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Table of Contents

Install MariaDB on

...

replica server

Install the same MariaDB server package that Abiquo API server is using on the slave replica server. This can be achieve by installing the corresponding

  1. On the replica server, Install your abiquo-release package

...

  2. Install MariaDB with this command

    Code Block
    yum -y install MariaDB-server MariaDB-client

...

Configure DB replication on

...

the main DB server

...

  1. On the main DB server, create the replication configuration file

...

  1. Code Block
    cat <<EOF >/etc/my.cnf.d/replication.cnf
[server]
log-basename=master
log-bin
binlog-format=row
server_id=1
EOF

  2. Restart the mysql service

...

  1. Code Block
    service mysql restart

  2. Create a replicator user and grant it replication permissions by executing the query below on DB prompt. Replace REPLICA_USER, REPLICA_PASS, and

...

  1. REPLICA_SERVER

...

  1. with values for your environment.

    Code Block
    grant replication slave on *.* to 'REPLICA_USER'@'SLAVE_SERVER' identified by 'REPLICA_PASS';
flush privileges;

...

Configure DB replication on

...

replica DB server

  1. Create the replication configuration file in Maria DB

...

  1. replica server

...

  1. .

    Code Block
    cat <<EOF >/etc/my.cnf.d/replication.cnf
[server]
server_id=2
EOF

  2. Restart the mysql service

...

  1. .

    Code Block
    service mysql restart
Warning

Remember that, if you are using multiple slaves, each one must has a different server_id defined To use multiple replica servers, in /etc/my.cnf.d/replication.cnf for each replica server, you must define a different server_id, and it must be greater than the server_id of the mastermain server.

 

...

Perform initial replication

To perform the initial replication, get the current status of the main DB, including the file and the current position in the log, and then perform a dump of the database with the following steps

  1. Open a new session on

...

  1. the main DB server

...

  1. at the

...

  1. mysql prompt

  2. Run the following commands to get the file and current position

    Code Block
    flush tables with read lock;
show master status;
+----------------------+----------+--------------+------------------+
| File                 | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+----------------------+----------+--------------+------------------+
| master-bin.000001    |  3712878 |              |                  |
+----------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

...

  1. Leave this session open and don’t make any changes until replication is completed.

  2. On the MariaDB main server, open another session and dump the kinton and kinton_accounting databases

...

  1. using --single-transaction option

    Code Block
    mysqldump --databases kinton kinton_accounting --routines  --single-transaction > dump.sql

...

Configure slave replication point

  1. Copy dump.sql from the previous step from

...

  1. the main DB server to

...

  1. the replica DB server.

...

  2. When the copy finishes, import it into

...

  1. replica DB server. If this is a new installation you may need to create the kinton

...

  1. databases.

    Code Block
    mysql < dump.sql

...

  1. When the import finishes, configure

...

  1. replica DB server replication.

...

  1. On the replica DB server, go to the mysql prompt and run the change master command below

    1. Replace MAIN_SERVER, REPLICA_USER

...

    1. and REPLICA_PASS

...

    1. .

    2. Replace MASTER_LOG_FILE and MASTER_LOG_POS

...

    1. from the show master status above

      Code Block
      change master to
  MASTER_HOST='

...

    1. MAIN_SERVER',
  MASTER_USER='REPLICA_USER',
  MASTER_PASSWORD='REPLICA_PASS',
  MASTER_PORT=3306,
  MASTER_LOG_FILE='MASTER_LOG_FILE',
  MASTER_LOG_POS=MASTER_LOG_POS,
  MASTER_CONNECT_RETRY=10;

      For example, using the values from above of  master-bin.000001 and  3712878

      Code Block
      change master to
  MASTER_HOST='services.lab.example.com',
  MASTER_USER='abiquodb',
  MASTER_PASSWORD='abiquodbpassword',
  MASTER_PORT=3306,
  MASTER_LOG_FILE='master-bin.000001',
  MASTER_LOG_POS=3712878,
  MASTER_CONNECT_RETRY=10;

...

  1. On the replica server, at the mysql prompt, start replica DB replication

    Code Block
    start slave;

...

  2. To check replication status

...

  1. , run the following command on the

...

  1. replica DB

    Code Block
    show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
...
1 row in set (0.00 sec)

...

  1. When Slave_IO_State is

...

  1. Waiting for master to send event

...

  1. , replication is finished

...

  2. Release locks by closing the first session on master DB server where locks were set and the master status was requested

...

  1. , and you are done

...

  1. !


References

https://mariadb.com/kb/en/setting-up-replication/