intermediate vhostmd directory is problematic because there is no good place to change the permissions on this directory, and if the permissions aren't made more permissive that the default then libvirt will fail to start KVM-based domains. 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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