haproxy frontend 和backend

<pre name="code" class="sql">frontend
接收请求的前端虚拟节点，Frontend可以根据规则直接指定具体使用后端的 backend(可动态选择)。
 
backend
后端服务集群的配置，是真实的服务器，一个Backend对应一个或者多个实体服务器。




forntend：用于定义一系列监听的套接字，这些套接字可以接受客户端请求并与子建立连接

frontend        www

        bind            *:80
        bind            *:443                   ssl                     crt                     /etc/haproxy/cert.pem
        redirect scheme https if !{ ssl_fc }


frontend  http

        bind            *:80
        bind            *:443                   ssl                     crt                     /etc/haproxy/cert.pem
frontend http_80_in   这个名字自己定义





backend webserver_8001
        mode            http
        balance         roundrobin
        server          webhost01_8001          1.22.05.17:8001     check inter 2000 fall 3
        server          webhost02_8001          10.18.2.1:8001       check inter 2000 fall 3
===================================360buy haproxy 配置例子=========================

frontend http_80
        bind 0.0.0.0:80
        log             global
        acl index       url_end / index.html index.htm index.asp index.aspx index.php index.jsp
        use_backend     index_rr if index
        acl img         url_end .gif .jpg  .jpeg
        use_backend     img_hash if img
        acl statis      url_reg  .(css|js|swf|png|css?.*|js?.*)$
        use_backend     www_any if statis
        default_backend www_any


backend index_rr
        balance         roundrobin
        log             global
        cookie          SERVERID
        option          httpchk GET /robots.txt HTTP/1.1
Host:www.360buy.com
        server          www-80-21     192.168.71.21:80    check inter 3000 rise 1 fall 1 maxconn 65535
backend img_hash
        balance         uri len 15
        log             global
        cookie          SERVERID
        option          httpchk GET /robots.txt HTTP/1.1
Host:www.360buy.com
        server          img-80-51     192.168.71.51:80    check inter 3000 rise 1 fall 1 maxconn 65535
backend www_any
        balance         uri len 15
        log             global
        cookie          SERVERID
        option          httpchk GET /robots.txt HTTP/1.1
Host:www.360buy.com
        server          www-80-21     192.168.71.21:80    check inter 3000 rise 1 fall 1 maxconn 65535
[北京]Jimin(497907352)  10:34:24
对访问比较大的index页面作轮询，其它的页面对url做hash,分到一台服务器上，以提高命中率

url len 15 以URI的前15位做hash