Fedora 26
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MariaDB Replication
2017/07/26
 
Configure MariaDB Replication settings. This configuration is general Master-Slave settings.
[1] Change settings and create a user for replication on MariaDB Matser Host.
[root@www ~]#
vi /etc/my.cnf.d/mariadb-server.cnf
[mysqld]
# add follows in [mysqld] section : get binary logs

log-bin=mysql-bin
# define server ID

server-id=101
[root@www ~]#
systemctl restart mariadb

[root@www ~]#
mysql -u root -p

Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 3
Server version: 10.1.25-MariaDB MariaDB Server

Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
# create user (set any password for 'password' section)

MariaDB [(none)]>
grant replication slave on *.* to replica@'%' identified by 'password';

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

Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]>
exit

Bye
[2] If Firewalld is running on Master Host, allow service like follows.
If you connect to read Slave Host, too, allow service on Slave Host, too.
[root@dlp ~]#
firewall-cmd --add-service=mysql --permanent

success
[root@dlp ~]#
firewall-cmd --reload

success
[3]
Install and start MariaDB Server on Slave Host, refer to here.
[4] Change settings on MariaDB Slave Host.
[root@node01 ~]#
vi /etc/my.cnf.d/mariadb-server.cnf
[mysqld]
# add follows in [mysqld] section : get binary logs

log-bin=mysql-bin
# define server ID (different one from Master Host)

server-id=102
# read only

read_only=1
# define own hostname

report-host=node01.srv.world
[root@node01 ~]#
systemctl restart mariadb

[5] Get Dump-Data on MariaDB Master Host.
[root@www ~]#
mysql -u root -p

Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 4
Server version: 10.1.25-MariaDB MariaDB Server

Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.

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

MariaDB [(none)]>
flush tables with read lock;

Query OK, 0 rows affected (0.00 sec)
# show status (remember File, Position value)

MariaDB [(none)]>
show master status; 

+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000001 |      609 |              |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
# remain the window above and open the another window and execute dump

[root@www ~]#
mysqldump -u root -p --all-databases --lock-all-tables --events > mysql_dump.sql

Enter password:
# back to the remained window and unlock

MariaDB [(none)]>
unlock tables;

Query OK, 0 rows affected (0.00 sec)
MariaDB [(none)]>
exit

Bye
# transfer the dump to Slave Host

[root@www ~]#
scp mysql_dump.sql node01.srv.world:/tmp/

root@node01.srv.world's password:
mysql_dump.sql 100% 515KB 514.7KB/s 00:00
[6] Configure replication settings on Slave Host. It's OK all, make sure the settings work normally to create databases on Master Host.
# import dump from Master Host

[root@node01 ~]#
mysql -u root -p < /tmp/mysql_dump.sql

Enter password:
[root@node01 ~]#
mysql -u root -p

Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 4
Server version: 10.1.25-MariaDB MariaDB Server

Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]>
change master to

    ->
master_host='10.0.0.31',
   
# Master Hosts's IP

    ->
master_user='replica',
   
# replication ID

    ->
master_password='password',
   
# replication ID's password

    ->
master_log_file='mysql-bin.000001',
   
# File value confirmed on Master

    ->
master_log_pos=609;
   
# Position value confirmed on Master

Query OK, 0 rows affected (0.58 sec)
# start replication

MariaDB [(none)]>
start slave;

Query OK, 0 rows affected (0.00 sec)
# show status

MariaDB [(none)]>
show slave status\G

*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.0.0.31
                  Master_User: replica
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 609
               Relay_Log_File: mariadb-relay-bin.000002
                Relay_Log_Pos: 537
        Relay_Master_Log_File: mysql-bin.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: 609
              Relay_Log_Space: 837
              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: 101
               Master_SSL_Crl:
           Master_SSL_Crlpath:
                   Using_Gtid: No
                  Gtid_IO_Pos:
      Replicate_Do_Domain_Ids:
  Replicate_Ignore_Domain_Ids:
                Parallel_Mode: conservative
1 row in set (0.00 sec)
 
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