RHEL 6.5----haproxy实现负载均衡

主机名	IP
master	192.168.30.130
node-1	192.168.30.131
node-2	192.168.30.132

在master上安装

[root@master ~]# tar -xf haproxy-1.4..tar.gz -C /usr/local/src/
[root@master ~]# cd /usr/local/src/
[root@master src]# cd haproxy-1.4./
[root@master haproxy-1.4.]# ls
CHANGELOG  doc     examples  LICENSE   Makefile.bsd  README   src      tests  VERDATE
contrib    ebtree  include   Makefile  Makefile.osx  ROADMAP  SUBVERS  TODO   VERSION
[root@master haproxy-1.4.]# vim Makefile
PREFIX = /usr/local/haproxy
SBINDIR = $(PREFIX)/sbin
MANDIR = $(PREFIX)/share/man
DOCDIR = $(PREFIX)/doc/haproxy

#### TARGET system
# Use TARGET=<target_name> to optimize for a specifc target OS among the
# following list (use the default "generic" if uncertain) :
#    generic, linux22, linux24, linux24e, linux26, solaris,
#    freebsd, openbsd, cygwin, custom, aix52
TARGET = Linux26
[root@master haproxy-1.4.]# make install
.........................
install -d /usr/local/haproxy/sbin
install haproxy /usr/local/haproxy/sbin
install -d /usr/local/haproxy/share/man/man1
install -m  doc/haproxy. /usr/local/haproxy/share/man/man1
install -d /usr/local/haproxy/doc/haproxy
...

配置haproxy

[root@master haproxy-1.4.]# ls /usr/local/haproxy/  #可以看出目录下面没有配置文件，需要手动创建
doc  sbin  share
[root@master haproxy-1.4.]# cd /usr/local/haproxy/
[root@master haproxy]# mkdir etc
[root@master haproxy]# cd etc/
[root@master etc]# touch haproxy.cfg
global
log 127.0.0.1  local0
#log 127.0.0.1  local1 notice
#log loghost    local0 info
maxconn
chroot /usr/local/haproxy
uid                           #所属运行的用户uid
gid                           #所属运行的用户组
daemon                        #以后台形式运行haproxy
nbproc                         #启动1个haproxy实例
pidfile /usr/local/haproxy/haproxy.pid  #将所有进程写入pid文件
#debug
#quiet
defaults
log    global
log    127.0.0.1      local3        #日志文件的输出定向
mode    http                      #所处理的类别,默认采用http模式，可配置成tcp作4层消息转发
option  httplog                        #日志类别
option  httpclose      #每次请求完毕后主动关闭http通道,haproxy不支持keep-alive,只能模拟这>
种模式的实现
option  dontlognull
option  forwardfor      #如果后端服务器需要获得客户端真实ip需要配置的参数，可以从Http Head
er中获得客户端ip
option  redispatch            #当serverid对应的服务器挂掉后，强制定向到其他健康服务器
retries                     #2次连接失败就认为服务器不可用，主要通过后面的check检查
maxconn
balance roundrobin                    #负载均衡算法
stats  uri    /haproxy-stats          #haproxy 监控页面的访问地址
# 可通过 http://localhost:80/haproxy-stats 访问
contimeout                    #连接超时时间
clitimeout                    #客户端连接超时时间
srvtimeout                    #服务器端连接超时时间
listen  localhost 0.0.0.0:                  #运行的端口及主机名
mode    http
option  httpchk GET /index.html          #健康检测
server  s1 192.168.30.131:  weight  check  #后端的主机 IP &权衡
server  s2 192.168.30.132: weight  check  #后端的主机 IP &权衡
#server  s3 192.168.148.110: weight  check  #后端的主机 IP &权衡

启动和停止haproxy

[root@master ~]# /usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/etc/haproxy.cfg
[root@master ~]# echo $?

[root@master ~]# ps -aux | grep haproxy | grep -v grep
Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2./FAQ
nobody       0.0  0.0     ?        Ss   :   : /usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/etc/haproxy.cfg
重启haproxy
[root@master ~]# /usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/etc/haproxy.cfg -st `cat /usr/local/haproxy/haproxy.pid`
[root@master ~]# echo $?

[root@master ~]# killall haproxy
[root@master ~]# ps -aux | grep haproxy | grep -v grep
Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2./FAQ

查看帮助

[root@master ~]# /usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/etc/haproxy.cfg  --help
HA-Proxy version 1.4. //
Copyright - Willy Tarreau <w@1wt.eu>

Usage : haproxy [-f <cfgfile>]* [ -vdVD ] [ -n <maxconn> ] [ -N <maxpconn> ]
        [ -p <pidfile> ] [ -m <max megs> ]
        -v displays version ; -vv shows known build options.
        -d enters debug mode ; -db only disables background mode.
        -V enters verbose mode (disables quiet mode)
        -D goes daemon
        -q quiet mode : don't display messages
        -c check mode : only check config files and exit
        -n sets the maximum total # of connections ()
        -m limits the usable amount of memory (in MB)
        -N sets the default, per-proxy maximum # of connections ()
        -p writes pids of all children to this file
        -de disables epoll() usage even when available
        -ds disables speculative epoll() usage even when available
        -dp disables poll() usage even when available
        -sf/-st [pid ]* finishes/terminates old pids. Must be last arguments.

开启日志收集

[root@master ~]# vim /etc/rsyslog.conf
.........大约在13,14行，开启UDPServerRun
 $ModLoad imudp
 $UDPServerRun
..........大约在60行左右
 local7.*                                                /var/log/boot.log   #在此行下面添加如下两行内容
 local3.*                                                /var/log/haproxy.log
 local0.*                                                /var/log/haproxy.log
重启rsyslog服务
[root@master ~]# service rsyslog restart
Shutting down system logger:                               [  OK  ]
Starting system logger:                                    [  OK  ]

在node-1和node-2上

安装httpd和php
[root@node- ~]# yum install -y httpd php
创建测试页面
[root@node- ~]# echo "<h1>Web-Server:192.168.30.131</h1>" > /var/www/html/index.html
[root@node- ~]# service httpd restart
在node-2上安装httpd和php
[root@node- ~]# yum install -y httpd php
[root@node- ~]# echo "<h1>Web-Server:192.168.30.132</h1>" > /var/www/html/index.html
[root@node- ~]# service httpd restart

浏览器测试

按F5刷新

查看haproxy的工作状态

配置文件模板和启动脚本的模板可以在这个目录下查看

[root@master ~]# cd /usr/local/src/haproxy-1.4./examples/
[root@master examples]# ls
acl-content-sw.cfg     debug2html                init.haproxy
auth.cfg               debugfind                 init.haproxy.flx0
build.cfg              errorfiles                linux-2.4.-.EL-custom.diff
check                  examples.cfg              option-http_proxy.cfg
check.conf             haproxy-1.1.-flx..pkg  rc.highsock
config.rc.haproxy      haproxy.cfg               stats_haproxy.sh
content-sw-sample.cfg  haproxy.init              tarpit.cfg
cttproxy-src.cfg       haproxy.spec              test-section-kw.cfg
debug2ansi             haproxy.vim               url-switching.cfg
比如创建开机启动
[root@master examples]# cp haproxy.init /etc/init.d/haproxy
[root@master examples]# chkconfig --add haproxy
[root@master examples]# chkconfig haproxy on
[root@master examples]# chkconfig haproxy --list
haproxy            :off    :off    :on    :on    :on    :on    :off