mysql主从复制

1、将yum源、firewalld、Selinux、同步时间，相关设置配置完成；
2、安装mysql(mariadb);
3、准备两个虚拟机（note1,note2）;
4、配置主从配置文件/etc/my.cnf.d/server.cnf
5、在note1主服务器上创建MYSQL账户；
6、note2从服务器开启复制功能，在note2从服务器上连接至主服务器;
7、在 note1主服务器上创建数据库mydb及表格；
8、查看从服务器是否已同步；

编辑/etc/my.cnf.d/server.cnf
note1;
[mysqld]
Server-id=1
Log-bin=master-log
Skip_name_resolve=ON
note2；
【mysqld】
Server-id=2
Relay-log=relay-log
Skip_name_resolve=ON

主note1 ；创建Mysql账户
[root@note1 mysql]# mysql
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 2
Server version: 5.5.52-MariaDB MariaDB Server

Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> SHOW MASTER STATUS;
+-------------------+----------+--------------+------------------+
| File              | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+-------------------+----------+--------------+------------------+
| master-log.000003 |      245 |              |                  |
+-------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

MariaDB [(none)]> GRANT REPLICATION CLIENT, REPLICATION SLAVE ON *.* TO 'reluser'@'172.16.253.%' IDENTIFIED BY 'replpass';
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> SHOW MASTER STATUS;
+-------------------+----------+--------------+------------------+
| File              | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+-------------------+----------+--------------+------------------+
| master-log.000003 |      498 |              |                  |
+-------------------+----------+--------------+------------------+
1 row in set (0.00 sec)


MariaDB [(none)]> SHOW BINLOG EVENTS IN 'master-log.000003';
+-------------------+-----+-------------+-----------+-------------+---------------------------------------------------------------------------------------------------------+
| Log_name          | Pos | Event_type  | Server_id | End_log_pos | Info                                                                                                    |
+-------------------+-----+-------------+-----------+-------------+---------------------------------------------------------------------------------------------------------+
| master-log.000003 |   4 | Format_desc |         1 |         245 | Server ver: 5.5.52-MariaDB, Binlog ver: 4                                                               |
| master-log.000003 | 245 | Query       |         1 |         423 | GRANT REPLICATION CLIENT, REPLICATION SLAVE ON *.* TO 'reluser'@'172.16.253.%' IDENTIFIED BY 'replpass' |
| master-log.000003 | 423 | Query       |         1 |         498 | FLUSH PRIVILEGES                                                                                        |
+-------------------+-----+-------------+-----------+-------------+---------------------------------------------------------------------------------------------------------+
3 rows in set (0.00 sec)

note2;开启从服务器复制功能；
[root@note2 mysql]# mysql
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 2
Server version: 5.5.52-MariaDB MariaDB Server

Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> help CHANGE MASTER TO
Name: 'CHANGE MASTER TO'
Description:
Syntax:
CHANGE MASTER TO option [, option] ...
MariaDB [(none)]> CHANGE MASTER TO MASTER_HOST='172.16.253.10',MASTER_USER='reluser',MASTER_PASSWORD='replpass',MASTER_LOG_FILE='master_log.000003',MASTER_LOG_POS=496; 
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> SHOW SLAVE STATUS\G ---查看从服务器状态；
*************************** 1. row ***************************
               Slave_IO_State: 
                  Master_Host: 172.16.253.10
                  Master_User: reluser
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: master_log.000003
          Read_Master_Log_Pos: 496
               Relay_Log_File: relay-log.000001
                Relay_Log_Pos: 4
        Relay_Master_Log_File: master_log.000003
             Slave_IO_Running: No------
            Slave_SQL_Running: No----没有真正启动
              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: 496
              Relay_Log_Space: 245
              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: NULL
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: 0
1 row in set (0.00 sec)
MariaDB [(none)]> START SLAVE
    -> ;         ------------------启动复制；
Query OK, 0 rows affected (0.01 sec)
MariaDB [(none)]> SHOW SLAVE STATUS\G ---再一次查看状态；
*************************** 1. row ***************************
               Slave_IO_State: Connecting to master
                  Master_Host: 172.16.253.10
                  Master_User: reluser
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: master_log.000003
          Read_Master_Log_Pos: 496
               Relay_Log_File: relay-log.000001
                Relay_Log_Pos: 4
        Relay_Master_Log_File: master_log.000003
             Slave_IO_Running: Connecting------
            Slave_SQL_Running: Yes-----已开启
              Replicate_Do_DB: 



[root@note2 ~]# cd /var/lib/mysql/
[root@note2 mysql]# ls
aria_log.00000001  ib_logfile0  mysql               relay-log.000001  test
aria_log_control   ib_logfile1  mysql.sock          relay-log.index
ibdata1            master.info  performance_schema  relay-log.info
[root@note2 mysql]# cat master.info 
18
master-log.000003
496
172.16.253.10
repluser
replpass
3306
60
0





0
1800.000

0
[root@note2 mysql]# cat relay-log.info 
./relay-log.000001
4
master-log.000003
496

note1;主服务器创建数据库；
 MariaDB [(none)]> CREATE DATABASE mydb
    -> ;
Query OK, 1 row affected (0.00 sec)

MariaDB [(none)]> use mydb;
Database changed
MariaDB [mydb]> CREATE TABLE tbl1 (id INT,name CHAR(50));
Query OK, 0 rows affected (0.01 sec)
MariaDB [mydb]> INSERT INTO tbl1 VALUES (1,'WU MING');  
Query OK, 1 row affected (0.00 sec)

note2;从服务器查看；
MariaDB [(none)]> SHOW SLAVE STATUS\G
*************************** 1. row ***************************
               Slave_IO_State: Connecting to master
                  Master_Host: 172.16.253.10
                  Master_User: repluser
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: master-log.000003
          Read_Master_Log_Pos: 496
               Relay_Log_File: relay-log.000001
                Relay_Log_Pos: 4
        Relay_Master_Log_File: master-log.000003
             Slave_IO_Running: Connecting
            Slave_SQL_Running: Yes
           
#SHOW TABLES;
#SELECT *FROM tbl1;