Haproxy+Keepalived+MySQL实现读均衡负载

发布时间：2020-08-11 00:12:47 作者：kunlunzhiying
来源：ITPUB博客阅读：125

环境说明：

本系统对数据安全性不高，TPS操作很低，主要是查询的环境。

本方案架构图如下：

应用服务器对只读的应用程序连接虚拟IP地址，连接到haproxy，然后通过haproxy将TCP协议转移到下面的3个数据库服务器中。

Haproxy在此做4层的TCP交换服务。keepalived为了防止haproxy单点故障。

为什么不用LVS？

我们的环境服务器少，haproxy和lvs相比性能差不多，且haproxy自带有mysql check，不需要额外的写mysql侦测脚本。

1.haproxy安装

下载地址：http://www.haproxy.org/download/1.5/src/haproxy-1.5.5.tar.gz

依赖包安装：

#yum install gcc gcc-c++ make zlib-devel bzip2-devel openssl-devel

安装pcre，自带的pcre-7.8-3.1.el6.x86_64貌似版本低了，导致无法安装proxy

#tar xzvf pcre-8.34.tar.gz

#cd pcre-8.34

#./configure --prefix=/usr \

--docdir=/usr/share/doc/pcre-8.34 \

--enable-utf --enable-unicode-properties \

--enable-pcregrep-libz --enable-pcregrep-libbz2

#make

#make check

#make install

script "/etc/keepalived/check_haproxy.sh"

interval 2

weight 2

global_defs {

router_id LVS_DEVEL

}

vrrp_instance VI_1 {

state MASTER

interface bond0

virtual_router_id 51

priority 150

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

track_script {

chk_http_port

}

virtual_ipaddress {

192.168.231.18

}

配置侦测haproxy状态脚本：

#vi /etc/keepalived/check_haproxy.sh

#!/bin/bash

A=`ps -C haproxy --no-header |wc -l`

if [ $A -eq 0 ];then

/usr/local/sbin/haproxy -f /etc/haproxy/haproxy.conf

sleep 3

if [ `ps -C haproxy --no-header |wc -l` -eq 0 ];then

/etc/init.d/keepalived stop

启动keepalived服务：

# /etc/init.d/keepalived start

添加新的协议地址：

#ip add

[root@mss-dn03 ~]# ip add

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN

link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

inet 127.0.0.1/8 scope host lo

inet6 ::1/128 scope host

valid_lft forever preferred_lft forever

2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN qlen 1000

link/ether 90:e2:ba:23:87:04 brd ff:ff:ff:ff:ff:ff

3: eth2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN qlen 1000

link/ether 90:e2:ba:23:87:05 brd ff:ff:ff:ff:ff:ff

9: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP

link/ether 6c:ae:8b:26:52:3b brd ff:ff:ff:ff:ff:ff

inet 192.168.231.7/24 brd 192.168.231.255 scope global bond0

inet6 fe80::6eae:8bff:fe26:523b/64 scope link tentative dadfailed

valid_lft forever preferred_lft forever

设置开启自启动：

# chkconfig --level 0123456 keepalived on

# chkconfig --list keepalived

测试过程中发现，master宕机后，VIP需要几十秒才能ping通，切换很慢：

arping -I bond0 -c 5 -s VIP GATEWAY

# arping -I bond0 -c 5 -s 192.168.231.18 192.168.231.254

Getting started with HAProxy and MySQL replication（能实现读写路由）：

http://blog.yannickjaquier.com/linux/getting-started-with-haproxy-and-mysql-replication.html

Haproxy配置日志：

http://www.linuxidc.com/Linux/2012-06/63585.htm

来自为知笔记(Wiz)

Haproxy+Keepalived+MySQL实现读均衡负载

环境说明：

1.haproxy安装

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