Mysql主从环境配置

Posted 2021-02-19 Wshile

mysql主从环境配置

采用Gtid的主从同步方式

操作步骤

主从配置前准备

需要打开如下配置

# GTID:
gtid_mode                   = on
enforce_gtid_consistency    = on

导出单个数据库

[root@server01 ~]# mysqldump -uroot -p --databases manage_db > 1.sql
Enter password: 
Warning: A partial dump from a server that has GTIDs will by default include the GTIDs of all transactions, even those that changed suppressed parts of the database. If you don‘t want to restore GTIDs, pass --set-gtid-purged=OFF. To make a complete dump, pass --all-databases --triggers --routines --events. 

向slave库输入数据

[root@server02 ctchat]# mysql -uroot -p111111 < 1.sql 
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 1840 (HY000) at line 24: @@GLOBAL.GTID_PURGED can only be set when @@GLOBAL.GTID_EXECUTED is empty.

如果出现上面情况，需要在当前数据库执行（清空本机gtid信息,此参数慎用）

mysql> reset master;

再次执行导入

[root@server02 ctchat]# mysql -uroot -p111111 < 1.sql 
mysql: [Warning] Using a password on the command line interface can be insecure.

可以查看gtid信息（非必须）

mysql> SELECT * FROM mysql.gtid_executed;
+--------------------------------------+----------------+--------------+
| source_uuid                          | interval_start | interval_end |
+--------------------------------------+----------------+--------------+
| 51b51b0d-2626-11ea-88f0-000c2982a1b2 |              1 |            8 |
| bbaf780c-eb3a-11e9-94eb-6c92bf7e28c6 |              3 |        12881 |
| fa2f988c-eb3c-11e9-942f-6c92bf7dac7c |              1 |     33188709 |
+--------------------------------------+----------------+--------------+
3 rows in set (0.00 sec)

配置主从

 在master上创建主从复制用户

mysql> create user ‘slave1‘@‘%‘ identified by ‘123456‘;
mysql> grant replication slave on *.* to ‘slave1‘@‘%‘;
mysql> flush privileges;

 slave配置主从

mysql> CHANGE MASTER TO
MASTER_HOST = ‘10.4.7.3‘, 
MASTER_PORT = 1342, 
MASTER_USER = ‘slave1‘, 
MASTER_PASSWORD = ‘123456‘, 
MASTER_AUTO_POSITION = 1 for channel ‘db01‘;

mysql> start slave;
mysql> show slave statusG;