#!/bin/sh
#
# Copyright (C) 2006 Holger Levsen
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; version 2 dated June,
# 1991.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#
# Configuration variables
#   vservers - specify the vservers to include in the graph (default: all)
#   limits - if true, turn on limit graphing (default: false)
#
# NOTE: If no configuration variables are set, the defaults will be used

# Example /etc/munin/plugin-conf.d/munin-node 
#
# The first group monitors the vservers named "vserver1 vserver2
# vserver3 vserver4" and looks to see if the resource limit has been
# breached, if so it sends a message to nagios via send_nsca, and
# sends an email to notify that this has happened.
#
# The second monitors the vservers "vserver5 vserver6 vserver7" and 
# has no limit notifications turned on.
#
# The third monitors all vservers on the system, in one graph, and it has
# no limit notifications defined.
#
# You can use any combination of these to fit your needs.
#
#
# [vsrmem_group1]
# user root
# env.vservers vserver1 vserver2 vserver3 vserver4
# env.limits 1
# contacts nagios email
# contact.nagios.command /usr/bin/send_nsca -H your.nagios-host.here -c /etc/send_nsca.cfg
# contact.email.command mail -s "Munin-notification for ${var:group} :: ${var:host}" your@email.address.here
#
# [vsrmem_group2]
# user root
# env.vservers vserver5 vserver6 vserver7
# env.limits 0
#
# [vserver_rmemory]
# user root
#
# Graph Vserver RSS usage and limits
#
# Changelog
# version 0.1 - 2006 April xx - Holger Levsen
#  - initial author
# version 0.2 - 2006 April 24 - Micah Anderson <micah@riseup.net>
#  - Add dynamic arch page size determination
#  - Some cleanup and clarification
# version 0.3 - 2006 May 3 - Micah Anderson <micah@riseup.net>
#  - Add ability to group vservers via environment vars
#  - Fix missing close quotes and standardize indents
#  - Add limit notification
#  - Update documentation to include info on groups and limits


VSERVERS="$vservers"
LIMITS="$limits"

if [ "$1" = "config" ]; then
    echo 'graph_title Virtual memory used by vservers'
    echo 'graph_title Vserver virtual memory'
    echo 'graph_args --base 1024k -l 0'
    echo 'graph_vlabel Size of VM pages'
    echo 'graph_category vserver'
    echo 'graph_info Shows virtual page size used by each vserver.'
        
    # do not assume we are on i386 where pagesize is 4096...
    pagesize=`perl -MPOSIX -e 'print POSIX::sysconf(_SC_PAGESIZE), "\n";'`

    if [ -z "$VSERVERS" ]; then	
        for i in `find /proc/virtual/* -type d -exec basename {} \;` ; do 
            NAME=`cat /proc/virtual/$i/cvirt |grep NodeName |cut -f2`
            echo "$NAME.label $NAME"
            echo "$NAME.info Size of virtual pages used by $NAME. (Number multipled by $pagesize to make human)"
            echo "$NAME.cdef $NAME,$pagesize,*"
            if [ ! -z "$LIMITS" -a "$LIMITS" = 1 ]; then
                cat /proc/virtual/$i/limit | awk -v name="$NAME" \
                    '{ if ( $1 == "VM:" ) 
                           {
                            if ( $2 >= $3 ) 
                                { 
                                    printf "%s.critical %d\n", name, $2 
                                }
                           }
                     }'
            fi
        done
    else
        for vserver in $vservers ; do
            echo "$vserver.label $vserver"
            echo "$vserver.info Size of virtual pages by $vserver. (Number multiplied by $pagesize to make human)"
            echo "$vserver.cdef $vserver,$pagesize,*"
            if [ ! -z "$LIMITS" -a "$LIMITS" = 1 ]; then
                XID=`/usr/sbin/vserver-info $vserver CONTEXT`
                LIMIT=`cat /proc/virtual/$XID/limit | grep RSS: | cut -f4`
                if [ ${LIMIT:-0} -gt 0 ]; then
                    echo "$NAME.critical $LIMIT"
                fi
            fi	    
        done
    fi
    exit 0
fi

if [ -z "$VSERVERS" ]; then
    for i in `find /proc/virtual/* -type d -exec basename {} \;` ; do
        NAME=`cat /proc/virtual/$i/cvirt | grep NodeName | cut -f2`
        cat /proc/virtual/$i/limit | awk -v name="$NAME" \
            '{ if ( $1 == "VM:" )
               printf "%s.value %d\n", name, $2 }'
    done
else
    for vserver in $VSERVERS ; do
        XID=`/usr/sbin/vserver-info $vserver CONTEXT`
        cat /proc/virtual/$XID/limit | awk -v name="$vserver" \
            '{ if ( $1 == "VM:" )
        printf "%s.value %d\n", name, $2 }'
    done
fi