怎样简单解析mysql主从复制

2024-04-02 19:55

短信预约 -IT技能 免费直播动态提醒

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;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| 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;