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
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
tar xvfz haproxy-1.5-dev7.tar.gz
$ cd haproxy-1.5-dev7
Now we have to compile the installation file, we are taking example of centost OS
Now make a new directory and copy haproxy configuration file there
change the ip address below and copy it to haproxy.cfg
maxconn 20000 # count about 1 GB per 20000 connections
stats socket /var/run/haproxy.stat mode 600
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 forwardfor # set the client’s IP in X-Forwarded-For.
# 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
# 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.
# Uncomment “disabled” below to disable the stats page :
stats uri /
In the above file replace 192.168.1.1 to 192.168.1.4 with your server ip address.
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.
haproxy -f /etc/haproxy/haproxy.cfg
Now we have to check if its working. Go to your stats page to see
Replace serverip with your server ip used in configuration file and you will see full result generated by haproxy