怎样简单解析mysql主从复制

2025-03-16 技术教程

怎样简单解析mysql主从复制，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。

mysql主从复制（冷备）

1.create repl user on master
grant replication slave on *.* to 'repl'@'10.124.110.116' identified by 'doudou123';

root@(none) 10:13>grant replication slave on *.* to 'repl'@'10.124.110.116' identified by 'doudou123';

Query OK, 0 rows affected (0.04 sec)

2.enable BINLOG and set server-id in my.conf and restart server
[mysqld]
log-bin = /mysql/data/3307/mysql-bin.log
server-id = 113

root@(none) 10:35>show variables like '%log_bin%';

+---------------------------------+-------------------------------+

| Variable_name | Value |

+---------------------------------+-------------------------------+

| log_bin | ON |

| log_bin_basename | /mysql/data/3307/mysql-bin.log| <==success

| log_bin_index | /mysql/data/3307/binlog.index |

| log_bin_trust_function_creators | ON |

| log_bin_use_v1_row_events | OFF |

| sql_log_bin | ON |

+---------------------------------+-------------------------------+

root@(none) 10:36>show variables like '%server_id%';

+----------------+-------+

| Variable_name | Value |

+----------------+-------+

| server_id | 113 | <==success

| server_id_bits | 32 |

+----------------+-------+

2 rows in set (0.00 sec)

3.flush tables
flush tables with read lock;

root@(none) 10:42>flush tables with read lock;

Query OK, 0 rows affected (0.00 sec)

4.show file and position
show master status;

root@(none) 14:57>show master status;

+------------------+----------+--------------+------------------+-------------------+

+------------------+----------+--------------+------------------+-------------------+

| mysql-bin.000008 | 120 | | | |

+------------------+----------+--------------+------------------+-------------------+

5.cold backup
tar -cvf 3307data.tar 3307

6.unlock tables on master
unlock tables;

root@(none) 14:18>unlock tables;

Query OK, 0 rows affected (0.02 sec)

7.set only server-id in my.conf on slave
[mysqld]
server-id = 114
vi auto.cnf
server_uuid=57735006-38f1-11e6-862c-005056beb65f

8.startup server with --skip-slave-start on slave
mysqld_multi start 3307

9.set user,ip,port,replication log and position on slave
change master to
master_host='10.124.110.113',
master_port=3307,
master_user='repl',
master_password='doudou123',
master_log_file='mysql-bin.000008',
master_log_pos=120;

mysql> change master to

-> master_host='10.124.110.113',

-> master_port=3307,

-> master_user='repl',

-> master_password='doudou123',

-> master_log_file='binlog.000008',

-> master_log_pos=120;

Query OK, 0 rows affected, 2 warnings (0.05 sec)

10.startup slave process
start slave;

mysql> start slave;

Query OK, 0 rows affected (0.01 sec)

11.show processlist on slave
show processlist \G

mysql> show processlist \G
*************************** 1. row ***************************
Id: 1
User: event_scheduler
Host: localhost
db: NULL
Command: Daemon
Time: 10060
State: Waiting on empty queue
Info: NULL
*************************** 2. row ***************************
Id: 2
User: root
Host: localhost
db: NULL
Command: Query
Time: 0
State: init
Info: show processlist
*************************** 3. row ***************************
Id: 3
User: system user
Host:
db: NULL
Command: Connect
Time: 19
State: Connecting to master <=="Waiting for master to send event" is right. and some errors because password is wrong or server_uuid is the same.
## find errors using "show slave status \G" and modify server_uuid using "auto.cnf" and find server_uuid using "show variables like '%server_uuid%';" ##
Info: NULL
*************************** 4. row ***************************
Id: 4
User: system user
Host:
db: NULL
Command: Connect
Time: 19
State: Slave has read all relay log; waiting for the slave I/O thread to update it
Info: NULL
4 rows in set (0.00 sec)

this is all right !!!!

mysql> show processlist \G

*************************** 1. row ***************************

Id: 1

User: system user

Host:

db: NULL

Command: Connect

Time: 31769

State: Slave has read all relay log; waiting for the slave I/O thread to update it

Info: NULL

*************************** 2. row ***************************

Id: 2

User: system user

Host:

db: NULL

Command: Connect

Time: 946

State: Waiting for master to send event

Info: NULL

*************************** 3. row ***************************

Id: 3

User: event_scheduler

Host: localhost

db: NULL

Command: Daemon

Time: 946

State: Waiting on empty queue

Info: NULL

*************************** 4. row ***************************

Id: 5

User: root

Host: localhost

db: test

Command: Query

Time: 0

State: init

Info: show processlist

4 rows in set (0.00 sec)

12.test change rows on master
use test
show tables;
create table repl_test(id int);
insert into repl_test values(1),(2),(3);
insert into repl_test values(4),(5),(6);
insert into repl_test values(7),(8),(9);

13.show test rows on slave
use test
show tables;

select * from repl_test;

+------+

| id |

+------+

| 1 |

| 2 |

| 3 |

| 4 |

| 5 |

| 6 |

| 7 |