Copy from a master node from mysql server running

surroundings:

192.168.205.17： as master server
192.168.205.27: as slave server

version:

OS: centos 7 1810 with mini install
mariadb-5.5.60

Joint:

When the database is running for some time, how do master-slave replication.

step:

1. 配置主服务器
2. 备份主服务器
3. 配置主恢复从服务器
4. 测试

Master 192.168.205.17

1. First install MariaDB

   [root@Master ~]#yum install mariadb-server

2. Create a data directory and sub-directories logs

   [root@Master ~]#mkdir /data/{mysql,logs}  
   [root@Master ~]#chown -R mysql:mysql /data/{mysql,logs}  

3. Modify the configuration file

   [root@Master ~]#vi /etc/my.cnf  
   [mysqld]  
   server_id=17  #服务器ID必须唯一  
   datadir=/data/mysql  #数据文件路径  
   log_bin=/data/logs/bin  #日志文件路径  
   [root@Master ~]#systemctl restart mariadb  

4. Establish a replication account, this account is the connection from the server to the main server synchronization with the account, because the synchronization of all databases, it is .

   MariaDB [(none)]> GRANT replication slave on *.* to repluser@'192.168.205.%' identified by 'centos';  

5. Backup of the database, because your database is running for some time, in order to have previous data synchronization in the past, so to back up the primary server data, and then returned to the node from which --master-data = 1 is expressed from the recover data on the node will enable the change master in sql backed up to the statement

   [root@Master ~]#mysqldump -A --single-transaction --master-data=1 -F >/data/all.mysql  

6. Copy the backup file to the slave server

   [root@Master ~]#scp /data/all.mysql 192.168.205.27:/data/  

   From the server 192.168.205.27

7. MariaDB is installed on the slave server

   [root@slave ~]#yum install mariadb-server

8. Modify the configuration file

   [root@slave ~]#vi /etc/my.cnf 
   [mysqld]  
   datadir=/data/mysql  
   read-only  #只给slave数据只读权限，当然只能限制普通帐号  
   log-bin=/data/logs/bin  
   server-id=27  #修改server-id一样和主不一样才行

9. Create data and log files folder and change the owner and group all mysql

   [root@slave ~]#mkdir /data/{mysql,logs}  
   [root@slave ~]#chown mysql:mysql /data/{mysql,logs}   

10. Open the backup file in the slave server, add the following content

    [root@salve data]#vi all.mysql  
    CHANGE MASTER TO  
    MASTER_HOST='192.168.205.17',  
    MASTER_USER='repluser',  
    MASTER_PASSWORD='centos',  
    MASTER_LOG_FILE='bin.000005',  
    MASTER_LOG_POS=245; 

11. Start Service

    [root@slave ~]#systemctl restart mariadb  

12. Direct restore the original database

    [root@slave ~]#mysql < /data/all.mysql

13. And view the status of the connection mariaDB

    [root@slave ~]#mysql  
    MariaDB [(none)]> show variables like 'server_id';  
    +---------------+-------+
    | Variable_name | Value |
    +---------------+-------+
    | server_id     | 27    |
    +---------------+-------+
    1 row in set (0.00 sec)
    MariaDB [(none)]> show variables like 'read_only';
    +---------------+-------+
    | Variable_name | Value |
    +---------------+-------+
    | read_only     | ON    |
    +---------------+-------+
    1 row in set (0.00 sec)
    MariaDB [(none)]> show slave status\G
    ...
             Slave_IO_Running: No
            Slave_SQL_Running: No
    ...

14. Starting slave I / O thread and slave SQL thread thread and view status

    MariaDB [(none)]> start slave;
    Query OK, 0 rows affected (0.00 sec)
    MariaDB [(none)]> show slave status\G
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.205.17
                  Master_User: repluser
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: bin.000005
          Read_Master_Log_Pos: 402
               Relay_Log_File: mariadb-relay-bin.000003
                Relay_Log_Pos: 523
        Relay_Master_Log_File: bin.000005
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes

15. Check whether the database synchronization over

    MariaDB [(none)]> show databases;
    +--------------------+
    | Database           |
    +--------------------+
    | information_schema |
    | hellodb            |
    | mysql              |
    | performance_schema |
    | test               |
    | zhaoli             |
    +--------------------+
    6 rows in set (0.00 sec)

16. View Network Connections, has been connected to the primary server 3306

    [root@slave data]#ss -nt
    State      Recv-Q Send-Q               Local Address:Port                              Peer Address:Port              
    ESTAB      0      96                  192.168.205.27:22                               192.168.205.1:17526              
    ESTAB      0      0                   192.168.205.27:56360                           192.168.205.17:3306 

    test

17. On the primary server, a database, and database synchronization test
    MariaDB [(none)]> Create Database DB1;
    Query the OK,. 1 Row affected (0.00 sec)
18. From the point of view there is no database server db1

    
    MariaDB [(none)]> show databases;
    +--------------------+
    | Database           |
    +--------------------+
    | information_schema |
    | db1                |
    | hellodb            |
    | mysql              |
    | performance_schema |
    | test               |
    | zhaoli             |
    +--------------------+
    7 rows in set (0.00 sec)