Check Apache concurrent Connections using Netstat command

When your server is hitting high & overload, you might want to check, how many active connections are there and which IP take maximum of hit/connection from apache.

To Count Apache concurrent connection's, use any of the below commands.

netstat -nt | grep :80 | wc -l

netstat -plan|grep :80 | wc -l

netstat -an | grep 'EST' | wc -l

netstat -ant | grep ESTABLISHED | grep :80 | wc -l

ps -A | grep httpd | wc -l

ps -ef | grep http | wc -l

ps aux | grep httpd | wc -l

ps aux | grep http | grep -v "\(root\|grep\)" | wc -l

To print the active Internet connections to the server at port 80 and sort the results, use the below commands.

netstat -an | grep :80 | sort
or
netstat -plan | grep :80
or
netstat -anp | grep :80

To calculate and count, number of connection currently established from each IP address with server.

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

To calculate and count, number of connection currently established from each IP address through TCP or UDP protocol with server.

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

To Print ESTABLISHED connections instead of all connections, and displays the connections count for each IP

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

To print the list of IP address and its connection count, that connect to 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 httpd actual processes in Linux, use the below commands.

ps -aux | grep httpd
or
ps -ef | grep httpd

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