haproxy负载均衡166.110.110.100
后端服务器1 166.110.110.1
后端服务器2 166.110.110.2
原文地址

----------------------------centos 7 处理--------------------------------------------
关闭SELinux
vi /etc/selinux/config
#SELINUX=enforcing #注释掉
#SELINUXTYPE=targeted #注释掉
SELINUX=disabled #增加
:wq!  #保存退出
setenforce 0 #使配置立即生效

关闭centos 7的防火墙(仅在测试的时候)
systemctl stop firewalld.service
systemctl disable firewalld.service
-----------------------------------haproxy安装----------------------------------------------------
yum install wget gcc -y && wget -c --no-check-certificate https://src.fedoraproject.org/repo/pkgs/haproxy/haproxy-1.8.12.tar.gz && tar -xvf haproxy-1.8.12.tar.gz && cd haproxy-1.8.12

groupadd haproxy #添加haproxy组
useradd -g haproxy haproxy -s /bin/false #创建nginx运行账户haproxy并加入到haproxy组，不允许haproxy
---------------------------------------haproxy配置----------------------------------------------------
vi /etc/haproxy/haproxy.cfg

修改为以下配置
#---------------------------------------------------------------------
# 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
    # 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

#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------
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

#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
listen admin_stats  
        bind 127.0.0.1:1080               #监听端口  
        mode http                       #http的7层模式  
        option httplog                  #采用http日志格式  
        #log 127.0.0.1 local0 err  
        maxconn 10  
        stats refresh 30s               #统计页面自动刷新时间  
        stats uri /stats                #统计页面url  
        stats realm Proxy\ Haproxy  #统计页面密码框上提示文本  
        stats auth admin:admin          #统计页面用户名和密码设置  
        stats hide-version              #隐藏统计页面上HAProxy的版本信息  


listen test1  
        bind 0.0.0.0:80  
        mode tcp
        balance leastconn
        #maxconn 40000  
        #log 127.0.0.1 local0 debug  
        server s1 166.110.110.1:80  
        server s2 166.110.110.2:80
------------------------------------------------------------------------------------------------------
centos7下haproxy启动停止重启重载状态等控制命令
systemctl (start, stop, restart, try-restart, reload, force-reload, status) haproxy.service

haproxy web监控信息166.110.110.100为haproxy安装所在服务器IP
http://166.110.110.100:1080/status
-----------------------------后端安装lighttpd 作为测试用----------------------------------------------
systemctl stop firewalld.service
systemctl disable firewalld.service
关闭SELinux
vi /etc/selinux/config
将SELINUX=enforcing改为SELINUX=disabled

安装
yum install -y epel-release gcc gcc-c++ autoconf automake  zlib zlib-devel pcre-devel zip unzip libtool bzip2-* && yum install -y lighttpd && systemctl enable lighttpd

编辑配置文件关闭ipv6
vi /etc/lighttpd/lighttpd.conf
注释掉ipv6

启动服务器
systemctl restart lighttpd.service

默认目录及首页
/var/www/lighttpd/index.html

对两个index.html进行修改进行区别
后端第一个服务器
echo "<h1>this is upstream server 1" >> /var/www/lighttpd/index.html

后端第二个服务器
echo "<h1>this is upstream server 2" >> /var/www/lighttpd/index.html
访问haproxy所在服务器IP或者解析的域名刷新试试

-----------------------------Haproxy 负载均衡的8种算法----------------------------------------
balance roundrobin # 轮询，软负载均衡基本都具备这种算法

balance static-rr # 根据权重，建议使用

balance leastconn # 最少连接者先处理，建议使用

balance source # 根据请求源IP，建议使用

balance uri # 根据请求的URI

balance url_param，# 根据请求的URl参数'balance url_param' requires an URL parameter name

balance hdr(name) # 根据HTTP请求头来锁定每一次HTTP请求

balance rdp-cookie(name) # 根据据cookie(name)来锁定并哈希每一次TCP请求

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