77 lines
2.9 KiB
Markdown
77 lines
2.9 KiB
Markdown
# Database MySQL
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## Note
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We do not recommend using MySQL due to various issues. For example, case [(in)sensitivity](https://dev.mysql.com/doc/refman/5.0/en/case-sensitivity.html) and [problems](https://bugs.mysql.com/bug.php?id=65830) that [suggested](https://bugs.mysql.com/bug.php?id=50909) [fixes](https://bugs.mysql.com/bug.php?id=65830) [have](https://bugs.mysql.com/bug.php?id=63164).
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## MySQL
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# Install the database packages
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sudo apt-get install -y mysql-server mysql-client libmysqlclient-dev
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# Ensure you have MySQL version 5.5.14 or later
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mysql --version
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# Pick a MySQL root password (can be anything), type it and press enter
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# Retype the MySQL root password and press enter
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# Secure your installation
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sudo mysql_secure_installation
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# Login to MySQL
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mysql -u root -p
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# Type the MySQL root password
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# Create a user for GitLab
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# do not type the 'mysql>', this is part of the prompt
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# change $password in the command below to a real password you pick
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mysql> CREATE USER 'git'@'localhost' IDENTIFIED BY '$password';
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# Ensure you can use the InnoDB engine which is necessary to support long indexes
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# If this fails, check your MySQL config files (e.g. `/etc/mysql/*.cnf`, `/etc/mysql/conf.d/*`) for the setting "innodb = off"
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mysql> SET storage_engine=INNODB;
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# Create the GitLab production database
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mysql> CREATE DATABASE IF NOT EXISTS `gitlabhq_production` DEFAULT CHARACTER SET `utf8` COLLATE `utf8_unicode_ci`;
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# Grant the GitLab user necessary permissions on the database
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mysql> GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, CREATE TEMPORARY TABLES, DROP, INDEX, ALTER, LOCK TABLES, REFERENCES ON `gitlabhq_production`.* TO 'git'@'localhost';
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# Quit the database session
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mysql> \q
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# Try connecting to the new database with the new user
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sudo -u git -H mysql -u git -p -D gitlabhq_production
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# Type the password you replaced $password with earlier
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# You should now see a 'mysql>' prompt
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# Quit the database session
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mysql> \q
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# You are done installing the database and can go back to the rest of the installation.
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## MySQL strings limits
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After installation or upgrade, remember to run the `add_limits_mysql` Rake task:
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```
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bundle exec rake add_limits_mysql
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```
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The `text` type in MySQL has a different size limit than the `text` type in
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PostgreSQL. In MySQL `text` columns are limited to ~65kB, whereas in PostgreSQL
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`text` columns are limited up to ~1GB!
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The `add_limits_mysql` Rake task converts some important `text` columns in the
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GitLab database to `longtext` columns, which can persist values of up to 4GB
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(sometimes less if the value contains multibyte characters).
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Details can be found in the [PostgreSQL][postgres-text-type] and
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[MySQL][mysql-text-types] manuals.
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[postgres-text-type]: http://www.postgresql.org/docs/9.1/static/datatype-character.html
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[mysql-text-types]: http://dev.mysql.com/doc/refman/5.7/en/string-type-overview.html
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