Transferring or Migrating a MySQL/MariaDB database between servers usually takes only few easy steps, but data transfer can take some time depending on the volume of data you would like to transfer.
In this article, you will learn how to transfer or migrate all your MySQL/MariaDB databases from old Linux server to a new server, import it successfully and confirm that the data is there.
- Make sure to have the same version of MySQL installed on both server with same distribution.
- Make sure to have enough free space on both server to hold the database dump file and the imported database.
- Don’t ever consider moving the
data directory of database to another server. Never mess with internal structure of the database, if you do, you will face problems in future.
Export a MySQL Databases to Dump File
First start by login into your old server and stop the mysql/mariadb service using the systemctl command as shown.
# systemctl stop mariadb
# systemctl stop mysql
Then dump all your MySQL databases to a single file using the mysqldump command.
# mysqldump -u [user] -p –all-databases > all_databases.sql
Once the dump is completed, you are ready to transfer the databases.
If you want to dump a single database, you can use:
# mysqldump -u root -p --opt [database name] > database_name.sql
Transfer MySQL Databases Dump File to New Server
Now use scp command to transfer your databases dump file to the new server under home directory as shown.
# scp all_databases.sql email@example.com:~/ [All Databases]
# scp database_name.sql firstname.lastname@example.org:~/ [Singe Database]
Once you connect, the database will be transferred to the new server.
Import MySQL Databases Dump File to New Server
Once the MySQL dump file has been traferred to the new server, you can use the following command to import all your databases into MySQL.
# mysql -u [user] -p –all-databases < all_databases.sql [All Databases]
# mysql -u [user] -p newdatabase < database_name.sql [Singe Database]
Once the import is completed, you can verify the databases on both servers using the following command on the mysql shell.
# mysql -u user -p
# show databases;
Transfer MySQL Databases and Users to New Server
If you want to move all your MySQL databases, users, permissions and data structure old server to new, you can use rsync command to copy the all the content from the mysql/mariadb data directory to new server as shown.
# rsync -avz /var/lib/mysql/* email@example.com:/var/lib/mysql/
Once the transfer completes, you can set the ownership of the mysql/mariadb data directory to user and group mysql, then do a directory listing to check that all files have been transferred.
# chown mysql:mysql -R /var/lib/mysql/
# ls -l /var/lib/mysql/
That’s all! In this article, you learned how to easily migrate all MySQL/MariaDB databases from one server to another.
Source : Tecmint