MariaDB 11.4 : Replication2025/04/22 |
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Configure MariaDB Replication. This is the general Primary/Replica setting. |
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| [1] |
On all Hosts, Install and Start MariaDB Server, refer to here. |
| [2] | Change settings and create a user for replication on MariaDB Primary Host. |
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root@www:~#
vi /etc/mysql/mariadb.conf.d/50-server.cnf # line 27 : change to IP of this host bind-address = 10.0.0.31 # line 73 : uncomment and change to any another ID server-id =
root@www:~#
root@www:~# mkdir /var/log/mysql root@www:~# chown mysql:mysql /var/log/mysql root@www:~# systemctl restart mariadb
mysql Welcome to the MariaDB monitor. Commands end with ; or \g. Your MariaDB connection id is 29 Server version: 11.4.5-MariaDB-1-log Ubuntu 25.04 Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others. Support MariaDB developers by giving a star at https://github.com/MariaDB/server 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)]> exit Bye |
| [3] | Change settings on Replica Host. |
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root@node01:~#
vi /etc/mysql/mariadb.conf.d/50-server.cnf # line 27 : change to IP of this host bind-address = 10.0.0.51 # line 73 : uncomment and change to another ID (different one from Primary Host) server-id = 102 # line 74 : uncomment log_bin = /var/log/mysql/mysql-bin.log # line 77 : add # read only read_only=1 # specify this hostname report-host=node01.srv.world gtid_domain_id=1root@node01:~# mkdir /var/log/mysql root@node01:~# chown mysql:mysql /var/log/mysql root@node01:~# systemctl restart mariadb
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| [4] | Get Dump-Data on Primary Primary Host. After getting Data, transfer it to Replica Hosts with [sftp] or [rsync] and so on. |
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# 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] 2025-04-22 04:51:06 Writing backup-my.cnf [00] 2025-04-22 04:51:06 ...done [00] 2025-04-22 04:51:06 Writing mariadb_backup_info [00] 2025-04-22 04:51:06 ...done [00] 2025-04-22 04:51:06 Redo log (from LSN 50602 to 50618) was copied. [00] 2025-04-22 04:51:06 completed OK! |
| [5] | On Replica 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. |
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# stop MariaDB and remove existing data root@node01:~# systemctl stop mariadb root@node01:~# rm -rf /var/lib/mysql/*
# transferred backup data root@node01:~# ll mariadb_backup.tar.gz -rw-r--r-- 1 ubuntu ubuntu 748061 Apr 22 04:52 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 ..... ..... 2025-04-22 4:52:57 0 [Note] InnoDB: Memory-mapped log (block size=512 bytes) 2025-04-22 4:52:57 0 [Note] InnoDB: End of log at LSN=50618 2025-04-22 4:52:57 0 [Note] InnoDB: Buffered log writes (block size=512 bytes) [00] 2025-04-22 04:52:57 Last binlog file , position 0 recovered pages: 0% 76% 100% (0.0 seconds); tables to flush: 1 0 (0.0 seconds); [00] 2025-04-22 04:52:57 completed OK! # run restore root@node01:~# mariabackup --copy-back --target-dir /root/mariadb_backup ..... ..... [01] 2025-04-22 04:53:36 Copying ./xtrabackup_binlog_pos_innodb to /var/lib/mysql/xtrabackup_binlog_pos_innodb [01] 2025-04-22 04:53:36 ...done [01] 2025-04-22 04:53:36 Copying ./mariadb_backup_info to /var/lib/mysql/mariadb_backup_info [01] 2025-04-22 04:53:36 ...done [00] 2025-04-22 04:53:36 completed OK! # set replication root@node01:~# mysql Welcome to the MariaDB monitor. Commands end with ; or \g. Your MariaDB connection id is 44 Server version: 11.4.5-MariaDB-1-log Ubuntu 25.04 Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others. Support MariaDB developers by giving a star at https://github.com/MariaDB/server Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. # master_host = Primary Host IP address # master_host=(Master Host IP address) # master_user=(replication user) # master_password=(replication user password) MariaDB [(none)]> change master to master_host='10.0.0.31', master_user='replica', master_password='password', master_use_gtid=slave_pos; Query OK, 0 rows affected (0.018 sec) # start replication MariaDB [(none)]> start slave; Query OK, 0 rows affected (0.015 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: mysqld-relay-bin.000003 Relay_Log_Pos: 641 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: 1513 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: Yes 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: Yes 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: Slave_Pos Gtid_IO_Pos: 0-101-1 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: 1 Slave_Non_Transactional_Groups: 0 Slave_Transactional_Groups: 0 Replicate_Rewrite_DB: 1 row in set (0.000 sec) |
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