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MySQL主从复制与lvs+keepalived单点写入读负载均衡高可用实验

2015-01-21 01:08 1111 查看

http://blog.csdn.net/wzy0623/article/details/38757561




MySQL主从复制与lvs+keepalived单点写入读负载均衡高可用实验

分类: MySQL2014-08-22
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一、环境

Master(主机A):192.168.1.1

Slave(主机B) :192.168.1.2

W-VIP(写入) :192.168.1.3

R-VIP(读取) :192.168.1.4

Client(测试) :192.168.1.100

操作系统版本:CentOS release 6.4

MySQL数据库版本:5.6.14

keepalived版本:1.2.7

LVS版本:1.26

所有环境均为虚拟机

二、设计思路

1. 服务器A和B,通过mysql的slave进程同步数据。

2. 通过keepalived启用两个虚IP:W-VIP/R-VIP,一个负责写入,一个负责读取,实现读写分离。

3. A和B都存在时,W-VIP下将请求转发至主机A,R-VIP将请求转发给A和B,实现负载均衡。

4. 当主机A异常时,B接管服务,W-VIP/R-VIP此时漂到了主机B上,此时这两个虚IP下都是主机B,实现高可用

5. 当主机B异常时,R-VIP会将B踢出,其他不变

三、架构图



四、软件安装

主从两个主机都要装以下软件:

1. MySQL的安装(略)

2. keepalived安装

yum install keepalived

2. LVS安装

yum install ipvsadm

五、配置

1. 配置MySQL的主从复制(略)

2. 配置keepalived

Master上的配置

vi /etc/keepalived/keepalived.conf

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! Configuration File for keepalived

global_defs {

router_id MySQL-ha

}

vrrp_instance VI_1 {

state BACKUP

interface eth1

virtual_router_id 90

priority 100

advert_int 1

notify_master "/usr/local/mysql/bin/remove_slave.sh"

nopreempt

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.1.3 label eth1:1

192.168.1.4 label eth1:2

}

}

virtual_server 192.168.1.3 6603 {

delay_loop 2

lb_algo wrr

lb_kind DR

persistence_timeout 60

protocol TCP

real_server 192.168.1.1 6603 {

weight 3

notify_down /usr/local/mysql/bin/mysql.sh

TCP_CHECK {

connect_timeout 10

nb_get_retry 3

delay_before_retry 3

connect_port 6603

}

}

}

virtual_server 192.168.1.4 6603 {

delay_loop 2

lb_algo wrr

lb_kind DR

persistence_timeout 60

protocol TCP

real_server 192.168.1.1 6603 {

weight 1

notify_down /usr/local/mysql/bin/mysql.sh

TCP_CHECK {

connect_timeout 10

nb_get_retry 3

delay_before_retry 3

connect_port 6603

}

}

real_server 192.168.1.2 6603 {

weight 3

TCP_CHECK {

connect_timeout 10

nb_get_retry 3

delay_before_retry 3

connect_port 6603

}

}

}

keepalived配置成服务并开机启动

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cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/

cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

cp /usr/local/keepalived/sbin/keepalived /usr/sbin/

chkconfig --add keepalived

chkconfig --level 345 keepalived on

vi /usr/local/mysql/bin/remove_slave.sh

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#!/bin/bash

user=u1

password=12345

log=/usr/local/mysql/log/remove_slave.log

echo "`date`" >> $log

/usr/local/mysql/bin/mysql -u$user -p$password -e "set global read_only=OFF;reset master;stop slave;change master to master_host='localhost';" >> $log

/bin/sed -i 's#read-only#\#read-only#' /etc/my.cnf

vi /usr/local/mysql/bin/mysql.sh

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#!/bin/bash

/etc/init.d/keepalived stop

Slave上的配置

vi /etc/keepalived/keepalived.conf

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! Configuration File for keepalived

global_defs {

router_id MySQL-ha

}

vrrp_instance VI_1 {

state BACKUP

interface eth1

virtual_router_id 90

priority 99

advert_int 1

notify_master "/usr/local/mysql/bin/remove_slave.sh"

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.1.3 label eth1:1

192.168.1.4 label eth1:2

}

}

virtual_server 192.168.1.3 6603 {

delay_loop 2

lb_algo wrr

lb_kind DR

persistence_timeout 60

protocol TCP

real_server 192.168.1.2 6603 {

weight 3

notify_down /usr/local/mysql/bin/mysql.sh

TCP_CHECK {

connect_timeout 10

nb_get_retry 3

delay_before_retry 3

connect_port 6603

}

}

}

virtual_server 192.168.1.4 6603 {

delay_loop 2

lb_algo wrr

lb_kind DR

persistence_timeout 60

protocol TCP

real_server 192.168.1.2 6603 {

weight 3

notify_down /usr/local/mysql/bin/mysql.sh

TCP_CHECK {

connect_timeout 10

nb_get_retry 3

delay_before_retry 3

connect_port 6603

}

}

}

keepalived配置成服务并开机启动

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cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/

cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

cp /usr/local/keepalived/sbin/keepalived /usr/sbin/

chkconfig --add keepalived

chkconfig --level 345 keepalived on

vi /usr/local/mysql/bin/remove_slave.sh

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#!/bin/bash

user=u1

password=12345

log=/usr/local/mysql/log/remove_slave.log

echo "`date`" >> $log

/usr/local/mysql/bin/mysql -u$user -p$password -e "set global read_only=OFF;reset master;stop slave;change master to master_host='localhost';" >> $log

/bin/sed -i 's#read-only#\#read-only#' /etc/my.cnf

vi /usr/local/mysql/bin/mysql.sh

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#!/bin/bash

/etc/init.d/keepalived stop

3. 配置LVS

Master与Slave上的配置相同:

vi /usr/local/bin/lvs_real.sh

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#!/bin/bash

# description: Config realserver lo and apply noarp

SNS_VIP=192.168.1.3

SNS_VIP2=192.168.1.4

source /etc/rc.d/init.d/functions

case "$1" in

start)

ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP

ifconfig lo:1 $SNS_VIP2 netmask 255.255.255.255 broadcast $SNS_VIP2

/sbin/route add -host $SNS_VIP dev lo:0

/sbin/route add -host $SNS_VIP2 dev lo:1

echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore

echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce

echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore

echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce

sysctl -p >/dev/null 2>&1

echo "RealServer Start OK"

;;

stop)

ifconfig lo:0 down

ifconfig lo:1 down

route del $SNS_VIP >/dev/null 2>&1

route del $SNS_VIP2 >/dev/null 2>&1

echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore

echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce

echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore

echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce

echo "RealServer Stoped"

;;

*)

echo "Usage: $0 {start|stop}"

exit 1

esac

exit 0

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chmod 755 /usr/local/bin/lvs_real.sh

echo "/usr/local/bin/lvs_real.sh start" >> /etc/rc.local

五、Master和Slave的启动

1. 启动Master上的MySQL

service mysql start

2. 启动Slave上的MySQL

service mysql start

3. 启动Master上的realserver脚本

/usr/local/bin/lvs_real.sh start

4. 启动Slave上的realserver脚本

/usr/local/bin/lvs_real.sh start

5. 启动Master上的keepalived

service keepalived start

6. 启动Slave上的keepalived

service keepalived start

六、测试

1. 查看lvs能否进行负载均衡转发

在Master和Slave上分别执行:

ipvsadm -ln

2. 在Client上验证连通性:

ping 192.168.1.3

ping 192.168.1.4

mysql -u u1 -p12345 -P 6603 -h 192.168.1.3 -e "show variables like 'server_id'"

mysql -u u1 -p12345 -P 6603 -h 192.168.1.4 -e "show variables like 'server_id'"

3. 停掉Master上的MySQL,看写IP否自动切换到Slave,看读IP是否去掉了Master的MySQL

在Master和Slave上分别执行:

ipvsadm -ln

在Client上执行:

mysql -u u1 -p12345 -P 6603 -h 192.168.1.3 -e "show variables like 'server_id'"

mysql -u u1 -p12345 -P 6603 -h 192.168.1.4 -e "show variables like 'server_id'"

4. 停掉Master上的keepalived,看读写VIP是否会迁移到Slave上。

在Master和Slave上分别执行:

ipvsadm -ln

在Client上执行:

mysql -u u1 -p12345 -P 6603 -h 192.168.1.3 -e "show variables like 'server_id'"

mysql -u u1 -p12345 -P 6603 -h 192.168.1.4 -e "show variables like 'server_id'"

5. 停掉Slave上的MySQL,看读IP是否去掉了Slave的MySQL

在Master和Slave上分别执行:

ipvsadm -ln

在Client上执行:

mysql -u u1 -p12345 -P 6603 -h 192.168.1.3 -e "show variables like 'server_id'"

mysql -u u1 -p12345 -P 6603 -h 192.168.1.4 -e "show variables like 'server_id'"

6. 重启Master的系统,看看切换过程是否正常

七、参考
http://wenku.baidu.com/link?url=17K0UDApzfK18A8F5Of9wl0lmGx6AD_0PQ8GyVqmCsBMSz16xjt2JI88lPAeID2qECs7piUxkzQLyatTtDuEJxwZEy6joIBfBmT3vgTfdUS http://blog.chinaunix.net/uid-23500957-id-3781918.html http://blog.chinaunix.net/uid-23500957-id-3781919.html http://blog.chinaunix.net/uid-20639775-id-3337471.html
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