etc and var customers

etc/mysql/conf.d/mysql.cnf

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+[mysql]

etc/mysql/conf.d/mysqldump.cnf

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+[mysqldump]
+quick
+quote-names
+max_allowed_packet	= 16M

etc/mysql/mariadb.cnf

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+# The MariaDB configuration file
+#
+# The MariaDB/MySQL tools read configuration files in the following order:
+# 0. "/etc/mysql/my.cnf" symlinks to this file, reason why all the rest is read.
+# 1. "/etc/mysql/mariadb.cnf" (this file) to set global defaults,
+# 2. "/etc/mysql/conf.d/*.cnf" to set global options.
+# 3. "/etc/mysql/mariadb.conf.d/*.cnf" to set MariaDB-only options.
+# 4. "~/.my.cnf" to set user-specific options.
+#
+# If the same option is defined multiple times, the last one will apply.
+#
+# 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.
+#
+# If you are new to MariaDB, check out https://mariadb.com/kb/en/basic-mariadb-articles/
+
+#
+# This group is read both by the client and the server
+# use it for options that affect everything
+#
+[client-server]
+# Port or socket location where to connect
+# port = 3306
+socket = /run/mysqld/mysqld.sock
+
+# Import all .cnf files from configuration directory
+!includedir /etc/mysql/conf.d/
+!includedir /etc/mysql/mariadb.conf.d/

etc/mysql/mariadb.conf.d/50-client.cnf

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+#
+# This group is read by the client library
+# Use it for options that affect all clients, but not the server
+#
+
+[client]
+# Example of client certificate usage
+#ssl-cert = /etc/mysql/client-cert.pem
+#ssl-key  = /etc/mysql/client-key.pem
+#
+# Allow only TLS encrypted connections
+#ssl-verify-server-cert = on
+
+# This group is *never* read by mysql client library, though this
+# /etc/mysql/mariadb.cnf.d/client.cnf file is not read by Oracle MySQL
+# client anyway.
+# If you use the same .cnf file for MySQL and MariaDB,
+# use it for MariaDB-only client options
+[client-mariadb]

etc/mysql/mariadb.conf.d/50-mysql-clients.cnf

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+#
+# These groups are read by MariaDB command-line tools
+# Use it for options that affect only one utility
+#
+
+[mysql]
+
+[mysql_upgrade]
+
+[mysqladmin]
+
+[mysqlbinlog]
+
+[mysqlcheck]
+
+[mysqldump]
+
+[mysqlimport]
+
+[mysqlshow]
+
+[mysqlslap]

etc/mysql/mariadb.conf.d/60-galera.cnf

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+#
+# * Galera-related settings
+#
+# See the examples of server wsrep.cnf files in /usr/share/mysql
+# and read more at https://mariadb.com/kb/en/galera-cluster/
+
+[galera]
+# Mandatory settings
+#wsrep_on                 = ON
+#wsrep_cluster_name       = "MariaDB Galera Cluster"
+#wsrep_cluster_address    = gcomm://
+#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 settings
+#wsrep_slave_threads = 1
+#innodb_flush_log_at_trx_commit = 0

etc/mysql/my.cnf

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+/etc/alternatives/my.cnf

etc/mysql/my.cnf.fallback

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+#
+# The MySQL database server configuration file.
+#
+# You can copy this 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.
+
+# Here is entries for some specific programs
+# The following values assume you have at least 32M ram
+
+!includedir /etc/mysql/conf.d/