mysql 主从复制 实践

mysql> grant all on *.* to root@192.168.1.100 identified by '000000' with grant option;

#查看帮助信息
？ change master to
 
mysql> change master to MASTER_USER='repl';
Query OK, 0 rows affected, 2 warnings (0.03 sec)
 
mysql> change master to MASTER_PASSWORD='repl';
Query OK, 0 rows affected, 2 warnings (0.02 sec)
 
mysql> change master to MASTER_HOST='192.168.1.101';
Query OK, 0 rows affected (0.03 sec)
 
mysql> change master to MASTER_LOG_FILE='mysql-bin.000001';

mysql> start slave;
Query OK, 0 rows affected (0.01 sec)
 
mysql> show slave status\G;
 
slave_io_running:yes
slave_sql_running:yes
#表示配置成功
 
mysql> show processlist;
+----+-------------+-----------+------+---------+------+-----------------------------------------------------------------------------+------------------+
| Id | User        | Host      | db   | Command | Time | State                                                                       | Info             |
+----+-------------+-----------+------+---------+------+-----------------------------------------------------------------------------+------------------+
|  2 | root        | localhost | NULL | Query   |    0 | init                                                                        | show processlist |
| 16 | system user |           | NULL | Connect |   60 | Waiting for master to send event                                            | NULL             |
| 17 | system user |           | NULL | Connect |   60 | Slave has read all relay log; waiting for the slave I/O thread to update it | NULL             |
+----+-------------+-----------+------+---------+------+-----------------------------------------------------------------------------+------------------+

1)主库全备，备库恢复
mysqldump -uroot -p123456 --socket=/data/mysql/node1/mysqld.sock --single-transaction -A --master-data=1 > all_db.sql
mysql -utest -ptest -h(从库IP) -P3306
mysql>source all_db.sql;
2)主库授权用户
grant replication slave on *.* to repl@'(从库IP)' identified by 'repl';
3)从库配置复制
less all_db.sql|grep "change master to"
change master to master_host='(主库IP)',master_user='repl',master_password='repl',master_log_file='XXX',master_log_pos=XXX;
start stave;
show slave status\G
4)复制检验
主库：
use db1;
insert into t1 values(10);
从库：
use db1;
select * from t1;(获得数据)
主库：
drop database db2;
从库：
show databases;(显示db2被删除)
5)查看线程
主库：show processlist;(dump线程)
从库：show processlist;(IO线程、SQL线程)
6)查看日志
从库：cd /data/mysql/node1
cat master.info
cat relay-log.info

1)主库安装插件
show plugins;
install PLUGIN rpl_semi_sync_master SONAME 'semisync_master.so';
2)从库安装插件
show plugins;
INSTALL PLUGIN rpl_semi_sync_slave SONAME 'semisync_slave.so';
3)参数设置
主库：
show variables like '%semi%';
SET GLOBAL rpl_semi_sync_master_enabled=1;
从库：
SET GLOBAL rpl_semi_sync_slave_enabled=1;
4)重启主从复制
从库：
stop slave;
start slave;
5)状态检查
show global status like '%semi%';
6)复制检查
主库：
use db1;
insert into t1 values(100);
从库：
use db1;
select * from t1;(获得数据)
7)测试延迟
从库：
stop slave;
主库：
use db1;
insert into t1 values(1);(被卡10s)
set global rpl_semi_sync_master_timeout=1000;（设置主等从时间1秒）
从库：
start slave;
stop slave;
主库：
use db1;
insert into t1 values(88);(被卡1s)

#从库：
show variables like '%slave_par%';
set global slave_parallel_workers=10; 设置sql线程数为10
#重启 slave
stop slave;
start slave;
#查看线程
show processlist;(十个worker线程)

1)主库：
create database db2;
2)从库部分复制配置
配置文件中增加配置
#vim /data/mysql/my1.cnf(replicate_do_db=db2)
 
重启mysql
#mysqladmin -uroot --socket=XXX --port=3306 -p123456 shutdown
#/usr/local/mysql/bin/mysqld_safe --defaults-file=/data/mysql/my1.cnf &
 
show slave status;
显示：replicate_do_db=db2
 
3)测试
主库：
use db1;
delete from t1;
从库：
use db1;
select * from t1;(任然保留数据)
主库：
use db2;
create table user(a int,b int);
从库：
use db2;
show tables;(查看到user表)

1)从库：
#vim /data/mysql/my1.cnf(log_slave_updates)
#mysqladmin -uroot --socket=XXX --port=3306 -p123456 shutdown
#/usr/local/mysql/bin/mysqld_safe --defaults-file=/data/mysql/my1.cnf &
2)创建新实例
在主库服务器上创建一个从库2实例
#mysqladmin -uroot --socket=XXX --port=3306 -p123456 shutdown
#kill -9 (mysqld_safe进程号)
#cp -r node1 node2
#vim my.cnf(修改相关参数,端口3307)
#chown -R mysql.mysql node2
#/usr/local/mysql56/bin/mysqld_safe --defaults-file=/data/mysql/my1.cnf &
#/usr/local/mysql56/bin/mysqld_safe --defaults-file=/data/mysql/my2.cnf &
#mysqldump -utest -ptest -hXXX -P3306 -A --master-data=1 > d731.sql(dump从库1的全备)
#mysql -uroot --socket=/data/mysql/node2/mysqld.sock -p123456 < d731.sql
3)配置从1和从2的主从
从1授权：
grant replication slave on *.* to repl@'(从2IP)' identified by 'repl';
从2配置复制：
less d731.sql|grep "change master to"
change master to master_host='(从1IP)',master_user='repl',master_password='repl',master_log_file='XXX',master_log_pos=XXX;
start stave;
show slave status\G
show processlist;
4)联级复制测试
主库：
create database db3;
从1：
show databases;(获得新建库)
从2：
show databases;(获得新建库)