add support to set config variables

defaults/main.yml

@@ -11,4 +11,5 @@ mariadb:
 #    database:
 #      collation: utf8_general_ci
 #      encoding: utf8
-
+  config:
+    "bind-address": "127.0.0.1"

tasks/main.yml

@@ -5,6 +5,15 @@
     - mariadb-server
     - python3-mysqldb
 
+- name: deploy mariadb config
+  notify: restart mariadb
+  template:
+    src: 50-server.cnf.j2
+    dest: /etc/mysql/mariadb.conf.d/50-server.cnf
+    mode: "0644"
+    owner: root
+    group: root
+
 - name: create mariadb dbs
   mysql_db:
     login_unix_socket: /var/run/mysqld/mysqld.sock

templates/50-server.cnf.j2

@@ -0,0 +1,117 @@
+#
+# These groups are read by MariaDB server.
+# Use it for options that only the server (but not clients) should see
+
+# this is read by the standalone daemon and embedded servers
+[server]
+
+# this is only for the mysqld standalone daemon
+[mysqld]
+
+#
+# * Basic Settings
+#
+
+user                    = mysql
+pid-file                = /run/mysqld/mysqld.pid
+basedir                 = /usr
+datadir                 = /var/lib/mysql
+tmpdir                  = /tmp
+lc-messages-dir         = /usr/share/mysql
+lc-messages             = en_US
+skip-external-locking
+
+# Broken reverse DNS slows down connections considerably and name resolve is
+# safe to skip if there are no "host by domain name" access grants
+#skip-name-resolve
+
+# Instead of skip-networking the default is now to listen only on
+# localhost which is more compatible and is not less secure.
+bind-address            = {{ mariadb.config["bind-address"] }}
+
+#
+# * Fine Tuning
+#
+
+#key_buffer_size        = 128M
+#max_allowed_packet     = 1G
+#thread_stack           = 192K
+#thread_cache_size      = 8
+# This replaces the startup script and checks MyISAM tables if needed
+# the first time they are touched
+#myisam_recover_options = BACKUP
+#max_connections        = 100
+#table_cache            = 64
+
+#
+# * Logging and Replication
+#
+
+# Both location gets rotated by the cronjob.
+# Be aware that this log type is a performance killer.
+# Recommend only changing this at runtime for short testing periods if needed!
+#general_log_file       = /var/log/mysql/mysql.log
+#general_log            = 1
+
+# When running under systemd, error logging goes via stdout/stderr to journald
+# and when running legacy init error logging goes to syslog due to
+# /etc/mysql/conf.d/mariadb.conf.d/50-mysqld_safe.cnf
+# Enable this if you want to have error logging into a separate file
+#log_error = /var/log/mysql/error.log
+# Enable the slow query log to see queries with especially long duration
+#slow_query_log_file    = /var/log/mysql/mariadb-slow.log
+#long_query_time        = 10
+#log_slow_verbosity     = query_plan,explain
+#log-queries-not-using-indexes
+#min_examined_row_limit = 1000
+
+# 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
+#log_bin                = /var/log/mysql/mysql-bin.log
+expire_logs_days        = 10
+#max_binlog_size        = 100M
+
+#
+# * SSL/TLS
+#
+
+# For documentation, please read
+# https://mariadb.com/kb/en/securing-connections-for-client-and-server/
+#ssl-ca = /etc/mysql/cacert.pem
+#ssl-cert = /etc/mysql/server-cert.pem
+#ssl-key = /etc/mysql/server-key.pem
+#require-secure-transport = on
+
+#
+# * Character sets
+#
+
+# MySQL/MariaDB default is Latin1, but in Debian we rather default to the full
+# utf8 4-byte character set. See also client.cnf
+character-set-server  = utf8mb4
+collation-server      = utf8mb4_general_ci
+
+#
+# * 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!
+# Most important is to give InnoDB 80 % of the system RAM for buffer use:
+# https://mariadb.com/kb/en/innodb-system-variables/#innodb_buffer_pool_size
+#innodb_buffer_pool_size = 8G
+
+# this is only for embedded server
+[embedded]
+
+# This group is only read by MariaDB servers, not by MySQL.
+# If you use the same .cnf file for MySQL and MariaDB,
+# you can put MariaDB-only options here
+[mariadb]
+
+# This group is only read by MariaDB-10.5 servers.
+# If you use the same .cnf file for MariaDB of different versions,
+# use this group for options that older servers don't understand
+[mariadb-10.5]