Mysql主从复制搭建（传统模式）
mysql主从复制搭建（传统模式）
概述:
mysql 5.7.19
os : centos6.7
主库和从库分别搭建好数据库
1、主库配置
1.1 修改/etc/my.cnf配置文件
[mysqld]
log-bin = mysql-bin
server-id = 1 ####各节点必须唯一
binlog-do-db = testdb #####需要捕获binlog的数据库实例
###修改完成后，需重启数据库（如果已经开启binlog则不需要）
1.2 创建replicate用户
create user 'repl'@'%' identified by 'password';
grant replication slave on *.* to 'repl'@'%';
1.3 查看binlog状态
mysql> show master status\G
*************************** 1. row ***************************
File: mysql-bin.000006
Position: 765
Binlog_Do_DB: testdb
Binlog_Ignore_DB:
Executed_Gtid_Set:
1 row in set (0.00 sec)
1.4 备份数据库
mysqldump -uroot --proot -A -B -R --events -x --master-data=2 -S /var/run/mysqld/mysqld.sock |gzip>/tmp/all.$(date +%F).sql.gz
-A：全备
-X：锁表
2、mysql从库配置
2.1 修改/etc/my.cnf
replicate-do-db = testdb
relay-log=relay-bin
relay-log-index=relay-bin.index
skip-slave-start=true ####slave进程不随mysql启动而启动
read_only=ON ###只读数据库，但超级用户仍旧读写的，只针对普通用户
2.2 还原数据库
gunzip all.2017-09-27.sql.gz
mysql -u root -proot
2.3 开启slave
查看,master_log_file,master_log_pos值
cat /tmp/all.2017-09-27.sql |grep "CHANGE MASTER TO" |head -1
-- CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000006', MASTER_LOG_POS=154;
change master to master_host ='192.168.56.140',master_port=3306,master_user='repl',master_password='password',master_log_file='mysql-bin.000006',master_log_pos=154;
start slave; ####启动slave
2.4 查看slave状态
mysql> show slave status \G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.56.140
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000006
Read_Master_Log_Pos: 765
Relay_Log_File: relay-bin.000003
Relay_Log_Pos: 931
Relay_Master_Log_File: mysql-bin.000006
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB: testdb
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: 765
Relay_Log_Space: 1132
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:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
Master_UUID: 16f00eff-a1b7-11e7-ba2d-0800271962a3
Master_Info_File: /usr/local/mysql-5.7.19-linux-glibc2.12-x86_64/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)
3、测试
由于配置了binlog-do-db和replicate-do-db参数，只针对该实例进行只从复制
测试该实例下create、update等操作是否同步到从库上。
主从复制（gtid）
[mysqld]
gtid_mode=ON #必须
enforce-gtid-consistency #---必须
log_bin=ON ### （可选）--高可用切换，最好设置ON
log-slave-updates=ON ### （可选）--高可用切换，最好设置ON
change master to
master_host ='192.168.56.140',
master_port=3306,
master_user='repl',
master_password='password',MASTER_AUTO_POSITION = 1;
其他：
新增加实例，如果不需要初始化数据，则：
1、从库新增replcate实例，多行replicate-do-db既可，并重启
2、主库新binlog实例，多行binlog-do-db既可，并重启数据库
3、此时会新增加该实例的主从复制。