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您现在的位置:首页 > 数据库 > Mysql数据库>>关于 MySQL异步复制

关于 MySQL异步复制

2019-06-17 17:21作者:佚名来源:cnblogs.com/yongestcat浏览:85 评论:85

Replication,复制是高可用的基础,MHA、mycat等中间件的底层都依赖复制原理

master 主实例 slave 从实例

分类:默认的异步复制,5.5版本后的半同步复制,5.6版本新增的GTID复制,5.7版本的多源复制,基于组提交的并行复制和增强半同步复制

复制方法:1.传统方法:基于binlog日志复制 2.GTID:基于事物复制

binlog可以有不同的格式:基于语句、基于行数据、混合(行数据复制是默认)

下面搭建下常规的异步复制

必要条件:server_id在主从之间不同;主库开启binlog,建议从库也开启方便架构扩展

首先编辑my.cnf开启binlog并设置server_id

mysql> show variables like '%log_bin%';+---------------------------------+---------------------------------------+| Variable_name                   | Value                                 |+---------------------------------+---------------------------------------+| log_bin                         | ON                                    || log_bin_basename                | /usr/local/mysql/data/mysql-bin       || log_bin_index                   | /usr/local/mysql/data/mysql-bin.index || log_bin_trust_function_creators | OFF                                   || log_bin_use_v1_row_events       | OFF                                   || sql_log_bin                     | ON                                    |+---------------------------------+---------------------------------------+6 rows in set (0.00 sec)mysql> ^DBye[root@localhost ~]$ cat /etc/my.cnf[mysqld]datadir=/usr/local/mysql/datalog_bin=mysql-binserver_id=1[root@localhost ~]$

然后创建主从复制的用户,之前实验已经创建了scott用户,就用这个了,再赋权(因为会密码会明文保存在slave的master.info所以实际上应该单独建立个只有复制权限的用户)

mysql> grant replication slave on *.* to 'scott'@'%';

Query OK, 0 rows affected (0.00 sec)

表加锁停止修改

mysql> flush tables with read lock;Query OK, 0 rows affected (0.01 sec)mysql> show master status;+------------------+----------+--------------+------------------+-------------------+| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |+------------------+----------+--------------+------------------+-------------------+| mysql-bin.000003 |      556 |              |                  |                   |+------------------+----------+--------------+------------------+-------------------+1 row in set (0.00 sec)mysql> drop table tmp;ERROR 122

然后将主库全量备份一个传给备库,可以直接data目录打包过去(innodb不推荐)或者直接mysqldump

[root@localhost ~]$ mysqldump --all-databases -uroot -pmysql --master-data > dbdump.dbmysqldump: [Warning] Using a password on the command line interface can be insecure.[root@localhost ~]$ lsdbdump.db[root@localhost ~]$ scp dbdump.db 192.0.1.11:~The authenticity of host '192.0.1.11 (192.0.1.11)' can't be established.ECDSA key fingerprint is SHA256:pmk8Q9EnT+TugRZ5rb2bc0GP20ZV3LkeuXP/Jrw5tbs.ECDSA key fingerprint is MD5:13:d1:4a:14:3a:4d:fd:33:56:15:f9:1f:2f:44:87:2c.Are you sure you want to continue connecting (yes/no)? yesWarning: Permanently added '192.0.1.11' (ECDSA) to the list of known hosts.root@192.0.1.11's password: dbdump.db

然后在备库中应用

mysql> source dbdump.db

从库中配置主库信息

mysql> change master to    -> master_host='192.0.1.10',    -> master_user='scott',    -> master_password='tiger',    -> master_port=3306,    -> master_log_file='mysql-bin.000003',    ->  master_log_pos=556;Query OK, 0 rows affected, 2 warnings (0.01 sec)mysql>
开启同步
mysql> start slave ;Query OK, 0 rows affected (0.01 sec)mysql> show slave status\G;*************************** 1. row ***************************               Slave_IO_State: Waiting for master to send event                  Master_Host: 192.0.1.10                  Master_User: scott                  Master_Port: 3306                Connect_Retry: 60              Master_Log_File: mysql-bin.000003          Read_Master_Log_Pos: 556               Relay_Log_File: localhost-relay-bin.000002                Relay_Log_Pos: 320        Relay_Master_Log_File: mysql-bin.000003             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: 556              Relay_Log_Space: 531              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: 0Master_SSL_Verify_Server_Cert: No                Last_IO_Errno: 0                Last_IO_Error:                Last_SQL_Errno: 0               Last_SQL_Error:   Replicate_Ignore_Server_Ids:              Master_Server_Id: 1                  Master_UUID: 531fa6d1-627f-11e9-8dc7-000c297887a1             Master_Info_File: /data/master.info                    SQL_Delay: 0          SQL_Remaining_Delay: NULL      Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates           Master_Retry_Count: 86400                  Master_Bind:       Last_IO_Error_Timestamp:      Last_SQL_Error_Timestamp:                Master_SSL_Crl:            Master_SSL_Crlpath:            Retrieved_Gtid_Set:             Executed_Gtid_Set:                 Auto_Position: 0         Replicate_Rewrite_DB:                  Channel_Name:            Master_TLS_Version: 1 row in set (0.00 sec)ERROR: No query specifiedmysql>

释放主库锁定

mysql> unlock tables;

Query OK, 0 rows affected (0.00 sec)

好了验证下,主库中插入记录,从库立刻就有了

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