主服务器

开启binlog日志

[mysqld]

log-bin=master

log-bin-index=master

server-id=1

1.全备:

[root@localhost data]# mysqldump -u root -p123 --all-databases > /tmp/all.sql

2.将全备拷贝给从机，并在从机完全恢复，保证主从数据的一致性

3.授权从机可以从主机复制数据

mysql> grant replication slave on *.* to slave@'192.168.10.201' identified by '123';

4.查看主服务器日志状态：

mysql> show master status\G

*************************** 1. row ***************************

File: master.000001

Position: 120

Binlog_Do_DB:

Binlog_Ignore_DB:

Executed_Gtid_Set:

1 row in set (0.00 sec)

从服务器

1.完全恢复

[root@localhost mysql]# mysql -u root < /root/all.sql

2.测试登陆主服务器

[root@localhost mysql]# mysql -u slave -p123 -h 192.168.10.200

3.配置文件

[root@localhost data]# cat /etc/my.cnf

[mysqld]

server-id=2

4.配置连接服务器

mysql> change master to

-> master_host='192.168.10.200',

-> master_user='slave',

-> master_password='123',

-> master_log_file='master.000001',

-> master_log_pos=120;

mysql> start slave；

mysql> show slave status\G

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

调换两台主机的身份再做一次

从服务器：

开启binlog日志：

[root@localhost data]# cat /etc/my.cnf

[mysqld]

server-id=2

log-bin=slave

log-bin-index=slave

给主服务器授权

mysql> grant replication slave on *.* to master@'192.168.10.200' identified by '123' ；

主服务器：

mysql> change master to

-> master_host='192.168.10.201',

-> master_user='master',

-> master_password='123',

-> master_log_file='slave.000001',

-> master_log_pos=333;

mysql> start slave;

mysql> show slave status\G

=====================================================

在mysql互主的基础上配置keepalived(两台mysql都要安装)

root@localhost smb]# tar -xvf keepalived-1.2.24.tar.gz -C /usr/local/src/

[root@localhost ~]# cd /usr/local/src/keepalived-1.2.24/

[root@localhost keepalived-1.2.24]#./configure --prefix=/ --mandir=/usr/local/share/man/

[root@localhost keepalived-1.2.24]# make

[root@localhost keepalived-1.2.24]# make install

[root@localhost keepalived-1.2.24]# cd /etc/keepalived/

! Configuration File for keepalived

global_defs { #全局定义主要设置 keepalived 的通知机制和标识

notification_email {

root@localhost

}

notification_email_from keepalived@localhost

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id test

}

vrrp_instance VI_1 { #VRRP(虚拟路由冗余协议)实例配置

state MASTER #另一个 Director 标记为 BACKUP！！！

interface eth0 #实例绑定的网卡

virtual_router_id 51 #VRID 虚拟路由标识 00-00-5e-00-01-{VRID}

priority 150 #优先级高为master，master 至少要高于 backup 50 ！！！

advert_int 1 #检查间隔

authentication {

auth_type PASS 验证:主备之间做身份验证 主备之间一定一致

auth_pass 1111

}

virtual_ipaddress { 浮动ip

192.168.10.222/24

}

}

==================================================

virtual_server 192.168.0.200 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 192.168.0.219 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

}

}

}

====================================================

 

[root@localhost keepalived]# scp keepalived.conf 192.168.10.201:/etc/keepalived/

拷贝后,修改配置文件

state BACKUP

priority 100

2台mysql上，启动Keepalived服务

[root@localhost keepalived]# service keepalived start

测试2台mysql的故障转移

==================================

MYSQL ERROR 2003 (HY000): Can't connect to MySQL server on '192.168.10.210' (111) 解决方法

今天在测试MySQL的连接时候，发现连接不通过，并报错ERROR 2003 (HY000): Can't connect to mysql server on '192.168.10.210' (111)

测试代码：

require 'mysql2'

client = Mysql2::Client.new(:host=>"192.168.10.210",:username=>'root',:password=>"root")

puts results = client.query("show databases;")

谷歌了一下之后，原来是在mysql的my.cnf中有下面一段代码：

# Instead of skip-networking the default is now to listen only on

# localhost which is more compatible and is not less secure.

bind-address = 127.0.0.1 #这里默认监听本地localhost

如果要让mysql监听到其他的地址，可以将bind-address = 127.0.0.1注释掉。

或者将bind-address = 0.0.0.0监听所有的地址

屏蔽掉之后再次运行代码又出现：Host '192.168.10.83' is not allowed to connect to this MySQL server

这里写图片描述

解决方法：

如果想让192.168.10.83能够连接到本地的这个数据库，要让数据库给其分配权限,登录mysql，执行:(username 和 password是登录mysql的用户名和密码)

GRANT ALL PRIVILEGES ON *.* TO 'username'@'192.168.10.83' IDENTIFIED BY 'password' WITH GRANT OPTION;

如果要想所有的外部ip地址都能够访问使用mysql，可以执行下面：

GRANT ALL PRIVILEGES ON *.* TO 'username'@'%' IDENTIFIED BY 'password' WITH GRANT OPTION;

之后执行刷新数据库：

flush privileges;

如果要查看用户的权限，可以执行：

> show grants for 'root'@192.168.10.83

这里写图片描述