MariaDB Replikation (Ubuntu)
Noch in Bearbeitung
Server A (10.0.0.157) - Teil 1
Die Datei /etc/mysql/mariadb.conf.d/50-server.cnf editieren
sudo vi /etc/mysql/mariadb.conf.d/50-server.cnf
und folgende Zeilen hinzufügen/anpassen:
bind-address=10.0.0.157 server-id = 1 log_bin = /var/log/mysql/mysql-bin.log expire_logs_days = 10 binlog_do_db = powerdns binlog_do_db = ddns replicate-do-db = powerdns replicate-do-db = ddns log-basename = master1
Danach den Server neu starten:
sudo systemctl restart mariadb
CREATE USER 'master'@'%' IDENTIFIED BY '<password>'; GRANT REPLICATION SLAVE ON *.* TO 'master'@'%'; FLUSH PRIVILEGES;
SHOW MASTER STATUS;
+------------------+----------+--------------+------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | +------------------+----------+--------------+------------------+ | mysql-bin.000001 | 774 | | | +------------------+----------+--------------+------------------+ 1 row in set (0.000 sec)
Server B (10.0.0.167)
Die Datei /etc/mysql/mariadb.conf.d/50-server.cnf editieren
sudo vi /etc/mysql/mariadb.conf.d/50-server.cnf
und folgende Zeilen hinzufügen/anpassen:
bind-address=10.0.0.167 server-id = 2 log_bin = /var/log/mysql/mysql-bin.log expire_logs_days = 10 binlog_do_db = powerdns binlog_do_db = ddns replicate-do-db = powerdns replicate-do-db = ddns log-basename = master2
Danach den Server neu starten:
sudo systemctl restart mariadb
CREATE USER 'master'@'%' IDENTIFIED BY '<password>'; GRANT REPLICATION SLAVE ON *.* TO 'master'@'%'; FLUSH PRIVILEGES;
STOP SLAVE;
CHANGE MASTER TO MASTER_HOST = '10.0.0.157', MASTER_USER = 'master', MASTER_PASSWORD = '<password>', MASTER_LOG_FILE = 'mysql-bin.000001', MASTER_LOG_POS = 774;
START SLAVE;
SHOW MASTER STATUS;
+------------------+----------+--------------+------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | +------------------+----------+--------------+------------------+ | mysql-bin.000001 | 774 | | | +------------------+----------+--------------+------------------+ 1 row in set (0.000 sec)
Server A (10.0.0.157) - Teil 2
mysql -u root -p
STOP SLAVE;
CHANGE MASTER TO MASTER_HOST = '10.0.0.167', MASTER_USER = 'master', MASTER_PASSWORD = '<password>', MASTER_LOG_FILE = 'mysql-bin.000001', MASTER_LOG_POS = 774;
START SLAVE;
Client Status
SHOW SLAVE STATUS\G
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 79
Server version: 10.3.17-MariaDB-0+deb10u1-log Raspbian 10
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)]> SHOW SLAVE STATUS\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 10.0.0.167
Master_User: master
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000006
Read_Master_Log_Pos: 987
Relay_Log_File: master1-relay-bin.000007
Relay_Log_Pos: 1286
Relay_Master_Log_File: mysql-bin.000006
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB: powerdns,ddns
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: 987
Relay_Log_Space: 1896
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: 2
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: 3
1 row in set (0.001 sec)
Log-Files
Wenn die Konfiguration log-basename gesetzt ist, dann werden die Log-Dateien direkt im Datenverzeichnis abgelegt. Wo sich das Datenverzeichnis befindet, findet man über folgenden SQL-Befehl heraus:
SHOW VARIABLES LIKE '%datadir%';
Das sollte dann in etwa folgendes Ergebnis zurückgeben:
+---------------------------------------------+------------------------+ | Variable_name | Value | +---------------------------------------------+------------------------+ | datadir | /var/lib/mysql/ | +---------------------------------------------+------------------------+
Probleme
Could not initialize master info structure for ; more error messages can be found in the MariaDB error log
Nach Änderung der Konfiguration habe ich obenstehende Fehlermeldung beim Ausführen von
CHANGE MASTER TO MASTER_HOST = '10.0.0.157', MASTER_USER = 'master', MASTER_PASSWORD = '<password>', MASTER_LOG_FILE = 'mysql-bin.000001', MASTER_LOG_POS = 774;
bekommen. Nach Ausführen von
RESET SLAVE;
ist der Fehler nicht mehr aufgetreten.
Links
https://mariadb.com/kb/en/setting-up-replication/
https://forums.mysql.com/read.php?26,171776,205870
https://mariadb.com/kb/en/standard-replication/
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