Linux 下mysql的双主热备
作者：浩浩哥来了
1、数据库同步设置
主机操作系统：RedHatEnterprise Linux 6
数据库版本
前提：MYSQL数据库正常启动
假设两台主机地址分别为：
ServA：192.168.18.112
ServB：192.168.18.114
注意：操作前，全文查找替换，将server A、B替换成实际IP
2、配置同步账号
在ServA上增加一个ServB可以登录的帐号：
mysql -uroot -p123456
grant all privileges on *.* [email protected] identified by ‘123456‘ with grant option;
在ServB上远程登录查看192.168.18.114使用lwh这个账号密码为123456登录上去拥有全部权限
mysql -h 192.168.18.112 -ulwh -p123456
在ServB上增加一个ServA可以登录的帐号：
mysql -uroot -p123456
grant all privileges on *.* [email protected] identified by ‘123456‘ with grant option;
在ServA上远程登录查看192.168.18.112使用lwh这个账号密码为123456登录上去拥有全部权限
3、以root用户登录ServA，修改ServA的my.cnf文件
vi /etc/my.cnf
在[mysqld]的配置项中增加如下配置：
default-character-set=utf8
log-bin=mysql-bin
relay-log=relay-bin
relay-log-index=relay-bin-index
server-id=1 表示主机号
master-host=192.168.18.114 另一台主机IP
master-user=lwh 同步的用户为lwh
master-password=123456 同步用户密码为123456
master-port=3306 主机mysql的端口是3306
master-connect-retry=30 主机重试时间为30秒
set-variable=replicate-do-db=haohaoge 同步的数据库名称为haohaoge
set-variable=replicate-do-db=aoffice 有同步多个数据库就重复写多个名称
slave-net-timeout=60 辅助连接超时为60秒
4、以root用户登录ServB，修改ServB的my.cnf文件
vi /etc/my.cnf
在[mysqld]的配置项中增加如下配置：
default-character-set=utf8
log-bin=mysql-bin
relay-log=relay-bin
relay-log-index=relay-bin-index
server-id=2 表示主机号
master-host=192.168.18.112 另一台主机IP
master-user=lwh 同步的用户为lwh
master-password=123456 同步用户密码为123456
master-port=3306 主机mysql的端口是3306
master-connect-retry=30 主机重试时间为30秒
set-variable=replicate-do-db=haohaoge 同步的数据库名称为haohaoge
set-variable=replicate-do-db=aoffice 有同步多个数据库就重复写多个名称
slave-net-timeout=60 辅助连接超时为60秒
5、重启 ServA ServB的mysql服务
service mysqld restart
用sysorg登录后台，在servA添加一个用户，B上查看是否同步。
至此完成
备注：
查看同步状态
Mysql>show slave status\G
查看这两项是否为YES，yes为正常。
Slave_IO_Running:Yes
Slave_SQL_Running:Yes
手工执行数据库同步
假设以ServA为主服务器，在ServB上重启mysql：
service mysqld restart
在ServB上用root用户登录mysql，执行：
Mysql> stop slave;
Mysql> load data from master;
Mysql> start slave;
在ServA上重启mysql：
service mysqld restart
scp /home/administrator/[email protected]:/etc/squid
scp [email protected]:/usr/local/sin.sh/home/administrator
mysql> CHANGE MASTER TO
-> MASTER_HOST=’master_host_name’,
-> MASTER_USER=’replication_user_name’,
-> MASTER_PASSWORD=’replication_password’,
-> MASTER_LOG_FILE=’recorded_log_file_name’,
-> MASTER_LOG_POS=recorded_log_position;
同步过程中出现下列问题
mysql> show slave status\G;
*************************** 1. row***************************
Slave_IO_State:
Master_Host: 192.168.18.112
Master_User: tongbu
Master_Port: 3306
Connect_Retry: 30
Master_Log_File:
Read_Master_Log_Pos: 4
Relay_Log_File: relay-bin.000001
Relay_Log_Pos: 4
Relay_Master_Log_File:
Slave_IO_Running: No
Slave_SQL_Running: Yes
Replicate_Do_DB: lwh
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 0
Relay_Log_Space: 106
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 1236
Last_IO_Error: Got fatal error 1236 from master when reading dat a from binarylog: ‘Binary log is not open‘
Last_SQL_Errno: 0
Last_SQL_Error:
1 row in set (0.00 sec)
[[email protected] ~]# tail/var/log/mysqld.log
140921 0:02:42 [Note] /usr/libexec/mysqld: ready for connections.
Version: ‘5.1.52-log‘ socket: ‘/var/lib/mysql/mysql.sock‘ port: 3306 Source distribution
140921 0:02:42 [Note] Slave SQL thread initialized, starting replication in log‘FIRST‘ at position 0, relay log ‘./relay-bin.000001‘ position: 4
140921 0:02:42 [Note] Slave I/O thread: connected to master‘[email protected]:3306‘,replication started in log ‘FIRST‘ at position 4
140921 0:02:42 [ERROR] Error reading packet from server: Binary log is not open( server_errno=1236)
140921 0:02:42 [ERROR] Slave I/O: Got fatal error1236 from master when reading data from binary log: ‘Binary log is not open‘,Error_code: 1236 翻译大概是有致命错误1236从二进制日志读取数据时从主:“二进制日志不开放，下面就进行了刷新日志
140921 0:02:42 [Note] Slave I/O thread exiting, read up to log ‘FIRST‘,position 4
140921 2:15:04 [Note] Error reading relay log event: slave SQL thread waskilled
140921 2:16:06 [Note] Slave SQL thread initialized, starting replication in log‘FIRST‘ at position 0, relay log ‘./relay-bin.000001‘ position: 4
140921 2:16:06 [Note] Slave I/O thread: connected to master‘[email protected]:3306‘,replication started in log ‘FIRST‘ at position 4
mysql> stop slave;
Query OK, 0 rows affected (0.00 sec)
mysql> flush logs;
Query OK, 0 rows affected (0.14 sec)
mysql> start slave;
Query OK, 0 rows affected (0.08 sec)
mysql> show slave status\G;
*************************** 1. row***************************
Slave_IO_State: Waiting formaster to send event
Master_Host: 192.168.18.112
Master_User: tongbu
Master_Port: 3306
Connect_Retry: 30
Master_Log_File: mysql-bin.000006
Read_Master_Log_Pos: 106
Relay_Log_File: relay-bin.000008
Relay_Log_Pos: 251
Relay_Master_Log_File: mysql-bin.000006
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB: lwh
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 106
Relay_Log_Space: 545
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
1 row in set (0.00 sec)
ERROR:
No query specified