Install the necessary components:
sudo apt-get install curl
Activate the module information about apache2 (usually it is activated initially):
sudo a2enmod info
Open the configuration file of the module and specify the IP address of the zabbix server to allow it to view information about apache2 (if apache2 is on the local machine, then access is usually allowed by specifying local or 127.0.0.1):
sudo nano /etc/apache2/mods-enabled/status.conf
In the nano editor, CTRL+X is used to exit and y/n to save or discard changes. Example of specifying IP:
<Location /server-status>
SetHandler server-status
Require local
Require ip 192.168.1.5
</Location>
Restart the web server to apply the changes:
sudo service apache2 restart
Now the information about apache2 is available through the browser by the link http://HOST/server-status
Let’s move on to Zabbix. Create a folder for scripts if it does not exist:
mkdir /etc/zabbix/scripts/ chown root:zabbix -R /etc/zabbix/scripts/ chmod 750 /etc/zabbix/scripts/
In the zabbix server configuration file, we specify the path to this folder:
sudo nano /etc/zabbix/zabbix_server.conf
ExternalScripts=PATH
Now I will give the content of the script:
#!/bin/bash
if [[ -z "$1" || -z "$2" || -z "$3" ]]; then
exit 1
fi
##### PARAMETERS #####
RESERVED="$1"
METRIC="$2"
URL="$3"
STATSURL="${URL}?auto"
#
CACHE_TTL="55"
CACHE_FILE="/tmp/zabbix.apache2.`echo ${URL} | md5sum | cut -d" " -f1`.cache"
EXEC_TIMEOUT="2"
NOW_TIME=`date '+%s'`
##### RUN #####
if [ -s "${CACHE_FILE}" ]; then
CACHE_TIME=`stat -c"%Y" "${CACHE_FILE}"`
else
CACHE_TIME=0
fi
DELTA_TIME=$((${NOW_TIME} - ${CACHE_TIME}))
#
if [ ${DELTA_TIME} -lt ${EXEC_TIMEOUT} ]; then
sleep $((${EXEC_TIMEOUT} - ${DELTA_TIME}))
elif [ ${DELTA_TIME} -gt ${CACHE_TTL} ]; then
echo "" >> "${CACHE_FILE}" # !!!
DATACACHE=`curl -sS --insecure --max-time ${EXEC_TIMEOUT} "${STATSURL}" 2>&1`
echo "${DATACACHE}" > "${CACHE_FILE}" # !!!
echo "URL=${URL}" >> "${CACHE_FILE}" # !!!
chmod 640 "${CACHE_FILE}"
fi
#
if [ "${METRIC}" = "accesses" ]; then
cat "${CACHE_FILE}" | grep -i "accesses" | cut -d':' -f2 | head -n1
fi
if [ "${METRIC}" = "kbytes" ]; then
cat "${CACHE_FILE}" | grep -i "kbytes" | cut -d':' -f2 | head -n1
fi
if [ "${METRIC}" = "cpuload" ]; then
cat "${CACHE_FILE}" | grep -i "cpuload" | cut -d':' -f2 | head -n1
fi
if [ "${METRIC}" = "uptime" ]; then
cat "${CACHE_FILE}" | grep -i "uptime" | cut -d':' -f2 | head -n1
fi
if [ "${METRIC}" = "avgreq" ]; then
cat "${CACHE_FILE}" | grep -i "ReqPerSec" | cut -d':' -f2 | head -n1
fi
if [ "${METRIC}" = "avgreqbytes" ]; then
cat "${CACHE_FILE}" | grep -i "BytesPerReq" | cut -d':' -f2 | head -n1
fi
if [ "${METRIC}" = "avgbytes" ]; then
cat "${CACHE_FILE}" | grep -i "BytesPerSec" | cut -d':' -f2 | head -n1
fi
if [ "${METRIC}" = "busyworkers" ]; then
cat "${CACHE_FILE}" | grep -i "BusyWorkers" | cut -d':' -f2 | head -n1
fi
if [ "${METRIC}" = "idleworkers" ]; then
cat "${CACHE_FILE}" | grep -i "idleworkers" | cut -d':' -f2 | head -n1
fi
if [ "${METRIC}" = "totalslots" ]; then
cat "${CACHE_FILE}" | grep -i "Scoreboard" | cut -d':' -f2 | sed -e 's/ //g' | wc -c | awk '{print $1-1}'
fi
#
exit 0
Let’s make the script file executable:
chown root:zabbix /etc/zabbix/scripts/apache2-status.sh chmod 550 /etc/zabbix/scripts/apache2-status.sh
Script validation example:
sudo -u zabbix /etc/zabbix/scripts/apache2-status.sh none accesses http://HOST/server-status
Open the zabbix agent configuration file in the editor:
sudo nano /etc/zabbix/zabbix_agentd.conf
And we will specify the following parameters:
UserParameter=apache2[*],/etc/zabbix/scripts/apache2-status.sh "none" "$1" "$2"
Some commands allow you to see the number of apache2 processes and connections to port 80, for this you do not need a script, for example, you can specify:
UserParameter=apache2.count_processes,ps aux | grep apache | wc -l UserParameter=connections_on_80_port,netstat -na | grep :80 | wc -l
Restart the zabbix agent to apply the changes:
sudo /etc/init.d/zabbix-agent restart
Let’s check:
zabbix_get -s 127.0.0.1 -k "apache2[accesses,http://HOST/server-status]"
Now we will create a template and add data elements, an example of created data items:
apache2[KEY,http://HOST/server-status]
Exported ready template – apache2-status
We also need to add a macro to the monitored host:
Macro: {$APACHE_STATS_URL}
Value: http://HOST/server-status
Done.
The number of apache2 processes can be obtained from the Zabbix agent by creating on the Zabbix server a data element with a key:
proc.num[apache2]