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Ansible role: MariaDB

Install and configure MariaDB Server on Debian/Ubuntu.

Optionally, this role also permits one to:

deploy a master/replica cluster;
setup backups and rotation of the dumps.

Requirements

The role uses mysql_user and mysql_db ansible modules that depend on PyMySQL so Python 2.7 or Python 3.X versions are needed.

For older Python versions, you may use MySQLdb but then the role may not be idempotent (not tested).

Fact gathering (performance)

Unless you want to use the MariaDB official repository (and then need ansible_distribution_version, see tasks/setup.yml) this role does not require fact gathering.

Role variables

Available variables are listed below, along with default values (see defaults/main.yml).

MariaDB version

mariadb_use_official_repo: false
mariadb_use_official_repo_url: http://ftp.igh.cnrs.fr/pub/mariadb/repo
mariadb_use_official_repo_version: 10.5

You may deploy the MariaDB Server version that comes with your distribution (Debian/Ubuntu) or deploy the version packaged by the MariaDB Foundation. You can use the MariaDB Foundation repository configuration tool: https://mariadb.org/download/#mariadb-repositories

By default, we deploy the MariaDB Server version that comes with the distribution.

MariaDB service activation and restart

mariadb_enabled_on_startup: true
mariadb_can_restart: true

Warning: you may consider setting mariadb_can_restart to false on production systems to prevent ansible runs from restarting the MariaDB Server.

General configuration

To populate the MariaDB Server configuration file, we use almost only raw variables. This permits more flexibility and a very simple templates/mariadb.cnf.j2 file.

By default, some common and standard options are deployed based on the MariaDB Foundation package and it should be easy to change them all (see mariadb.cnf).

Basic settings

mariadb_config_file: /etc/mysql/mariadb.cnf
mariadb_datadir: /var/lib/mysql
mariadb_port: 3306
mariadb_bind_address: 127.0.0.1
mariadb_unix_socket: /run/mysqld/mysqld.sock

mariadb_basic_settings_raw: |
  user                  = mysql
  pid-file              = /run/mysqld/mysqld.pid
  socket                = {{ mariadb_unix_socket }}
  basedir               = /usr
  datadir               = {{ mariadb_datadir }}
  tmpdir                = /tmp
  lc-messages-dir       = /usr/share/mysql
  lc_messages           = en_US
  skip-external-locking
  port                  = {{ mariadb_port }}
  bind-address          = {{ mariadb_bind_address }}

Fine tuning

mariadb_fine_tuning_raw: |
  max_connections         = 100
  connect_timeout         = 5
  wait_timeout            = 600
  max_allowed_packet      = 16M
  thread_cache_size       = 128
  sort_buffer_size        = 4M
  bulk_insert_buffer_size = 16M
  tmp_table_size          = 32M
  max_heap_table_size     = 32M

Query cache

mariadb_query_cache_raw: |
  query_cache_size        = 16M

Logging

mariadb_logging_raw: |
  log_error = /var/log/mysql/error.log

Character sets

mariadb_character_sets_raw: |
  character-set-server = utf8mb4
  collation-server     = utf8mb4_general_ci

InnoDB

mariadb_innodb_raw: |
  # InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
  # Read the manual for more InnoDB related options. There are many!

Mariadbdump

mariadb_mysqldump_raw: |
  quick
  quote-names
  max_allowed_packet = 16M

Database management

mariadb_databases: []
#   - name: db1
#     collation: utf8_general_ci
#     encoding: utf8
#     replicate: true|false

See: https://docs.ansible.com/ansible/latest/modules/mysql_db_module.html

User management

mariadb_users: []
#   - name: user
#     host: 100.64.200.10
#     password: password
#     priv: "*.*:USAGE/db1.*:ALL"
#     state: present|absent

See: https://docs.ansible.com/ansible/latest/modules/mysql_user_module.html

Replication (optional)

Replication is only enabled if mariadb_replication_role has a value (master or replica).

The replication setup on the replica use the GTID autopositioning master_use_gtid=slave_pos. See: https://mariadb.com/kb/en/library/change-master-to/#master_use_gtid

For the moment, we use an SQL command but in ansible 2.10, we should be able to use the mysql_replication module (see tasks/replication_replica.yml and https://github.com/ansible/ansible/pull/62648).

Common vars

# Same keys as `mariadb_users` above.
# priv is set to "*.*:REPLICATION SLAVE" by default
mariadb_replication_user: []

Master variables

mariadb_replication_role: master
mariadb_server_id: 1
mariadb_max_binlog_size: 100M
mariadb_binlog_format: MIXED
mariadb_expire_logs_days: 10

Replica variables

mariadb_replication_role: replica
mariadb_server_id: 1
mariadb_replication_master_ip: IP

Backups (optional)

# db dumps backup
mariadb_backup_db: false
mariadb_backup_db_cron_min: 50
mariadb_backup_db_cron_hour: 00
mariadb_backup_db_dir: /mnt/backup
mariadb_backup_db_rotation: 15
# set to "1>" to get only STDERR on cron
mariadb_backup_cron_std_output: "2>&1 | tee"

# name of the database to dump
# (mandatory if mariadb_backup_db is set to true)
mariadb_backup_db_name: []
#   - db1
#   - db2

Database dumps are done serially and the compression step (gzip) is done after to avoid lengthy locks.

Example playbook

- hosts: db
  roles:
    - fauust.mariadb

Lincense

GNU General Public License v3.0

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