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Linux 下mysql的双主热备

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标签:slave_io_running   双主数据库同步   /etc/my.cnf   mysql   slave_sql_running   

Linux 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:

 

ServA192.168.18.112

ServB192.168.18.114

 

注意:操作前,全文查找替换,将server AB替换成实际IP

 

2、配置同步账号

 

ServA上增加一个ServB可以登录的帐号:

mysql -uroot -p123456

grant all privileges on *.* tolwh@192.168.18.114 identified by ‘123456‘ with grant option;

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

 

ServB上增加一个ServA可以登录的帐号:

mysql -uroot -p123456

grant all privileges on *.* tolwh@192.168.18.114 identified by ‘123456‘ with grant option;

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

 

 

3root用户登录ServA,修改ServAmy.cnf文件

vi /etc/my.cnf

 

[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

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

 

 

 

4、以root用户登录ServB,修改ServBmy.cnf文件

vi /etc/my.cnf

 

[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

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

 

 

 

5、重启 ServA ServBmysql服务

 

service mysqld restart

 

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YESyes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

ServB上用root用户登录mysql,执行:

Mysql> stop slave;

Mysql> load data from master;

Mysql> start slave;

ServA上重启mysql

service mysqld restart

 

scp /home/administrator/news.txtroot@192.168.6.129:/etc/squid

scp remote@www.abc.com:/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)

 

[root@luowenhao ~]# 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‘tongbu@192.168.18.112:3306‘,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‘tongbu@192.168.18.112:3306‘,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


本文出自 “浩浩哥来了” 博客,谢绝转载!

Linux 下mysql的双主热备

标签:slave_io_running   双主数据库同步   /etc/my.cnf   mysql   slave_sql_running   

原文地址:http://8292004.blog.51cto.com/8282004/1576686

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