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|
#!/usr/bin/env bash
#
# Kill all the processes/services except glusterd
#
# Usage: ./extras/stop-all-gluster-processes.sh [-g] [-h]
# options:
# -g Terminate in graceful mode
# -h Show this message, then exit
#
# eg:
# 1. ./extras/stop-all-gluster-processes.sh
# 2. ./extras/stop-all-gluster-processes.sh -g
#
# By default, this script executes in force mode, i.e. all of brick, gsyncd
# and other glustershd services/processes are killed without checking for
# ongoing tasks such as geo-rep, self-heal, rebalance and etc. which may lead
# to inconsistency after the node is brought back.
#
# On specifying '-g' option this script works in graceful mode, to maintain
# data consistency the script fails with a valid exit code incase if any of
# the gluster processes are busy in doing their jobs.
#
# The author of page [1] proposes user-defined exit codes to the range 64 - 113
# Find the better explanation behind the choice in the link
#
# The exit code returned by stop-all-gluster-processes.sh:
# 0 No errors/Success
# 64 Rebalance is in progress
# 65 Self-Heal is in progress
# 66 Tier daemon running on this node
# 127 option not found
#
# [1] http://www.tldp.org/LDP/abs/html/exitcodes.html
# global
errors=0
# find the mounts and return their pids
get_mount_pids()
{
local opts
local pid
for opts in $(grep -w fuse.glusterfs /proc/mounts| awk '{print $1":/"$2}');
do
IFS=' ' read -r -a volinfo <<< $(echo "${opts}" | sed 's/:\// /g')
pid+="$(ps -Ao pid,args | grep -w "volfile-server=${volinfo[0]}" |
grep -w "volfile-id=/${volinfo[1]}" | grep -w "${volinfo[2]}" |
awk '{print $1}') "
done
echo "${pid}"
}
# handle mount processes i.e. 'glusterfs'
kill_mounts()
{
local signal=${1}
local pid
for pid in $(get_mount_pids);
do
echo "sending SIG${signal} to mount process with pid: ${pid}";
kill -${signal} ${pid};
done
}
# handle brick processes and node services
kill_bricks_and_services()
{
local signal=${1}
local pidfile
local pid
for pidfile in $(find /var/lib/glusterd/ -name '*.pid');
do
local pid=$(cat ${pidfile});
echo "sending SIG${signal} to pid: ${pid}";
kill -${signal} ${pid};
done
}
# for geo-replication, only 'monitor' has pid file written, other
# processes are not having a pid file, so get it through 'ps' and
# handle these processes
kill_georep_gsync()
{
local signal=${1}
# FIXME: add strick/better check
local gsyncpid=$(ps -Ao pid,args | grep gluster | grep gsync |
awk '{print $1}');
if [ -n "${gsyncpid}" ]
then
echo "sending SIG${signal} to geo-rep gsync process ${gsyncpid}";
kill -${signal} ${gsyncpid} || errors=$((${errors} + 1));
fi
}
# check if all processes are ready to die
check_background_tasks()
{
volumes=$(gluster vol list)
quit=0
for volname in ${volumes};
do
# tiering
if [[ $(gluster volume tier ${volname} status 2> /dev/null |
grep "localhost" | grep -c "in progress") -gt 0 ]]
then
quit=66
break;
fi
# rebalance
if [[ $(gluster volume rebalance ${volname} status 2> /dev/null |
grep -c "in progress") -gt 0 ]]
then
quit=64
break;
fi
# self heal
if [[ $(gluster volume heal ${volname} info | grep "Number of entries" |
awk '{ sum+=$4} END {print sum}') -gt 0 ]];
then
quit=65
break;
fi
# geo-rep, snapshot and quota doesn't need grace checks,
# as they ensures the consistancy on force kills
done
echo ${quit}
}
usage()
{
cat <<EOM
Usage: $0 [-g] [-h]
options:
-g Terminate in graceful mode
-h Show this message, then exit
eg:
1. $0
2. $0 -g
EOM
}
main()
{
while getopts "gh" opt; do
case $opt in
g)
# graceful mode
quit=$(check_background_tasks)
if [[ ${quit} -ne 0 ]]
then
exit ${quit};
fi
# else safe to kill
;;
h)
usage
exit 0;
;;
*)
usage
exit 127;
;;
esac
done
# remove all the options that have been parsed by getopts
shift $((OPTIND-1))
kill_mounts TERM
kill_bricks_and_services TERM
kill_georep_gsync TERM
sleep 5;
echo ""
# still not Terminated? let's pass SIGKILL
kill_mounts KILL
kill_bricks_and_services KILL
kill_georep_gsync KILL
exit ${errors};
}
main "$@"
|
