Mysql

MYSQL

désactiver les logs binaires qui prennent plein de place pour rien sur une machine en prod.

vim /etc/mysql/my.cnf

commenter la ligne log-bin et la suivante.

Déplacer le répertoire de stockage des bases de données.

cp -rp /var/lib/mysql /home (par exemple)

vim /etc/mysql/my.cnf

modifier la ligne "datadir"

#datadir                                        = /var/lib/mysql
datadir                                         = /home/mysql

mysqladmin -u root flush-privileges password ******** --socket=/var/run/mysqld/mysqld-ns37682.sock

---

connection en local

mysql -u root -p******* -E --socket=/var/run/mysqld/mysqld-ns37682.sock
user
password
-E =>  presentation à la vertical plutôt qu'a l'horizontal
--socket => permet de prendre un autre service que celui par defaut

---

replication

la doc sur le site de mysql => [1]

On lock les tables en écriture

mysql> FLUSH TABLES WITH READ LOCK;

On lance le dump de toutes les données.

mysqldump -u USER -p****** -A > /PATH/TO/DUMPFILE

On récupère la position du master

mysql> SHOW MASTER STATUS;
*************************** 1. row ***************************
            File: ns20587.000012
        Position: 8330324
    Binlog_Do_DB:
Binlog_Ignore_DB:
1 row in set (0.00 sec)

autre présentations en fonction de la façon de se loguer ( -E )

mysql> SHOW MASTER STATUS;
+----------------+----------+--------------+------------------+
| File           | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+----------------+----------+--------------+------------------+
| ns20587.000012 |  8707042 |              |                  |
+----------------+----------+--------------+------------------+

On unlock les tables

mysql> UNLOCK TABLES;

On restaure les données sur le slave après les y avoir transféré.

mysql -u USER -p******** < /PATH/TO/DUMPFILE

On donne les au slave les instructions pour qu'il aille chercher sur le master les infos dans les fichiers bin.

mysql> CHANGE MASTER TO MASTER_HOST='HOSTNAME', MASTER_USER='USER', MASTER_PASSWORD='********', MASTER_LOG_FILE='FILE', MASTER_LOG_POS=POSITION;

On peu ensuite vérifier que le slave se synchronise bien (l'autre vue sans le -E est illisible pour moi ...)

mysql> show slave status;
*************************** 1. row ***************************
             Slave_IO_State: Waiting for master to send event
                Master_Host: vpn.talevas.com
                Master_User: root
                Master_Port: 3306
              Connect_Retry: 60
            Master_Log_File: ns20587.000012
        Read_Master_Log_Pos: 8726915
             Relay_Log_File: mysqld-relay-bin.000008
              Relay_Log_Pos: 1508334
      Relay_Master_Log_File: ns20587.000012
           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: 8726915
            Relay_Log_Space: 1508334
            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

mysql> show slave status;
 +----------------------------------+-----------------+-------------+-------------+---------------+-----------------+---------------------+-------------------------+---------------+-----------------------+------------------+-------------------+-----------------+---------------------+--------------------+------------------------+-------------------------+-----------------------------+------------+------------+--------------+---------------------+-----------------+-----------------+----------------+---------------+--------------------+--------------------+--------------------+-----------------+-------------------+----------------+-----------------------+
| Slave_IO_State                   | Master_Host     | Master_User | Master_Port | Connect_Retry | Master_Log_File | Read_Master_Log_Pos | Relay_Log_File          | Relay_Log_Pos | Relay_Master_Log_File | Slave_IO_Running | Slave_SQL_Running | Replicate_Do_DB | Replicate_Ignore_DB | Replicate_Do_Table | Replicate_Ignore_Table | Replicate_Wild_Do_Table | Replicate_Wild_Ignore_Table | Last_Errno | Last_Error | Skip_Counter | Exec_Master_Log_Pos | Relay_Log_Space | Until_Condition | Until_Log_File | Until_Log_Pos | Master_SSL_Allowed | Master_SSL_CA_File | Master_SSL_CA_Path | Master_SSL_Cert | Master_SSL_Cipher | Master_SSL_Key | Seconds_Behind_Master |
+----------------------------------+-----------------+-------------+-------------+---------------+-----------------+---------------------+-------------------------+---------------+-----------------------+------------------+-------------------+-----------------+---------------------+--------------------+------------------------+-------------------------+-----------------------------+------------+------------+--------------+---------------------+-----------------+-----------------+----------------+---------------+--------------------+--------------------+--------------------+-----------------+-------------------+----------------+-----------------------+

| Waiting for master to send event | vpn.talevas.com | root | 3306 | 60 | ns20587.000012 | 8736018 | mysqld-relay-bin.000008 | 1517437 | ns20587.000012 | Yes | Yes | | | | | | | 0 | | 0 | 8736018 | 1517437 | None | | 0 | No | | | | | | 0 |

+----------------------------------+-----------------+-------------+-------------+---------------+-----------------+---------------------+-------------------------+---------------+-----------------------+------------------+-------------------+-----------------+---------------------+--------------------+------------------------+-------------------------+-----------------------------+------------+------------+--------------+---------------------+-----------------+-----------------+----------------+---------------+--------------------+--------------------+--------------------+-----------------+-------------------+----------------+-----------------------+