Haproxy Deploying a Web site lb cluster

Introduction: The difference between LVS and Haproxy

Lvs:

1, strong anti-load capacity, is the work in the Network 4 layer on the distribution only, no flow generation;

2, no flow, to ensure that the performance of the Equalizer IO will not receive the impact of large traffic;

3, the application of a wide range, because LVS work in the 4 layer, so it can almost all applications to do load balancing

4, the work is stable, because of its own resistance to load capacity is very strong, self has a complete dual-machine hot-Standby program,

such as lvs+keepalived, but we in the project implementation of the most used is still lvs/dr+keepalived.

Haproxy:

1, Haproxy is also supporting the virtual host

Haproxy similar to LVS, itself is just a load balancer software, based on seven layers;

2, simply from the efficiency of the haproxy will be better than nginx load balancing speed,

In the concurrent processing is also superior to nginx;

3, Haproxy support the TCP protocol load-balanced forwarding,

MySQL reads can be load balanced, and backend MySQL nodes are detected and load balanced

Preparatory work:

1. Prepare four hosts: IP address planning is

4.49,4.50 (Haproxy), 4.51 (web), 4.52 (web)

2, install Haproxy Software on 4.50, on 4.51 and 4.52

Installing HTTPD Software

I. Common LB cluster

1, modify the configuration file: Vim/etc/haproxy/haproxy.cfg

Delete all content below 60 lines, add the following content

Stats Uri/admin

Listen Lbweb 0.0.0.0:80

ServerID Cookie Rewrite

Balance Roundrobin

web51 192.168.4.51:80 Cookie App51 check Inter 2 rise 5

Server web52 192.168.4.52:80 Cookie app52 check Inter 2 rise 5

2, can go to Page view Health: Http://192.168.4.50/admin

3. Test: Stop one of the Web servers and go back to the background to view the number of session sessions in the background

II. Division of Business-differentiated lb clusters

1. Test with four servers

4.51 and 4.52 do HTML load, 4.53 and 4.54 do PHP load

2, above 4.51 and 4.52 have done, now put 4.53 and 4.54 do PHP website

3. Modify configuration file: Vim/etc/haproxy/haproxy.cfg

Stats Uri/admin

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

# main frontend which proxys to the backends

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

Frontend weblb 192.168.4.100:80

# ACL url_static path_beg-i/static/images/javascript/stylesheets

path_html ACL path_end-i. html

path_php ACL path_end-i. php

67

Use_backend HTMLG If path_html

Use_backend PHPG If path_php

Default_backend HTMLG

71

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

# Static backend for serving up images, stylesheets and such

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

#backend Static

# balance Roundrobin

# # server static 127.0.0.1:4331 check

78

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

# round robin balancing between the various backends

Bayi #---------------------------------------------------------------------

Backend HTMLG

Balance Roundrobin

Server app101 192.168.4.101:80 Check

app102 192.168.4.102:80 Check

86

Backend PHPG

Balance Roundrobin

192.168.4.103:80 Check for app103 server

Server app104 192.168.4.104:80 Check

4, save the configuration, restart the service, test:

Put test.html and test.php Web files on four servers, respectively.

Test separately on the client side to produce the expected results

Haproxy Deploying a Web site lb cluster