MySQL主主高可用(keepalive)

 2台新的虚拟机172.16.1.1、172.16.1.2  (配置yum源 )

安装数据库服务

其中 172.16.1.1、172.16.1.2运行数据库服务并设置数据库管理员从本机登录的密码是xzw12345 （mysql-server.5.6）

 tar -xvf MySQL-5.6.rpm.tar （RPM包安装）

rpm -Uvh MySQL-*.rpm

/etc/init.d/mysql  start  ; chkconfig  mysql   on

 修改密码

[root@mail ~]# cat /root/.mysql_secret

[root@mail ~]# mysql -uroot -pjBJIfBwD

mysql> set password for root@"localhost"=password("xzw12345");

mysql> quit;

[root@mail ~]# mysql -uroot -pxzw12345

mysql>

 

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主主结构

master203：

mysql   -uroot  -pxzw12345

mysql> grant  replication  slave  on  *.*   to   slaveuser@"%" identified by  "123456";

mysql>quit;

 

vim /etc/my.cnf

[mysqld]

log-bin=master203

server_id=203

:wq

/etc/init.d/mysql  restart

ls  /var/lib/mysql/master203.*

 

mysql   -uroot  -pxzw12345

mysql>show  master  status;

 

master204：

mysql   -uroot  -pxzw123

mysql> grant  replication  slave  on  *.*   to   slaveuser@"%" identified by  "123456";

mysql>quit;

 

vim /etc/my.cnf

[mysqld]

log-bin=master204

server_id=204

:wq

/etc/init.d/mysql  restart

ls  /var/lib/mysql/master204.*

 

mysql   -uroot  -pxzw12345

mysql>show  master  status;

 

 

master204向master203发起同步操作，指定相关master172.16.1.1的相关参数

mysql   -uroot  -pxzw12345

mysql>   change master  to   master_host="172.16.1.1",master_user="slaveuser",master_password="123456",master_log_file="master203.000001",master_log_pos=120;

mysql> start  slave;

mysql> show slave status\G;

               IO  yes

               SQL   yes

 

 

master203向master204发起同步操作，指定相关master172.16.1.2的相关参数

mysql   -uroot  -pxzw12345 

mysql>   change master  to master_host="172.16.1.2",master_user="slaveuser",master_password="123456",master_log_file="master204.000001",master_log_pos=120;

mysql> start  slave;

mysql> show slave status\G;

               IO  yes

               SQL   yes

 

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 测试

1.master203

mysql  -uroot   -pxzw12345

mysql>  create  database  bbsdb;

mysql> grant all on  bbsdb.*  to   student@"%" identified by "123";

mysql> quit;

 2.master204

mysql  -uroot   -pxzw12345

mysql>use bbsdb;

mysql> create  table  bbsdb.t1(id int);

mysql> quit;

 

3.在客户端访问（192.168.1.200）:

ping  x.x.x.1

mysql  -hx.x.x.1  -ustudent   -p123

mysql>  insert into  bbsdb.t1  values(101);

 

在master203、master204

mysql  -uroot  -pxzw12345

mysql > select * from  bbsdb.t1  ; #也能够查看到记录

 

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本文为大家讲解的是mysql错误：Last_IO_Error: error connecting to master解决方法，感兴趣的同学参考下。

错误提示：

Slave_IO_Running: Connecting

Slave_SQL_Running: Yes

Last_IO_Errno: 2003

Last_IO_Error: error connecting to master 'slaveuser@172.16.1.1:3306' - retry-time: 60 retries: 1

错误原因：

主数据库服务器没有关闭防火墙。

解决措施：

1、去主服务器：172.16.1.1关闭防火墙。

[root@mysql204 ~]#  service iptables stop;chkconfig iptables off

iptables: Setting chains to policy ACCEPT: filter          [  OK  ]

iptables: Flushing firewall rules:                         [  OK  ]

iptables: Unloading modules:                               [  OK  ]

2、去从服务器：stop slave;start slave;

mysql> stop slave;

Query OK, 0 rows affected (0.01 sec)

mysql> start slave;

Query OK, 0 rows affected (0.01 sec)

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 Keepalived高可用服务器（keepalived-1.2.7）

 问题

两台Linux服务器（172.16.1.1、172.16.1.2），做MySQL服务器，并部署Keepalived高可用软件，一台作为客户端主机（192.168.1.200），实现如下功能：

• 使用Keepalived实现MySQL服务器的高可用
• Web服务器IP地址分别为172.16.1.1和172.16.1.2
• Web服务器的漂移VIP地址为172.16.1.3
• 客户端通过访问VIP地址访问MySQL服务

 

 步骤

实现此案例需要按照如下步骤进行。

步骤一：配置网络环境

1）设置MySQL服务器网络参数

[root@mysql203 ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE=eth1
TYPE=Ethernet
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=none
IPADDR=172.16.1.1
NETMASK=255.255.255.0
#DNS2=221.4.8.1
#GATEWAY=192.168.1.1
#DNS1=192.168.9.1
IPV6INIT=no
USERCTL=no

[root@mysql204 ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth1

DEVICE=eth1
TYPE=Ethernet
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=none
IPADDR=172.16.1.2
NETMASK=255.255.255.0
#DNS2=221.4.8.1
#GATEWAY=192.168.1.1
#DNS1=192.168.9.1
IPV6INIT=no
USERCTL=no

 

步骤二：安装Keepalived软件

注意：两台MySQL服务器做相同的操作。

[root@mysql203 package]#  yum install -y gcc kernel-devel openssl-devel popt-devel

[root@mysql203 package]#  tar -xzf keepalived-1.2.7.tar.gz

[root@mysql203 package]#  cd keepalived-1.2.7

[root@mysql203 keepalived-1.2.7]# ./configure --sysconf=/etc

[root@mysql203 keepalived-1.2.7]# make && make install

[root@mysql203 keepalived-1.2.7]#  ln -s /usr/local/sbin/keepalived /sbin/

[root@mysql203 keepalived-1.2.7]# chkconfig keepalived on

 

步骤三：部署Keepalived服务

1）修改web1服务器Keepalived配置文件

1. [root@mysql203~]# vim /etc/keepalived/keepalived.conf
2. global_defs {
3. notification_email {
4. [e-mail]               //设置报警收件人邮箱
5. }
6. notification_email_from root@localhost    //设置发件人
7. smtp_server 127.0.0.1                //定义邮件服务器
8. smtp_connect_timeout 30
9. router_id mysql203                        //设置路由ID号
10. }
11. vrrp_instance VI_1 {
12. state MASTER                          //主服务器为MASTER
13. interface eth1                        //定义网络接口
14. virtual_router_id 51                    //主辅VRID号必须一致
15. priority 100                     //服务器优先级
16. advert_int 1
17. authentication {
18. auth_type pass
19. auth_pass forlvs                      //主辅服务器密码必须一致
20. }
21. virtual_ipaddress { 172.16.1.3}
22. }

2）修改mysql204服务器Keepalived配置文件

1. [root@mysql204~]# vim /etc/keepalived/keepalived.conf
2. global_defs {
3. notification_email {
4. [e-mail]                //设置报警收件人邮箱
5. }
6. notification_email_from root@localhost    //设置发件人
7. smtp_server 127.0.0.1                //定义邮件服务器
8. smtp_connect_timeout 30
9. router_id mysql204                       //设置路由ID号
10. }
11. vrrp_instance VI_1 {
12. state SLAVE                          //从服务器为SLAVE
13. interface eth1                        //定义网络接口
14. virtual_router_id 51                    //主辅VRID号必须一致
15. priority 90                       //服务器优先级
16. advert_int 1
17. authentication {
18. auth_type pass
19. auth_pass forlvs                      //主辅服务器密码必须一致
20. }
21. virtual_ipaddress { 172.16.1.3 }
22. }

3）启动服务

1. [root@mysql203~]# service keepalived start
2. [root@mysql204~]# service keepalived start

步骤四：测试

1）登录两台Web服务器查看VIP信息

1. [root@mysql203~]# ip addr show
2. [root@mysql204~]# ip addr show

2) 客户端访问

客户端使用mysql命令连接172.16.1.3，查看mysql数据库；停掉MySQL203服务器，客户端再次查看mysql数据库，验证是否可以正常访问服务。

mysql  -h172.16.1.3  -ustudent   -p123

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MySQL健康检查

一、

[root@mysql203 ~]# vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
   notification_email {
     [e-mail]
   }
   notification_email_from root@localhost
   smtp_server 172.0.0.1
   smtp_connect_timeout 30
   router_id mysql203
}

vrrp_script chk_mysql_proxy {
        script "/etc/keepalived/mysql.sh"
        interval 2  #间隔两秒
        weight 2
}
vrrp_instance VI_1 {
    state MASTER
    interface eth1
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
       172.16.1.3
    }
    track_script {
        chk_mysql_proxy

    }
}

二、

[root@mysql203 ~]# vim /etc/keepalived/mysql.sh

#!/bin/bash  
MYSQL_OK=1
function check_mysql_helth (){

    mysql -uroot -pxzw12345 -e "show status;" &>/dev/null
    if [ $? = 0 ] ;then
    MYSQL_OK=1
    else
    MYSQL_OK=0
    fi
    return $MYSQL_OK

}
check_mysql_helth
if [ $MYSQL_OK -eq 0 ]
then
  pkill keepalived
  exit 1
fi