Ubuntu 21.04
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MariaDB 10.5 : Replication
2021/05/18
 
Configure MariaDB Replication. This is the general Primary/Replica setting.
[1]
[2] Change settings and create a user for replication on MariaDB Primary Host.
root@www:~#
vi /etc/mysql/mariadb.conf.d/50-server.cnf
# line 30 : change to IP of this host

bind-address =
10.0.0.31
# line 71 : uncomment and change to any another ID

server-id =
101
# line 72 : uncomment

log_bin = /var/log/mysql/mysql-bin.log
root@www:~#
systemctl restart mariadb
root@www:~#
mysql

Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 31
Server version: 10.5.10-MariaDB-0ubuntu0.21.04.1-log Ubuntu 21.04

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
[3] Change settings on Replica Host.
root@node01:~#
vi /etc/mysql/mariadb.conf.d/50-server.cnf
# line 30 : change to IP of this host
bind-address            = 10.0.0.51

# line 71 : uncomment and change to another ID(different one from Primary Host)
server-id               = 102

# line 72 : uncomment
log_bin                 = /var/log/mysql/mysql-bin.log

# line 75 : add
# read only
read_only=1
# define own hostname
report-host=node01.srv.world

root@node01:~#
systemctl restart mariadb
[4] Get Dump-Data on Primary Primary Host.
After getting Data, transfer it to Raplica Hosts with [sftp] or [rsync] and so on.
# create a directory and get Backup Data

root@www:~#
mkdir /home/mariadb_backup

root@www:~#
mariabackup --backup --target-dir /home/mariadb_backup -u root

.....
.....
[00] 2021-05-18 03:46:52         ...done
[00] 2021-05-18 03:46:52 Redo log (from LSN 47728 to 47740) was copied.
[00] 2021-05-18 03:46:52 completed OK!
[5] On Raplica Host, Copy back Backup Data of Primary Host and Configure replication settings. After starting replication, verify replication works normally to create test database or insert test data and so on.
# stop MariaDB and remove existing data

root@node01:~#
systemctl stop mariadb

root@node01:~#
rm -rf /var/lib/mysql/*
# transfered backup data

root@node01:~#
ll mariadb_backup.tar.gz

-rw-r--r-- 1 ubuntu ubuntu 412383 May 18 04:04 mariadb_backup.tar.gz
root@node01:~#
tar zxvf mariadb_backup.tar.gz

# run prepare task before restore task (OK if [completed OK])

root@node01:~#
mariabackup --prepare --target-dir /root/mariadb_backup

.....
.....
2021-05-18  4:11:21 0 [Note] InnoDB: Starting crash recovery from checkpoint LSN=47728,47728
[00] 2021-05-18 04:11:21 Last binlog file , position 0
[00] 2021-05-18 04:11:21 completed OK!

# run restore

root@node01:~#
mariabackup --copy-back --target-dir /root/mariadb_backup

.....
.....
[01] 2021-05-18 04:11:36 Copying ./aria_log_control to /var/lib/mysql/aria_log_control
[01] 2021-05-18 04:11:36         ...done
[01] 2021-05-18 04:11:36 Copying ./xtrabackup_info to /var/lib/mysql/xtrabackup_info
[01] 2021-05-18 04:11:36         ...done
[00] 2021-05-18 04:11:37 completed OK!

root@node01:~#
chown -R mysql. /var/lib/mysql

root@node01:~#
systemctl start mariadb

# confirm [File] and [Position] value of logs of primary host

root@node01:~#
cat /root/mariadb_backup/xtrabackup_binlog_info

mysql-bin.000001        640     0-101-2

# set replication

root@node01:~#
mysql

Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 45
Server version: 10.5.10-MariaDB-0ubuntu0.21.04.1-log Ubuntu 21.04

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

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

# master_host = Primary Host IP address
# master_user = replication user ID
# master_password = replication user ID password
# master_log_file = [File] value confirmed above
# master_log_pos = [Position] value confirmed above

MariaDB [(none)]> change master to 
master_host='10.0.0.31',
master_user='replica',
master_password='password',
master_log_file='mysql-bin.000001',
master_log_pos=640;
Query OK, 0 rows affected (0.295 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: 640
                Relay_Log_File: mysqld-relay-bin.000002
                 Relay_Log_Pos: 555
         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: 640
               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: optimistic
                     SQL_Delay: 0
           SQL_Remaining_Delay: NULL
       Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
              Slave_DDL_Groups: 0
Slave_Non_Transactional_Groups: 0
    Slave_Transactional_Groups: 0
1 row in set (0.000 sec)
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