MariaDB (Mysql) replication on CentOS 7
Master node: db01
Slave node: db02
** Suggestion: Create a seperate configure file and put it at /etc/my.cnf.d/99-mysql-server.conf. We don’t have to modify server.cnf file. **
- On master node:
sudo vi /etc/my.cnf.d/server.cnf
[server]
# add follows in [server] section : get binary logs
log-bin=mysql-bin
# define uniq server ID
server-id=101
sudo systemctl restart mariadb
- create user on master node:
$> mysql -u root -p
Enter password:
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 4
Server version: 10.1.14-MariaDB MariaDB Server
Copyright (c) 2000, 2016, 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
- Change setting on slave node:
sudo vi /etc/my.cnf.d/server.cnf
[server]
# add follows in [server] section : get binary logs
log-bin=mysql-bin
# define server ID (different one from Master Host)
server-id=102
# read only
read_only=1
# define own hostname
report-host=db02
sudo systemctl restart mariadb
- Dump databases on master node:
$> mysql -u root -p
Enter password:
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 4
Server version: 10.1.14-MariaDB MariaDB Server
Copyright (c) 2000, 2016, 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.000002 | 327 | | |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)
remain the window above and open the another window and execute dump
[root@www ~]# mysqldump -u root -p --all-databases --lock-all-tables --events --master-data| gzip > mysql_dump.sql.gz
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
$> scp mysql_dump.sql node01.srv.world:/tmp/
- Restore database on salve node
mysql -u root -p < /tmp/mysql_dump.sql
- Configure replica information on slave node:
mysql -u root -p
Enter password:
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 5
Server version: 10.0.19-MariaDB-log MariaDB Server
Copyright (c) 2000, 2015, 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_user='replica', master_password='password', master_log_file='mysql-bin.000002', master_log_pos=327;
MariaDB [(none)]> change master to
-> master_host='10.0.0.31', # Master Hosts's IP
-> master_user='replica', # replication ID
-> master_password='password', # replication ID's password
-> master_log_file='mysql-bin.000002', # File value confirmed on Master
-> master_log_pos=327; # Position value confirmed on Master
Query OK, 0 rows affected (0.24 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: 545
Relay_Log_File: mariadb-relay-bin.000002
Relay_Log_Pos: 755
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: 545
Relay_Log_Space: 1055
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
1 row in set (0.00 sec)
- Test your result on master node
$> mysql -u root -p
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 402
Server version: 10.1.18-MariaDB MariaDB Server
Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> create database testreplica;
Query OK, 1 row affected (0.01 sec)
MariaDB [(none)]> use testreplica;
Database changed
MariaDB [testreplica]> create table test_table( id int, name varchar(30) );
Query OK, 0 rows affected (0.02 sec)
MariaDB [testreplica]> insert into test_table values (1, 'test name');
Query OK, 1 row affected (0.00 sec)
MariaDB [testreplica]> select * from test_table;
+------+-----------+
| id | name |
+------+-----------+
| 1 | test name |
+------+-----------+
1 row in set (0.00 sec)
- Test on salve node
$> mysql
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 6
Server version: 10.1.18-MariaDB MariaDB Server
Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> use testreplica;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
MariaDB [testreplica]> select * from test_table;
+------+-----------+
| id | name |
+------+-----------+
| 1 | test name |
+------+-----------+
1 row in set (0.00 sec)
Reference:
Written on November 7, 2016