devstack/lib/lvm
2015-03-29 23:23:51 +00:00

179 lines
5.2 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
}
# 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|.*|" ]'
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
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: