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#!/bin/bash
USAGE="This commands provides a utility to control MEMORY utilization for any
gluster daemon.In this, we use cgroup framework to configure MEMORY limit for
a process. Before running this script, make sure that daemon is running.Every
time daemon restarts, it is required to rerun this command to set memory limit
(in bytes) on new daemon process id.User can enter any value between 100
(in Mega bytes) to 8000000000000 for Memory limit in Mega bytes.
Memory limit value is depends on how much maximum memory user wants to restrict
for specific daemon process.If a process will try to consume memore more than
configured value then cgroup will hang/sleep this task and to resume the task
rerun the script with new increase memory limit value ."
if [ $# -ge 1 ]; then
case $1 in
-h|--help) echo " " "$USAGE" | sed -r -e 's/^[ ]+//g'
exit 0;
;;
*) echo "Please Provide correct input for script."
echo "For help correct options are -h of --help."
exit 1;
;;
esac
fi
DIR_EXIST=0
LOC="/sys/fs/cgroup/memory/system.slice/glusterd.service"
echo "Enter Any gluster daemon pid for that you want to control MEMORY."
read daemon_pid
if expr ${daemon_pid} + 0 > /dev/null 2>&1 ;then
CHECK_PID=$(pgrep -f gluster | grep ${daemon_pid})
if [ -z "${CHECK_PID}" ]; then
echo "No daemon is running or pid ${daemon_pid} does not match."
echo "with running gluster processes."
exit 1
fi
else
echo "Entered daemon_pid is not numeric so Rerun the script."
exit 1
fi
if [ -f ${LOC}/tasks ]; then
CHECK_CGROUP=$(grep ${daemon_pid} ${LOC}/tasks)
if [ ${CHECK_CGROUP} ] ;then
echo "pid ${daemon_pid} is attached with default glusterd.service cgroup."
fi
fi
cgroup_name=cgroup_gluster_${daemon_pid}
if [ -f ${LOC}/${cgroup_name}/tasks ];then
CHECK_CGROUP=$(grep ${daemon_pid} ${LOC}/${cgroup_name}/tasks)
if [ ${CHECK_CGROUP} ]; then
val=`cat ${LOC}/${cgroup_name}/memory.limit_in_bytes`
mval=$((val / 1024 / 1024))
echo "pid ${daemon_pid} is already attached ${cgroup_name} with mem value ${mval}."
echo "Press n if you don't want to reassign ${daemon_pid} with new mem value."
DIR_EXIST=1
else
echo "pid ${daemon_pid} is not attached with ${cgroup_name}."
fi
fi
read -p "If you want to continue the script to attach daeomon with new cgroup. Press (y/n)?" choice
case "$choice" in
y|Y ) echo "yes";;
n|N ) echo "no";exit;;
* ) echo "invalid";exit;;
esac
systemctl set-property glusterd.service CPUShares=1024
if [ ${DIR_EXIST} -eq 0 ];then
echo "Creating child cgroup directory '${cgroup_name} cgroup' for glusterd.service."
mkdir -p ${LOC}/${cgroup_name}
if [ ! -f ${LOC}/${cgroup_name}/tasks ];then
echo "Not able to create ${LOC}/${cgroup_name} directory so exit."
exit 1
fi
fi
echo "Enter Memory value in Mega bytes [100,8000000000000]: "
read mem_value
if expr ${mem_value} + 0 > /dev/null 2>&1 ;then
if [ ${mem_value} -lt 100 ] || [ ${mem_value} -gt 8000000000000 ]; then
echo "Entered memory value is not correct,it should be in the range ."
echo "100-8000000000000, Rerun the script with correct value ."
exit 1
else
echo "Entered memory limit value is ${mem_value}."
fi
else
echo "Entered memory value is not numeric so Rerun the script."
exit 1
fi
mem_value=$(($mem_value * 1024 * 1024))
if [ ${DIR_EXIST} -eq 0 ];then
echo "Setting ${mem_value} to memory.limit_in_bytes for ${LOC}/${cgroup_name}."
echo ${mem_value} > ${LOC}/${cgroup_name}/memory.limit_in_bytes
#Set memory value to memory.memsw.limit_in_bytes
echo ${mem_value} > ${LOC}/${cgroup_name}/memory.memsw.limit_in_bytes
# disable oom_control so that kernel will not send kill signal to the
# task once limit has reached
echo 1 > ${LOC}/${cgroup_name}/memory.oom_control
else
#Increase mem_value to memory.memsw.limit_in_bytes
echo ${mem_value} > ${LOC}/${cgroup_name}/memory.memsw.limit_in_bytes
echo "Increase ${mem_value} to memory.limit_in_bytes for ${LOC}/${cgroup_name}."
echo ${mem_value} > ${LOC}/${cgroup_name}/memory.limit_in_bytes
# disable oom_control so that kernel will not send kill signal to the
# task once limit has reached
echo 1 > ${LOC}/${cgroup_name}/memory.oom_control
fi
if ps -T -p ${daemon_pid} | grep gluster > /dev/null; then
for thid in `ps -T -p ${daemon_pid} | grep gluster | awk -F " " '{print $2}'`;
do
echo ${thid} > ${LOC}/${cgroup_name}/tasks ;
done
if cat /proc/${daemon_pid}/cgroup | grep -iw ${cgroup_name} > /dev/null; then
echo "Tasks are attached successfully specific to ${daemon_pid} to ${cgroup_name}."
else
echo "Tasks are not attached successfully."
fi
fi
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