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--- doc:appunti:linux:sa:mysql_replica_master_master [2011/09/08 12:50] – [MySQL replica master-master] niccolo
+++ doc:appunti:linux:sa:mysql_replica_master_master [2019/09/30 09:51] (current) – [Configurare la replica master-master] niccolo
@@ Line 1: / Line 1: @@
 ====== MySQL replica master-master ======
-  * [[http://www.howtoforge.com/mysql5_master_master_replication_debian_etch| Up Master-Master Replication With MySQL 5 On Debian Etch]]
+Riferimenti web:
-  * [[http://www.howtoforge.com/mysql_master_master_replication|MySQL Master Master Replication]]
+  * **[[http://www.howtoforge.com/mysql5_master_master_replication_debian_etch| Up Master-Master Replication With MySQL 5 On Debian Etch]]**
+  * **[[http://www.howtoforge.com/mysql_master_master_replication|MySQL Master Master Replication]]**
+===== Configurare la replica master-master =====
+Con questa configurazione si tiene replicato **un solo database**.
+<code>
+-- Su server1
+GRANT REPLICATION SLAVE ON *.* TO 'slave2_user'@'%' IDENTIFIED BY 'slave2_password';
+FLUSH PRIVILEGES;
+CREATE DATABASE exampledb;
+CONNECT exampledb;
+CREATE TABLE clienti (
+    id INTEGER NOT NULL AUTO_INCREMENT,
+    name CHAR(100),
+    PRIMARY KEY (id)
+) ENGINE=INNODB;
+CREATE TABLE fatture (
+    id INTEGER NOT NULL AUTO_INCREMENT,
+    cliente_id INTEGER,
+    PRIMARY KEY (id),
+    FOREIGN KEY (cliente_id) REFERENCES clienti(id)
+) ENGINE=INNODB;
+SHOW TABLE STATUS;
+INSERT INTO clienti (name) VALUES ('Rigacci.Org');
+INSERT INTO fatture (cliente_id) VALUES (1);
+DELETE FROM clienti;
+vi /etc/mysql/my.cnf
+# Vedere la man page di my.cnf, che non esiste.
+/etc/init.d/mysql restart
+-- Su server2
+GRANT REPLICATION SLAVE ON *.* TO 'slave1_user'@'%' IDENTIFIED BY 'slave1_password';
+FLUSH PRIVILEGES;
+vi /etc/mysql/my.cnf
+# Vedere la man page di my.cnf, che non esiste.
+/etc/init.d/mysql restart
+</code>
+Per vedere se si sono assegnati i permessi di replica:
+<code>
+SHOW GRANTS FOR 'slave2_user'@'%';
+</code>
+Ovviamente è opportuno concedere i grant non dall'indirizzo IP wildcard **%%%%%**, ma al singolo utente/indirizzo, del tipo **%%'replication'@'116.213.177.13'%%**.
+===== Sincronizzare il db =====
+<code>
+-- Su server1
+USE exampledb;
+FLUSH TABLES WITH READ LOCK;
+SHOW MASTER STATUS;
+-- Prendere nota dello status.
+-- Fare un dump e copiarlo sull'altro host.
+UNLOCK TABLES;
+-- Su server2
+-- mysqladmin --user=root --password stop-slave
+CREATE DATABASE exampledb;
+-- mysql -u root -p exampledb < exampledb.sql
+USE exampledb;
+FLUSH TABLES WITH READ LOCK;
+SHOW MASTER STATUS;
+-- Prendere nota dello status.
+UNLOCK TABLES;
+CHANGE MASTER TO MASTER_HOST='192.168.3.71', MASTER_USER='slave2_user',
+    MASTER_PASSWORD='slave2_password', MASTER_LOG_FILE='mysql-bin.000001',
+    MASTER_LOG_POS=106;
+START SLAVE;
+SHOW SLAVE STATUS;
+-- Su server1
+STOP SLAVE;
+CHANGE MASTER TO MASTER_HOST='192.168.3.73', MASTER_USER='slave1_user',
+    MASTER_PASSWORD='slave1_password', MASTER_LOG_FILE='mysql-bin.000001',
+    MASTER_LOG_POS=2359;
+START SLAVE;
+SHOW SLAVE STATUS;
+</code>
 ===== Crash test =====