Port Exhaustion - SQL

Brandon Mallory brandonm at medent.com
Thu May 16 15:12:54 UTC 2019

The programmers currently use a file to specify the IP of the remote SQL server. As a work around for the time being I have added a 2nd interface to the front end server and the remote SQL server. 

These are the errors we get when we hit the 65k limit. 
mysqli_connect(): Can't connect to MySQL server on '' (99) 

Front end 

Remote SQL 

There is a file where I can specify which IP to use ( or wrote a script to change that IP when we hit 30k connections. 

COUNT=`netstat -an | grep $SQLIP | wc -l` 

if [ "$SQLIP" = "" ];then 

if [ $COUNT -gt 30000 ];then 
echo "$FLIP" > /MYSQL_HOST 
COUNTFLIP=`netstat -an | grep $FLIP | wc -l` 
echo "$SQLIP Hit $COUNT switching IP to $FLIP with $COUNTFLIP connections - $(date)" >> $LOG 

There just seems like a better way to have something else "load balance" between 2 lan IP's. 

Best Regards, 
Brandon Mallory 
Network & Systems Engineer 
15 Hulbert Street 
Auburn, NY 13021 
Phone: [ callto:(315)-255-0900 | (315)-255-0900 ] 
Fax: [ callto:(315)-255-3539 | (315)-255-3539 ] 
Web: [ http://www.medent.com/ | www.medent.com ] 

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From: "Reinis Rozitis" <r at roze.lv> 
To: "nginx" <nginx at nginx.org> 
Sent: Thursday, May 16, 2019 10:38:43 AM 
Subject: RE: Port Exhaustion - SQL 

Ohh I missed the whole idea that nginx is used as tcp balancer for mysql. 

But imo it is still more simple (unless you can't do anything with the DB server) to balance the remote server rather than split and bind local clients: 

upstream backend { 
server ip1:3306; 
server ip2:3306; 
server ip3:3306; 


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