Centos haproxy Server Load balancer

I. Topology

Ii. Install Server Load balancer Software

Wget http://haproxy.1wt.eu/download/1.4/src/haproxy-1.4.18.tar.gz
Tar zxvf haproxy-1.4.18.tar.gz
Cd haproxy-1.4.18
Uname-
Make TARGET = linux26 PREFIX =/usr/local/haproxy
Make install PREFIX =/usr/local/haproxy

3. Configure haproxy

Vi haproxy. cfg
######################################## ###############
Global
Maxconn 5120
Chroot/usr/local/haproxy
Uid 100
Gid 100
Daemon
Quiet
Nbproc 2
Pidfile/usr/local/haproxy. pid
######################################## ################

Ults
Log global
Log 127.0.0.1 local3
Mode http
Option httplog
Option dontlognull
Option redispatch
Retries 3

Maxconn 3000
Contimeout 5000
Clitimeout 50000
Srvtimeout 50000
######################################## ##################

Listen web 192.168.1.250: 80
Mode http
# Mode tcp
Balance roundrobin
Option forwardfor
Option httpclose
Option httpchk GET/index.html
Server web1 192.168.1.ight: 80 check inter 5000 fall 1 rise 2 weight 1
Server web2 192.168.1.252: 80 check inter 5000 fall 1 rise 2 weight 1
######################################## ##################

Listen status 192.168.1.250: 8080
Stats enable
Stats uri/admin
Stats auth admin: admin
Stats realm Haproxy \ statistic
######################################## ##################

################### Successfully configured haproxy ############### ##

4. Start:/usr/local/haproxy/sbin/haproxy-f/usr/local/haproxy. cfg

For ease of use, I will write a shell STARTUP script:

Vi/etc/rc. d/init. d/haproxy
#! /Bin/bash
PATH =/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/haproxy/sbin
Servername = haproxy
Serverdir =/usr/local/haproxy
Daemon =/usr/local/haproxy/sbin/haproxy
Config =/usr/local/haproxy. cfg
Pidfile =/usr/local/haproxy. pid

./Etc/rc. d/init. d/functions

Case "$1" in

Start)
$ Daemon-f $ config
Echo "......"
;;

Stop)
Server_id = 'cat $ pidfile'
Kill $ server_id
Echo "......."
;;

Restart)
$ Daemon-f $ config-p $ pidfile-sf $ (cat $ pidfile)
Echo "......."
;;

*)
Echo "Usage: $0 {start | stop | restart }"
Exit 1
Esac

######################################## ##################################

V. Test

Web1 --------> ip: 192.168.1.20.------------> index.html -------------> the is web1

Web2 --------> ip: 192.168.1.252 ------------> index.html -------------> the is web2

Background monitoring management:

When the web1 server is disconnected:

When the web1 server is restored:

################################# Some tests have been completed ### ###################

Vi. Log Configuration:

######### Add the following statement #########

Vi/etc/syslog. conf
Local3. */var/log/haproxy. log
Local0. */var/log/haproxy. log

######### Modify the following statements ##########

Vi/etc/sysconfig/syslog
SYSLOGD_OPTIONS = "-r-m 0"

########### Restart a service #############

Service syslog restart
Service haproxy restart

######################################## #####################################

Brief Introduction to the configuration file:

Maxconn 5120 ### maximum number of connections
Chroot/usr/local/haproxy ### working directory
Uid 100 ### run user uid
Gid 100 ### this is the user group
Daemon ### running in the background
Quiet ### mode used (no output at startup). You can use the debug mode.
Nbproc 2 ### instance startup settings
Pidfile/usr/local/haproxy. pid ### PID

Log 127.0.0.1 local3 ### log File
Mode http ### Use http mode, and there is also a tcp mode, which is the difference between Layer 7 and Layer 4
Option httplog ### Log Type
Retries 3 ### check the number of failed server connections

Contimeout 5000 ### connection timeout
Clitimeout 50000 ### client connection timeout
Srvtimeout 50000 ### server connection timeout

Balance roundrobin ### Algorithm
Option httpchk GET/index.html ### check page

##################### Source server ############## #######
Server web1 192.168.1.ight: 80 check inter 5000 fall 1 rise 2 weight 1
Server web2 192.168.1.252: 80 check inter 5000 fall 1 rise 2 weight 1

######################## Monitoring page ############## ############
Listen status 192.168.1.250: 8080
Stats enable
Stats uri/admin
Stats auth admin: admin
Stats realm Haproxy \ statistic

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