Maximizing TCP connections on HAProxy load balancer

Posted by imaginative on Server Fault See other posts from Server Fault or by imaginative
Published on 2012-06-21T18:13:40Z Indexed on 2012/06/30 9:17 UTC
Read the original article Hit count: 306

Filed under:

linux

|

load-balancing

|

haproxy

|

scaling

I am currently using HAProxy in order to load balance tcp connections from clients to my Erlang app server. The connection is persistent, which means I'm limited to roughly 64K clients on an optimized server (I'm currently running HAProxy on an m1.large EC2 instance). My app server is designed to horizontally scale based on the number of TCP connections. What's worrying me though is I'll need an equal number of HAProxy servers as app servers since it's a 1:1 connection. Is there currently a way to "proxy" the tcp connection to the app server so that once HAProxy sends the client off to my Erlang server, it can free up the connection, ready to serve another client? Are there any papers, existing solutions out there I can read so that I only have to worry about the 64K limit on my app servers, and not on the load balancing servers themselves?

© Server Fault or respective owner

Related posts about linux

apt-get install and update fail

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I've got a problem with apt-get update and apt-get install ... commands . every time update or installing fails and errors are : Get:1 http://dl.google.com stable Release.gpg [198B] Ign http://dl.google.com/linux/chrome/deb/ stable/main Translation-en_US Get:2 http://dl… >>> More
kernel module compiling error

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
sh@ubuntu:/home/ccpp/helloworld$ make gcc-4.6 -O2 -DMODULE -D_KERNEL_ -W -Wall -Wstrict-prototypes -Wmissing-prototypes -isystem /lib/modules/`uname -r`/build/include -c -o hello-1.o hello-1.c hello-1.c:4:0: warning: "MODULE" redefined [enabled by default] <command-line>:0:0: note: this is… >>> More
Build-Essentials installation failing

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I am having trouble accessing the several critical header files that show to be a part of the build process. The "Ubuntu Software Center" shows "Build Essentials" as installed: Next I did the following two commands, which did not improve the problem: ~$ sudo apt-get install build-essential [sudo]… >>> More
Updating Debian kernel

as seen on Super User - Search for 'Super User'
I'm trying to update my Debian machine to 2.6.32-46 (which is the new stable). However, after doing apt-get update my apt-cache search linux-image shows me: linux-headers-2.6.32-5-486 - Header files for Linux 2.6.32-5-486 linux-headers-2.6.32-5-686-bigmem - Header files for Linux 2.6.32-5-686-bigmem linux-headers-2… >>> More
Serial connection over a single USB cable (Windows to linux, or linux to linux)

as seen on Server Fault - Search for 'Server Fault'
I'm helping out with a project for an embedded device that only has USB and no serial. This device is running Linux. These days, when we need to connect to a serial port on a device we typically use a USB to serial adapter (on something like a phone system or a load balancing device, etc). I would… >>> More

Related posts about load-balancing

Failover or load balancing configuration on Apple Xserve and Mac OS X Server Snow Leopard (10.6)

as seen on Server Fault - Search for 'Server Fault'
I'm currently installing a number of Apple Xserve boxes running Mac OS X Server (10.6). After poking and prodding for a while I can't find any obvious way, or documentation telling me how, to set up the 2 ethernet ports in a failover or load-balancing configuration. There seems to be an obvious… >>> More
Conceptually how does load-balancing on the EJB tier work in Glassfish/any ejb container

as seen on Stack Overflow - Search for 'Stack Overflow'
I am wondering conceptually how load-balancing works on the EJB-level (not web session replication) with Java EE containers like Glassfish. From what I have gleaned your remote interface is a proxy that delegates your call to one of many servers you may have in an environment. If things fail are… >>> More
Do i need a dedicated server for load balancing?

as seen on Server Fault - Search for 'Server Fault'
I'm completely new to the concept of load balancing so i hope this question isn't a "stupid question" because i've been searching around and im having a hard time understanding this. So to my understanding, in order to load balance, i need a separate machine with an ip address i can direct all traffic… >>> More
Load balancing and sessions

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi there, What is the better approach for load balancing on web servers? My services run in .NET and Mono, so they could be hosted on IIS or Apache2, and the will have to provide SSL connection. I've read two main approaches, store the state in a common server and use sticky sessions, there is any… >>> More
Loadbalancing outbound traffic while using openbgpd on freebsd

as seen on Server Fault - Search for 'Server Fault'
Hi, I am using openbgpd in freeBSD with 2 ISP connections. I have my own AS number and a /22 network. Currently I am advertising entire /22 to both networks. Inbound traffic comes in But my outbound traffic goes via a single link. I would like to either distribute my outbound traffic via both links… >>> More