一、Haproxy的简介
Haproxy的官网站点：http://haproxy.com/
HAProxy提供高可用性、负载均衡以及基于TCP和HTTP应用的代 理，支持虚拟主机，它是免费、快速并且可靠的一种解决方案。HAProxy特别适用于那些负载特大的web站点，这些站点通常又需要会话保持或七层处理。HAProxy运行在当前的硬件上，完全可以支持数以万计的并发连接。并且它的运行模式使得它可以很简单安全的整合进您当前的架构中， 同时可以保护你的web服务器不被暴露到网络上。
HAProxy实现了一种事件驱动, 单一进程模型，此模型支持非常大的并发连接数。多进程或多线程模型受内存限制 、系统调度器限制以及无处不在的锁限制，很少能处理数千并发连接。事件驱动模型因为在有更好的资源和时间管理的用户端(User-Space) 实现所有这些任务，所以没有这些问题。此模型的弊端是，在多核系统上，这些程序通常扩展性较差。这就是为什么他们必须进行优化以 使每个CPU时间片(Cycle)做更多的工作。
二、Haproxy的工作模式
大致的意思就是：可以分为两部分，
第一部分是互联网，包括互联网上众多的路由设备、Firewall等；
第二部分是本地的网络架构，包括Firewall，proxy、Web server，Database等
Haproxy的注释Local balanceer in proxy mode -- 工作在代理模下是一个负载均衡的功能
通过Haproxy代理后端的Web server群集，如果需要与数据库交互，有Web server与Database建立连接。
三、Haproxy的安装和配置说明
CentOS 6.5系统中yum源提供的Haproxy的版本为1.5.18，在这里我们直接用yum安装
1、安装haproxy
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yum install haproxy -y
rpm -ql haproxy #可以查看yum安装Haproxy生成了哪些文件
/etc/haproxy/etc/haproxy/haproxy.cfg #haproxy的配置文件
/etc/logrotate.d/haproxy
/etc/rc.d/init.d/haproxy #haproxy的服务脚本文件
/etc/sysconfig/haproxy/usr/bin/halog/usr/bin/iprange/usr/sbin/haproxy/usr/share/doc/haproxy-1.5.18
/usr/share/doc/haproxy-1.5.18/CHANGELOG
/usr/share/doc/haproxy-1.5.18/LICENSE
/usr/share/doc/haproxy-1.5.18/README
/usr/share/doc/haproxy-1.5.18/acl-content-sw.cfg
/usr/share/doc/haproxy-1.5.18/acl.fig
/usr/share/doc/haproxy-1.5.18/architecture.txt
/usr/share/doc/haproxy-1.5.18/close-options.txt
/usr/share/doc/haproxy-1.5.18/coding-style.txt
/usr/share/doc/haproxy-1.5.18/configuration.txt
/usr/share/doc/haproxy-1.5.18/content-sw-sample.cfg
/usr/share/doc/haproxy-1.5.18/cookie-options.txt
/usr/share/doc/haproxy-1.5.18/cttproxy-src.cfg
/usr/share/doc/haproxy-1.5.18/design-thoughts
/usr/share/doc/haproxy-1.5.18/design-thoughts/backends-v0.txt
/usr/share/doc/haproxy-1.5.18/design-thoughts/backends.txt
/usr/share/doc/haproxy-1.5.18/design-thoughts/be-fe-changes.txt
/usr/share/doc/haproxy-1.5.18/design-thoughts/binding-possibilities.txt
/usr/share/doc/haproxy-1.5.18/design-thoughts/buffer-redesign.txt
/usr/share/doc/haproxy-1.5.18/design-thoughts/buffers.fig
/usr/share/doc/haproxy-1.5.18/design-thoughts/config-language.txt
/usr/share/doc/haproxy-1.5.18/design-thoughts/connection-reuse.txt
/usr/share/doc/haproxy-1.5.18/design-thoughts/cttproxy-changes.txt
/usr/share/doc/haproxy-1.5.18/design-thoughts/entities-v2.txt
/usr/share/doc/haproxy-1.5.18/design-thoughts/how-it-works.txt
/usr/share/doc/haproxy-1.5.18/design-thoughts/http_load_time.url
/usr/share/doc/haproxy-1.5.18/design-thoughts/rate-shaping.txt
/usr/share/doc/haproxy-1.5.18/design-thoughts/sess_par_sec.txt
/usr/share/doc/haproxy-1.5.18/gpl.txt
/usr/share/doc/haproxy-1.5.18/haproxy-en.txt
/usr/share/doc/haproxy-1.5.18/haproxy-fr.txt
/usr/share/doc/haproxy-1.5.18/haproxy.1
/usr/share/doc/haproxy-1.5.18/haproxy.cfg
/usr/share/doc/haproxy-1.5.18/internals
/usr/share/doc/haproxy-1.5.18/internals/acl.txt
/usr/share/doc/haproxy-1.5.18/internals/body-parsing.txt
/usr/share/doc/haproxy-1.5.18/internals/buffer-operations.txt
/usr/share/doc/haproxy-1.5.18/internals/buffer-ops.fig
/usr/share/doc/haproxy-1.5.18/internals/connect-status.txt
/usr/share/doc/haproxy-1.5.18/internals/connection-header.txt
/usr/share/doc/haproxy-1.5.18/internals/connection-scale.txt
/usr/share/doc/haproxy-1.5.18/internals/entities.fig
/usr/share/doc/haproxy-1.5.18/internals/entities.pdf
/usr/share/doc/haproxy-1.5.18/internals/entities.svg
/usr/share/doc/haproxy-1.5.18/internals/entities.txt
/usr/share/doc/haproxy-1.5.18/internals/hashing.txt
/usr/share/doc/haproxy-1.5.18/internals/header-parser-speed.txt
/usr/share/doc/haproxy-1.5.18/internals/header-tree.txt
/usr/share/doc/haproxy-1.5.18/internals/http-cookies.txt
/usr/share/doc/haproxy-1.5.18/internals/http-docs.txt
/usr/share/doc/haproxy-1.5.18/internals/http-parsing.txt
/usr/share/doc/haproxy-1.5.18/internals/naming.txt
/usr/share/doc/haproxy-1.5.18/internals/pattern.dia
/usr/share/doc/haproxy-1.5.18/internals/pattern.pdf
/usr/share/doc/haproxy-1.5.18/internals/polling-states.fig
/usr/share/doc/haproxy-1.5.18/internals/repartition-be-fe-fi.txt
/usr/share/doc/haproxy-1.5.18/internals/sequence.fig
/usr/share/doc/haproxy-1.5.18/internals/stats-v2.txt
/usr/share/doc/haproxy-1.5.18/internals/stream-sock-states.fig
/usr/share/doc/haproxy-1.5.18/internals/todo.cttproxy
/usr/share/doc/haproxy-1.5.18/lgpl.txt
/usr/share/doc/haproxy-1.5.18/proxy-protocol.txt
/usr/share/doc/haproxy-1.5.18/queuing.fig
/usr/share/doc/haproxy-1.5.18/tarpit.cfg
/usr/share/doc/haproxy-1.5.18/url-switching.cfg
/usr/share/haproxy/usr/share/haproxy/400.http #400错误的状态码页面
/usr/share/haproxy/403.http #403错误的状态码页面
/usr/share/haproxy/408.http #408错误的状态码页面
/usr/share/haproxy/500.http #500错误的状态码页面
/usr/share/haproxy/502.http #502错误的状态码页面
/usr/share/haproxy/503.http #503错误的状态码页面
/usr/share/haproxy/504.http #504错误的状态码页面
/usr/share/haproxy/README/usr/share/man/man1/halog.1.gz #可以直接使用man halog查看命令的使用语法
/usr/share/man/man1/haproxy.1.gz #可以直接使用man haproxy查看命令的使用语法
/var/lib/haproxy |
2、haproxy的配置文件说明
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# cd /etc/haproxy/# cp haproxy.cfg haproxy.cfg.bak# vim haproxy.cfg**********************************************************************#---------------------------------------------------------------------# Example configuration for a possible web application. See the# full configuration options online.## http://haproxy.1wt.eu/download/1.4/doc/configuration.txt##--------------------------------------------------------------------- #---------------------------------------------------------------------# Global settings #---------------------------------------------------------------------global #全局配置文件
# to have these messages end up in /var/log/haproxy.log you will
# need to: #配置日志
#
# 1) configure syslog to accept network log events. This is done
# by adding the '-r' option to the SYSLOGD_OPTIONS in
# /etc/sysconfig/syslog #修改syslog配置文件
#
# 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 #定义日志设备
#
# local2.* /var/log/haproxy.log
#
log 127.0.0.1 local2 #日志配置，所有的日志都记录本地，通过local2输出
chroot /var/lib/haproxy #改变haproxy的工作目录
pidfile /var/run/haproxy.pid #指定pid文件的路径
maxconn 4000 #最大连接数的设定
user haproxy #指定运行服务的用户
group haproxy #指定运行服务的用户组
daemon
# turn on stats unix socket
stats socket /var/lib/haproxy/stats
#---------------------------------------------------------------------# common defaults that all the 'listen' and 'backend' sections will# use if not designated in their block#---------------------------------------------------------------------defaults mode http #默认使用协议,可以为{http|tcp|health} http:是七层协议 tcp:是四层 health：只返回OK
log global #全局日志记录
option httplog #详细记录http日志
option dontlognull #不记录空日志
option http-server-close #启用http-server-close
option forwardfor except 127.0.0.0/8 #来自这些信息的都不forwardfor
option redispatch #重新分发，ServerID对应的服务器宕机后，强制定向到其他运行正常的服务器
retries 3 #3次连接失败则认为服务不可用
timeout http-request 10s #默认http请求超时时间
timeout queue 1m #默认队列超时时间
timeout connect 10s #默认连接超时时间
timeout client 1m #默认客户端超时时间
timeout server 1m #默认服务器超时时间
timeout http-keep-alive 10s #默认持久连接超时时间
timeout check 10s #默认检查时间间隔
maxconn 3000 #最大连接数
#---------------------------------------------------------------------# main frontend which proxys to the backends#---------------------------------------------------------------------frontend main *:5000 #定义ACL规则以如".html"结尾的文件；-i：忽略大小写
acl url_static path_beg -i /static /images /javascript /stylesheets
acl url_static path_end -i .jpg .gif .png .css .js
use_backend static if url_static #调用后端服务器并检查ACL规则是否被匹配
default_backend app #客户端访问时默认调用后端服务器地址池
#---------------------------------------------------------------------# static backend for serving up images, stylesheets and such#---------------------------------------------------------------------backend static #定义后端服务器
balance roundrobin #定义算法;基于权重进行轮询
server static 127.0.0.1:4331 check check:启动对后端server的健康状态检测
#---------------------------------------------------------------------# round robin balancing between the various backends#---------------------------------------------------------------------backend app balance roundrobin
server app1 127.0.0.1:5001 check
server app2 127.0.0.1:5002 check
server app3 127.0.0.1:5003 check
server app4 127.0.0.1:5004 check
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3、haproxy的命令详解
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# haproxy -hHA-Proxy version 1.5.18 2016/05/10
Copyright 2000-2016 Willy Tarreau <willy@haproxy.org>Usage : haproxy [-f <cfgfile>]* [ -vdVD ] [ -n <maxconn> ] [ -N <maxpconn> ] [ -p <pidfile> ] [ -m <max megs> ] [ -C <dir> ]
-v displays version ; -vv shows known build options.
-d enters debug mode ; -db only disables background mode.
-dM[<byte>] poisons memory with <byte> (defaults to 0x50)
-V enters verbose mode (disables quiet mode)
-D goes daemon ; -C changes to <dir> before loading files.
-q quiet mode : don't display messages
-c check mode : only check config files and exit
-n sets the maximum total # of connections (2000)
-m limits the usable amount of memory (in MB)
-N sets the default, per-proxy maximum # of connections (2000)
-L set local peer name (default to hostname)
-p writes pids of all children to this file
-de disables epoll() usage even when available
-dp disables poll() usage even when available
-dS disables splice usage (broken on old kernels)
-dV disables SSL verify on servers side
-sf/-st [pid ]* finishes/terminates old pids. Must be last arguments.
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4、配置Haproxy的日志
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默认情况下，Haproxy没有启用日志文件，但是我们可以根据haproxy的配置文件做修改。(1)修改系统日志的配置文件# vim /etc/sysconfig/rsyslogSYSLOGD_OPTIONS="-c 2 -r"
(2)增加日志设备# vim /etc/rsyslog.conf local2.* /var/log/haproxy.log
(3)重启一下日志服务# /etc/init.d/rsyslog restart关闭系统日志记录器： [确定]启动系统日志记录器： [确定](4)查看日志记录信息# tail -f /var/log/haproxy.log |
四、Haproxy负载均衡web
1、一个配置示例：
Haproxy-Server：10.10.172.195
Apache1-Client：10.10.172.196
Apache2-Client：10.10.172.197
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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 mode http
bind 0.0.0.0:8080
stats enable
stats hide-version
stats uri /haproxyadmin?stats
stats realm Haproxy\ Statistics
stats auth admin:123456
stats admin if TRUE
frontend http-in
bind *:80
mode http
log global
option httpclose
option logasap
option dontlognull
capture request header Host len 20
capture request header Referer len 60
default_backend servers
frontend healthcheck bind :1099
mode http
option httpclose
option forwardfor
default_backend servers
backend servers balance roundrobin
server websrv1 10.10.172.196:80 check maxconn 2000
server websrv2 10.10.172.197:80 check maxconn 2000
********************************************************************** |
2、启动Haproxy服务
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# service haproxy startStarting haproxy: [ OK ]# chkconfig haproxy on |
3、浏览器访问
单独访问Apache1：10.10.172.196
单独访问Apache2：10.10.172.197
多次刷新访问Haproxy：10.10.172.195
多次刷新Haproxy的website，会切换到后端不同的webserver主机上。
五、Haproxy的状态监控
1、Haproxy的监控页面
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listen stats #关联前端和后端定义一个完整的代理
mode http #设置代理协议
bind 0.0.0.0:8080 #绑定相应的端口
stats enable #开启Haproxy统计状态
stats refresh 3s #统计页面自动刷新时间间隔
stats hide-version #隐藏代理服务器版本
stats uri /haproxyadmin?stats #访问的url
stats realm Haproxy\ Statistics #统计页面认证时提示内容信息
stats auth admin:123456 #设置登录用户和密码
stats admin if TRUE #如果认证通过，则就可以打开stats
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2、访问监控页面
(1)登陆监控页面
admin/123456
(2)查看监控页面
(3)模拟一下故障
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# service httpd stopStopping httpd: [ OK ] |
(4)在次查看监控页面
六、Haproxy的动静分离
haproxy动静分离的配置
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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 mode http
bind 0.0.0.0:1080
stats enable
stats hide-version
stats uri /haproxyadmin?stats
stats realm Haproxy\ Statistics
stats auth admin:123456
stats admin if TRUE
frontend http-in
bind *:80
mode http
log global
option httpclose
option logasap
option dontlognull
capture request header Host len 20
capture request header Referer len 60
acl url_static path_end -i .html .jpg .gif
acl url_dynamic path_end -i .php
default_backend servers
use_backend lnmmp if url_dynamic
backend servers balance roundrobin
server websrv1 10.10.172.196:80 check rise 2 fall 1 weight 2 maxconn 2000
server websrv2 10.10.172.197:80 check rise 2 fall 1 weight 2 maxconn 2000
backend lnmmp balance source
server websrv3 10.10.172.198:80 check rise 2 fall 1 maxconn 2000
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动静分离实现的需求：
访问index.html页面，由Apache1,、Apache2轮询显示；访问index.php页面，有LNMP或者LAMP服务器显示，
本文转自 dengaosky 51CTO博客，原文链接：http://blog.51cto.com/dengaosky/2050231，如需转载请自行联系原作者