Mysql database replication is very important issue for disaster recovery.  So you can configure step by step multiple database replication on Ubuntu 16.04. I am ready to help some tutorial  for you. Please make sure that, your server must be ssh enable without password authentication.

★ How To Install Mysql Server on Ubuntu 14.04

★ How To Install mysql Community on Windows 10

Install mysql server for both ubuntu 16.04 server.

root@Master-Serv:~# apt -y install mysql-server

Mysql master slave replication on ubuntu 16.04 prerequisite 

• Must be enable ssh authentication without password
• Must be ufw and any firewall disable for two server
• Must be comment out the below lines master and slave server

Master Server IP : 10.66.100.20
Slave Server IP : 10.66.100.21

root@Master-Serv:~#  vi /etc/mysql/mysql.conf.d/mysqld.cnf
root@Slave-Serv:~#  vi /etc/mysql/mysql.conf.d/mysqld.cnf

Must be comment below line.

#bind-address = 127.0.0.1
#skip-networking [If exit or not]

Master Server configuration on ubuntu 16.04

Step #01: Open my.cnf file then insert server id, relay log and log bin file location.

root@Master-Serv:~# vi /etc/mysql/mysql.conf.d/mysqld.cnf

Insert below all lines

[mysqld]
server-id= 1
relay-log=/var/log/mysql/mysql-relay-bin.log
log-bin=/var/log/mysql/mysql-bin.log

now mysql restart command

root@Master-Serv:~# service mysql restart

Step #02: Create replication user with grant privileges.

root@Master-Serv:~# mysql -u root -p

Then type mysql root password

mysql> CREATE database test_db;
mysql> CREATE USER 'replica'@'%' IDENTIFIED BY 'passw0rd';
mysql> GRANT ALL PRIVILEGES ON *.* TO 'replica'@'%';
mysql> FLUSH PRIVILEGES;
mysql> SHOW MASTER STATUS;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000160 | 35117 | | | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
mysql> FLUSH TABLES WITH READ LOCK;

Step #03: Open another terminal for backup all master database.

root@Master-Serv:~# mysqldump -u root -p --all-databases --master-data > masterdb.sql

Copy masterdb.sql file into slave server

root@Master-Serv:~# scp masterdb.sql root@slave-server-ip:/root/

Slave Server configuration on ubuntu 16.04

root@Slave-Serv:~# vi /etc/mysql/mysql.conf.d/mysqld.cnf

Insert below all lines

[mysqld]
server-id= 2
relay-log=/var/log/mysql/mysql-relay-bin.log
log-bin=/var/log/mysql/mysql-bin.log

now mysql restart command

root@Slave-Serv:~# service mysql restart

Step #04: Now database import into slave server.

root@Slave-Serv:~# mysql -u root -p < masterdb.sql

Type your slave server root password. Wait at lest few minutes.

Goto mysql terminal command below:

root@Slave-Serv:~# mysql -u root -p

Again type your slave server root password.

mysql> stop slave;
mysql> change master to master_host='master-server-ip', master_user='replica', master_password='replica-user-password', master_log_file='file-value-from-master', master_log_pos=log-position_from-master;
mysql> start slave;

Step #05: Goto master terminal when first time login then unlock tables command below.

mysql>  UNLOCK TABLES;

Step #06: Now check master slave replication status.

Goto slave server mysql terminal then run below command.

mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Connecting to master
                  Master_Host: 10.66.100.20
                  Master_User: replica
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000160
          Read_Master_Log_Pos: 153024467
               Relay_Log_File: mysql-relay-bin.000020
                Relay_Log_Pos: 4
        Relay_Master_Log_File: mysql-bin.000160
             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: 35117
              Relay_Log_Space: 154
              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: 2003
                Last_IO_Error: 
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 0
                  Master_UUID: c8d666a2-ff5e-11e7-9e40-eebc113755c2
             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: 180417 11:54:56
     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)
ERROR:
No query specified

Step#07: Replication test create table and then goto slave server.

Goto master server mysql terminal

mysql> use test_db;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed

mysql> create table test (c int);
Query OK, 0 rows affected (0.60 sec)

mysql> show tables;
+----------------------+
| Tables_in_test |
+----------------------+
test
+----------------------+
1 rows in set (0.00 sec)

Now goto slave server mysql terminal

mysql> use test_db;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> show tables;
+----------------------+
| Tables_in_test |
+----------------------+
test
+----------------------+
1 rows in set (0.00 sec)

If any problem so please see my YouTube channel for more information. Please share this tutorial any social media.

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