====== Information ======

  * MariaDB ((https://mariadb.org/about))
  * [[Information:Realm of Espionage]]

===== Prerequisites =====

  * [[linux;distros;server;fedora_server|Fedora Server]]
  * [[linux;distros;fedora_workstation_gnome|Fedora Workstation]] ((for ''localhost'' game servers))

===== Resources =====

  * https://mariadb.com/kb/en/configuring-mariadb-with-option-files/
  * https://mariadb.com/kb/en/legacy-clients-and-utilities/

====== Settings ======

  * Settings being done before installation is intentional

  sudo mkdir -p '/etc/my.cnf.d' && sudo -e '/etc/my.cnf.d/custom.cnf'

<code>
[client]
default-character-set = 'utf8mb4'

[mariadb-client]
default-character-set = 'utf8mb4'

[mariadbd]
character-set-client-handshake = 'FALSE'
character-set-server = 'utf8mb4'
collation-server = 'utf8mb4_unicode_ci'
init-connect='SET NAMES utf8mb4'
expire_logs_days = '7'
max_binlog_size = '100M'
skip-networking = 'On'
table_definition_cache = '1400'</code>

==== Verify =====

****

  sudo mariadb-admin variables | egrep 'utf8|networking|socket'

====== Dependencies ======

****

  sudo dnf install 'mariadb-server'

====== Initial Setup ======

****

  sudo systemctl enable 'mariadb' --now && sudo mariadb-secure-installation

====== Database Repair and Optimization ======

===== One-shot =====

****

  sudo mariadb-check --optimize --all-databases --force --extended --auto-repair

===== Create MySQL User =====

  sudo mariadb

  CREATE USER 'maintenance'@'localhost' IDENTIFIED BY 'x';

  GRANT SELECT, INSERT ON *.* to 'maintenance'@'localhost';

  FLUSH PRIVILEGES;

  EXIT

===== Authentication File =====

  sudo mkdir -p '/var/lib/mysql/auth' && sudo -e '/var/lib/mysql/auth/maintenance' && sudo chown -v -R 'mysql':'mysql' '/var/lib/mysql/auth' && sudo chmod -v '600' '/var/lib/mysql/auth/maintenance' && sync

<code>
[mariadb-check]
user=maintenance
password=x</code>

===== Service =====

  sudo -e '/etc/systemd/system/db-m.service'

<code>
[Service]
User=mysql
Group=mysql
Type=oneshot
ExecStart='/usr/bin/mariadb-check' --defaults-extra-file='/var/lib/mysql/auth/maintenance' --optimize --all-databases --force --extended --auto-repair
ExecStartPost='/usr/bin/sync'</code>

===== Timer =====

  sudo -e '/etc/systemd/system/db-m.timer' && sudo systemctl daemon-reload && sudo systemctl enable 'db-m.timer' --now && sudo systemctl start 'db-m' && sudo systemctl status 'db-m' -l

<code>
[Unit]
Description=MariaDB Database Check, Repair, and Optimization
After=mariadb.service

[Timer]
OnCalendar=weekly
Persistent=true

[Install]
WantedBy=timers.target</code>

====== Notable Commands ======

===== Show Users on Server =====

****

  select User,Host from mysql.user;

===== Socket File =====

****

  /var/lib/mysql/mysql.sock