Web Servers Load balancing with HAProxy

-

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 very high traffic web sites and powers quite a number of the world’s most visited ones. See more at http://haproxy.org

This tuturial, I use hostname and ip as follows:
10.11.218.250 (haproxy)
10.11.218.251 (srv-web01)
10.11.218.252 (srv-web02)

Installing HAProxy server
#yum install haproxy [RedHat Systems]
#apt-get install haproxy [Debian Systems]

Configuring HAProxy Server
Opening the main HAProxy configuration file ‘/etc/haproxy/haproxy.cfg’ and editing the following content:


#----------------------------------------------------------------

# Global settings
global


# need to:

# to have these messages end up in /var/log/haproxy.log you will
 #


# by adding the '-r' option to the SYSLOGD_OPTIONS in

# 1) configure syslog to accept network log events. This is done
 # /etc/sysconfig/syslog
 #


# /etc/sysconfig/syslog

# 2) configure local2 events to go to the /var/log/haproxy.log
 # file. A line like the following can be added to
 #
 # local2.* /var/log/haproxy.log
 #


# turn on stats unix socket

log 127.0.0.1 local2
    chroot /var/lib/haproxy
    pidfile /var/run/haproxy.pid
    maxconn 4000
    user haproxy
    group haproxy
    daemon


log                     global

stats socket /var/lib/haproxy/stats
#---------------------------------------------------------------
# Defaults settings
defaults
    mode                    http


option                  redispatch

option                  httplog
    option                  dontlognull
    option http-server-close
    option forwardfor       except 127.0.0.0/8
    retries                 3


timeout check           20

timeout http-request    20
    timeout queue           86400
    timeout connect         86400
    timeout client          86400
    timeout server          86400
    timeout http-keep-alive 30


frontend lb_in

maxconn                 50000
#----------------------------------------------------------------
#main frontend which proxys to the backends




bind *:80


default_backend lb_http



backend lb_http



balance roundrobin

mode http


server srv-web01 10.11.218.251:80 check

server srv-web02 10.11.218.252:80 check



#-------------------------- THE END -----------------------------

Restarting and verify HAProxy Load Balancer

Comments

Post a Comment

Popular posts from this blog

Install Nginx With PHP And MySQL On CentOS 7

-
Nginx is a free, open-source, high-performance HTTP server and reverse proxy, as well as an IMAP/POP3 proxy server. Nginx is known for its high performance, stability, rich feature set, simple configuration, and low resource consumption. This tutorial shows how you can install Nginx on a CentOS 7 server with PHP support (through PHP-FPM) and MySQL (Mariadb) support. In this tutorial i use hostname srv-web01.nginx.vn with the ip address 10.11.218.251. Step 1: Additional Repositories and install Nginx To get the lastest version of Nginx, we add nginx yum repository, create a file named /etc/yum.repos.d/nginx.repo  and paste one of the configurations below: [nginx] name=nginx repo baseurl=http://nginx.org/packages/centos/$releasever/$basearch/ gpgcheck=0 enabled=1 We can install as follows: yum install nginx Then we create the system startup links for nginx and start it: systemctl enable nginx.service systemctl start nginx.service And open the h...
Read more

Some common php modules

-
I often use common php modules below: php-cli : Command-line interface for PHP php-common : Common files for PHP php-dba : A database abstraction layer module for PHP applications php-devel : Files needed for building PHP extensions php-embedded : PHP library for embedding in applications php-fpm : PHP FastCGI Process Manager php-gd : A module for PHP applications for using the gd graphics library php-imap : A module for PHP applications that use IMAP php-ldap : A module for PHP applications that use LDAP php-mbstring : A module for PHP applications which need multi-byte string handling php-mysql : A module for PHP applications that use MySQL databases php-odbc : A module for PHP applications that use ODBC databases php-pdo : A database access abstraction module for PHP applications php-pear.noarch : PHP Extension and Application Repository framework php-pecl-apc : APC caches and optimizes PHP intermediate code php-pecl-apc-devel : APC developer files (header) php-pecl...
Read more

Redirect all unencrypted traffic to HTTPS in Apache

-
To redirect all HTTP traffic to HTTPS administrators are encouraged to issue a permanent redirect using the 301 status code. When using Apache this can be achieved by a setting such as the following in the Apache VirtualHosts config: <VirtualHost *:80> ServerName example.com Redirect permanent / https://example.com/ </VirtualHost>
Read more