Introduction
A database is a collection of data that is organized in a way that allows for efficient storage, retrieval, and manipulation of that data
A DBMS is a software system that enables users to create, maintain, and manipulate databases
I will be configuring MariaDB on Linux System
💡 MariaDB is a popular open-source relational DBMS that was forked from MySQL in 2009, after concerns arose about MySQL's acquisition by Oracle Corporation
Installing and setting up MariaDB
We will use the yum command to install MariaDB
yum -y install mariadb-*
# Confirming
rpm -qa | grep mariadb
mariadb-embedded-5.5.68-1.el7.x86_64
mariadb-bench-5.5.68-1.el7.x86_64
mariadb-libs-5.5.68-1.el7.x86_64
mariadb-server-5.5.68-1.el7.x86_64
mariadb-embedded-devel-5.5.68-1.el7.x86_64
mariadb-test-5.5.68-1.el7.x86_64
mariadb-5.5.68-1.el7.x86_64
mariadb-devel-5.5.68-1.el7.x86_64
Starting the service
systemctl start mariadb
systemctl enable mariadb
There is a security script included in MariaDB. We can start that using
mysql_secure_installation
This will ask for the root password. It is asking for the DBMS root user, not the Linux's root user
After setting the password, there will be some steps that the security script will ask and we need to select between 'Y' and 'n'
We can 'Y' the following queries:
- Set root password
- Remove Anonymous user
- Disallow remote root login
- Remove test database
- Reload privilege tables
👉 Removing the anonymous user and removing test database steps are used mainly for moving into the production environment
Upon completion, the script should say
All done! If you've completed all of the above steps, your MariaDB
installation should now be secure.
Thanks for using MariaDB!
After this, we will check the .cnf file
vi /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
[mysqld_safe]
log-error=/var/log/mariadb/mariadb.log
pid-file=/var/run/mariadb/mariadb.pid
👉 I needed the utf8 encoding because I use Korean data so I added
character-set-server=utf8
Starting a session with MariaDB
We will use the following command to enter the MariaDB server
mysql -u root -p -h localhost mysql
Here,
- mysql: This is the command to start the MariaDB client
- -u root: This specifies the username to use when connecting to the MariaDB server
- -p: This option tells MariaDB to prompt for a password before allowing the user to connect
- -h localhost: This specifies the host name or IP address of the MariaDB server to connect to
- mysql: This is the name of the database to use. The default database called "mysql" was created by MariaDB when it was first installed
If we see tables inside this database:
MariaDB [mysql]> show tables;
+---------------------------+
| Tables_in_mysql |
+---------------------------+
| columns_priv |
| db |
| event |
| func |
| general_log |
| help_category |
| help_keyword |
| help_relation |
| help_topic |
| host |
| ndb_binlog_index |
| plugin |
| proc |
| procs_priv |
| proxies_priv |
| servers |
| slow_log |
| tables_priv |
| time_zone |
| time_zone_leap_second |
| time_zone_name |
| time_zone_transition |
| time_zone_transition_type |
| user |
+---------------------------+
💡 We can see that the default database
mysqlcontains important information and some log files too. We can also see 'user' table that contains the user information of MariaDB server
MariaDB [mysql]> desc mysql.user;
+------------------------+-----------------------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+------------------------+-----------------------------------+------+-----+---------+-------+
| Host | char(60) | NO | PRI | | |
| User | char(16) | NO | PRI | | |
| Password | char(41) | NO | | | |
| Select_priv | enum('N','Y') | NO | | N | |
| Insert_priv | enum('N','Y') | NO | | N | |
| Update_priv | enum('N','Y') | NO | | N | |
| Delete_priv | enum('N','Y') | NO | | N | |
Conclusion
✨ We installed and connected to the MariaDB server created inside the local host of the Linux system. There are many SQL statements, functions, and utilities. I recommend going through the official MariaDB documentation to learn more about MariaDB 😀
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