Haproxy学习记录

一、下载

可以去官网下载最新版本，我使用apt-get的方式：

apt-get install haproxy

默认情况下：
配置文件：/etc/haproxy/haproxy.cfg

二、配置haproxy.cfg

#---------------------------------------------------------------------
# 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                  tcplog #mysql为tcplog
    option                  dontlognull
    option http-server-close
    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


listen  mysql
        bind 0.0.0.0:43306    #自己定义一个端口，用于各种程序连接
        mode tcp              #mysql负载均衡必须为 TCP模式
        option mysql-check user haproxy   #mysql健康检查haproxy，在每个服务器中创建haproxy用户，无权限，无密码
        balance roundrobin            #调度算法
        server mysql-win 192.168.1.103:3306 weight 1 check port 3306  inter 1s rise 2 fall 2   # ip1,可以绑定中间件如mycat
        server mysql-centos 192.168.32.129:3306 weight 1 check port 3306 inter 1s rise 2 fall 2  #ip2,可以绑定中间件如mycat
    #inter表示检查间隔，单位为毫秒，建议不要太短，fall：检查失败2次后放弃检查；rise：连续检查成功2次后认为服务器可用。
listen stats     #监控
           mode http
           bind 0.0.0.0:43307  #后台监控 访问端口
           stats enable
           stats uri /mysql  #后台监控页面地址
           stats realm Global statistics
           stats auth admin:admin #后台密码 

三、启动Haproxy

sudo haproxy -f /etc/haproxy/haproxy.cfg

查看监控：

数据库架构：