MariaDB : Replication2019/01/25

	Configure MariaDB Replication settings. This configuration is general Master-Slave settings.
[1]	Change settings and create a user for replication on MariaDB Matser Host.

www:~ #

vi /etc/my.cnf

# line 15: change

bind-address =

0.0.0.0

# line 37: uncomment

log-bin=mysql-bin

# line 46: change to any uniq ID

server-id=

101

www:~ #

systemctl restart mariadb

www:~ #

mysql -u root -p

Enter password:

Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 9
Server version: 10.2.15-MariaDB-log openSUSE package

Copyright (c) 2000, 2018, 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]	Install and start MariaDB Server on Slave Host, refer to here.
[3]	Change settings on MariaDB Slave Host.

node01:~ #

vi /etc/my.cnf

# line 37: uncomment

log-bin=mysql-bin

# line 46: change server ID (different one from Master Host)

server-id=

102

# line 47: add

read_only=1

# define own hostname

report-host=node01.srv.world

node01:~ #

systemctl restart mariadb

[4]	Get Dump-Data on MariaDB Master Host.

www:~ #

mysql -u root -p

Enter password:

Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 10
Server version: 10.2.15-MariaDB-log openSUSE package

Copyright (c) 2000, 2018, 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 |      640 |              |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

# remain the window above and open the another window and execute dump

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

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

[5]	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

node01:~ #

mysql -u root -p < /tmp/mysql_dump.sql

Enter password:
node01:~ #

mysql -u root -p

Enter password:

Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 10
Server version: 10.2.15-MariaDB-log openSUSE package

Copyright (c) 2000, 2018, 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 Hosts's IP
    -> master_host='10.0.0.31',
       # replication ID
    -> master_user='replica',
       # replication ID's password
    -> master_password='password',
       # File value confirmed on Master
    -> master_log_file='mysql-bin.000001',
       # Position value confirmed on Master
    -> master_log_pos=640;
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.000002
          Read_Master_Log_Pos: 342
               Relay_Log_File: node01-relay-bin.000005
                Relay_Log_Pos: 555
        Relay_Master_Log_File: mysql-bin.000002
             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: 342
              Relay_Log_Space: 865
              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
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
1 row in set (0.00 sec)

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