MariaDB 10.3 : Replication2021/03/15 |
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Configure MariaDB Replication settings. This configuration is general Primary-Replica settings.
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| [1] | |
| [2] | Change settings and create a user for replication on MariaDB Primary Host. |
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[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 (uniq one) server-id=101
[root@www ~]#
[root@www ~]# systemctl restart mariadb mysql -u root -p Enter password: Welcome to the MariaDB monitor. Commands end with ; or \g. Your MariaDB connection id is 9 Server version: 10.3.27-MariaDB-log MariaDB Server 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 repl_user@'%' 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 MariaDB Replica Hosts. |
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[root@node01 ~]#
vi /etc/my.cnf.d/mariadb-server.cnf
[mysqld]
[root@node01 ~]# # add follows in [mysqld] section : get binary logs log-bin=mysql-bin # define server ID (uniq one) server-id=102 # read only yes read_only=1 # define own hostname report-host=node01.srv.world systemctl restart mariadb |
| [4] | Get Dump-Data on MariaDB 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 -p password [00] 2021-03-14 19:25:28 Connecting to MySQL server host: localhost, user: root, password: set, port: not set, socket: not set [00] 2021-03-14 19:25:28 Using server version 10.3.27-MariaDB-log mariabackup based on MariaDB server 10.3.27-MariaDB Linux (x86_64) ..... ..... [00] 2021-03-14 19:25:31 ...done [00] 2021-03-14 19:25:31 Redo log (from LSN 4422294 to 4422303) was copied. [00] 2021-03-14 19:25:31 completed OK! |
| [5] | On Replica Host, Copy back Backup Data of Primary Host and Configure replication settings. After starting replication, confirm the 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 root root 605425 Mar 14 19:28 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 mariabackup based on MariaDB server 10.3.27-MariaDB Linux (x86_64) [00] 2021-03-14 19:29:29 cd to /root/mariadb_backup/ [00] 2021-03-14 19:29:29 This target seems to be not prepared yet. ..... ..... 2021-03-14 19:29:29 0 [Note] InnoDB: Starting crash recovery from checkpoint LSN=4422294 [00] 2021-03-14 19:29:30 Last binlog file , position 0 [00] 2021-03-14 19:29:30 completed OK! # run restore [root@node01 ~]# mariabackup --copy-back --target-dir /root/mariadb_backup mariabackup based on MariaDB server 10.3.27-MariaDB Linux (x86_64) [01] 2021-03-14 19:30:06 Copying ibdata1 to /var/lib/mysql/ibdata1 [01] 2021-03-14 19:30:06 ...done ..... ..... [01] 2021-03-14 19:30:07 Copying ./xtrabackup_info to /var/lib/mysql/xtrabackup_info [01] 2021-03-14 19:30:07 ...done [00] 2021-03-14 19:30:07 completed OK! # confirm [File] and [Position] value of master log [root@node01 ~]# cat /root/mariadb_backup/xtrabackup_binlog_info mysql-bin.000001 642 0-101-2 # set replication [root@node01 ~]# mysql -u root -p Enter password: Welcome to the MariaDB monitor. Commands end with ; or \g. Your MariaDB connection id is 9 Server version: 10.3.27-MariaDB-log MariaDB Server 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=(Master Host IP address) # master_user=(replication user) # master_password=(replication user 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='repl_user', master_password='password', master_log_file='mysql-bin.000001', master_log_pos=642; Query OK, 0 rows affected (0.191 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: repl_user Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 642 Relay_Log_File: mariadb-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: 642 Relay_Log_Space: 866 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 Slave_DDL_Groups: 0 Slave_Non_Transactional_Groups: 0 Slave_Transactional_Groups: 0 1 row in set (0.001 sec) |
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