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Editing: NodeUtilization

#!/bin/sh
#
#
#	NodeUtilization OCF Resource Agent
#
# Copyright (c) 2011 SUSE LINUX, John Shi
# Copyright (c) 2016 SUSE LINUX, Kristoffer Gronlund
#                    All Rights Reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# Further, this software is distributed without any warranty that it is
# free of the rightful claim of any third person regarding infringement
# or the like.  Any license provided herein, whether implied or
# otherwise, applies only to this software file.  Patent licenses, if
# any, provided herein do not apply to combinations of this program with
# other software, or any other product whatsoever.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
#
#######################################################################
# Initialization:

: ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/lib/heartbeat}
. ${OCF_FUNCTIONS_DIR}/ocf-shellfuncs

#######################################################################

NodeUtilization_meta_data() {
	cat <<END
<?xml version="1.0"?>
<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
<resource-agent name="NodeUtilization">
<version>1.0</version>

<longdesc lang="en">
The Node Utilization agent detects system parameters like available CPU, host
memory and hypervisor memory availability, and adds them into the CIB for each
node using crm_attribute. Run the agent as a clone resource to have it populate
these parameters on each node.
Note: Setting hv_memory only works with Xen at the moment, using the xl or xm
command line tools.
</longdesc>
<shortdesc lang="en">Node Utilization</shortdesc>

<parameters>
<parameter name="dynamic" unique="0" required="0">
<longdesc lang="en">
If set, parameters will be updated if there are differences between the HA
parameters and the system values when running the monitor action.
If not set, the parameters will be set once when the resource instance starts.
</longdesc>
<shortdesc lang="en">Dynamically update parameters in monitor</shortdesc>
<content type="boolean" default="true" />
</parameter>

<parameter name="utilization_cpu" unique="0" required="0">
<longdesc lang="en">Enable setting node CPU utilization limit.</longdesc>
<shortdesc lang="en">Set node CPU utilization limit.</shortdesc>
<content type="boolean" default="true" />
</parameter>

<parameter name="utilization_cpu_reservation" unique="0" required="0">
<longdesc lang="en">Subtract this value when setting the CPU utilization parameter.</longdesc>
<shortdesc lang="en">CPU reservation.</shortdesc>
<content type="integer" default="1" />
</parameter>

<parameter name="utilization_host_memory" unique="0" required="0">
<longdesc lang="en">Enable setting available host memory.</longdesc>
<shortdesc lang="en">Set available host memory.</shortdesc>
<content type="boolean" default="true" />
</parameter>

<parameter name="utilization_host_memory_reservation" unique="0" required="0">
<longdesc lang="en">Subtract this value when setting host memory utilization, in MB.</longdesc>
<shortdesc lang="en">Host memory reservation, in MB.</shortdesc>
<content type="integer" default="512" />
</parameter>

<parameter name="utilization_hv_memory" unique="0" required="0">
<longdesc lang="en">Enable setting available hypervisor memory.</longdesc>
<shortdesc lang="en">Set available hypervisor memory.</shortdesc>
<content type="boolean" default="true" />
</parameter>

<parameter name="utilization_hv_memory_reservation" unique="0" required="0">
<longdesc lang="en">Subtract this value when setting hypervisor memory utilization, in MB.</longdesc>
<shortdesc lang="en">Hypervisor memory reservation, in MB.</shortdesc>
<content type="integer" default="512" />
</parameter>
</parameters>

<actions>
<action name="start"   timeout="90s" />
<action name="stop"    timeout="100s" />
<action name="monitor" timeout="20s" interval="60s"/>
<action name="meta-data"  timeout="5s" />
<action name="validate-all"  timeout="30s" />
</actions>
</resource-agent>
END
}

Host_Total_Memory() {
    local xentool

xentool=$(which xl 2> /dev/null || which xm 2> /dev/null)

if [ -x $xentool ]; then
        $xentool info | awk '/total_memory/{printf("%d\n",$3);exit(0)}'
    else
        ocf_log warn "Can only set hv_memory for Xen hypervisor"
        echo "0"
    fi
}

set_utilization() {
    host_name="$(ocf_local_nodename)"

if ocf_is_true "$OCF_RESKEY_utilization_cpu"; then
        sys_cpu=$(( $(grep -c processor /proc/cpuinfo) - $OCF_RESKEY_utilization_cpu_reservation ))
        uti_cpu=$(crm_attribute --quiet -t nodes --node "$host_name" -z -n cpu 2>/dev/null)

if [ "$sys_cpu" != "$uti_cpu" ]; then
            if ! crm_attribute -t nodes --node "$host_name" -z -n cpu -v $sys_cpu; then
                ocf_log err "Failed to set the cpu utilization attribute for $host_name using crm_attribute."
                return 1
            fi
        fi
    fi

if ocf_is_true "$OCF_RESKEY_utilization_host_memory"; then
        sys_mem=$(( $(awk '/MemTotal/{printf("%d\n",$2/1024);exit(0)}' /proc/meminfo) - $OCF_RESKEY_utilization_host_memory_reservation ))
        uti_mem=$(crm_attribute --quiet -t nodes --node "$host_name" -z -n host_memory 2>/dev/null)

if [ "$sys_mem" != "$uti_mem" ]; then
            if ! crm_attribute -t nodes --node "$host_name" -z -n host_memory -v $sys_mem; then
                ocf_log err "Failed to set the host_memory utilization attribute for $host_name using crm_attribute."
                return 1
            fi
        fi
    fi

if ocf_is_true "$OCF_RESKEY_utilization_hv_memory"; then
        hv_mem=$(( $(Host_Total_Memory) - OCF_RESKEY_utilization_hv_memory_reservation ))
        uti_mem=$(crm_attribute --quiet -t nodes --node "$host_name" -z -n hv_memory 2>/dev/null)

[ $hv_mem -lt 0 ] && hv_mem=0

if [ "$hv_mem" != "$uti_mem" ]; then
            if ! crm_attribute -t nodes --node "$host_name" -z -n hv_memory -v $hv_mem; then
                ocf_log err "Failed to set the hv_memory utilization attribute for $host_name using crm_attribute."
                return 1
            fi
        fi
    fi
}

NodeUtilization_usage() {
    cat <<END
usage: $0 {start|stop|monitor|validate-all|meta-data}

Expects to have a fully populated OCF RA-compliant environment set.
END
}

NodeUtilization_start() {
    ha_pseudo_resource $statefile start
    if ! ocf_is_true "$OCF_RESKEY_dynamic"; then
        if ! set_utilization; then
            exit $OCF_ERR_GENERIC
        fi
    fi
    exit $OCF_SUCCESS
}

NodeUtilization_stop() {
    ha_pseudo_resource $statefile stop
    exit $OCF_SUCCESS
}

NodeUtilization_monitor() {
    local rc
    ha_pseudo_resource $statefile monitor
    rc=$?

case $rc in
        $OCF_SUCCESS)
            if ocf_is_true "$OCF_RESKEY_dynamic"; then
                if ! set_utilization; then
                    exit $OCF_ERR_GENERIC
                fi
            fi
            ;;
        *) exit $rc;;
    esac
}

NodeUtilization_validate() {
    exit $OCF_SUCCESS
}

statefile=$OCF_RESOURCE_TYPE.$(echo $OCF_RESOURCE_INSTANCE | sed -e 's/^.*://')

: ${OCF_RESKEY_pidfile:="$HA_VARRUN/NodeUtilization-${OCF_RESOURCE_INSTANCE}"}
: ${OCF_RESKEY_dynamic:="true"}
: ${OCF_RESKEY_utilization_cpu:="true"}
: ${OCF_RESKEY_utilization_cpu_reservation="1"}
: ${OCF_RESKEY_utilization_hv_memory:="true"}
: ${OCF_RESKEY_utilization_hv_memory_reservation="512"}
: ${OCF_RESKEY_utilization_host_memory:="true"}
: ${OCF_RESKEY_utilization_host_memory_reservation="512"}

OCF_REQUIRED_PARAMS=""
OCF_REQUIRED_BINARIES=""
ocf_rarun $*

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