play & role for mysql server

roles/mysql/defaults/main.yml

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+---
+# ---------------------------------------------------------------------------
+mysql_root_password: "{{ lookup('env', 'MYSQL_ROOT_PASSWORD') | default('', true) }}"
+mysql_replication_user: "repl"
+mysql_replication_password: "{{ lookup('env', 'MYSQL_REPL_PASSWORD') | default('', true) }}"
+mysql_app_user: "{{ lookup('env', 'MYSQL_APP_USER') | default('appuser', true) }}"
+mysql_app_password: "{{ lookup('env', 'MYSQL_APP_PASSWORD') | default('', true) }}"
+mysql_app_database: "{{ lookup('env', 'MYSQL_APP_DATABASE') | default('appdb', true) }}"
+
+mysql_version: "{{ lookup('env', 'MYSQL_VERSION') | default('8.0', true) }}"
+mysql_server_id: "{{ lookup('env', 'HOSTNAME') | default('mysql', true) }}"
+
+# --- Sizing ------------------------------------------------------------
+# Set per-environment (override in host_vars if primary/replicas differ in size).
+# Rule of thumb: innodb_buffer_pool_size ~= 70-75% of RAM on a dedicated DB host.
+mysql_total_ram_mb: "{{ lookup('env', 'MYSQL_TOTAL_RAM_MB') | default(8192, true) | int }}"
+mysql_innodb_buffer_pool_size: "{{ (mysql_total_ram_mb | int * 0.70) | round | int }}M"
+
+mysql_max_connections: 200
+
+# --- Networking / security ----------------------------------------------
+mysql_bind_address: "0.0.0.0"     # bound to all interfaces; ufw restricts who can reach it
+mysql_port: 3306
+mysql_allowed_cidrs:              # who is allowed to hit port 3306 via firewall
+  - "{{ lookup('env', 'MYSQL_ALLOWED_CIDR') | default('10.0.1.0/24', true) }}"
+
+# --- Replication ----------------------------------------------------------
+mysql_gtid_mode: "ON"
+mysql_binlog_format: "ROW"
+mysql_binlog_expire_logs_seconds: 604800   # 7 days
+
+# --- Backups ---------------------------------------------------------------
+mysql_backup_enabled: "{{ lookup('env', 'MYSQL_BACKUP_ENABLED') | default('true', true) | bool }}"
+mysql_backup_dir: /var/backups/mysql
+mysql_backup_retention_days: 7
+mysql_backup_hour: 2    # 2am local, staggered per-host below if needed

roles/mysql/handlers/main.yml

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+---
+- name: restart mysql
+  systemd:
+    name: mysql
+    state: restarted
+

roles/mysql/tasks/main.yml

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+---
+- name: Install prerequisite packages
+  apt:
+    name:
+      - gnupg2
+      - lsb-release
+      - python3-pymysql   # required by Ansible's community.mysql modules
+      - ufw
+    state: present
+    update_cache: true
+
+- name: Install MySQL server
+  apt:
+    name:
+      - mysql-server-8.0
+      - mysql-client-8.0
+    state: present
+  notify: restart mysql
+
+- name: Ensure MySQL data/log directories exist with correct ownership
+  file:
+    path: "{{ item }}"
+    state: directory
+    owner: mysql
+    group: mysql
+    mode: '0750'
+  loop:
+    - /var/log/mysql
+    - "{{ mysql_backup_dir }}"
+
+- name: Deploy tuned my.cnf
+  template:
+    src: my.cnf.j2
+    dest: /etc/mysql/mysql.conf.d/99-production.cnf
+    owner: root
+    group: root
+    mode: '0644'
+    # validate: 'mysqld --defaults-file=%s --validate-config'
+  notify: restart mysql
+
+- name: Start and enable MySQL
+  systemd:
+    name: mysql
+    state: started
+    enabled: true
+
+- name: Set MySQL root password (idempotent — only runs if not already set)
+  community.mysql.mysql_user:
+    name: root
+    password: "{{ mysql_root_password }}"
+    host: localhost
+    login_unix_socket: /var/run/mysqld/mysqld.sock
+    state: present
+  no_log: true
+
+- name: Create .my.cnf for root so future plays authenticate automatically
+  template:
+    src: root_my_cnf.j2
+    dest: /root/.my.cnf
+    owner: root
+    group: root
+    mode: '0600'
+  no_log: true
+
+# --- mysql_secure_installation equivalent, done idempotently ---------------
+- name: Remove anonymous MySQL users
+  community.mysql.mysql_user:
+    name: ''
+    host_all: true
+    state: absent
+    login_unix_socket: /var/run/mysqld/mysqld.sock
+
+- name: Remove test database
+  community.mysql.mysql_db:
+    name: test
+    state: absent
+    login_unix_socket: /var/run/mysqld/mysqld.sock
+
+- name: Disallow remote root login
+  community.mysql.mysql_user:
+    name: root
+    host: "{{ item }}"
+    state: absent
+    login_unix_socket: /var/run/mysqld/mysqld.sock
+  loop:
+    - "{{ ansible_hostname }}"
+    - "%"
+  ignore_errors: true   # fine if they don't exist
+
+# --- Firewall: only allow MySQL port from known CIDRs ----------------------
+- name: Allow MySQL port from trusted CIDRs only
+  community.general.ufw:
+    rule: allow
+    port: "{{ mysql_port | string }}"
+    proto: tcp
+    from_ip: "{{ item }}"
+  loop: "{{ mysql_allowed_cidrs }}"
+
+- name: Reload ufw
+  community.general.ufw:
+    state: enabled
+
+# --- Application DB + user --------------------------------------------------
+- name: Create retailor database
+  community.mysql.mysql_db:
+    name: "{{ mysql_app_database }}"
+    state: present
+    login_unix_socket: /var/run/mysqld/mysqld.sock
+
+- name: Create forge user
+  community.mysql.mysql_user:
+    name: "{{ mysql_app_user }}"
+    password: "{{ mysql_app_password }}"
+    priv: "{{ mysql_app_database }}.*:ALL"
+    host: '%'
+    state: present
+    login_unix_socket: /var/run/mysqld/mysqld.sock
+  no_log: true
+
+- name: Create replication user
+  community.mysql.mysql_user:
+    name: "{{ mysql_replication_user }}"
+    password: "{{ mysql_replication_password }}"
+    priv: "*.*:REPLICATION SLAVE"
+    host: '%'
+    state: present
+    login_unix_socket: /var/run/mysqld/mysqld.sock
+  no_log: true
+
+- name: Deploy logrotate config
+  template:
+    src: logrotate_mysql.j2
+    dest: /etc/logrotate.d/mysql-server
+    owner: root
+    group: root
+    mode: '0644'
+
+- name: Deploy backup script
+  template:
+    src: mysql_backup.sh.j2
+    dest: /usr/local/bin/mysql_backup.sh
+    owner: root
+    group: root
+    mode: '0750'
+  when: mysql_backup_enabled
+
+- name: Schedule nightly backup cron
+  cron:
+    name: "mysql nightly backup"
+    hour: "{{ mysql_backup_hour }}"
+    minute: "0"
+    job: "/usr/local/bin/mysql_backup.sh >> /var/log/mysql/backup.log 2>&1"
+    user: root
+  when: mysql_backup_enabled
+

roles/mysql/templates/logrotate_mysql.j2

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+/var/log/mysql/*.log {
+    daily
+    rotate 14
+    missingok
+    compress
+    delaycompress
+    notifempty
+    create 640 mysql adm
+    sharedscripts
+    postrotate
+        /usr/bin/mysqladmin flush-logs
+    endscript
+}
+

roles/mysql/templates/my.cnf.j2

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+# Production MySQL config — generated by Ansible for retailor.io. Edit by hand might cause drift!
+
+[mysqld]
+bind-address            = {{ mysql_bind_address }}
+port                     = {{ mysql_port }}
+max_connections          = {{ mysql_max_connections }}
+server_id                = {{ mysql_server_id }}
+
+# --- InnoDB ------------------------------------------------------------
+innodb_buffer_pool_size  = {{ mysql_innodb_buffer_pool_size }}
+innodb_log_file_size     = 512M
+innodb_flush_log_at_trx_commit = 1        # full ACID durability; set to 2 only if you accept losing ~1s of txns on crash
+innodb_flush_method      = O_DIRECT
+innodb_file_per_table    = 1
+
+# --- Replication (GTID-based) -------------------------------------------
+gtid_mode                = {{ mysql_gtid_mode }}
+enforce_gtid_consistency = ON
+log_bin                  = /var/log/mysql/mysql-bin.log
+binlog_format             = {{ mysql_binlog_format }}
+binlog_expire_logs_seconds = {{ mysql_binlog_expire_logs_seconds }}
+sync_binlog               = 1
+read_only                 = {{ 'ON' if 'mysql_replica' in group_names else 'OFF' }}
+relay_log                 = /var/log/mysql/mysql-relay-bin
+
+# --- Logging -------------------------------------------------------------
+slow_query_log            = 1
+slow_query_log_file       = /var/log/mysql/mysql-slow.log
+long_query_time            = 2
+log_error                 = /var/log/mysql/error.log
+
+# --- Security --------------------------------------------------------------
+local_infile               = 0
+skip_name_resolve          = 1
+

roles/mysql/templates/root_my_cnf.j2

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+[client]
+user = root
+password = "{{ mysql_root_password }}"
+