haproxy运用总结

haproxy使用总结

DESCRIPTION
       HAProxy is a TCP/HTTP reverse proxy which is particularly suited for high availability environments. Indeed, it
       can:
        - route HTTP requests depending on statically assigned cookies ;
        - spread the load among several servers while assuring server
          persistence through the use of HTTP cookies ;
        - switch to backup servers in the event a main one fails ;
        - accept connections to special ports dedicated to service
          monitoring ;
        - stop accepting connections without breaking existing ones ;
        - add/modify/delete HTTP headers both ways ;
        - block requests matching a particular pattern ;
        - hold clients to the right application server depending on
          application cookies
        - report detailed status as HTML pages to authenticated users from an
          URI intercepted from the application.

       It needs very little resource. Its event-driven architecture allows it to easily handle thousands of simultaneous
       connections on hundreds of instances without risking the system's stability.

负载均衡

 global
        daemon
        maxconn 256

    defaults
        mode tcp
        timeout connect 5000ms
        timeout client 50000ms
        timeout server 50000ms

    frontend testhost
        bind *:1998
        default_backend servers

    backend servers
        server server52 127.0.0.1:52 check
        server server872 127.0.0.1:872 check
        server server42 127.0.0.1:42 check
        retries 3
        redispatch

灾难备份

global
        daemon
        maxconn 256
        log 127.0.0.1   local3
        pidfile /tmp/haproxy.pid
        #stats socket /tmp/haproxy_1.5_dev_11.stats.socket


    defaults
        mode tcp
        timeout connect 5000ms
        timeout client 50000ms
        timeout server 50000ms
        log     127.0.0.1       local3
        option log-health-checks


    frontend testhost
        bind *:1998
        default_backend servers

    backend servers
        server server52 127.0.0.1:52 check
        server server872 127.0.0.1:872 check backup

热启动(修改config让程序立即生效）

#!/bin/bash
#haproxy_hot_reload_config.sh
#the program will restart the haproxy by using  its hot reconfiguration

config=" /home/prj/haproxy_conf/haproxy.cfg.mysql212"
pidfile=`grep pidfile $config | awk  '{print   $2}'`
pid=`cat $pidfile`
status=-2

if [ -e /proc/$pid/exe ]; then
   /usr/local/sbin/haproxy -D -f  $config -sf $pid
   status=0
else
   /usr/local/sbin/haproxy -D -f  $config
   status=1
fi

echo $status
exit $status

haproxy运用总结

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