#tar zxf haproxy-1.6.2.tar.gz
#make TARGET=linux26 ARCH=x86_64
#make install PREFIX=/usr/local/haproxy
#vim /usr/local/haproxy/haproxy.cfg
#
#/usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/haproxy.cfg
#
#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
global
    log    127.0.0.1 local2          ###[err warning info debug] 
    chroot  /usr/local/haproxy
    pidfile  /var/run/haproxy.pid   ###haproxy的pid存放路径,启动进程的用户必须有权限访问此文件 
    maxconn  4000                   ###最大连接数，默认4000
    user   haproxy
    group   haproxy
    daemon                          ###创建1个进程进入deamon模式运行。此参数要求将运行模式设置为"daemon"

#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will 
# use if not designated in their block
#---------------------------------------------------------------------
defaults
    mode   http             ###默认的模式mode { tcp|http|health }，tcp是4层，http是7层，health只会返回OK
    log    global           ###采用全局定义的日志
    option  dontlognull     ###不记录健康检查的日志信息
    option  httpclose       ###每次请求完毕后主动关闭http通道 
    option  httplog         ###日志类别http日志格式 
    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 Header中获得客户端ip  
    option  redispatch      ###serverId对应的服务器挂掉后,强制定向到其他健康的服务器
    timeout connect 10000   #default 10 second timeout if a backend is not found
    timeout client 300000   ###客户端连接超时
    timeout server 300000   ###服务器连接超时
    maxconn     60000       ###最大连接数
    retries     3           ###3次连接失败就认为服务不可用，也可以通过后面设置 
####################################################################
listen stats
        bind 0.0.0.0:1080           #监听端口  
        stats refresh 30s           #统计页面自动刷新时间  
        stats uri /stats            #统计页面url  
        stats realm Haproxy Manager #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
#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
frontend main                         #
    bind 0.0.0.0:88
#    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     ###满足策略要求，则响应策略定义的backend页面
    default_backend   dynamic            ###不满足则响应backend的默认页面

#---------------------------------------------------------------------
# static backend for serving up images, stylesheets and such
#---------------------------------------------------------------------

#backend static
#    balance     roundrobin                 ###负载均衡模式轮询
#    server      static 127.0.0.1:80 check ###后端服务器定义

backend dynamic
    balance    roundrobin               ##banlance roundrobin 轮询，balance source 保存session值，支持static-rr，leastconn，first，uri等参数
    option  httpchk /index.html          ##检测文件，如果分发到后台index.html访问不到就不再分发给它
    server         websrv1 192.168.230.130:81 check maxconn 2000
#    server         websrv2 10.117.8.20:80 check maxconn 2000

#---------------------------------------------------------------------
# round robin balancing between the various backends
#---------------------------------------------------------------------