Installation master/slave

Prérequis

Avoir deux serveurs mariadb

Master

Ajouter ou modifier ce qui suit dans le fichier /etc/mysql/mariadb.conf.d/50-server.cnf
```
[mysqld]
bind-address = 0.0.0.0
server-id = 1
log_bin = mysql-bin
```
Redémarrer mariadb

Création de l'utilisateur de réplication

CREATE USER 'repli'@'%' IDENTIFIED BY 'STRONGPASSWORD';
GRANT REPLICATION SLAVE ON *.* TO 'repli'@'%';
MariaDB [(none)]> show master status;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000001 |      663 |              |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.000 sec)

SLAVE

Ajouter ou modifier ce qui suit dans le fichier /etc/mysql/mariadb.conf.d/50-server.cnf
```
[mysqld]
bind-address = 0.0.0.0
server-id = 2
log_bin = mysql-bin
```
Redémarrer mariadb

Mise en place de la réplication

CHANGE MASTER TO
    -> MASTER_HOST='172.16.0.5',
    -> MASTER_USER='repli',
    -> MASTER_PASSWORD='STRONGPASSWORD',
    -> MASTER_LOG_FILE='mysql-bin.000001',
    -> MASTER_LOG_POS=663;
start slave;
SHOW SLAVE STATUS\G
*************************** 1. row ***************************
                Slave_IO_State: Waiting for master to send event
                   Master_Host: 172.16.0.5
                   Master_User: repli
                   Master_Port: 3306
                 Connect_Retry: 60
               Master_Log_File: mysql-bin.000001
           Read_Master_Log_Pos: 663
                Relay_Log_File: mysqld-relay-bin.000002
                 Relay_Log_Pos: 555
         Relay_Master_Log_File: mysql-bin.000001
              Slave_IO_Running: Yes
             Slave_SQL_Running: Yes
          Replicate_Rewrite_DB: 
               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: 663
               Relay_Log_Space: 865
               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: 1
                Master_SSL_Crl: 
            Master_SSL_Crlpath: 
                    Using_Gtid: No
                   Gtid_IO_Pos: 
       Replicate_Do_Domain_Ids: 
   Replicate_Ignore_Domain_Ids: 
                 Parallel_Mode: optimistic
                     SQL_Delay: 0
           SQL_Remaining_Delay: NULL
       Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
              Slave_DDL_Groups: 0
Slave_Non_Transactional_Groups: 0
    Slave_Transactional_Groups: 0
1 row in set (0.000 sec)

TEST

Sur le Master céer une BDD

create database test;
show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
| test               |
+--------------------+
5 rows in set (0.001 sec)

Vérifier que la base de donné créée sur le master est bien répliqué

show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
| test               |
+--------------------+
5 rows in set (0.001 sec)