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。
摘自[百度百科]
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 6.4系统中yum源提供的Haproxy的版本为1.5.2,在这里我们直接用yum安装
1、安装haproxy
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# yum -y install haproxy # 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
/usr/bin/halog /usr/bin/iprange /usr/sbin/haproxy /usr/share/doc/haproxy-1 .5.2
/usr/share/doc/haproxy-1 .5.2 /acl-content-sw .cfg
/usr/share/doc/haproxy-1 .5.2 /acl .fig
/usr/share/doc/haproxy-1 .5.2 /haproxy .cfg
/usr/share/doc/haproxy-1 .5.2 /internals
/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/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 -h HA-Proxy version 1.5.2 2014 /07/12
Copyright 2000-2014 Willy Tarreau <w@1wt.eu> 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/rsyslog SYSLOGD_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:192.168.0.105
Apache1-Client:192.168.0.102
Apache2-Client:192.168.0.106
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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
default_backend servers
frontend healthcheck bind :1099
mode http
option httpclose
option forwardfor
default_backend servers
backend servers balance roundrobin
server websrv1 192.168.0.102:80 check maxconn 2000
server websrv2 192.168.0.106:80 check maxconn 2000
********************************************************************** |
2、启动Haproxy服务
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# service haproxy start 正在启动 haproxy: [确定] |
3、浏览器访问
单独访问Apache1:192.168.0.102
单独访问Apache2:192.168.0.106
多次刷新访问Haproxy:192.168.0.105
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 0.0.0.0:1080 #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 stop 停止 httpd: [确定] |
(4)在次查看监控页面
六、Haproxy的动静分离
注释说明:
在这里说明动静分离的演示流程,后端分别三台负载均衡主机上放上同样的页面,静态页面index.html,动态页面a.php;然后访问haproxy主机的静态页面和动态页面,来判断访问的是那台主机
1、动静分离的主机分配
Haproxy:192.168.0.105 proxy
Apache1:192.168.0.102 static
Apache2:192.168.0.106 static
Nginx01:192.168.0.107 dynamic
2、浏览器分别访问各个主机
Apache1:192.168.0.102 static
Apache1:192.168.0.102 dynamic
Apache1:192.168.0.106 static
Apache1:192.168.0.106 dynamic
Nginx01:192.168.0.107 static
Nginx01:192.168.0.107 dynamic
3、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 192.168.0.102:80 check rise 2 fall 1 weight 2 maxconn 2000
server websrv2 192.168.0.106:80 check rise 2 fall 1 weight 2 maxconn 2000
backend lnmmp balance source
server websrv3 192.168.0.107:80 check rise 2 fall 1 maxconn 2000
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4、动静分离访问测试
七、近期网络架构
期望网友能够指点架构的优缺点,后期将会发布此博文
本文转自zys467754239 51CTO博客,原文链接:http://blog.51cto.com/467754239/1581237,如需转载请自行联系原作者