Re: Feature Guide: Amazon EC2 Elastic IP Addresses
Posted: Mar 27, 2008 2:06 PM PDT
Load balancing is not really a problem, assuming you do not object torunning a separate small instance to accomplish this task. This wouldessentially replace a dedicated hardware load balancer in a dedicatedhosting environment. I have made myself a build using Ubuntu 7.10(Gutsy) and HAProxy, using a standard Amazon supplied API, and it worksgreat.
Here are the specifics if you want to try it out.
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Starting with clean Linux Load of Ubuntu 7.10
apt-get update
apt-get upgrade
apt-get dist-upgrade
apt-get install joe
joe /etc/apt/sources.list
change all GUTSY to HARDY
apt-get update
apt-get install haproxy keepalived
joe /etc/apt/sources.list
change all HARDY back to GUTSY
apt-get update
cp /etc/haproxy.cfg /etc/haproxy.cfg_orig
cat /dev/null > /etc/haproxy.cfg
joe /etc/haproxy.cfg
adduser yourusername
adduser yourusername haproxy
adduser yourusername root
global
log 127.0.0.1 local0
log 127.0.0.1 local1 notice
#log loghost local0 info
maxconn 8192
#debug
#quiet
user haproxy
group haproxy
defaults
log global
mode http
option httplog
option dontlognull
retries 3
redispatch
maxconn 8192
contimeout 5000
clitimeout 50000
srvtimeout 50000
listen WebFarm *:80 #HAPROXY listens to ALL IP's Port 80
mode http
stats enable
stats auth yourusername:yourusernamespassword
balance roundrobin
cookie JSESSIONID prefix
option httpclose
option forwardfor
option httpchk *
server WebApp01 192.168.0.102:80 cookie A check #External IP Server 1
server WebApp02 192.168.0.103:80 cookie B check #External IP Server 2
joe /etc/default/haproxy
ENABLED=1 (change from 0)
joe /etc/sysctl.conf
net.ipv4.ip_nonlocal_bind=1
sysctl -p
ip addr sh eth0
killall apache2 #Just in case you did not start with a fresh build
/etc/init.d/haproxy stop
/etc/init.d/haproxy start
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Voila! You have a working load balancer in Amazon!
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To use:
-------------------- to run (assuming 67.202.17.173 is Amazon external ip address
http://67.202.17.173 # SHOWS WEBSITE
http://67.202.17.173/haproxy?stats # SHOWS HAPROXY STATS
user: yourusername
Pass: yourusernamepassword
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Youcan now configure HAProxy to load balance by one of severalmethodologies, and can monitor its effectiveness from your browser.
Hope this helps somebody out there!
Message was edited by: pivotaveracity
