mysql 主从复制

主从复制

环境

两台机器：

主：[root@master ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN group default qlen 1000
    link/ether 00:0c:29:f1:68:6c brd ff:ff:ff:ff:ff:ff
    inet 192.168.10.17/24 brd 192.168.10.255 scope global noprefixroute ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::27c:fe2e:4d0a:cad2/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
备：[root@save-1 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN group default qlen 1000
    link/ether 00:0c:29:cb:cf:38 brd ff:ff:ff:ff:ff:ff
    inet 192.168.10.18/24 brd 192.168.10.255 scope global noprefixroute ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fecb:cf38/64 scope link 
       valid_lft forever preferred_lft forever

两台数据库执行以下sql语句

mysql> create database test;
mysql>  use test;
Database changed
mysql> create table emp (empno numeric(4) not null,ename varchar(10),job varchar(9),mgr numeric(4),hiredate datetime,sal numeric(7, 2),comm numeric(7, 2),deptno numeric(2));
Query OK, 0 rows affected (0.11 sec)

mysql>  select * from emp;

　修改主节点上配置文件并重启

[root@master ~]# cat /etc/my.cnf 
[mysqld]
datadir=/usr/local/mysql/data
socket=/usr/local/mysql/mysql.sock
symbolic-links=0
log-bin=mysql-bin-master #启用二进制日志
server-id=1	#本机数据库ID 标示
binlog-do-db=test	#可以被从服务器复制的库, 二进制需要同步的数据库名
binlog-ignore-db=mysql  #不可以被从服务器复制的库
 
[mysqld_safe]
log-error=/usr/local/mysql/logs/error.log
pid-file=/usr/local/mysql/mysql.pid
 
[client]
socket=/usr/local/mysql/mysql.sock


[root@master ~]# /etc/init.d/mysqld restart   重启
Shutting down MySQL.. SUCCESS! 
Starting MySQL.. SUCCESS! 

　　创建用户并刷新授权表

mysql>  grant replication slave on *.* to slave@192.168.19.75 identified by "123456";   用户创建错了
Query OK, 0 rows affected, 1 warning (0.02 sec)
 
mysql> grant replication slave on *.* to slave@192.168.10.18 identified by "123456";
Query OK, 0 rows affected, 1 warning (0.12 sec)

mysql> drop user slave@192.168.19.75 ;   删除错的用户
Query OK, 0 rows affected (0.01 sec)

mysql> select * from mysql.user where user='slave'\G;
*************************** 1. row ***************************
                  Host: 192.168.10.18
                  User: slave
           Select_priv: N
           Insert_priv: N
           Update_priv: N
           Delete_priv: N
           Create_priv: N
             Drop_priv: N
           Reload_priv: N
         Shutdown_priv: N
          Process_priv: N
             File_priv: N
            Grant_priv: N
       References_priv: N
            Index_priv: N
            Alter_priv: N
          Show_db_priv: N
            Super_priv: N
 Create_tmp_table_priv: N
      Lock_tables_priv: N
          Execute_priv: N
       Repl_slave_priv: Y
      Repl_client_priv: N
      Create_view_priv: N
        Show_view_priv: N
   Create_routine_priv: N
    Alter_routine_priv: N
      Create_user_priv: N
            Event_priv: N
          Trigger_priv: N
Create_tablespace_priv: N
              ssl_type: 
            ssl_cipher: 
           x509_issuer: 
          x509_subject: 
         max_questions: 0
           max_updates: 0
       max_connections: 0
  max_user_connections: 0
                plugin: mysql_native_password
 authentication_string: *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9
      password_expired: N
 password_last_changed: 2020-04-15 10:07:09
     password_lifetime: NULL
        account_locked: N
1 row in set (0.00 sec)

ERROR: 
No query specified

mysql> flush privileges;   刷新用户授权表
Query OK, 0 rows affected (0.01 sec)

　　从库修改配置文件并重启

[root@save-1 ~]# cat /etc/my.cnf
[mysqld]
datadir=/usr/local/mysql/data
socket=/usr/local/mysql/mysql.sock
symbolic-links=0
server-id=2    #添加server-id
 
[mysqld_safe]
log-error=/usr/local/mysql/logs/error.log
pid-file=/usr/local/mysql/mysql.pid
 
[client]
socket=/usr/local/mysql/mysql.sock
[root@save-1 ~]# /etc/init.d/mysqld restart 
Shutting down MySQL.... SUCCESS! 
Starting MySQL.. SUCCESS!

　　在从从主机测试主上新建的账户

[root@save-1 ~]# mysql -uslave -h192.168.10.17 -p123456
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.18-log MySQL Community Server (GPL)

Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

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

　　主节点查看binlog 日志号

mysql>  show master status;
+-------------------------+----------+--------------+------------------+-------------------+
| File                    | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+-------------------------+----------+--------------+------------------+-------------------+
| mysql-bin-master.000001 |     1359 | test         | mysql            |                   |
+-------------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

　　从节点设置连接主节点并开启主从复制

mysql> change master to  master_host='192.168.10.17',master_port=3306,master_user='slave',master_password='123456',master_log_file='mysql-bin-master.000001',master_log_pos=1359;
Query OK, 0 rows affected, 2 warnings (0.08 sec)
mysql> start slave;
Query OK, 0 rows affected (0.33 sec)
mysql> show slave status \G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.10.17
                  Master_User: slave
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin-master.000001
          Read_Master_Log_Pos: 1359
               Relay_Log_File: save-1-relay-bin.000002
                Relay_Log_Pos: 327
        Relay_Master_Log_File: mysql-bin-master.000001
             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: 1359
              Relay_Log_Space: 535
              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: 88976e86-7d66-11ea-967b-000c29f1686c
             Master_Info_File: /usr/local/mysql/data/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave 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: 0
         Replicate_Rewrite_DB: 
                 Channel_Name: 
           Master_TLS_Version: 
1 row in set (0.00 sec)

　　主节点查看

mysql> show processlist \G
*************************** 1. row ***************************
     Id: 3
   User: root
   Host: localhost
     db: NULL
Command: Query
   Time: 0
  State: starting
   Info: show processlist
*************************** 2. row ***************************
     Id: 5
   User: slave
   Host: 192.168.10.18:51098
     db: NULL
Command: Sleep
   Time: 3353
  State: 
   Info: NULL
*************************** 3. row ***************************
     Id: 6
   User: slave
   Host: 192.168.10.18:51100
     db: NULL
Command: Binlog Dump
   Time: 119
  State: Master has sent all binlog to slave; waiting for more updates
   Info: NULL
3 rows in set (0.00 sec)

　　主节点插入数据测试

mysql> insert into test.emp values (7499, 'ALLEN', 'SALESMAN', 7698, '1981-02-20', 1600, 300, 30);
Query OK, 1 row affected (0.01 sec)

　　从节点查看

mysql> select * from emp;
+-------+-------+----------+------+---------------------+---------+--------+--------+
| empno | ename | job      | mgr  | hiredate            | sal     | comm   | deptno |
+-------+-------+----------+------+---------------------+---------+--------+--------+
|  7369 | SMITH | CLERK    | 7902 | 1980-12-17 00:00:00 |  800.00 |   NULL |     20 |
|  7499 | ALLEN | SALESMAN | 7698 | 1981-02-20 00:00:00 | 1600.00 | 300.00 |     30 |
+-------+-------+----------+------+---------------------+---------+--------+--------+
2 rows in set (0.00 sec)