MySQL5.7基于无损复制搭建主从详解
发布时间:2022-07-07 07:43:55 所属栏目:MySql教程 来源:互联网
导读:* MySQL Replication默认都是异步(asynchronous),当主库在执行完一些事务后,是不会管备库的进度的。如果备库不幸落后,而更不幸的是主库此时又出现Crash(例如宕机),这时备库中的数据就是不完整的。简而言之,在主库发生故障的时候,我们无法使用备
* MySQL Replication默认都是异步(asynchronous),当主库在执行完一些事务后,是不会管备库的进度的。如果备库不幸落后,而更不幸的是主库此时又出现Crash(例如宕机),这时备库中的数据就是不完整的。简而言之,在主库发生故障的时候,我们无法使用备库来继续提供数据一致的服务了。 * Semi sync Replication(半同步复制)是在master上提交完成后,再传送到slave等待ack应答,仅仅在一定情况下事务的已经传递到一个slave上,但是并不确保已经在备库上执行完成,会造成最后一次events的主备不一致。 * lossless replication(无损复制)是在master提前过程中,传送到slave中等待应答。当至少一个slave request bilog后写入到relay-log并flush disk,就返回ack 2. lossless replication传输过程 3. 环境 * master 实例环境 mysql> system cat /etc/redhat-release CentOS release 6.8 (Final) mysql> system ifconfig eth0 | sed -rn '2s#^.*addr:(.*) Bca.*$#1#gp' 172.18.0.1 mysql> show variables like 'version'; +---------------+------------+ [mysqld] ########basic settings######## server-id = 210 port = 3306 user = mysql bind_address = 0.0.0.0 character_set_server=utf8mb4 skip_name_resolve = 1 datadir = /data/mysql_data log_error = error.log # slave上开启只读,避免应用误写导致主从数据不一致 read_only = on super_read_only = on #######replication settings######## master_info_repository = TABLE relay_log_info_repository = TABLE log_bin = bin.log sync_binlog = 1 log_slave_updates binlog_format = row relay_log = relay.log relay_log_recovery = 1 binlog_gtid_simple_recovery = 1 slave_skip_errors = ddl_exist_errors ######semi sync replication settings######## plugin_dir=/usr/local/mysql/lib/plugin plugin_load = "rpl_semi_sync_master=semisync_master.so;rpl_semi_sync_slave=semisync_slave.so" loose_rpl_semi_sync_master_enabled = 1 loose_rpl_semi_sync_slave_enabled = 1 loose_rpl_semi_sync_master_timeout = 5000 rpl_semi_sync_master_wait_point = AFTER_SYNC rpl_semi_sync_master_wait_for_slave_count = 1 4. 搭建无数据基于无损全复制主从 [ master原来无数据 ] * Master 创建复制所使用的用户 [ 此处ip设置为slave服务IP或者% ] mysql> grant replication slave on *.* to 'rpl'@'172.18.4.1' identified by '123'; Query OK, 0 rows affected, 1 warning (0.00 sec) * master服务器上查看binlog文件名和日志位置 mysql> show master status; +------------+----------+--------------+------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------+----------+--------------+------------------+-------------------+ | bin.000002 | 689 | | | | +------------+----------+--------------+------------------+-------------------+ mysql> insert into mytest.users select null, 'test', 'M', 42; Query OK, 1 row affected (0.01 sec) Records: 1 Duplicates: 0 Warnings: 0 mysql> update mytest.users set name='seasea' where id = 3; Query OK, 1 row affected (0.01 sec) Rows matched: 1 Changed: 1 Warnings: 0 mysql> select * from mytest.users; +----+--------+-----+-----+ | id | name | sex | age | +----+--------+-----+-----+ | 1 | tom | M | 24 | | 2 | jak | F | 32 | | 3 | seasea | M | 35 | | 4 | lisea | M | 29 | | 5 | test | M | 42 | +----+--------+-----+-----+ 5 rows in set (0.00 sec) * slave上查看 mysql> select * from mytest.users; +----+--------+-----+-----+ | id | name | sex | age | +----+--------+-----+-----+ | 1 | tom | M | 24 | | 2 | jak | F | 32 | | 3 | seasea | M | 35 | | 4 | lisea | M | 29 | | 5 | test | M | 42 | +----+--------+-----+-----+ 5 rows in set (0.00 sec) 6. 总结 以需求驱动技术,技术本身没有优略之分,只有业务之分。 (编辑:大连站长网) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |
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