Simple Linux load balancing behind one public IP

categories:

• Linux
• Security

Balance would help you setting up a SIMPLE load balanced cluster. It will balance equally between nodes, which could still lead to troubles, if one machine is much slower/busier than the other. It only manages 16 connections per nodes and 16 nodes. If you want something more powerful, take a look at IPVSADM

http://www.inlab.de/balance.html http://dag.wieers.com/packages/balance/

Example :

Machine A : Director / Load Balancer

IP : 10.1.20.254

Start balance using this command : balance 80 10.1.20.1 10.1.20.2

Type : balance -i 80 then “show”

This will show you some stats

Machine B : Node 1 / Web Server

IP : 10.1.20.1

Machine C : Node 2 / Web Server

IP : 10.1.20.2

**Balance usage : **

balance [-b addr] [-B addr] [-t sec] [-T sec] [-adfpHM] port [h1[:p1[:maxc1]] [!%] [ … hN[:pN[:maxcN]]]] balance [-b addr] -i [-d] port balance [-b addr] -c cmd [-d] port

-a enable channel autodisable option -b host bind to specific address on listen -B host bind to specific address for outgoing connections -c cmd execute specified interactive command -d debugging on -f stay in foregound -i interactive control -H failover even if Hash Type is used -M use MMAP instead of SHM for IPC -p packetdump -t sec specify connect timeout in seconds (default=5) -T sec timeout (seconds) for select (0 => never) (default=0) ! separates channelgroups (declaring previous to be Round Robin) % as !, but declaring previous group to be a Hash Type

More info : http://www.linux.com/article.pl?sid=05/07/27/1729229