[5] MySQL – Replikacja
27 stycznia 2022Skonfiguruj replikację MySQL. Ta konfiguracja opiera się na modelu Primary-Replica.
[1] Zainstaluj i uruchom MySQL na wszystkich hostach.
[2] Na hoście [Primary (vlsr01.zicher.lab)] skonfiguruj SSL/TLS. Nie jest to wymagane dla replikacji, ale niektóre ostrzeżenia są wyświetlane podczas konfigurowania ustawienia replikacji, ponieważ hasło użytkownika do replikacji jest wysyłane w postaci zwykłego tekstu.
[3] Na hoście [Primary] zmień ustawienia oraz utwórz użytkownika do klonowania i replikacji.
[root@vlsr01 ~]# mcedit /etc/my.cnf.d/mysql-server.cnf #dodaj w sekcji [mysqld] log-bin=mysql-bin #zdefiniuj ID serwera (unikalne) server-id=101 #włącz plugin klonowania plugin-load=mysql_clone.so [root@vlsr01 ~]# systemctl restart mysqld #stwórz użytkownika replikacji [root@vlsr01 ~]# mysql -u root -p Enter password: #wpisz hasło Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 8 Server version: 8.0.26 Source distribution Copyright (c) 2000, 2021, Oracle and/or its affiliates. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> create user 'repl_user'@'%' identified by 'TajneHasło'; Query OK, 0 rows affected (0,01 sec) mysql> grant replication slave on *.* to repl_user@'%'; Query OK, 0 rows affected (0,00 sec) #stwórz użytkownika do klonowania mysql> create user 'clone_user'@'%' identified by 'TajneHasło'; Query OK, 0 rows affected (0,00 sec) mysql> grant backup_admin on *.* to 'clone_user'@'%'; Query OK, 0 rows affected (0,04 sec) mysql> flush privileges; Query OK, 0 rows affected (0,00 sec) mysql> exit Bye
[4] Na hoście [Replica (vlsr02.zicher.lab)] zmień ustawienia.
[root@vlsr02 ~]# mcedit /etc/my.cnf.d/mysql-server.cnf [mysqld] #dodaj następujące linie w sekcji [mysqld] #pobierz log binarny log-bin=mysql-bin relay-log=vlsr02-relay-bin relay-log-index=vlsr02-relay-bin #zdefiniuj ID serwera (unikalny) server-id=102 #włącz plugin plugin-load=mysql_clone.so #host tylko do odczytu read_only=1 #zdefiniuj nazwę hosta report-host=vlsr02.zicher.lab [root@vlsr02 ~]# systemctl restart mysqld [root@vlsr02 ~]# mysql -u root -p Enter password: #wpisz hasło Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 8 Server version: 8.0.26 Source distribution Copyright (c) 2000, 2021, Oracle and/or its affiliates. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> create user 'clone_user'@'%' identified by 'TajneHasło'; Query OK, 0 rows affected (0,00 sec) mysql> grant clone_admin on *.* to 'clone_user'@'%'; Query OK, 0 rows affected (0,00 sec) mysql> flush privileges; Query OK, 0 rows affected (0,00 sec) mysql> exit Bye
[5] Na hoście [Replica] uruchom zadanie klonowania, aby skopiować dane na hoście głównym i rozpocznij replikację. Po uruchomieniu replikacji sprawdź, czy replikacja działa normalnie, aby utworzyć testową bazę danych lub wstawić dane testowe.
[root@vlsr02 ~]# mysql -u root -p Enter password: #wpisz hasło Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 10 Server version: 8.0.26 Source distribution Copyright (c) 2000, 2021, Oracle and/or its affiliates. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> set global clone_valid_donor_list = '192.168.100.101:3306'; Query OK, 0 rows affected (0,00 sec) mysql> clone instance from clone_user@192.168.100.101:3306 identified by 'TajneHasło'; Query OK, 0 rows affected (5,42 sec) mysql> select ID,STATE,SOURCE,DESTINATION,BINLOG_FILE,BINLOG_POSITION from performance_schema.clone_status; ERROR 2013 (HY000): Lost connection to MySQL server during query No connection. Trying to reconnect... Connection id: 8 Current database: *** NONE *** +------+-----------+----------------------+----------------+------------------+-----------------+ | ID | STATE | SOURCE | DESTINATION | BINLOG_FILE | BINLOG_POSITION | +------+-----------+----------------------+----------------+------------------+-----------------+ | 1 | Completed | 192.168.100.101:3306 | LOCAL INSTANCE | mysql-bin.000001 | 1057 | +------+-----------+----------------------+----------------+------------------+-----------------+ 1 row in set (0,00 sec) mysql> change master to master_host='192.168.100.101', master_ssl=1, master_log_file='mysql-bin.000001', master_log_pos=1057; Query OK, 0 rows affected, 5 warnings (0,01 sec) mysql> start slave user='repl_user' password='TajneHasło'; Query OK, 0 rows affected, 2 warnings (0,01 sec) mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for source to send event Master_Host: 192.168.100.101 Master_User: repl_user Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 1057 Relay_Log_File: vlsr02-relay-bin.000002 Relay_Log_Pos: 324 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: 1057 Relay_Log_Space: 534 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: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 0 Last_SQL_Error: Replicate_Ignore_Server_Ids: Master_Server_Id: 101 Master_UUID: 2347e787-7f62-11ec-867b-000c294c0770 Master_Info_File: mysql.slave_master_info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Replica has read all relay log; waiting for more updates Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: Executed_Gtid_Set: Auto_Position: 0 Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version: Master_public_key_path: Get_master_public_key: 0 Network_Namespace: 1 row in set, 1 warning (0,00 sec)