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Hahn Axel (hahn) authoredHahn Axel (hahn) authored
check_haproxy_status 7.30 KiB
#!/bin/bash
# ======================================================================
#
# NAGIOS CLIENT CHECK :: haproxy status
# show current requests to frontend and backend
#
# ----------------------------------------------------------------------
# settings values are parsed by a given section.
# if it fails it scans other sections .. finally default and global
# see getCfgvar
# ----------------------------------------------------------------------
# 2020-04-27 v1.0 <axel.hahn@iml.unibe.ch>
# 2020-04-28 v1.1 <axel.hahn@iml.unibe.ch> added status and max connections for frontend and backend
# 2020-04-29 v1.2 <axel.hahn@iml.unibe.ch> parse ini section by given section
# 2020-06-03 v1.3 <axel.hahn@iml.unibe.ch> added ping to each backend server
# ======================================================================
. `dirname $0`/inc_pluginfunctions
cfgfile=/etc/haproxy/haproxy.cfg
cfgfile2=/tmp/haproxy.config
tmpfile=/tmp/check_haproxy_status_$$
tmpfile2=/tmp/check_haproxy_status2_$$
tmpfileping=/tmp/check_haproxy_status3_$$
# ----------------------------------------------------------------------
# pre checks
# ----------------------------------------------------------------------
ph.reqire wget
if [ ! -f $cfgfile ]; then
ph.abort "UNKNOWN: config file does not exist: $cfgfile"
fi
cat $cfgfile >/dev/null
if [ $? -ne 0 ]; then
ph.abort "UNKNOWN: unable to read ha proxy config $cfgfile ... `ls -l $cfgfile`"
fi
cat $cfgfile | grep "\ mode\ .*http" >/dev/null
if [ $? -ne 0 ]; then
ph.abort "UNKNOWN: haproxy is not in http mode"
fi
# ----------------------------------------------------------------------
# functions
# ----------------------------------------------------------------------
# rewrite the ha proxy config file to parse it by section
function cfgrewriter(){
local _section=
IFS=''
while read line
do
echo $line | grep "^[a-z]" >/dev/null
if [ $? -eq 0 ]; then
_section=$line
echo "# new section: $_section"
fi
echo $line | grep "^\ \ [a-z]*" >/dev/null
if [ $? -eq 0 ]; then
echo -n "$_section: "
echo $line | sed "s#\ \ # #g"
fi
done < $cfgfile
}
# get a value from a given a given section
function _getCfgVarFromSection(){
local _var=$1
local _section=$2
grep "^${_section}:\ \ ${_var}\ " $cfgfile2 >/dev/null && (
typeset -i local _iColumnVal=`echo "${_section}: $_var" | wc -c`+1
grep "^${_section}:\ \ ${_var}\ " $cfgfile2 | cut -c ${_iColumnVal}-
)
}
# get a value from config - with autoscan of other sections
function getCfgvar(){
local _var=$1
local _section=$2
_getCfgVarFromSection "${_var}" "${_section}" \
|| _getCfgVarFromSection "${_var}" "frontend stats_frontend" \
|| _getCfgVarFromSection "${_var}" "frontend couchdb_frontend" \
|| _getCfgVarFromSection "${_var}" "frontend postgresql_frontend" \
|| _getCfgVarFromSection "${_var}" "frontend opencpu" \
|| _getCfgVarFromSection "${_var}" "frontend apache_fop" \
|| _getCfgVarFromSection "${_var}" "defaults" \
|| _getCfgVarFromSection "${_var}" "global"
}
# find a column number of a given field name in haproxy csv
function getColnumber(){
cat $tmpfile | head -1 | sed 's#,#\n#g' | grep -n "^$1$" | cut -f 1 -d ':'
}
# get column #N
function getColumn(){
typeset -i local _iNumber=$1
local _filter=$2
test -z $_filter && _filter='.*'
grep "$_filter" $tmpfile | grep -v "stats_frontend" | cut -f 2,$_iNumber -d ','
}
# ----------------------------------------------------------------------
# build url
# ----------------------------------------------------------------------
cfgrewriter >$cfgfile2
# getCfgvar "bind" "frontend stats_frontend"
# getCfgvar "stats auth" "frontend stats_frontend"
# exit
proto=http
auth=
host=localhost
typeset -i port=80
uri=
getCfgvar "bind" "frontend stats_frontend" | grep "\ ssl\ " >/dev/null && proto=https
auth=`getCfgvar "stats auth" "frontend stats_frontend"`
port=`getCfgvar "bind" "frontend stats_frontend" | cut -f 2 -d ':' | cut -f 1 -d " "`
host=`getCfgvar "bind" "frontend stats_frontend" | cut -f 1 -d ':'`
uri=` getCfgvar "stats uri" "frontend stats_frontend"`
if [ "$host" = "*" ]; then
host="localhost"
fi
url="$proto://${auth}@${host}:${port}${uri};csv;norefresh"
urlmasked="$proto://*password*@${host}:${port}${uri};csv;norefresh"
# ----------------------------------------------------------------------
# check output
# ----------------------------------------------------------------------
# --- get status page
wget --no-check-certificate -O $tmpfile $url 2>/dev/null
if [ $? -ne 0 ]; then
rm -f $tmpfile $cfgfile2
ph.abort "UNKNOWN: url $urlmasked did not respond. `wget --no-check-certificate -O - -S $url`"
fi
colLimit=`getColnumber "slim"`
colCurrentConnections=`getColnumber "scur"`
colStatus=`getColnumber "status"`
statusFront=`getColumn $colStatus ",FRONTEND," | cut -f 2 -d ","`
statusBack=` getColumn $colStatus ",BACKEND," | cut -f 2 -d ","`
typeset -i iMaxConnFront=`getColumn $colLimit ",FRONTEND,"`
typeset -i iMaxConnBack=` getColumn $colLimit ",BACKEND,"`
typeset -i iFrontend=`getColumn $colCurrentConnections ",FRONTEND,"`
typeset -i iFrontendFree=$iMaxConnFront-$iFrontend
typeset -i iBackend=` getColumn $colCurrentConnections ",BACKEND," `
typeset -i iBackendFree=$iMaxConnBack-$iBackend
statusExt=
if [ ! "$statusFront" = "OPEN" ]; then
ph.setStatus "critical"
statusExt="${statusExt}ERROR: frontend status is not OPEN - it is ${statusFront}\n"
fi
if [ ! "$statusBack" = "UP" ]; then
ph.setStatus "critical"
statusExt="${statusExt}ERROR: backend status is not UP - it is ${statusBack}\n"
fi
ph.status "FRONT: $statusFront - ${iFrontend} (max: ${iMaxConnFront}) .. BACK: $statusBack - $iBackend (max: ${iMaxConnBack})"
test -z "$statusExt" || echo "${statusExt}"
# echo; echo DEBUG: ; cat $tmpfile
ph.perfadd "frontend" "${iFrontend}"
ph.perfadd "frontend-max" "${iMaxConnFront}"
ph.perfadd "frontend-free" "${iFrontendFree}"
ph.perfadd "backend" "${iBackend}"
ph.perfadd "backend-max" "${iMaxConnBack}"
ph.perfadd "backend-free" "${iBackendFree}"
# ----------------------------------------------------------------------
# show server connections and summary (FRONTEND/ BACKEND)
# ----------------------------------------------------------------------
getColumn $colCurrentConnections | sed -n "2,$ p" >$tmpfile2
while read line
do
srv=`echo $line | cut -f 1 -d ","`
val=`echo $line | cut -f 2 -d ","`
label=`echo $srv | tr [:upper:] [:lower:]`
# echo "${srv} - ${val}"
echo -n "${srv} - ${val} "
# v1.3: if it is a servername then ping to it
echo ${srv} | grep "^[a-z0-9\-\.]" >/dev/null
if [ $? -eq 0 ]; then
ping -c 1 ${srv} >$tmpfileping
grep "\ 0%\ packet\ loss" $tmpfileping >/dev/null
if [ $? -eq 0 ]; then
echo "- Ping OK"
else
echo "- Ping FAILED"
cat $tmpfileping
test "`ph.status`" = "OK" && ph.setStatus "warning"
fi
rm -f $tmpfileping
else
echo
fi
# performance data: send summary only
# echo ${srv} | egrep "(FRONTEND|BACKEND)" >/dev/null && ph.perfadd "${label}" "${val}"
done < $tmpfile2
rm -f $cfgfile2 $tmpfile $tmpfile2 2>/dev/null
ph.exit
# ----------------------------------------------------------------------