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infrastructure/databases/mysql/SKILL.md

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+---
+name: mysql
+description: Administer MySQL/MariaDB databases. Configure replication and optimize performance. Use when managing MySQL deployments.
+license: MIT
+metadata:
+  author: devops-skills
+  version: "1.0"
+---
+
+# MySQL / MariaDB
+
+Administer MySQL and MariaDB databases.
+
+## Installation & Setup
+
+```bash
+# Install
+apt install mysql-server
+
+# Secure installation
+mysql_secure_installation
+
+# Access
+mysql -u root -p
+
+# Create database and user
+CREATE DATABASE mydb;
+CREATE USER 'myapp'@'%' IDENTIFIED BY 'secret';
+GRANT ALL PRIVILEGES ON mydb.* TO 'myapp'@'%';
+FLUSH PRIVILEGES;
+```
+
+## Configuration
+
+```bash
+# /etc/mysql/mysql.conf.d/mysqld.cnf
+[mysqld]
+innodb_buffer_pool_size = 1G
+max_connections = 200
+slow_query_log = 1
+long_query_time = 2
+```
+
+## Backup & Restore
+
+```bash
+# Backup
+mysqldump -u root -p mydb > backup.sql
+mysqldump -u root -p --all-databases > full_backup.sql
+
+# Restore
+mysql -u root -p mydb < backup.sql
+```
+
+## Replication
+
+```bash
+# Primary
+[mysqld]
+server-id = 1
+log_bin = mysql-bin
+
+# Replica
+CHANGE MASTER TO
+  MASTER_HOST='primary',
+  MASTER_USER='replicator',
+  MASTER_PASSWORD='secret',
+  MASTER_LOG_FILE='mysql-bin.000001',
+  MASTER_LOG_POS=0;
+START SLAVE;
+```
+
+## Best Practices
+
+- Enable slow query logging
+- Use InnoDB storage engine
+- Regular backups with mysqldump
+- Monitor with SHOW PROCESSLIST