Installing Haproxy For Load Balancing And Protecting Apache

HAProxy is a free, very fast and reliable solution offering high availability, load balancing, and proxying for TCP and HTTP-based applications. It is particularly suited for web sites crawling under very high loads while needing persistence or Layer7 processing. Supporting tens of thousands of connections is clearly realistic with today’s hardware. Its mode of operation makes its integration into existing architectures very easy and risk less, while still offering the possibility not to expose fragile web servers to the Net You can read more here:- http://haproxy.1wt.eu/#desc

Installing HAProxy:-
You can check for the latest version here:- http://haproxy.1wt.eu/#down
At present 1.5 is in development phase 7 and we are going to use that

Note: The configuration file we have used is for single server Protection not for multiple server and made by its owner Willy Tarreau

First:-

wget http://haproxy.1wt.eu/download/1.5/src/devel/haproxy-1.5-dev7.tar.gz
tar xvfz haproxy-1.5-dev7.tar.gz
$ cd haproxy-1.5-dev7

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Second:-
Now we have to compile the installation file, we are taking example of centost OS make install

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Third:-
Now make a new directory and copy haproxy configuration file there

mkdir /etc/haproxy
cd /etc/haproxy
vi haproxy.cfg

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change the ip address below and copy it to haproxy.cfg
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global
daemon
maxconn 20000 # count about 1 GB per 20000 connections
pidfile /var/run/haproxy.pid
stats socket /var/run/haproxy.stat mode 600
defaults
mode http
maxconn 19500 # Should be slightly smaller than global.maxconn.
timeout client 60s # Client and server timeout must match the longest
timeout server 60s # time we may wait for a response from the server.
timeout queue 60s # Don’t queue requests too long if saturated.
timeout connect 4s # There’s no reason to change this one.
timeout http-request 5s # A complete request may never take that long.
# Uncomment the following one to protect against nkiller2. But warning!
# some slow clients might sometimes receive truncated data if last
# segment is lost and never retransmitted :
# option nolinger
option http-server-close
option abortonclose
balance roundrobin
option forwardfor # set the client’s IP in X-Forwarded-For.
option tcp-smart-accept
option tcp-smart-connect
retries 2
frontend public
bind 192.168.1.1:80
bind 192.168.1.2:80
bind 192.168.1.3:80
bind 192.168.1.4:80
# table used to store behaviour of source IPs
stick-table type ip size 200k expire 5m store gpc0,conn_rate(10s)
# IPs that have gpc0 > 0 are blocked until the go away for at least 5 minutes
acl source_is_abuser src_get_gpc0 gt 0
tcp-request connection reject if source_is_abuser
# connection rate abuses get blocked
acl conn_rate_abuse sc1_conn_rate gt 30
acl mark_as_abuser sc1_inc_gpc0 gt 0
tcp-request connection track-sc1 src
tcp-request connection reject if conn_rate_abuse mark_as_abuser
default_backend apache
backend apache
# set the maxconn parameter below to match Apache’s MaxClients minus
# one or two connections so that you can still directly connect to it.
stats uri /haproxy?stats
server srv 0.0.0.0:8181 maxconn 254
# Enable the stats page on a dedicated port (8888). Monitoring request errors
# on the frontend will tell us how many potential attacks were blocked.
listen stats
# Uncomment “disabled” below to disable the stats page :
# disabled
bind :8811
stats uri /
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In the above file replace 192.168.1.1 to 192.168.1.4 with your server ip address.

Fourth:
Change your Apache port to 8181 as in configuration file we are using that server srv 0.0.0.0:8181 maxconn 254.In WHM goto Tweak Settings and find Apache non-SSL IP/port and change it to 8181.
Fifth:
Restart apache

/etc/init.d/apache2 restart

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Last:
Start haproxy

haproxy -f /etc/haproxy/haproxy.cfg

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Now we have to check if its working. Go to your stats page to see
serverip:8811

Replace serverip with your server ip used in configuration file and you will see full result generated by haproxy
If you are facing any issue then feel free to contact us

Article Soruce:- http://www.bullten.com/installing-haproxy-for-anonymous-attacks-and-load-balancing/

 

What solution was used to keep the data replicated across the load balancing servers?

 

@Bullten nice sharing, thanks, but when I checked 1 year ago, HAProxy was not fully supporting HTTP/1.1, Nginx does that is why I prefer it.

@JamesZach it differs according to the data type, MySQL, files, web-sessions, ....

 

the owner of this software worked alot and he is updating haproxy very often. I say this software will give equal competition to nginix

 

well its databse server