mysql lvs keepalived 双主热备

操作系统

Red Hat Enterprise Linux Server release 5.6 (Tikanga)

mysql-vip:10.10.11.254

mysql-master1:10.10.11.251

mysql-master2:10.10.11.253

mysql版本：mysql5.5.19

ipvsadm版本：ipvsadm-1.24.tar.gz

keepalived-1.2.1.tar.gz

1 安装lvs

ln -sv /usr/src/kernels/2.6.18-194.el5-i686/ /usr/src/linux

注：这个很重要，不然编译不过。因为编译时要用kernel-source,而Makefile文件设置到kernel-source路径是/usr/src/linux

tar zxvf ipvsadm-1.24.tar.gz

cd ipvsadm-1.24

make && make install

ipvsadm

检查当前加载的内核模块，是否存在ip_vs模块

lsmod | grep ip_vs

ip_vs 122113 0

2 安装mysql 5.5.19 主主复制

不同的地方就是server-id,主服务器配置文件不用修改,从服务器的配置文件server-id=10.其他的内容基本相同.

将10.10.11.251设为10.10.11.253的主服务器，在10.10.11.251新建授权用户

mysql> grant replication slave on *.* to 'replication'@'%' identified by 'replication';

得到binlog日志文件名和偏移量

在10.10.11.253上将10.10.11.251设置为自己的主服务器

change master to master_host='10.10.11.251',master_user='replication',master_password='replication',master_log_file='mysql-bin.000003',master_log_pos=107;

将10.10.11.253设为10.10.11.251的主服务器，在10.10.11.253新建授权用户

mysql> grant replication slave on *.* to 'replication'@'%' identified by 'replication';

得到binlog日志文件名和偏移量

在10.10.11.251上将10.10.11.253设置为自己的主服务器

mysql> change master to master_host='10.10.11.253',master_user='replication',master_password='replication',master_log_file='mysql-bin.000005',master_log_pos=195;

启用复制功能（两台机器）
mysql> start slave;
mysql> show slave status/G

出现的问题

当我在执行start slave这条命令时，系统提示

ERROR 1200 (HY000): The server is not configured as slave; fix in config file or with CHANGE MASTER TO，

执行show slave status;又提示Empty set (0.00 sec)，想不通问题在哪里

后来发现，原来slave已经默认开启，要先关闭再开启

执行 slave stop;

再执行

change master to master_host='192.168.1.222',master_user='repl',master_password='123456', master_log_file='log.000003' ,master_log_pos=98;

然后执行 slave start;

这时再执行show slave status\G

首先在Master上用
show processlist; 查看下进程是否Sleep太多。发现很正常。
show master status; 也正常。
再跑到Slave上查看
show slave status;
错误提示：
Error 'Duplicate entry '1' for key 1' on query. Default database: 'movivi1'. Query: 'INSERT INTO `v1vid0_user_samename` VALUES(null,1,'123','11','4545','123')'

Slave_SQL_Running 为 NO
Seconds_Behind_Master 为 (null)

可见是Slave不同步

解决：
stop slave;
set global sql_slave_skip_counter =1 ;
start slave;

之后Slave会和Master去同步主要看Seconds_Behind_Master是否为0，直到为0时就已经同步

2 安装keepalived

安装keepalived
# tar zxvf keepalived-1.2.1.tar.gz
# cd keepalived-1.2.1
# ./configure --prefix=/usr/local/keepalived --with-kernel-dir=/usr/src/kernels/2.6.18 -194.el5-i686/
# make && make install

cp /usr/local/keepalived/sbin/keepalived /usr/sbin #设置环境

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

cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d 设置keepalived 为系统服务

mkdir /etc/keepalived

cp /usr/local/webserver/keepalived/etc/keepalived/keepalived.conf /etc/keepalived

chkconfig --add keepalived #此种方式不适合mysql keepalived 主主

chkconfig --level 345 keepalived on

chkconfig --list|grep keepalived

用如下方式：keepalived必须在mysql启动后启动，否则会因为mysql没有启动而自动关闭

192.168.15.168上配置keepalived
global_defs {
      notification_email {
      [email protected]
      }
      notification_email_from [email protected]
      smtp_server 127.0.0.1
      smtp_connect_timeout 30
      router_id MySQL-ha
      }
vrrp_instance VI_1 {
      state BACKUP   #两台配置此处均是BACKUP
      interface eth0
      virtual_router_id 51
      priority 100   #优先级，另一台改为90
      advert_int 1
      nopreempt #不抢占，只在优先级高的机器上设置即可，优先级低的机器不设置
      authentication {
      auth_type PASS
      auth_pass 1111
      }
      virtual_ipaddress {
      192.168.15.170
      }
      }
virtual_server 192.168.15.170 3306 {
      delay_loop 2   #每个2秒检查一次real_server状态
      lb_algo wrr   #LVS算法
      lb_kind DR    #LVS模式
      persistence_timeout 60   #会话保持时间
      protocol TCP
      real_server 192.168.15.168 3306 {
      weight 3
      notify_down /usr/local/MySQL/bin/MySQL.sh #检测到服务down后执行的脚本
      TCP_CHECK {
      connect_timeout 10    #连接超时时间
      nb_get_retry 3       #重连次数
      delay_before_retry 3   #重连间隔时间
      connect_port 3306   #健康检查端口
      }
      }
编写检测服务down后所要执行的脚本
#vi /usr/local/MySQL/bin/MySQL.sh
#!/bin/sh
pkill keepalived
#chmod +x /usr/local/MySQL/bin/MySQL.sh
启动keepalived
#/usr/local/keepalived/sbin/keepalived –D
#ps -aux | grep keepalived

192.168.15.169上配置keepalived
# mkdir /etc/keepalived
# vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
      notification_email {
      [email protected]
      }
      notification_email_from [email protected]
      smtp_server 127.0.0.1
      smtp_connect_timeout 30
      router_id MySQL-ha
      }
vrrp_instance VI_1 {
      state BACKUP   #两台配置此处均是BACKUP
      interface eth0
      virtual_router_id 51
      priority 90   #优先级
      advert_int 1
      authentication {
      auth_type PASS
      auth_pass 1111
      }
      virtual_ipaddress {
      192.168.15.170
      }
      }
virtual_server 192.168.15.170 3306 {
      delay_loop 2   #每个2秒检查一次real_server状态
      lb_algo wrr   #LVS算法
      lb_kind DR    #LVS模式
      persistence_timeout 60   #会话保持时间
      protocol TCP
      real_server 192.168.15.169 3306 {
      weight 3
      notify_down /usr/local/MySQL/bin/MySQL.sh #检测到服务down后执行的脚本
      TCP_CHECK {
      connect_timeout 10    #连接超时时间
      nb_get_retry 3       #重连次数
      delay_before_retry 3   #重连间隔时间
      connect_port 3306   #健康检查端口
      }
      }
编写检测服务down后所要执行的脚本
#vi /usr/local/MySQL/bin/MySQL.sh
#!/bin/sh
pkill keepalived
#chmod +x /usr/local/MySQL/bin/MySQL.sh
启动keepalived
#/usr/local/keepalived/sbin/keepalived –D
#ps -aux | grep keepalived

检测lvs路由到哪台机器

[root@misdata2 ~]# ipvsadm -L -n --stats
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port               Conns   InPkts OutPkts InBytes OutBytes
-> RemoteAddress:Port
TCP 192.168.5.57:3306                   0        0        0        0        0
-> 192.168.5.59:3306                   0        0        0        0

可以用同网段的另一台服务器 arping 1 这个虚拟IP
看看对应该的MAC地址可以知道虚拟IP对应的真实服务器

[root@MimmsApp1 ~]# arping 192.168.5.57
ARPING 192.168.5.57 from 192.168.5.50 eth0
Unicast reply from 192.168.5.57 [78:2B:CB:69:3A:DD] 0.725ms
Unicast reply from 192.168.5.57 [78:2B:CB:68:FC:41] 0.765ms
Unicast reply from 192.168.5.57 [78:2B:CB:68:FC:41] 0.748ms

查看keepalived 是否运行

[root@misdata1 ~]# /etc/init.d/keepalived status
keepalived (pid 7113) is running...

keepalived停止、启动

[root@misdata2 ~]# /etc/init.d/keepalived stop |stop|restart

keepalived 日志

[root@misdata2 ~]# tail -f /var/log/messages

查看mysql是否运行

[root@misdata1 ~]# /etc/init.d/mysql status
MySQL running (6970) [ OK ]

在windows客户端ping -t 10.10.11.254

keepalived故障转移测试
在windows 客户端一直ping 192.168.15.170 然后分别关闭192.168.15.168 192.168.15.169 上的keepalived 看是否自动切换

keepalived的日志文件路径为：tail -f /var/log/messages

mysql lvs keepalived 双主热备

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