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6Sep/15

mysql 添加第N个从库

如果主服务器已经存在应用数据,则在进行主从复制时,做以下处理:

授权给从数据库服务器192.168.10.131
mysql> GRANT REPLICATION SLAVE ON *.* to 'rep1'@'192.168.10.131' identified by ‘password’;
(1)主数据库进行锁表操作,不让数据再进行写入动作
mysql> FLUSH TABLES WITH READ LOCK;

(2)查看主数据库状态
mysql> show master status;

(3)记录下 FILE 及 Position 的值。
将主服务器的数据文件(整个/opt/mysql/data目录)复制到从服务器,建议通过tar归档压缩后再传到从服务器解压。
或者用mysqldump的方式导出sql文件

(4)取消主数据库锁定
mysql> UNLOCK TABLES;

 

某项目mysql服务器 1主 1从 ,现在要添加一个mysql从服务器,要求主库不能停止服务,以前由于不是线上的服务器,可以在主服务器上 执行 flush tables with read lock 语句(锁表,只读),所有的表只能读不能写,然后再拷贝主库数据到新的从库服务器上,并保持数据一致性,现在只能换一种方法了,思路 新从库2拷贝老的从库1的数据!

老从库1 相关操作:

#1 停止 mysql从库,锁表,
记住 Read_Master_Log_Pos: 与 Master_Log_File: (红色字)

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mysql> stop slave;
mysql> flush tables with read lock;
mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State:
                  Master_Host: 192.168.6.53
                  Master_User: dongnan
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000097
          Read_Master_Log_Pos: 19157395
               Relay_Log_File: zabbix-slave-relay-bin.000185
                Relay_Log_Pos: 11573578
        Relay_Master_Log_File: mysql-bin.000097
             Slave_IO_Running: No
            Slave_SQL_Running: No
              Replicate_Do_DB:
          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: 19157395
              Relay_Log_Space: 19142103
              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: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
1 row in set (0.00 sec)
ERROR:
No query specified

#2 打包数据并发送到新从库2服务器上

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mysqldump -uroot -p --databases a b c d e f > data.sql
tar czvf data.tar.gz data.sql
scp zabbix_20110805.tar.gz root@192.168.6.54:/root

新从库2相关操作:

#1 更改 server-id 值不能为1,因为master 的 server-id=1

  1. vim /etc/my.cnf
  2. server-id = 3

#2 导入mysql数据库使用 --init-command="SET SQL_LOG_BIN = 0;" 参数可以避免初次导数据时产生巨大binlog文件

mysql --init-command="SET SQL_LOG_BIN = 0;" -u root -p < data.sql

#3 启动mysql数据库并change master

Exec_Master_Log_Pos 值  19157395

Master_Log_File 值 mysql-bin.000097

 

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mysql> change master to master_host='192.168.6.53',master_user='dongnan',master_password='password',master_log_file='mysql-bin.000097',master_log_pos=19157395;
mysql> start slave;  #启动slave
mysql> show slave status\G;  #显示slave 状态
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.6.53
                  Master_User: dongnan
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000097
          Read_Master_Log_Pos: 21194359
               Relay_Log_File: db1-relay-bin.000002
                Relay_Log_Pos: 2037215
        Relay_Master_Log_File: mysql-bin.000097
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          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: 21194359
              Relay_Log_Space: 2037368
              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

验证重库是否同步:

老从库1

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mysql> unlock tables;
mysql> start slave;
mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.6.53
                  Master_User: dongnan
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000097
          Read_Master_Log_Pos: 21194359
               Relay_Log_File: db1-relay-bin.000002
                Relay_Log_Pos: 2037215
        Relay_Master_Log_File: mysql-bin.000097
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes

新从库2

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mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.6.53
                  Master_User: dongnan
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000097
          Read_Master_Log_Pos: 21194359
               Relay_Log_File: db1-relay-bin.000002
                Relay_Log_Pos: 2037215
        Relay_Master_Log_File: mysql-bin.000097
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes

 

如果遇到错误尝试停止slave设置以下参数后再启动

SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1;

结束

既然主库不能动,那就去操作从库吧,新从库2拷贝老的从库1的数据!

补充:
主库创建同步账号: grant replication slave on *.* to 'repl'@'%' identified by 'repl';
[mysqld]
log_slave_updates=1 #此配置允许链式复制, 当你需要链式复制的时候,如A->B->C,你就必须在B主机上的mysql中添加一条配置
log_bin = /home/logs/mysql/mysql-bin
expire_logs_days = 7
max_binlog_size = 100M
binlog-ignore-db=mysql
binlog-ignore-db=information_schema
binlog_format=ROW

#从库配置
replicate-ignore-db=mysql
replicate-ignore-db=information_schema
slave-skip-errors=1064 1146 1062 1032

 

 

 

mysqldump -u root -pPassword --all-databases | ssh user@new_host.host.com 'cat - | mysql -u root -pPassword'

 

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