How to configure Apache Concurrent Connections on Apache Server for Maximum Concurrent Connections

Deepak Kumar Thakur
4 min readSep 25, 2021


Apache Performance Tuning

Apache 2.x is a broadly useful webserver intended to adjust adaptability, conveyability, and execution. Despite the fact that it has not been planned explicitly to establish benchmark standards, Apache 2.x can perform elite in some certifiable circumstances for apache server configuration.

Contrasted with Apache 1.3, discharge 2.x contains numerous extra advancements to build throughput and adaptability. The greater part of these enhancements are empowered as a matter of course. In any case, there are gather time and run-time design decisions that can essentially influence execution. MPM tuning is one of the redesigns that has been made in apache 2.x.

What are MPM’s

· It adjusts the essential usefulness of the apache server identified with multi-string and multi-measures way of working.

· It should be incorporated into apache at assemblage with http_core and mod_so modules.

· Only one MPM can be stacked into the worker whenever.

Choosing an MPM

Apache 2.x backings pluggable simultaneousness models, called Multi-Processing Modules (MPMs). When building Apache connections, you should pick a MPM to utilize. There are stage explicit MPMs for certain stages: beos, mpm_netware, mpmt_os2, and mpm_winnt. For general Unix-type frameworks, there are a few MPMs from which to pick. The decision of MPM can influence the speed and versatility of the httpd. There are typically 2 sorts of Mpm’s. These days individuals will in general introduce apache 2.x that clients laborer MPM.

Various kinds of MPM

There are 2 kinds of MPM’s



The main orders used to control this MPM are ThreadsPerChild, which controls the quantity of strings sent by every kid cycle, and MaxClients, which controls the greatest complete number of strings that might be dispatched.

How it works

Ordinarily, I necessitate that I need my apache to serve numerous simultaneous clients. Every client can fire a solitary solicitation to an apache worker, or a solitary client can terminate many solicitations model, where a page is mentioning many picture/javascript/css documents. So presently I need to build this number.

This is the default laborer mpm arrangement and I will tell, how to change boundaries with expanding number of apache concurrent connections/requests/users

ServerLimit 16

StartServers 2

MaxClients 150

MinSpareThreads 25

MaxSpareThreads 75

ThreadsPerChild 25

Hardware and Operating System Issues with apache

The single greatest equipment issue influencing webserver execution is RAM. A webserver ought to never need to trade, as trading expands the inactivity of each solicitation past a point that clients consider “fast enough.” This makes clients hit pause and reload, further expanding the heap. You can, and ought to, control the MaxClients setting so your worker doesn’t generate such countless youngsters it begins trading. This strategy for doing this is basic: decide the size of your normal Apache measure by taking a gander at your cycle list through an apparatus like top, and separation this into your complete accessible memory, leaving some space for different cycles.

Check Apache simultaneous Connections utilizing Netstat order

At the point when your worker is hitting high and over-burden, you should check, the number of dynamic associations are there and which IP take limit of hit/association from apache.

To Count Apache concurrent connection’s, utilization any of the underneath commands.

netstat -nt | grep :80 | wc -lnetstat -plan|grep :80 | wc -lnetstat -an | grep 'EST' | wc -lnetstat -ant | grep ESTABLISHED | grep :80 | wc -lps -A | grep httpd | wc -lps -ef | grep http | wc -lps aux | grep httpd | wc -lps aux | grep http | grep -v "\(root\|grep\)" | wc -l

To print the dynamic Internet associations with the worker at port 80 and sort the outcomes, utilize the beneath commands.

netstat -an | grep :80 | sortornetstat -plan | grep :80ornetstat -anp | grep :80

To compute and count, number of association as of now settled from every IP address with server.

netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n

To ascertain and count, number of association presently settled from every IP address through TCP or UDP convention with server.

netstat -anp |grep 'tcp\|udp' | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n

To Print ESTABLISHED associations rather than all associations, and showcases the associations count for every IP

netstat -ntu | grep ESTAB | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -nr

To print the rundown of IP address and its association count, that interface with port 80 on the server.

netstat -plan|grep :80|awk {'print $5'}|cut -d: -f 1|sort|uniq -c|sort -nk 1

To print all the apache https genuine cycles in Linux, utilize the underneath command.

ps -aux | grep httpdorps -ef | grep httpd

To get overseen linux and windows cloud worker by, Linux Cloud Server and Windows Cloud Server uses the Apache HTTP web server, which is at present being enhanced with Nginx web server for better execution.



Deepak Kumar Thakur

I am skilled in Search Engine Optimization (SEO), Social Media, Web Design, and Online Advertising.