devstack/lib/lvm
Dan Smith 6cdb2e0f1a Remove the lvm.conf filter during cleanup
This avoids us leaving the filter in the global lvm config. Without cleaning
this up, we can hit some failures to run stack.sh because devices are excluded
that we need to be able to see. This resets it to what it was before when
we do a cleanup.

Also, do this before we add the line, so we don't add multiple lines on
successive runs.

Closes-bug: #1437998
Change-Id: Idbf8a06b723f79ef16a7c175ee77a8c25f813244
2015-04-23 22:12:15 +00:00

187 lines
5.4 KiB
Bash

#!/bin/bash
#
# lib/lvm
# Configure the default LVM volume group used by Cinder and Nova
# Dependencies:
#
# - ``functions`` file
# - ``cinder`` configurations
# DATA_DIR
# clean_default_volume_group - called from clean()
# configure_default_volume_group - called from configure()
# init_default_volume_group - called from init()
# Save trace setting
MY_XTRACE=$(set +o | grep xtrace)
set +o xtrace
# Defaults
# --------
# Name of the lvm volume groups to use/create for iscsi volumes
# This monkey-motion is for compatibility with icehouse-generation Grenade
# If ``VOLUME_GROUP`` is set, use it, otherwise we'll build a VG name based
# on ``VOLUME_GROUP_NAME`` that includes the backend name
# Grenade doesn't use ``VOLUME_GROUP2`` so it is left out
VOLUME_GROUP_NAME=${VOLUME_GROUP:-${VOLUME_GROUP_NAME:-stack-volumes}}
DEFAULT_VOLUME_GROUP_NAME=$VOLUME_GROUP_NAME-default
# Backing file name is of the form $VOLUME_GROUP$BACKING_FILE_SUFFIX
BACKING_FILE_SUFFIX=-backing-file
# Functions
# ---------
# _clean_lvm_volume_group removes all default LVM volumes
#
# Usage: clean_lvm_volume_group $vg
function _clean_lvm_volume_group {
local vg=$1
# Clean out existing volumes
sudo lvremove -f $vg
}
# _clean_lvm_backing_file() removes the backing file of the
# volume group
#
# Usage: _clean_lvm_backing_file() $backing_file
function _clean_lvm_backing_file {
local backing_file=$1
# If the backing physical device is a loop device, it was probably setup by DevStack
if [[ -n "$backing_file" ]] && [[ -e "$backing_file" ]]; then
local vg_dev=$(sudo losetup -j $backing_file | awk -F':' '/'$BACKING_FILE_SUFFIX'/ { print $1}')
sudo losetup -d $vg_dev
rm -f $backing_file
fi
}
# clean_lvm_volume_group() cleans up the volume group and removes the
# backing file
#
# Usage: clean_lvm_volume_group $vg
function clean_lvm_volume_group {
local vg=$1
_clean_lvm_volume_group $vg
# if there is no logical volume left, it's safe to attempt a cleanup
# of the backing file
if [[ -z "$(sudo lvs --noheadings -o lv_name $vg 2>/dev/null)" ]]; then
_clean_lvm_backing_file $DATA_DIR/$vg$BACKING_FILE_SUFFIX
fi
}
# _create_volume_group creates default volume group
#
# Usage: _create_lvm_volume_group() $vg $size
function _create_lvm_volume_group {
local vg=$1
local size=$2
local backing_file=$DATA_DIR/$vg$BACKING_FILE_SUFFIX
if ! sudo vgs $vg; then
# Only create if the file doesn't already exists
[[ -f $backing_file ]] || truncate -s $size $backing_file
local vg_dev=`sudo losetup -f --show $backing_file`
# Only create volume group if it doesn't already exist
if ! sudo vgs $vg; then
sudo vgcreate $vg $vg_dev
fi
fi
}
# init_lvm_volume_group() initializes the volume group creating the backing
# file if necessary
#
# Usage: init_lvm_volume_group() $vg
function init_lvm_volume_group {
local vg=$1
local size=$2
# Start the lvmetad and tgtd services
if is_fedora || is_suse; then
# services is not started by default
start_service lvm2-lvmetad
if [ "$CINDER_ISCSI_HELPER" = "tgtadm" ]; then
start_service tgtd
fi
fi
# Start with a clean volume group
_create_lvm_volume_group $vg $size
# Remove iscsi targets
if [ "$CINDER_ISCSI_HELPER" = "lioadm" ]; then
sudo cinder-rtstool get-targets | sudo xargs -rn 1 cinder-rtstool delete
else
sudo tgtadm --op show --mode target | grep Target | cut -f3 -d ' ' | sudo xargs -n1 tgt-admin --delete || true
fi
_clean_lvm_volume_group $vg
}
# Sentinal value to ensure that init of default lvm volume group is
# only performed once across calls of init_default_lvm_volume_group.
_DEFAULT_LVM_INIT=${_DEFAULT_LVM_INIT:-0}
# init_default_lvm_volume_group() initializes a default volume group
# intended to be shared between cinder and nova. It is idempotent;
# the init of the default volume group is guaranteed to be performed
# only once so that either or both of the dependent services can
# safely call this function.
#
# Usage: init_default_lvm_volume_group()
function init_default_lvm_volume_group {
if [[ "$_DEFAULT_LVM_INIT" = "0" ]]; then
init_lvm_volume_group $DEFAULT_VOLUME_GROUP_NAME $VOLUME_BACKING_FILE_SIZE
_DEFAULT_LVM_INIT=1
fi
}
# clean_lvm_filter() Remove the filter rule set in set_lvm_filter()
#
# Usage: clean_lvm_filter()
function clean_lvm_filter {
sudo sed -i "s/^.*# from devstack$//" /etc/lvm/lvm.conf
}
# set_lvm_filter() Gather all devices configured for LVM and
# use them to build a global device filter
# set_lvm_filter() Create a device filter
# and add to /etc/lvm.conf. Note this uses
# all current PV's in use by LVM on the
# system to build it's filter.
#
# Usage: set_lvm_filter()
function set_lvm_filter {
local filter_suffix='"r|.*|" ] # from devstack'
local filter_string="global_filter = [ "
local pv
local vg
local line
for pv_info in $(sudo pvs --noheadings -o name); do
pv=$(echo -e "${pv_info}" | sed 's/ //g' | sed 's/\/dev\///g')
new="\"a|$pv|\", "
filter_string=$filter_string$new
done
filter_string=$filter_string$filter_suffix
clean_lvm_filter
sudo sed -i "/# global_filter = \[*\]/a\ $global_filter$filter_string" /etc/lvm/lvm.conf
echo_summary "set lvm.conf device global_filter to: $filter_string"
}
# Restore xtrace
$MY_XTRACE
# mode: shell-script
# End: