libvirt/tools/virt-sanlock-cleanup.in

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Support automatic creation of leases for disks in sanlock The current sanlock plugin requires a central management application to manually add <lease> elements to each guest, to protect resources that are assigned to it (eg writable disks). This makes the sanlock plugin useless for usage in more ad hoc deployment environments where there is no central authority to associate disks with leases. This patch adds a mode where the sanlock plugin will automatically create leases for each assigned read-write disk, using a md5 checksum of the fully qualified disk path. This can work pretty well if guests are using stable disk paths for block devices eg /dev/disk/by-path/XXXX symlinks, or if all hosts have NFS volumes mounted in a consistent pattern. The plugin will create one lockspace for managing disks with filename /var/lib/libvirt/sanlock/__LIBVIRT__DISKS__. For each VM disks, there will be another file to hold a lease /var/lib/libvirt/sanlock/5903e5d25e087e60a20fe4566fab41fd Each VM disk lease is usually 1 MB in size. The script virt-sanlock-cleanup should be run periodically to remove unused lease files from the lockspace directory. To make use of this capability the admin will need to do several tasks: - Mount an NFS volume (or other shared filesystem) on /var/lib/libvirt/sanlock - Configure 'host_id' in /etc/libvirt/qemu-sanlock.conf with a unique value for each host with the same NFS mount - Toggle the 'auto_disk_leases' parameter in qemu-sanlock.conf Technically the first step can be skipped, in which case sanlock will only protect against 2 vms on the same host using the same disk (or the same VM being started twice due to error by libvirt). * src/locking/libvirt_sanlock.aug, src/locking/sanlock.conf, src/locking/test_libvirt_sanlock.aug: Add config params for configuring auto lease setup * libvirt.spec.in: Add virt-sanlock-cleanup program, man page * tools/virt-sanlock-cleanup.in: Script to purge unused disk resource lease files
2011-06-14 08:29:00 +00:00
#!/bin/sh
# A script to cleanup resource leases auto-created by
# the libvirt lock plugin for sanlock
maint: use LGPL correctly Several files called out COPYING or COPYING.LIB instead of using the normal boilerplate. It's especially important that we don't call out COPYING from an LGPL file, since COPYING is traditionally used for the GPL. A few files were lacking copyright altogether. * src/rpc/gendispatch.pl: Add missing copyright. * Makefile.nonreentrant: Likewise. * src/check-symfile.pl: Likewise. * src/check-symsorting.pl: Likewise. * src/driver.h: Likewise. * src/internal.h: Likewise. * tools/libvirt-guests.sh.in: Likewise. * tools/virt-pki-validate.in: Mention copyright in comment, not just code. * tools/virt-sanlock-cleanup.in: Likewise. * src/rpc/genprotocol.pl: Spell out license terms. * src/xen/xend_internal.h: Likewise. * src/xen/xend_internal.c: Likewise. * Makefile.am: Likewise. * daemon/Makefile.am: Likewise. * docs/Makefile.am: Likewise. * docs/schemas/Makefile.am: Likewise. * examples/apparmor/Makefile.am: Likewise. * examples/domain-events/events-c/Makefile.am: Likewise. * examples/dominfo/Makefile.am: Likewise. * examples/domsuspend/Makefile.am: Likewise. * examples/hellolibvirt/Makefile.am: Likewise. * examples/openauth/Makefile.am: Likewise. * examples/python/Makefile.am: Likewise. * examples/systemtap/Makefile.am: Likewise. * examples/xml/nwfilter/Makefile.am: Likewise. * gnulib/lib/Makefile.am: Likewise. * gnulib/tests/Makefile.am: Likewise. * include/Makefile.am: Likewise. * include/libvirt/Makefile.am: Likewise. * python/Makefile.am: Likewise. * python/tests/Makefile.am: Likewise. * src/Makefile.am: Likewise. * tests/Makefile.am: Likewise. * tools/Makefile.am: Likewise. * configure.ac: Likewise. Signed-off-by: Eric Blake <eblake@redhat.com>
2013-05-14 23:42:12 +00:00
# Copyright (C) 2011, 2013 Red Hat, Inc.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see
# <http://www.gnu.org/licenses/>.
Support automatic creation of leases for disks in sanlock The current sanlock plugin requires a central management application to manually add <lease> elements to each guest, to protect resources that are assigned to it (eg writable disks). This makes the sanlock plugin useless for usage in more ad hoc deployment environments where there is no central authority to associate disks with leases. This patch adds a mode where the sanlock plugin will automatically create leases for each assigned read-write disk, using a md5 checksum of the fully qualified disk path. This can work pretty well if guests are using stable disk paths for block devices eg /dev/disk/by-path/XXXX symlinks, or if all hosts have NFS volumes mounted in a consistent pattern. The plugin will create one lockspace for managing disks with filename /var/lib/libvirt/sanlock/__LIBVIRT__DISKS__. For each VM disks, there will be another file to hold a lease /var/lib/libvirt/sanlock/5903e5d25e087e60a20fe4566fab41fd Each VM disk lease is usually 1 MB in size. The script virt-sanlock-cleanup should be run periodically to remove unused lease files from the lockspace directory. To make use of this capability the admin will need to do several tasks: - Mount an NFS volume (or other shared filesystem) on /var/lib/libvirt/sanlock - Configure 'host_id' in /etc/libvirt/qemu-sanlock.conf with a unique value for each host with the same NFS mount - Toggle the 'auto_disk_leases' parameter in qemu-sanlock.conf Technically the first step can be skipped, in which case sanlock will only protect against 2 vms on the same host using the same disk (or the same VM being started twice due to error by libvirt). * src/locking/libvirt_sanlock.aug, src/locking/sanlock.conf, src/locking/test_libvirt_sanlock.aug: Add config params for configuring auto lease setup * libvirt.spec.in: Add virt-sanlock-cleanup program, man page * tools/virt-sanlock-cleanup.in: Script to purge unused disk resource lease files
2011-06-14 08:29:00 +00:00
verbose=1
if test "x$1" = "x-q" ; then
verbose=0
fi
LOCKSPACE="__LIBVIRT__DISKS__"
LOCKDIR=`augtool get '/files@sysconfdir@/libvirt/qemu-sanlock.conf/disk_lease_dir'`
LOCKDIR=${LOCKDIR#* = }
if test $? != 0 || test "x$LOCKDIR" = "x" ; then
LOCKDIR="@localstatedir@/lib/libvirt/sanlock"
Support automatic creation of leases for disks in sanlock The current sanlock plugin requires a central management application to manually add <lease> elements to each guest, to protect resources that are assigned to it (eg writable disks). This makes the sanlock plugin useless for usage in more ad hoc deployment environments where there is no central authority to associate disks with leases. This patch adds a mode where the sanlock plugin will automatically create leases for each assigned read-write disk, using a md5 checksum of the fully qualified disk path. This can work pretty well if guests are using stable disk paths for block devices eg /dev/disk/by-path/XXXX symlinks, or if all hosts have NFS volumes mounted in a consistent pattern. The plugin will create one lockspace for managing disks with filename /var/lib/libvirt/sanlock/__LIBVIRT__DISKS__. For each VM disks, there will be another file to hold a lease /var/lib/libvirt/sanlock/5903e5d25e087e60a20fe4566fab41fd Each VM disk lease is usually 1 MB in size. The script virt-sanlock-cleanup should be run periodically to remove unused lease files from the lockspace directory. To make use of this capability the admin will need to do several tasks: - Mount an NFS volume (or other shared filesystem) on /var/lib/libvirt/sanlock - Configure 'host_id' in /etc/libvirt/qemu-sanlock.conf with a unique value for each host with the same NFS mount - Toggle the 'auto_disk_leases' parameter in qemu-sanlock.conf Technically the first step can be skipped, in which case sanlock will only protect against 2 vms on the same host using the same disk (or the same VM being started twice due to error by libvirt). * src/locking/libvirt_sanlock.aug, src/locking/sanlock.conf, src/locking/test_libvirt_sanlock.aug: Add config params for configuring auto lease setup * libvirt.spec.in: Add virt-sanlock-cleanup program, man page * tools/virt-sanlock-cleanup.in: Script to purge unused disk resource lease files
2011-06-14 08:29:00 +00:00
fi
notify() {
test $verbose = 1 || return
if test "x$1" = "x-n"; then
shift
printf %s "$*"
else
printf %s\\n "$*"
fi
}
cd "$LOCKDIR" || exit 1
for MD5 in *
do
if test $MD5 != '*' && test $MD5 != $LOCKSPACE ; then
Support automatic creation of leases for disks in sanlock The current sanlock plugin requires a central management application to manually add <lease> elements to each guest, to protect resources that are assigned to it (eg writable disks). This makes the sanlock plugin useless for usage in more ad hoc deployment environments where there is no central authority to associate disks with leases. This patch adds a mode where the sanlock plugin will automatically create leases for each assigned read-write disk, using a md5 checksum of the fully qualified disk path. This can work pretty well if guests are using stable disk paths for block devices eg /dev/disk/by-path/XXXX symlinks, or if all hosts have NFS volumes mounted in a consistent pattern. The plugin will create one lockspace for managing disks with filename /var/lib/libvirt/sanlock/__LIBVIRT__DISKS__. For each VM disks, there will be another file to hold a lease /var/lib/libvirt/sanlock/5903e5d25e087e60a20fe4566fab41fd Each VM disk lease is usually 1 MB in size. The script virt-sanlock-cleanup should be run periodically to remove unused lease files from the lockspace directory. To make use of this capability the admin will need to do several tasks: - Mount an NFS volume (or other shared filesystem) on /var/lib/libvirt/sanlock - Configure 'host_id' in /etc/libvirt/qemu-sanlock.conf with a unique value for each host with the same NFS mount - Toggle the 'auto_disk_leases' parameter in qemu-sanlock.conf Technically the first step can be skipped, in which case sanlock will only protect against 2 vms on the same host using the same disk (or the same VM being started twice due to error by libvirt). * src/locking/libvirt_sanlock.aug, src/locking/sanlock.conf, src/locking/test_libvirt_sanlock.aug: Add config params for configuring auto lease setup * libvirt.spec.in: Add virt-sanlock-cleanup program, man page * tools/virt-sanlock-cleanup.in: Script to purge unused disk resource lease files
2011-06-14 08:29:00 +00:00
RESOURCE="$LOCKSPACE:$MD5:$LOCKDIR/$MD5:0"
notify -n "Cleanup: $RESOURCE "
sanlock client command -r $RESOURCE -c /bin/rm -f "$LOCKDIR/$MD5" 2>/dev/null
if test $? = 0 ; then
notify "PASS"
else
notify "FAIL"
fi
fi
done
exit 0