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Forum discussion
This how-to can be discussed on the forums here
The rational for behind this is : You have a database / source of information that you would like to graph. In this instance, I needed to see in fairly real-time, the number of http processes as well as the size of these processes.
It could be applied to a multitude of scenarios.
Getting Started
1. Find the relevant info re; http
ps -ylC httpd | awk '{x += $8;y += 1} END {print "Apache Memory Usage (MB): "x/1024; print "Average Proccess Size (MB): "x/((y-1)*1024)}' && echo -n 'current Apache Processes : ' && ps -C httpd --no-headers | wc -l
This outputs the following information;
Apache Memory Usage (MB): 1737.91 Average Proccess Size (MB): 75.5611 current Apache Processes : 23
2. Now we must create a database to hold the information -( how you name the database, table and the columns is up to you ), I'll use the following :
- Database name : apache_stats
- Table name : performance
- Columns : number, mem_used, process_size, processors_used, period
the sql is below :
-- MySQL dump 10.13 Distrib 5.1.73, for redhat-linux-gnu (x86_64) -- -- Host: localhost Database: apache_stats -- ------------------------------------------------------ -- Server version 5.1.73 /*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */; /*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */; /*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */; /*!40101 SET NAMES utf8 */; /*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */; /*!40103 SET TIME_ZONE='+00:00' */; /*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */; /*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */; /*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */; /*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */; -- -- Table structure for table `performance` -- DROP TABLE IF EXISTS `performance`; /*!40101 SET @saved_cs_client = @@character_set_client */; /*!40101 SET character_set_client = utf8 */; CREATE TABLE `performance` ( `number` int(11) NOT NULL AUTO_INCREMENT, `mem_used` int(10) unsigned NOT NULL, `process_size` int(10) unsigned NOT NULL DEFAULT '0', `processors_used` int(10) unsigned NOT NULL, `period` datetime NOT NULL DEFAULT '0000-00-00 00:00:00', PRIMARY KEY (`number`), KEY `index` (`number`) ) ENGINE=MyISAM AUTO_INCREMENT=47577 DEFAULT CHARSET=latin1; /*!40101 SET character_set_client = @saved_cs_client */; /*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */; /*!40101 SET SQL_MODE=@OLD_SQL_MODE */; /*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */; /*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */; /*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */; /*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */; /*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */; /*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */; -- Dump completed on 2015-11-26 23:35:11
Save the above into a file called : apache_memory_usage_show_to_database.sql
3. Create the database:
#mysqladmin create apache_stats
4.Prepare the collection of the relevant parameters that you want to monitor ( in this case, http stats )
create a shell script: ( apache_memory_usage_show_to_database.sh )
#/usr/bin
while true
do
LOG=outlog.txt
OUTPUT=$(ps -ylC httpd | awk '{x += $8;y += 1} END {print "Apache Memory Usage (MB): "x/1024; print ":Average Proccess Size (MB): "x/((y-1)*1024)}' && echo -n ':Apache Processes: ' && ps -C httpd --no-headers | wc -l )
DAY=$(date +"%F"+"%T")
now=$(date +'%Y-%m-%d %H:%M:%S')
echo $OUTPUT \'$DAY\' | awk '{print "INSERT INTO performance (mem_used, process_size, processors_used,period) VALUES ( "$5", "$10", "$13", "$14" );"}' | mysql --user=username --password=password database_name
sleep 120
done