#!/bin/bash
######################################################################################################################
#                  Plugin to monitor basic statistics of EMC VNX 5300 Unified Datamovers                             #
######################################################################################################################

# Author: Evgeny Beysembaev <megabotva@gmail.com>

#####################################
#         Description               #
#####################################

# The plugin monitors basic statistics of EMC Unified Storage system Datamovers. Probably it can also be compatible with 
# other Isilon or Celerra systems. It uses SSH to connect to Control Stations, then remotely executes 
# /nas/sbin/server_stats and fetches and parses data from it. It supports gathering data both from active/active 
# and active/passive Datamover configurations, ignoring offline or standby Datamovers. If all Datamovers are 
# offline or absent, the plugin returns error.
# This plugin also automatically chooses Primary Control Station from the list by calling /nasmcd/sbin/getreason and 
# /nasmcd/sbin/t2slot.
# 
# Data is gathered from basic-std Statistics Group
# 
# It's quite easy to comment out unneeded data to make graphs less overloaded or to add new statistics sources.
 
#####################################
#        Configuration              #
#####################################

# The plugin uses SSH to connect to Control Stations. It's possible to use 'nasadmin' user, but it would be better
# if you create read-only global user by Unisphere Client. The user should have only Operator role.
# I created "operator" user but due to the fact that Control Stations already had one internal "operator" user,
# the new one was called "operator1". So be careful.
# 
# On munin-node side choose a user which will be used to connect through SSH. Generally user "munin" is ok. Then,
# execute "sudo su munin -s /bin/bash", "ssh-keygen" and "ssh-copy-id" to both Control Stations with newly created 
# user.
# 
# Make a link from /usr/share/munin/plugins/emc_vnx_dm_basic_stats to /etc/munin/plugins/emc_vnx_dm_basic_stats_<NAME>,
# where <NAME> is any arbitrary name of your storage system. The plugin will return <NAME> in its answer 
# as "host_name" field.
# Assume your storage system is called "VNX5300".
# 
# Make a configuration file at /etc/munin/plugin-conf.d/emc_vnx_dm_basic_stats_VNX5300
# 
# [emc_vnx_dm_basic_stats_vnx5300]
# user munin							# SSH Client local user
# env.username operator1					# Remote user with Operator role
# env.cs_addr 192.168.1.1 192.168.1.2				# Control Stations addresses
# env.nas_servers server_2 server_3				# This is the default value and can be omitted

#####################################
#           History                 #
#####################################

# 08.11.2016 - First Release

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

export LANG=C

TARGET=$(echo "${0##*/}" | cut -d _ -f 6)
: ${nas_servers:="server_2 server_3"}
SSH_CHECK='ssh -q $username@$CS "/nasmcd/sbin/getreason | grep -w slot_\`/nasmcd/sbin/t2slot\` | cut -d- -f1"'

if [ "$1" = "autoconf" ]; then
	echo "yes"
	exit 0
fi

if [ -z "$username" ]; then
	echo "No username!"
	exit 1
fi

if [ -z "$cs_addr" ]; then
	echo "No control station addresses!"
	exit 1
fi

#Choosing Cotrol Station. Code have to be "10"
for CS in $cs_addr; do
	if [ "`eval $SSH_CHECK`" -eq "10" ]; then
#		echo "$CS is Primary"
		PRIMARY_CS=$CS
		break
	fi
done

if [ -z "$PRIMARY_CS" ]; then
	echo "No alive primary Control Station from list \"$cs_addr\"";
	exit 1;
fi

SSH="ssh -q $username@$PRIMARY_CS . /home/operator1/.bash_profile; "

echo "host_name ${TARGET}"

if [ "$1" = "config" ] ; then
	for server in $nas_servers; do
		$SSH nas_server -i $server | grep -q 'type *= nas'
		if [ "$?" != 0 ]  ; then continue; fi
		nas_server_ok=TRUE
		echo "multigraph emc_vnx_cpu_percent
graph_title EMC VNX 5300 Datamover CPU Util %
graph_vlabel %
graph_category cpu
${server}_cpuutil.min 0
${server}_cpuutil.label $server CPU util. in % in this interval."
		echo "
multigraph emc_vnx_network_kib
graph_title EMC VNX 5300 Datamover Network bytes over all interfaces
graph_vlabel B/s sent (+)/ recv. (-)
graph_category network
graph_args --base 1000
${server}_net_in.graph no
${server}_net_in.label none
${server}_net_in.cdef ${server}_net_in,1000,*
${server}_net_out.label $server B/s
${server}_net_out.cdef ${server}_net_out,1000,*
${server}_net_out.negative ${server}_net_in
${server}_net_out.draw AREA"
		echo "
multigraph emc_vnx_storage_kib
graph_title EMC VNX 5300 Datamover Storage bytes over all interfaces
graph_vlabel B/s sent (+)/ recv. (-)
graph_category network
graph_args --base 1000
${server}_stor_read.graph no
${server}_stor_read.label none
${server}_stor_read.cdef ${server}_stor_read,1000,*
${server}_stor_write.label $server B/s
${server}_stor_write.cdef ${server}_stor_write,1000,*
${server}_stor_write.negative ${server}_stor_read
${server}_stor_write.draw AREA"
	done
	if [ -z $nas_server_ok ]; then
		echo "No active data movers!"
		exit 1
	fi
exit 0
fi

for server in $nas_servers; do
	$SSH nas_server -i $server | grep -q 'type *= nas'
	if [ "$?" != 0 ]  ; then continue; fi
	nas_server_ok=TRUE
	member_elements=`$SSH server_stats $server -count 1 -terminationsummary no -titles never `
	NUMCOL=5
	IFS=$' ' read -ra graphs <<< $member_elements

	echo "multigraph emc_vnx_cpu_percent"
	echo "${server}_cpuutil.value ${graphs[1]}"

	echo "
multigraph emc_vnx_network_kib"
	echo "${server}_net_in.value ${graphs[2]}"
	echo "${server}_net_out.value ${graphs[3]}"

	echo "
multigraph emc_vnx_storage_kib"
	echo "${server}_stor_read.value ${graphs[4]}"
	echo "${server}_stor_write.value ${graphs[5]}"

done
if [ -z $nas_server_ok ]; then
	echo "No active data movers!"
	exit 1
fi
exit 0