MySQL的主从复制和级联
jopen
11年前
记录一下mysql的主主复制和级联复制。
一、环境
主机:192.25.10.71 主机:192.25.10.73 从机:192.25.10.76 DB:Mysql 5.5.31 OS:CentOS 6.3二、架构
三、实施步骤
mysql的安装略
1.master端创建测试DB
[root@proxy1 ~]# mysql Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 1959 Server version: 5.5.31-log Source distribution Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> create database db_kenyon; Query OK, 1 row affected (0.03 sec) mysql> show databases; +--------------------+ | Database | +--------------------+ | information_schema | | db_kenyon | | mysql | | performance_schema | | test | +--------------------+ 5 rows in set (0.00 sec) mysql> use db_kenyon; Database changed mysql> create table t_kenyon(id int); Query OK, 0 rows affected (0.07 sec) mysql> insert into t_kenyon values(1),(2),(3); Query OK, 3 rows affected (0.01 sec) Records: 3 Duplicates: 0 Warnings: 0 mysql> select * from t_kenyon; +------+ | id | +------+ | 1 | | 2 | | 3 | +------+ 3 rows in set (0.00 sec) mysql> show master status; Empty set (0.00 sec) [root@localhost ~]#2.修改配置/etc/my.cnf
[mysqld] log-bin=mysql-bin server-id =1 binlog-do-db=db_kenyon innodb_data_home_dir = /usr/local/mysql/data/ innodb_log_group_home_dir = /usr/local/mysql/data/ innodb_buffer_pool_size = 256M innodb_additional_mem_pool_size = 20M innodb_log_file_size = 64M innodb_log_buffer_size = 8M innodb_flush_log_at_trx_commit = 1 innodb_lock_wait_timeout = 503.创建slave端连到master端的用户,重启master
[root@localhost ~]# /etc/init.d/mysqld restart Shutting down MySQL.. SUCCESS! Starting MySQL............ SUCCESS! [root@localhost ~]# mysql mysql>grant replication slave on *.* to repl@'192.25.10.73' identified by '123456'; mysql> flush privileges; [root@localhost ~]#4.备份master端数据,并拷贝至slave端
mysql> flush tables with read lock; Query OK, 0 rows affected (0.00 sec) mysql> show master status; +------------------+----------+---------------+-------------------------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------------+----------+---------------+-------------------------------------+-------------------+ | mysql-bin.000002 | 120 | db_kenyon | | | +------------------+----------+---------------+-------------------------------------+-------------------+ 1 row in set (0.00 sec) mysql> 另外一个session: [root@localhost log]# cd /usr/local/mysql/data [root@localhost data]# tar -zcvf backup.tar.gz db_kenyon [root@localhost ]# scp backup.tar.gz root@192.25.10.73:/usr/local/mysql/data/ --回到之前的session,从机搭完以后解锁，保证数据一致 mysql> unlock tables; Query OK, 0 rows affected (0.00 sec)5.修改slave端的数据
[mysqld] server-id = 2 master-host = 192.25.10.71 #5.5以上废弃 master-user = repl #5.5以上废弃 master-password = 123456 #5.5以上废弃 master-port = 3306 #5.5以上废弃 master-connect-retry=60 #重试时间60秒, #5.5以上废弃 replicate-do-db=db_kenyon #需要同步的库 log-slave-updates=1 #启用从库日志，这样可以设置链式复制 read-only = 1 #0表示可读写，1表示只读,但是只针对普通用户，超级用户和同步用户不受此限制6.重启slave，并指定主机检查
mysql> change master to master_host='192.25.10.71',master_user='repl',master_password='123456', master_log_file='mysql-bin.000002',master_log_pos=120 mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Master_Host: 192.25.10.71 Master_User: repluser Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000002 Read_Master_Log_Pos: 120 Relay_Log_File: localhost-relay-bin.000001 Relay_Log_Pos: 4 Relay_Master_Log_File: mysql-bin.000002 Slave_IO_Running: No Slave_SQL_Running: No Replicate_Do_DB: db_kenyon 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: 120 Relay_Log_Space: 120 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: Replicate_Ignore_Server_Ids: Master_Server_Id: 0 Master_UUID: Master_Info_File: /usr/local/mysql/data/master.info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: 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 1 row in set (0.00 sec)调整网络和mysql参数等，使两个参数：Slave_IO_Running， Slave_SQL_Running的状态为YES
7.级联过程
其他配置如上，注意级联参数log-slave-updates开启,该参数在my.cnf里值应为1，或者
mysql> show variables like 'log_slave_%'; +-------------------+-------+ | Variable_name | Value | +-------------------+-------+ | log_slave_updates | ON | +-------------------+-------+ 1 row in set (0.00 sec)8.主主的过程就是主从的基础上再以从机为主机，反向操作一遍即可。简单测试，在71上建表，73、76上都能看到该表即成功。
四、级联的性能损耗测试
使用mysqlslap
[root@proxy1 bin]# ./mysqlslap --concurrency=2 --iterations=5 --number-int-cols=10 --number-char-cols=10 -a --auto-generate-sql-guid-primary --number-of-queries=10000 --auto-generate-sql-load-type=write Benchmark Average number of seconds to run all queries: 5.324 seconds Minimum number of seconds to run all queries: 4.106 seconds Maximum number of seconds to run all queries: 6.113 seconds Number of clients running queries: 2 Average number of queries per client: 5000 每秒处理能力1878
改变concurrency,得到如下结果:
| 并发数 | 平均时间s(前者开启级联) | 每秒处理 | 损耗 |
| 2 | 5.324 | 1878 | 0.6s 11% |
| 2 | 5.912 | 1691 | 0.6s 11% |
| 10 | 2.521 | 3966 | 0.3s 12% |
| 10 | 2.828 | 3536 | 0.3s 12% |
| 50 | 2.161 | 4627 | 0.2s 7% |
| 50 | 2.331 | 4290 | 0.2s 7% |
| 100 | 2.355 | 4246 | 0.3s 11% |
| 100 | 2.618 | 3819 | 0.3s 11% |