WikiTeki /  WillyManga / Notes / MuninEtOpenVZ

Un exemple de script depuis le wiki d'OpenVZ qui permet de surveiller l'état des beancounter

Attention le shebang a été espacé d'une ligne afin de ne pas entrer en conflit avec le formatage du wiki

# !/bin/sh
#
# Munin's plugin to monitor OpenVZ bean counters.
#
# $Log$
# Revision 1.3 2007/07/19 12:57:00 Jan Tomasek <jan@tomasek.cz>
# * rewrited to work with /proc/bc/<VEID>/resources instead of
# /proc/user_beancounters, that simplified code and result
# is also bit faster.
# * added references to OpenVZ wiki
# Revision 1.3.1 2008/05/13 01:26:00 Daniel Hahler <http://daniel.hahler.de/>
# * Minor fixes
#   - "exit 0" in "config" block
#   - Use "echo ${str%% *}" in "suggest", instead of "vals=($str); echo ${vals[0]}"
#
# Revision 1.3.2 2008/08/09 12:30:00 Christian Rubbert <crubbert@xrc.de>
# * Feature
#   - If only 1 variable is graphed, also display maxheld, barrier and limit
#
# Original revision taken from:
# http://wiki.openvz.org/Monitoring_openvz_resources_using_munin
#
#%# family=auto
#%# capabilities=autoconf suggest
 
VEID=`basename $0 | sed -e 's/^vebc_.*_//'`;
STATS=`basename $0 | sed -e 's/^vebc_//' -e 's/_[0-9]*$//' -e 's/_/ /g'`
x=0; STATSCNT=`for i in $STATS; do x=$[$x+1]; done; echo $x`
 
if [ "$1" = "autoconf" ]; then
    if [ -r /proc/bc/0/resources ]; then
        echo yes
        exit 0
    else
        echo "no (/proc/bc/0/resources not found)"
        exit 1
    fi
fi
 
if [ "$1" = "suggest" ]; then
    if [ -r /proc/bc/0/resources ]; then
        cat /proc/bc/0/resources | while read str; do
        # Print everything before " "
        echo ${str%% *}
        done
        exit 0
    else
        exit 1
    fi
fi
 
if [ ! -f /proc/bc/$VEID/resources ]; then
    exit 0;
fi
 
if [ "$1" = "config" ]; then
    #echo "graph_order down up"
    echo "graph_title VE$VEID: $STATS"
    echo "graph_vlabel bean counters"
    echo "graph_category VE$VEID"
 
    # Note on URLs. General graph info is by munin version 1.2.5
    # accepted even with HTML code. But for value.info it escapes URL,
    # I expect that authors of munin will note that in future and put
    # escaping even for graph.info.
    echo "graph_info VE bean counters info. Documentation of the OpenVZ resource management is located at <a href=\"
http://wiki.openvz.org/UBC\">http://wiki.openvz.org/UBC</a>."
 
    cat /proc/bc/$VEID/resources | while read name value top warn max stuff ; do
        for statname in $STATS; do
        if [ "$name" = "$statname" ]; then
            URL="http://wiki.openvz.org/$name"
            if [ "$warn" = "0" ]; then
                warn=$max
            fi
            echo $name.label $name
            echo $name.warning $warn
            echo $name.critical $max
            echo $name.info Description of this resource is located at $URL
        fi
        done
    done
 
    if [ "$STATSCNT" = "1" ]; then
        echo maxheld.label Maxheld
        echo maxheld.draw LINE2
        echo maxheld.info Maximum value
        echo barrier.label Barrier
        echo barrier.draw LINE2
        echo barrier.info Barrier
        echo limit.label Limit
        echo limit.draw LINE2
        echo limit.info Limit
    fi
    exit 0
fi;
 
cat /proc/bc/$VEID/resources | while read name value top warn max stuff ; do
    for statname in $STATS; do
    if [ "$name" = "$statname" ]; then
        echo $name".value "$value;
 
        if [ "$STATSCNT" = "1" ]; then
            echo maxheld.value $top
            echo barrier.value $warn
            echo limit.value $max 
        fi
    fi
    done
done

• enregistrer le fichier dans /usr/local/share/munin/plugins/openvz_beancounter

• faire un lien symbolique comme par exemple ln -s /usr/local/share/munin/plugins/openvz_beancounter /etc/munin/plugins/vebc_resource1_resource2_resourceN_CTID où chaque resourceN est le nom d'un paramètre qu'on souhaite surveiller. Ex: kmemsize, privvmpages

  • Il est à noter qu'il faut créer un lien symbolique à chaque fois qu'on met sur pied un nouveau CT et préciser les paramètres qu'on souhaite surveiller

• attribuer les droits root au processus sur un fichier qu'on va appeler openvz_beancounter qui sera situé dans /etc/munin/plugins-conf.d

[vebc*]
 user root

• redémarrer munin-node et attendre ...