haproxy的web服务负载均衡、动静分离、 MySQL服务负载均衡、状态监控
实验环境：基于centos6.6haproxy-Server：172.16.249.98hostname:node1
upsteram server1：172.16.249.100 hostname:node2
upstream server2：172.16.249.99hostname:node3
web服务的负载均衡以及状态监控：
设置记录haproxy日志的文件位置：
node1:
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#vim /etc/rsyslog.conf
(1)启用UDP：
# Provides UDP syslog reception
$ModLoad imudp
$UDPServerRun 514
(2)添加记录日志的文件位置
# Save boot messages also to boot.log
local7.* /var/log/boot.log
local2.* /var/log/haproxy.log
#service rsyslog restart
node1:
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#yum install haproxy -y
#cd /etc/haproxy/
#cp haproxy.cfg{,.bak}
#vim haproxy.cfg
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#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
global
# to have these messages end up in /var/log/haproxy.log you will
# need to:
#
# 1) configure syslog to accept network log events.This is done
# by adding the '-r' option to the SYSLOGD_OPTIONS in
# /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
# /etc/sysconfig/syslog
#
# local2.* /var/log/haproxy.log
#
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
defaults
mode http
log global
option httplog
option dontlognull
option http-server-close
option forwardfor except 127.0.0.0/8
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
timeout check 10s
maxconn 30000
listen stats #此段为设置状态监控
mode http
bind :8888 #生产环境中为保证安全性，为设置特殊端口，例如：8888
stats enable
stats hide-version
stats uri /haproxyadmin?stats
stats realm Haproxy\ Statistics
stats auth admin:admin #设置用户名以及密码
stats admin if TRUE
frontend http-in
bind *:80
mode http
log global
option httpclose
option logasap
option dontlognull
capture requestheader Host len 20
capture requestheader Referer len 60
default_backend servers
frontend healthcheck
bind :1099
mode http
option httpclose
option forwardfor
default_backend servers
backend servers
balance roundrobin
server node2 172.16.249.100:80 check maxconn 2000
server node3 172.16.249.99:80 check maxconn 2000
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#serivce haproxy start
node2,node3节点分别建立测试页面，并启动httpd服务;
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node2:#vim /var/www/html/index.html
<h1> httpd on node2 </h1>
#service httpd start
node3:#vim /var/www/html/index.html
<h1> httpd on node3 </h1>
#service httpd start
打开浏览器：172.16.249.98:
打开浏览器：172.16.249.98:8888/haproxy?stats
动静分离配置：
#vim /etc/haproxy/haproxy.cfg
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#---------------------------------------------------------------------
global
# to have these messages end up in /var/log/haproxy.log you will
# need to:
#
# 1) configure syslog to accept network log events.This is done
# by adding the '-r' option to the SYSLOGD_OPTIONS in
# /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
# /etc/sysconfig/syslog
#
# local2.* /var/log/haproxy.log
#
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
# turn on stats unix socket
stats socket /var/lib/haproxy/stats
defaults
mode http
log global
option httplog
option dontlognull
option http-server-close
option forwardfor except 127.0.0.0/8
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
timeout check 10s
maxconn 3000
frontendmain *:80
acl url_static path_beg -i /static /images /javascript /stylesheets
acl url_static path_end -i .jpg .gif .png .css .js .html .txt .htm
use_backend static if url_static
default_backend app
backend static
balance roundrobin
server node2 172.16.249.100:80 check
backend app
balance roundrobin
server node3 172.16.249.99:80 check
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#serivce haproxy start #启动haproxy服务
所有静态页面请求代理至node2节点；所有动态页面请求代理至node3节点。
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node2:#vim /var/www/html/index.html
<h1> httpd on node2 </h1>
#service httpd start
node3:#vim /var/www/html/index.php
<?php
phpinfo();
?>
#service httpd start
打开浏览器：172.16.249.98/index.html
打开浏览器：172.16.249.98/index.php
负载均衡mysql服务：
node1：#yum install mysql -y
#vim /etc/haproxy/haproxy.cfg
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#---------------------------------------------------------------------
global
# to have these messages end up in /var/log/haproxy.log you will
# need to:
#
# 1) configure syslog to accept network log events.This is done
# by adding the '-r' option to the SYSLOGD_OPTIONS in
# /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
# /etc/sysconfig/syslog
#
# local2.* /var/log/haproxy.log
#
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
# turn on stats unix socket
stats socket /var/lib/haproxy/stats
defaults
mode tcp
log global
option dontlognull
option http-server-close
#option forwardfor except 127.0.0.0/8
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
timeout check 10s
maxconn 3000
frontend bd
bind :3306
default_backend dbsrvs
backend dbsrvs
balance leastconn
server node2 172.16.249.100:3306 check
server node3 172.16.249.99:3306 check
listen stats
bind :80
mode http
stats enable
stats uri /haproxy?stats
stats realm haproxy\ stats
stats auth admin:admin
stats admin if TRUE
分别在node2、node3节点建立数据库，并授权可远程连接：
node2:#yum install mysql-server -y
#serivce mysqld start
#mysql
node3:#yum install mysql-server -y
#serivce mysqld start
#mysql
node1:#service haproxy restart #重启服务，配置文件才能生效
#mysql -uroot -h172.16.249.98 -pmageedu
检测：
node2：#mysql -uroot -pmageedu
node3:#mysql -uroot -pmageedu;
说明：由于我们在node1节点调用了数据库并创建了表，node2节点查看有此表，node3节点无此表，因此我们刚才的测试中调用了node2节点的mysql数据库而非node3节点。
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