MySQL Replication: - Master / Master Replication
Master / Master MySQL Replication used to achieve high-availability (HA).
1- Applications can read from both masters
2- Distributes write load across both master nodes.
3- Simple, automatic and quick failover.
Requirement: -
For MySQL Master - Master replication required two servers, it could be VPS, VMs and hosted server at any Cloud.
1- Server A (10.0.1.168) - Master-1
2- Server A (10.0.0.116) - Master -2
Step 1. Installing MySQL Server: -
Use the following command to install MySQL on both the servers:
Or you can follow this link to install MySQL: Install MySQL
root@ip-10-0-1-168:~# apt install mysql-server
Once the installation has done on Server A and Server B, Let's make the changes in my.cnf file as follow:
Step 2. Create database
Let's create a database that we will replicate:
Server A
mysql> create database db11;
Query OK, 1 row affected (0.00 sec)
Check created database using command below
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| db11 |
| mysql |
| performance_schema |
| sys |
+--------------------+
6 rows in set (0.00 sec)
Step 3. Configuration changes:
Server A
root@ip-10-0-1-168:~# vi /etc/mysql/my.cnf
Append the below config in the end of my.cnf file
[mysqld]
bind-address = 0.0.0.0
server-id = 1
log-bin="mysql-bin"
binlog-do-db=db11
binlog-ignore-db=information_schema
replicate-ignore-db=test
replicate-ignore-db=information_schema
relay-log="mysql-relay-log"
auto-increment-increment = 2
auto-increment-offset = 1
Save and Exit from the file
Restart Mysql service to apply changes
root@ip-10-0-1-168:~# systemctl restart mysql.service
Server B
Append the below config in the end of my.cnf file
root@ip-10-0-0-116:~# vi /etc/mysql/my.cnf
[mysqld]
bind-address = 0.0.0.0
server-id = 2
log-bin="mysql-bin"
binlog-do-db=db11
binlog-ignore-db=test
binlog-ignore-db=information_schema
replicate-ignore-db=information_schema
relay-log="mysql-relay-log"
auto-increment-increment = 2
auto-increment-offset = 2
Save and Exit from the file
Restart Mysql service to apply changes
root@ip-10-0-0-116:~# systemctl restart mysql.service
Step 4. Create the replicator user
you need to do is to create the replicator user in either Server A and Server B. You can do that using MySql shell using the following commands:
Server A
mysql> CREATE USER 'replicator'@'%' IDENTIFIED BY '[password]'; Query OK, 0 rows affected (0.01 sec) mysql> GRANT REPLICATION SLAVE ON *.* TO 'replicator'@'%' IDENTIFIED BY '[password]'; Query OK, 0 rows affected, 1 warning (0.00 sec)
Server B
mysql> CREATE USER 'replicator'@'%' IDENTIFIED BY '[password]';
Query OK, 0 rows affected (0.01 sec)
mysql> GRANT REPLICATION SLAVE ON *.* TO 'replicator'@'%' IDENTIFIED BY '[password]';
Query OK, 0 rows affected, 1 warning (0.00 sec)
Step 5. Backup database db11 from Server A and Restore over Server B:
Server A Take the backup of database using command below
root@ip-10-0-1-168:~# mysqldump -u root -p db11>db11.sql
Server B
First, create database with same Name (db11)
mysql> create database db11;
Query OK, 1 row affected (0.01 sec)
mysql>
Let's restore backup to this Database
root@ip-10-0-0-116:~# mysqldump -u root -p db11<db11.sql
Enter password: *****
-- MySQL dump 10.13 Distrib 5.7.18, for Linux (x86_64)
--
-- Host: localhost Database: db11
-- ------------------------------------------------------
-- Server version 5.7.18-0ubuntu0.16.04.1-log
/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;
/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
/*!40103 SET TIME_ZONE='+00:00' */;
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;
/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
-- Dump completed on 2017-06-15 10:19:10
root@ip-10-0-0-116:~#
Step 6. Configure Replication Server A to Server B
Server A- Side Configuration
we need to configure Server B as a slave of Server A. In order to do so, connect to Server A console and type the following sql command:root@ip-10-0-1-168:~# mysql -u root -p
mysql> show master status;
+------------------+----------+--------------+-------------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+-------------------------+-------------------+
| mysql-bin.000001 | 704 | | test,information_schema | |
+------------------+----------+--------------+-------------------------+-------------------+
1 row in set (0.00 sec)
You will receive output as above and we need File and position section to enable replication from Server A to Server B.
Server B- Side configuration
mysql> stop slave;
CHANGE MASTER TO MASTER_HOST = '10.0.1.168', MASTER_USER = 'replicator', MASTER_PASSWORD = '[password]', MASTER_LOG_FILE = 'mysql-bin.000001', MASTER_LOG_POS = 704; START SLAVE;
Step 7. Configure Replication Server B to Server A.
Server B- Side configuration
root@ip-10-0-0-116:~# mysql -u root -p
mysql> show master status;
+------------------+----------+--------------+-------------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+-------------------------+-------------------+
| mysql-bin.000001 | 704 | | test,information_schema | |
+------------------+----------+--------------+-------------------------+-------------------+
1 row in set (0.00 sec)
Server A- Side Configuration
mysql> stop slave;
CHANGE MASTER TO MASTER_HOST = '10.0.0.116', MASTER_USER = 'replicator', MASTER_PASSWORD = '[password]', MASTER_LOG_FILE = 'mysql-bin.000001', MASTER_LOG_POS = 704; START SLAVE;
Step 8. Verify Replication Server A to Server B and vice versa.
Server A - Check Slave status on Server A by command below
mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 10.0.0.116 Master_User: replicator Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000010 Read_Master_Log_Pos: 318 Relay_Log_File: mysql-relay-log.000002 Relay_Log_Pos: 320 Relay_Master_Log_File: mysql-bin.000010 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: test,information_schema 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: 318 Relay_Log_Space: 527 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_UUID: db835c01-50dd-11e7-88bb-12946d4e87cc Master_Info_File: /var/lib/mysql/master.info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: Executed_Gtid_Set: Auto_Position: 0 Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version: 1 row in set (0.00 sec)
Replication has been configured successfully
Server B - Check Slave status on Server B by command below
mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 10.0.1.168 Master_User: replicator Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000014 Read_Master_Log_Pos: 154 Relay_Log_File: mysql-relay-log.000002 Relay_Log_Pos: 320 Relay_Master_Log_File: mysql-bin.000014 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Replicate_Ignore_DB: information_schema 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: 154 Relay_Log_Space: 527 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_UUID: 7b0a64f2-4dbb-11e7-8349-023b8b30f372 Master_Info_File: /var/lib/mysql/master.info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: Executed_Gtid_Set: Auto_Position: 0 Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version: 1 row in set (0.00 sec)
Now Create a Table on Server A by command below:
First Select database db11
Server A:
mysql> use db11
Database changed
mysql> CREATE TABLE pet (name VARCHAR(20), owner VARCHAR(20),species VARCHAR(20), sex CHAR(1), birth DATE, death DATE); Query OK, 0 rows affected (0.03 sec)Check created table by hitting below command
mysql> show tables; +----------------+ | Tables_in_db11 | +----------------+ | pet | +----------------+ 1 row in set (0.00 sec)
Let's check this table on Server B:
Server B: Change database db11 using command below
mysql> use db11
Database changed
mysql> show tables; +----------------+ | Tables_in_db11 | +----------------+ | pet | +----------------+ 1 row in set (0.00 sec)
Server B:
mysql> CREATE TABLE pet11 (name VARCHAR(20), owner VARCHAR(20),species VARCHAR(20), sex CHAR(1), birth DATE, death DATE); Query OK, 0 rows affected (0.02 sec) mysql>
Let's check it over Server A
Server A-
mysql> show tables;
+----------------+
| Tables_in_db11 |
+----------------+
| pet |
| pet11 |
+----------------+
2 rows in set (0.00 sec)
No comments:
Post a Comment