Sommaire

  1. Mise en place de la réplication
    1. Config' côté maître
    2. Config' côté esclave
    3. Notes

Reste à documenter (dans la section des Notes) :

  • le choix du server-id = 130 (comment on détermine cette valeur)

  • la nécessité ou non du paramètre MASTER_LOG_FILE='mysql-bin.000001'

  • la signification du paramètre MASTER_LOG_POS=719 (comment on détermine cette valeur)

  • le séquencement des commandes (doit-on par exemple rattacher l'esclave entre le LOCK et le UNLOCK du maître)
  • la généralisation pour l'ajout un esclave supplémentaire après coup
  • les éventuelles URL de pages web de référence utilisées

Mise en place de la réplication

Config' côté maître

Fichier /etc/mysql/conf.d/local.cnf: 

[mysqld]
language = /usr/share/mysql/french
bind-address = 0.0.0.0
log_slow_queries = /var/log/mysql/mysql-slow.log

# réplication master->slave
server-id = 130
log_bin = /var/log/mysql/mysql-bin.log
binlog_do_db = drupal

[mysqldump]
quote-names

Commandes MySQL : 

mysql> GRANT REPLICATION SLAVE ON *.* TO 'auf_repl'@'prod-db02-idneuf.vpc02.auf' IDENTIFIED BY 'xxxxxxxxxxxxxxxx';
mysql> FLUSH TABLES WITH READ LOCK;
mysql> SHOW MASTER STATUS;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000001 |      445 | drupal       |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

mysql> UNLOCK TABLES;

Config' côté esclave

Fichier /etc/mysql/conf.d/local.cnf : 

[mysqld]
language = /usr/share/mysql/french
bind-address = 0.0.0.0
log_slow_queries = /var/log/mysql/mysql-slow.log

# réplication master->slave
server-id = 131
relay-log = /var/log/mysql/mysql-relay-bin.log
log_bin = /var/log/mysql/mysql-bin.log
binlog_do_db = drupal

[mysqldump]
quote-names

Commandes MySQL : 

mysql> STOP SLAVE;
mysql> CHANGE MASTER TO MASTER_HOST='prod-db01-idneuf.vpc02.auf',MASTER_USER='auf_repl',MASTER_PASSWORD='xxxxxxxxxxxxxxxx',MASTER_LOG_FILE='mysql-bin.000001',MASTER_LOG_POS=719;
mysql> START SLAVE;
mysql> SHOW SLAVE STATUS\G;
*************************** 1. row ***************************
               Slave_IO_State: Connecting to master
                  Master_Host: prod-db01-idneuf.vpc02.auf
                  Master_User: auf_repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 719
               Relay_Log_File: mysql-relay-bin.000001
                Relay_Log_Pos: 4
        Relay_Master_Log_File: mysql-bin.000001
             Slave_IO_Running: Connecting
            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: 719
              Relay_Log_Space: 107
              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: NULL
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 2005
                Last_IO_Error: error connecting to master 'auf_repl@prod-db01-idneuf.vpc02.auf:3306' - retry-time: 60  retries: 86400
               Last_SQL_Errno: 0
               Last_SQL_Error: 
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 130

Notes