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MariaDB 10.3 : Replication2020/01/23

 
Configure MariaDB Replication settings. This configuration is general Master-Slave settings.
[1]
[2] Change settings and create a user for replication on MariaDB Matser Host.
[root@www ~]#
vi /etc/opt/rh/rh-mariadb103/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 ~]#
systemctl restart rh-mariadb103-mariadb

[root@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: 10.3.13-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 Slave Hosts.
[root@node01 ~]#
vi /etc/opt/rh/rh-mariadb103/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=102
# read only yes

read_only=1
# define own hostname

report-host=node01.srv.world
[root@node01 ~]#
systemctl restart rh-mariadb103-mariadb

[4] Get Dump-Data on MariaDB Master Host.
After getting Data, transfer it to Slave 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 -p password

[00] 2020-01-22 22:47:06 Connecting to MySQL server host: localhost, user: root, password: set, port: not set, socket: not set
[00] 2020-01-22 22:47:06 Using server version 10.3.13-MariaDB-log
[00] 2020-01-22 22:47:06 mariabackup based on MariaDB server 10.3.13-MariaDB Linux (x86_64)
.....
.....
[00] 2020-01-22 22:47:33 Redo log (from LSN 1639826 to 1639835) was copied.
[00] 2020-01-22 22:47:33 completed OK!
[5] On Slave Host, Copy back Backup Data of Master Host and Configure replication settings. After starting replication, make sure replication works normally to create test database or insert test data and so on.
# stop MariaDB and remove existing data

[root@node01 ~]#
systemctl stop rh-mariadb103-mariadb

[root@node01 ~]#
rm -rf /var/opt/rh/rh-mariadb103/lib/mysql/*
# transferred backup data

[root@node01 ~]#
ll mariadb_backup.tar.gz

-rw-r--r--. 1 root root 212896 Jan 22 22:48 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

[00] 2020-01-22 22:50:17 mariabackup based on MariaDB server 10.3.13-MariaDB Linux (x86_64)
[00] 2020-01-22 22:50:17 cd to /root/mariadb_backup/
.....
.....
[00] 2020-01-22 22:50:17 Last binlog file , position 0
[00] 2020-01-22 22:50:17 completed OK!

# run restore

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

[00] 2020-01-22 22:51:41 mariabackup based on MariaDB server 10.3.13-MariaDB Linux (x86_64)
[01] 2020-01-22 22:51:41 Copying ibdata1 to /var/opt/rh/rh-mariadb103/lib/mysql/ibdata1
[01] 2020-01-22 22:51:41         ...done
.....
.....
[01] 2020-01-22 22:51:41 Copying ./xtrabackup_binlog_pos_innodb to /var/opt/rh/rh-mariadb103/lib/mysql/xtrabackup_binlog_pos_innodb
[01] 2020-01-22 22:51:41         ...done
[00] 2020-01-22 22:51:41 completed OK!

[root@node01 ~]#
chown -R mysql. /var/opt/rh/rh-mariadb103/lib/mysql

[root@node01 ~]#
systemctl start rh-mariadb103-mariadb
# 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: 10.3.13-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.

MariaDB [(none)]> change master to 
    -> master_host='10.0.0.31',             # Master Host IP address
    -> master_user='repl_user',             # replication user
    -> master_password='password',          # replication user password
    -> master_log_file='mysql-bin.000001',  # [File] value confirmed above
    -> master_log_pos=642;              # [Position] value confirmed above
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: 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 (0.000 sec)
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