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# lvm-tag.sh
#
# Description: LVM management with tags
#
#
# Author: David Vossel
# Interface to LVM by Dejan Muhamedagic
# Support: users@clusterlabs.org
# License: GNU General Public License (GPL)
# Copyright: (C) 2017 Dejan Muhamedagic
#
##
# Verify tags setup
##
verify_tags_environment()
{
##
# The volume_list must be initialized to something in order to
# guarantee our tag will be filtered on startup
##
if ! lvm dumpconfig activation/volume_list; then
ocf_log err "LVM: Improper setup detected"
ocf_exit_reason "The volume_list filter must be initialized in lvm.conf for exclusive activation without clvmd"
return $OCF_ERR_GENERIC
fi
##
# Our tag must _NOT_ be in the volume_list. This agent
# overrides the volume_list during activation using the
# special tag reserved for cluster activation
##
if lvm dumpconfig activation/volume_list | grep -e "\"@$OUR_TAG\"" -e "\"${OCF_RESKEY_volgrpname}\""; then
ocf_log err "LVM: Improper setup detected"
ocf_exit_reason "The volume_list in lvm.conf must not contain the cluster tag, \"$OUR_TAG\", or volume group, $OCF_RESKEY_volgrpname"
return $OCF_ERR_GENERIC
fi
return $OCF_SUCCESS
}
check_initrd_warning()
{
# First check to see if there is an initrd img we can safely
# compare timestamps agaist. If not, don't even bother with
# this check. This is known to work in rhel/fedora distros
ls "/boot/*$(uname -r)*.img" > /dev/null 2>&1
if [ $? -ne 0 ]; then
return
fi
##
# Now check to see if the initrd has been updated.
# If not, the machine could boot and activate the VG outside
# the control of pacemaker
##
if [ "$(find /boot -name *.img -newer /etc/lvm/lvm.conf)" = "" ]; then
ocf_log warn "LVM: Improper setup detected"
ocf_log warn "* initrd image needs to be newer than lvm.conf"
# While dangerous if not done the first time, there are many
# cases where we don't simply want to fail here. Instead,
# keep warning until the user remakes the initrd - or has
# it done for them by upgrading the kernel.
#
# initrd can be updated using this command.
# dracut -H -f /boot/initramfs-$(uname -r).img $(uname -r)
#
fi
}
##
# does this vg have our tag
##
check_tags()
{
local owner=`vgs -o tags --noheadings $OCF_RESKEY_volgrpname | tr -d ' '`
if [ -z "$owner" ]; then
# No-one owns this VG yet
return 1
fi
if [ "$OUR_TAG" = "$owner" ]; then
# yep, this is ours
return 0
fi
# some other tag is set on this vg
return 2
}
strip_tags()
{
local i
for i in `vgs --noheadings -o tags $OCF_RESKEY_volgrpname | sed s/","/" "/g`; do
ocf_log info "Stripping tag, $i"
# LVM version 2.02.98 allows changing tags if PARTIAL
vgchange --deltag $i $OCF_RESKEY_volgrpname
done
if [ ! -z `vgs -o tags --noheadings $OCF_RESKEY_volgrpname | tr -d ' '` ]; then
ocf_exit_reason "Failed to remove ownership tags from $OCF_RESKEY_volgrpname"
return $OCF_ERR_GENERIC
fi
return $OCF_SUCCESS
}
set_tags()
{
check_tags
case $? in
0)
# we already own it.
return $OCF_SUCCESS
;;
2)
# other tags are set, strip them before setting
if ! strip_tags; then
return $OCF_ERR_GENERIC
fi
;;
*)
: ;;
esac
vgchange --addtag $OUR_TAG $OCF_RESKEY_volgrpname
if [ $? -ne 0 ]; then
ocf_exit_reason "Failed to add ownership tag to $OCF_RESKEY_volgrpname"
return $OCF_ERR_GENERIC
fi
ocf_log info "New tag \"$OUR_TAG\" added to $OCF_RESKEY_volgrpname"
return $OCF_SUCCESS
}
#
# interface to LVM
#
lvm_init() {
OUR_TAG="pacemaker"
if [ -n "$OCF_RESKEY_tag" ]; then
OUR_TAG=$OCF_RESKEY_tag
fi
vgchange_activate_options="-aly --config activation{volume_list=[\"@${OUR_TAG}\"]}"
vgchange_deactivate_options="-aln"
}
lvm_validate_all() {
if ! verify_tags_environment; then
exit $OCF_ERR_GENERIC
fi
}
lvm_status() {
local rc=0
# If vg is running, make sure the correct tag is present. Otherwise we
# can not guarantee exclusive activation.
if ! check_tags; then
ocf_exit_reason "WARNING: $OCF_RESKEY_volgrpname is active without the cluster tag, \"$OUR_TAG\""
rc=$OCF_ERR_GENERIC
fi
# make sure the environment for tags activation is still valid
if ! verify_tags_environment; then
rc=$OCF_ERR_GENERIC
fi
# let the user know if their initrd is older than lvm.conf.
check_initrd_warning
return $rc
}
lvm_pre_activate() {
if ! set_tags; then
return $OCF_ERR_GENERIC
fi
return 0
}
lvm_post_activate() {
local rc=$1
return $rc
}
lvm_pre_deactivate() {
return 0
}
lvm_post_deactivate() {
local rc=$1
if [ $rc -eq 0 ]; then
strip_tags
rc=$?
fi
return $rc
}
# vim:tabstop=4:shiftwidth=4:textwidth=0:wrapmargin=0

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