roles/mariadb: Manage /etc/mysql/my.cnf

Set some sane defaults and manage the config file with a template.

roles/mariadb/defaults/main.yml

@@ -0,0 +1,25 @@
+---
+# file: roles/mariadb/defaults/main.yml
+#
+# Based on my running of mysqltuner.pl on a host with three WordPress databases
+# and a Piwik instance monitoring three sites.
+#
+
+# default is 128MB but is a waste because it seems only the mysql table uses it
+key_buffer_size: 32M
+
+# default is 128MB but is a waste because it seems only information_schema uses
+# AriaDB, see: https://mariadb.com/kb/en/mariadb/aria-system-variables
+aria_pagecache_buffer_size: 8M
+
+# default is 128M, but set to at least the size of your InnoDB data
+innodb_buffer_pool_size: 256M
+
+# Unless you have a pool size over 1GB, use a single instance
+# See: https://mariadb.com/kb/en/mariadb/xtradbinnodb-server-system-variables
+innodb_buffer_pool_instances: 1
+
+# default is 100 but the max I've seen used is 5, so let's reduce it
+max_connections: 33
+
+# vim: set ts=2 sw=2:

roles/mariadb/handlers/main.yml

@@ -0,0 +1,5 @@
+---
+- name: restart mysql
+  service: name=mysql state=restarted
+
+# vim: set ts=2 sw=2:

roles/mariadb/tasks/main.yml

@@ -14,6 +14,12 @@
     - python-mysqldb # for ansible
   tags: mariadb
 
+- name: Create system my.cnf
+  template: src=my.cnf.j2 dest=/etc/mysql/my.cnf owner=root group=root mode=0644
+  notify:
+    - restart mysql
+  tags: mariadb
+
 - name: Start and enable MariaDB Service
   service: name=mysql state=started enabled=true
   tags: mariadb

roles/mariadb/templates/my.cnf.j2

@@ -0,0 +1,192 @@
+# MariaDB database server configuration file.
+#
+# You can copy this file to one of:
+# - "/etc/mysql/my.cnf" to set global options,
+# - "~/.my.cnf" to set user-specific options.
+# 
+# One can use all long options that the program supports.
+# Run program with --help to get a list of available options and with
+# --print-defaults to see which it would actually understand and use.
+#
+# For explanations see
+# http://dev.mysql.com/doc/mysql/en/server-system-variables.html
+
+# This will be passed to all mysql clients
+# It has been reported that passwords should be enclosed with ticks/quotes
+# escpecially if they contain "#" chars...
+# Remember to edit /etc/mysql/debian.cnf when changing the socket location.
+[client]
+port		= 3306
+socket		= /var/run/mysqld/mysqld.sock
+
+# Here is entries for some specific programs
+# The following values assume you have at least 32M ram
+
+# This was formally known as [safe_mysqld]. Both versions are currently parsed.
+[mysqld_safe]
+socket		= /var/run/mysqld/mysqld.sock
+nice		= 0
+
+[mysqld]
+#
+# * Basic Settings
+#
+user		= mysql
+pid-file	= /var/run/mysqld/mysqld.pid
+socket		= /var/run/mysqld/mysqld.sock
+port		= 3306
+basedir		= /usr
+datadir		= /var/lib/mysql
+tmpdir		= /tmp
+lc_messages_dir	= /usr/share/mysql
+lc_messages	= en_US
+skip-external-locking
+#
+# Instead of skip-networking the default is now to listen only on
+# localhost which is more compatible and is not less secure.
+bind-address		= 127.0.0.1
+#
+# * Fine Tuning
+#
+max_connections		= {{ max_connections }}
+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
+#
+# * MyISAM
+#
+# This replaces the startup script and checks MyISAM tables if needed
+# the first time they are touched. On error, make copy and try a repair.
+myisam_recover_options = BACKUP
+key_buffer_size		= {{ key_buffer_size }}
+#open-files-limit	= 2000
+table_open_cache	= 400
+myisam_sort_buffer_size	= 512M
+concurrent_insert	= 2
+read_buffer_size	= 2M
+read_rnd_buffer_size	= 1M
+#
+# * Query Cache Configuration
+#
+# Cache only tiny result sets, so we can fit more in the query cache.
+query_cache_limit		= 128K
+query_cache_size		= 64M
+# for more write intensive setups, set to DEMAND or OFF
+#query_cache_type		= DEMAND
+#
+# * Logging and Replication
+#
+# Both location gets rotated by the cronjob.
+# Be aware that this log type is a performance killer.
+# As of 5.1 you can enable the log at runtime!
+#general_log_file        = /var/log/mysql/mysql.log
+#general_log             = 1
+#
+# Error logging goes to syslog due to /etc/mysql/conf.d/mysqld_safe_syslog.cnf.
+#
+# we do want to know about network errors and such
+log_warnings		= 2
+#
+# Enable the slow query log to see queries with especially long duration
+#slow_query_log[={0|1}]
+slow_query_log_file	= /var/log/mysql/mariadb-slow.log
+long_query_time = 10
+#log_slow_rate_limit	= 1000
+log_slow_verbosity	= query_plan
+
+#log-queries-not-using-indexes
+#log_slow_admin_statements
+#
+# The following can be used as easy to replay backup logs or for replication.
+# note: if you are setting up a replication slave, see README.Debian about
+#       other settings you may need to change.
+#server-id		= 1
+#report_host		= master1
+#auto_increment_increment = 2
+#auto_increment_offset	= 1
+log_bin			= /var/log/mysql/mariadb-bin
+log_bin_index		= /var/log/mysql/mariadb-bin.index
+# not fab for performance, but safer
+#sync_binlog		= 1
+expire_logs_days	= 10
+max_binlog_size         = 100M
+# slaves
+#relay_log		= /var/log/mysql/relay-bin
+#relay_log_index	= /var/log/mysql/relay-bin.index
+#relay_log_info_file	= /var/log/mysql/relay-bin.info
+#log_slave_updates
+#read_only
+#
+# If applications support it, this stricter sql_mode prevents some
+# mistakes like inserting invalid dates etc.
+#sql_mode		= NO_ENGINE_SUBSTITUTION,TRADITIONAL
+#
+# * InnoDB
+#
+# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
+# Read the manual for more InnoDB related options. There are many!
+default_storage_engine	= InnoDB
+# you can't just change log file size, requires special procedure
+#innodb_log_file_size	= 50M
+innodb_buffer_pool_size	= {{ innodb_buffer_pool_size }}
+innodb_log_buffer_size	= 8M
+innodb_file_per_table	= 1
+innodb_open_files	= 400
+innodb_io_capacity	= 400
+innodb_flush_method	= O_DIRECT
+innodb_buffer_pool_instances = {{ innodb_buffer_pool_instances }}
+
+aria_pagecache_buffer_size = {{ aria_pagecache_buffer_size }}
+#
+# * Security Features
+#
+# Read the manual, too, if you want chroot!
+# chroot = /var/lib/mysql/
+#
+# For generating SSL certificates I recommend the OpenSSL GUI "tinyca".
+#
+# ssl-ca=/etc/mysql/cacert.pem
+# ssl-cert=/etc/mysql/server-cert.pem
+# ssl-key=/etc/mysql/server-key.pem
+
+#
+# * Galera-related settings
+#
+[galera]
+# Mandatory settings
+#wsrep_on=ON
+#wsrep_provider=
+#wsrep_cluster_address=
+#binlog_format=row
+#default_storage_engine=InnoDB
+#innodb_autoinc_lock_mode=2
+#
+# Allow server to accept connections on all interfaces.
+#
+#bind-address=0.0.0.0
+#
+# Optional setting
+#wsrep_slave_threads=1
+#innodb_flush_log_at_trx_commit=0
+
+[mysqldump]
+quick
+quote-names
+max_allowed_packet	= 16M
+
+[mysql]
+#no-auto-rehash	# faster start of mysql but no tab completion
+
+[isamchk]
+key_buffer		= 16M
+
+#
+# * IMPORTANT: Additional settings that can override those from this file!
+#   The files must end with '.cnf', otherwise they'll be ignored.
+#
+!includedir /etc/mysql/conf.d/