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#!/bin/sh
#
# ocf:pacemaker:HealthIOWait resource agent
#
# Copyright 2004-2023 the Pacemaker project contributors
#
# The version control history for this file may have further details.
#
# This source code is licensed under the GNU General Public License version 2
# (GPLv2) WITHOUT ANY WARRANTY.
#
#
# Measures CPU iowait % via top and writes #health-iowait status into the CIB
#
#######################################################################
# Initialization:
: ${OCF_FUNCTIONS:="${OCF_ROOT}/resource.d/heartbeat/.ocf-shellfuncs"}
. "${OCF_FUNCTIONS}"
: ${__OCF_ACTION:="$1"}
#######################################################################
meta_data() {
cat <<END
<?xml version="1.0"?>
<resource-agent name="HealthIOWait" version="@VERSION@">
<version>1.1</version>
<longdesc lang="en">
System health agent that measures the CPU iowait via top and updates the #health-iowait attribute.
</longdesc>
<shortdesc lang="en">System health based on CPU iowait measurement</shortdesc>
<parameters>
<parameter name="state" unique-group="state">
<longdesc lang="en">
Location to store the resource state in.
</longdesc>
<shortdesc lang="en">State file</shortdesc>
<content type="string" default="${HA_VARRUN%%/}/health-iowait-${OCF_RESOURCE_INSTANCE}.state" />
</parameter>
<parameter name="yellow_limit">
<longdesc lang="en">
Upper limit of iowait percentage to switch the health attribute to yellow. I.e.
the #health-iowait will go yellow if the %iowait of the CPU gets higher than 10%.
</longdesc>
<shortdesc lang="en">Upper limit for yellow health attribute</shortdesc>
<content type="integer" default="10"/>
</parameter>
<parameter name="red_limit">
<longdesc lang="en">
Upper limit of iowait percentage to switch the health attribute to red. I.e.
the #health-iowait will go red if the %iowait of the CPU get higher than 15%.
</longdesc>
<shortdesc lang="en">Upper limit for red health attribute</shortdesc>
<content type="integer" default="15"/>
</parameter>
</parameters>
<actions>
<action name="start" timeout="10s" />
<action name="stop" timeout="10s" />
<action name="monitor" timeout="10s" interval="10s" start-delay="0s" />
<action name="meta-data" timeout="5s" />
<action name="validate-all" timeout="10s" depth="0" />
</actions>
</resource-agent>
END
}
#######################################################################
agent_usage() {
cat <<END
usage: $0 {start|stop|monitor|validate-all|meta-data}
Expects to have a fully populated OCF RA-compliant environment set.
END
}
agent_start() {
agent_monitor
if [ $? -eq $OCF_SUCCESS ]; then
return $OCF_SUCCESS
fi
touch "${OCF_RESKEY_state}"
}
agent_stop() {
agent_monitor
if [ $? -eq $OCF_SUCCESS ]; then
rm "${OCF_RESKEY_state}"
fi
return $OCF_SUCCESS
}
agent_monitor() {
# Monitor _MUST!_ differentiate correctly between running
# (SUCCESS), failed (ERROR) or _cleanly_ stopped (NOT RUNNING).
# That is THREE states, not just yes/no.
if [ -f "${OCF_RESKEY_state}" ]; then
WAIT=$(top -b -n2 | grep Cpu | tail -1 | awk -F",|.[0-9][ %]wa" '{ print $5 }')
# echo "System iowait: " $WAIT
# echo $OCF_RESKEY_yellow_limit
if [ $WAIT -gt ${OCF_RESKEY_red_limit} ] ; then
# echo "System state RED!"
attrd_updater -n "#health-iowait" -U "red" -d "5s"
return $OCF_SUCCESS
fi
if [ $WAIT -gt ${OCF_RESKEY_yellow_limit} ] ; then
# echo "System state yellow."
attrd_updater -n "#health-iowait" -U "yellow" -d "5s"
else
# echo "System state green."
attrd_updater -n "#health-iowait" -U "green" -d "5s"
fi
return $OCF_SUCCESS
fi
return $OCF_NOT_RUNNING
}
is_integer() {
case "$1" in
""|*[0-9]*) return 0 ;;
*) return 1 ;;
esac
}
is_writable_dir() {
dir=$(dirname "$1")
[ -d "$dir" ] && [ -w "$dir" ] && [ -x "$dir" ]
}
agent_validate() {
is_integer "$OCF_RESKEY_yellow_limit" && is_integer "$OCF_RESKEY_red_limit"
if [ $? -ne 0 ]; then
return $OCF_ERR_CONFIGURED
fi
if [ "$OCF_CHECK_LEVEL" = "10" ]; then
is_writable_dir "$OCF_RESKEY_state"
if [ $? -ne 0 ]; then
return $OCF_ERR_ARGS
fi
fi
return $OCF_SUCCESS
}
: ${OCF_RESKEY_CRM_meta_interval:=0}
: ${OCF_RESKEY_CRM_meta_globally_unique:="false"}
if [ -z "$OCF_RESKEY_state" ]; then
if [ "${OCF_RESKEY_CRM_meta_globally_unique}" = "false" ]; then
state="${HA_VARRUN%%/}/HealthIoWait-${OCF_RESOURCE_INSTANCE}.state"
#Strip off the trailing clone marker
OCF_RESKEY_state=$(echo $state | sed s/:[0-9][0-9]*\.state/.state/)
else
OCF_RESKEY_state="${HA_VARRUN%%/}/HealthIoWait-${OCF_RESOURCE_INSTANCE}.state"
fi
fi
if [ -z "${OCF_RESKEY_red_limit}" ] ; then
OCF_RESKEY_red_limit=15
fi
if [ -z "${OCF_RESKEY_yellow_limit}" ] ; then
OCF_RESKEY_yellow_limit=10
fi
case $__OCF_ACTION in
meta-data) meta_data
exit $OCF_SUCCESS
;;
start) agent_start;;
stop) agent_stop;;
monitor) agent_monitor;;
validate-all) agent_validate;;
usage|help) agent_usage
exit $OCF_SUCCESS
;;
*) agent_usage
exit $OCF_ERR_UNIMPLEMENTED
;;
esac
rc=$?
ocf_log debug "${OCF_RESOURCE_INSTANCE} $__OCF_ACTION : $rc"
exit $rc
# vim: set filetype=sh expandtab tabstop=4 softtabstop=4 shiftwidth=4 textwidth=80:
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