MySQL主從復(fù)制搭建流程分步實現(xiàn)

更新時間：2022年11月05日 11:38:44 作者：宏遠十一冠王

這篇文章主要介紹了MySQL的主從復(fù)制原理詳細分析，讀寫分離是基于主從復(fù)制來實現(xiàn)的。文章圍繞主題展開詳細的內(nèi)容介紹，具有一定的參考價值，需要的小伙伴可以參考一下

主從復(fù)制

主從也叫做(AB復(fù)制)，允許一個服務(wù)器從一個服務(wù)器數(shù)據(jù)庫（主服務(wù)器）的數(shù)據(jù)復(fù)制到一個或者多個MySQL數(shù)據(jù)庫服務(wù)器。

主從復(fù)制的優(yōu)點有很多，包括橫向擴展解決方案，數(shù)據(jù)安全性，數(shù)據(jù)分析，遠程數(shù)據(jù)分發(fā)。

主從搭建

作為主服務(wù)器的服務(wù)器開啟二進制日志（binlog);

下面我們來搭建主從復(fù)制的，采用3個節(jié)點來嘗試；

節(jié)點角色	主機名	Ip地址	server-id
master	master	192.168.246.132	1
slave	salve	192.168.246.134	2
slave2	salve2	192.168.246.136	3

首先需要在etc/hosts中添加IP地址和主機名之間的映射關(guān)系，啟動節(jié)點的數(shù)據(jù)庫，然后可以查看他們的server-id

show variables like 'server_id';
# 創(chuàng)建主從復(fù)制的賬號
create user 'rep1'@'192.168.246.%' identified by '123456';
grant replication slave on * .* to 'rep1'@'192.168.246.%';
flush privileges;

創(chuàng)建管理賬號

create user 'myadmin'@'192.168.246.%' identified by '123456';
grant all privileges on *.* to 'myadmin'@'192.168.246.%';
flush privileges;

在所有的節(jié)點上都啟用GTID

set @@GLOBAL.ENFORCE_GTID_CONSISTENCY = WARN;
set global ENFORCE_GTID_CONSISTENCY = ON;
set global GTID_MODE = OFF_PERMISSIVE;
set global GTID_MODE = ON_PERMISSIVE;
set global GTID_MODE = ON;

GTID全稱為Global Transaction Identifier, 即全局事務(wù)標識符。用于在binlog中標識唯一的事務(wù)，當MySQL Server在寫binlog的時候，會寫一個特殊的binlog Event，指定下一個事務(wù)的GTID。

配置主從復(fù)制的命令

注意，需要在所有的從節(jié)點都配置

change master to master_host='192.168.246.132',master_user='rep1',master_password='123456',master_auto_position=1;

在所有的從節(jié)點中開啟主從復(fù)制

start salve;

然后在從節(jié)點上查看主從復(fù)制的狀態(tài)，出現(xiàn)下面的就算成功了。

show slave status \G;

show slave status \G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for source to send event
Master_Host: 192.168.246.132
Master_User: rep1
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-binlog.000008
Read_Master_Log_Pos: 157
Relay_Log_File: salve-relay-bin.000002
Relay_Log_Pos: 379
Relay_Master_Log_File: mysql-binlog.000008
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
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: 157
Relay_Log_Space: 589
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: 71341b64-4450-11ed-90f4-000c29f2a7f4
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Replica 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: 1
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
Master_public_key_path:
Get_master_public_key: 0
Network_Namespace:
1 row in set, 1 warning (0.01 sec)

ERROR:
No query specified

測試

我們現(xiàn)在主節(jié)點上創(chuàng)建一張表并且插入一些數(shù)據(jù)，來查看從節(jié)點是否有同步數(shù)據(jù)；

create database demo2;
use demo2;
create table test1 (tid int);
insert into test1 values(123);

這個時候我們?nèi)墓?jié)點上進行查詢，這個時候我們可以看到數(shù)據(jù)已經(jīng)同步過來了。

我們還可以到我們設(shè)置的data目錄下面查看binlog，

再到數(shù)據(jù)庫里面查看，就可以查看具體的binlog信息了。

mysql> show binlog events in 'mysql-binlog.000008';
+---------------------+-----+----------------+-----------+-------------+-------------------------------------------------------------------+
| Log_name | Pos | Event_type | Server_id | End_log_pos | Info |
+---------------------+-----+----------------+-----------+-------------+-------------------------------------------------------------------+
| mysql-binlog.000008 | 4 | Format_desc | 2 | 126 | Server ver: 8.0.30, Binlog ver: 4 |
| mysql-binlog.000008 | 126 | Previous_gtids | 2 | 157 | |
| mysql-binlog.000008 | 157 | Gtid | 1 | 241 | SET @@SESSION.GTID_NEXT= '71341b64-4450-11ed-90f4-000c29f2a7f4:1' |
| mysql-binlog.000008 | 241 | Query | 1 | 352 | create database demo2 /* xid=51 */ |
| mysql-binlog.000008 | 352 | Gtid | 1 | 436 | SET @@SESSION.GTID_NEXT= '71341b64-4450-11ed-90f4-000c29f2a7f4:2' |
| mysql-binlog.000008 | 436 | Query | 1 | 554 | use `demo2`; create table test1 (tid int) /* xid=64 */ |
| mysql-binlog.000008 | 554 | Gtid | 1 | 640 | SET @@SESSION.GTID_NEXT= '71341b64-4450-11ed-90f4-000c29f2a7f4:3' |
| mysql-binlog.000008 | 640 | Query | 1 | 711 | BEGIN |
| mysql-binlog.000008 | 711 | Table_map | 1 | 763 | table_id: 94 (demo2.test1) |
| mysql-binlog.000008 | 763 | Write_rows | 1 | 803 | table_id: 94 flags: STMT_END_F |
| mysql-binlog.000008 | 803 | Xid | 1 | 834 | COMMIT /* xid=66 */ |
+---------------------+-----+----------------+-----------+-------------+-------------------------------------------------------------------+
11 rows in set (0.00 sec)