Create MariaDB Docker container

mariadb.sh

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+#!/bin/sh
+
+SOURCE_DIR=$(realpath $(dirname "${0}"))/mariadb
+
+# Build Docker container
+docker build -t mariadb ${SOURCE_DIR}
+
+# Create MariaDB instance
+mkdir -p /srv/mariadb/data
+chown 3306:3306 /srv/mariadb/data
+docker run --rm --name mariadb -h mariadb -v /srv/mariadb/data:/var/lib/mysql mariadb mysql_install_db --user=mysql
+
+# Configure MariaDB
+cp ${SOURCE_DIR}/srv/mariadb/my.cnf /srv/mariadb/my.cnf
+
+# Enable query logging. Only if the DEBUG environment variable is set
+if [ ${DEBUG:-0} -eq 1 ]; then
+    sed -i 's/#general_log/general_log/g' /srv/mariadb/my.cnf
+fi
+
+# Configure MariaDB service
+cp ${SOURCE_DIR}/etc/init.d/mariadb /etc/init.d/mariadb
+rc-update add mariadb boot
+service mariadb start
+
+# Configure MariaDB admin
+cat ${SOURCE_DIR}/adminpwd.sql | docker exec -i mariadb mysql

mariadb/Dockerfile

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+FROM alpine:3.7
+MAINTAINER Disassembler <disassembler@dasm.cz>
+
+RUN \
+ # Create OS user (which will be picked up later by apk add)
+ addgroup -S -g 3306 mysql \
+ && adduser -S -u 3306 -h /var/lib/mysql -s /bin/nologin -g mysql -G mysql mysql \
+ # Install MariaDB
+ && apk --no-cache add mariadb mariadb-client
+
+VOLUME ["/etc/mysql", "/var/lib/mysql"]
+EXPOSE 3306
+
+CMD ["mysqld_safe"]

mariadb/adminpwd.sql

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+DELETE FROM mysql.user WHERE User != 'root' OR Host != 'localhost';
+INSTALL PLUGIN unix_socket SONAME 'auth_socket';
+UPDATE mysql.user SET plugin='unix_socket';
+FLUSH PRIVILEGES;
+DROP DATABASE test;

mariadb/etc/init.d/mariadb

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+#!/sbin/openrc-run
+
+description="MariaDB docker container"
+
+depend() {
+	need docker net
+	use dns logger netmount
+}
+
+start() {
+	/usr/bin/docker run -d --rm --name mariadb -h mariadb -v /srv/mariadb/my.cnf:/etc/mysql/my.cnf -v /srv/mariadb/data:/var/lib/mysql mariadb
+}
+
+stop() {
+	/usr/bin/docker kill mariadb
+}

mariadb/srv/mariadb/my.cnf

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+# Example MariaDB config file for medium systems.
+#
+# This is for a system with little memory (32M - 64M) where MariaDB plays
+# an important part, or systems up to 128M where MariaDB is used together with
+# other programs (such as a web server)
+#
+# MariaDB programs look for option files in a set of
+# locations which depend on the deployment platform.
+# You can copy this option file to one of those
+# locations. For information about these locations, do:
+# 'my_print_defaults --help' and see what is printed under
+# Default options are read from the following files in the given order:
+# More information at: http://dev.mysql.com/doc/mysql/en/option-files.html
+#
+# In this file, you can use all long options that a program supports.
+# If you want to know which options a program supports, run the program
+# with the "--help" option.
+
+# The following options will be passed to all MariaDB clients
+[client]
+port            = 3306
+socket          = /run/mysqld/mysqld.sock
+
+[mysqld]
+port            = 3306
+socket          = /run/mysqld/mysqld.sock
+skip-external-locking
+key_buffer_size = 16M
+max_allowed_packet = 1M
+table_open_cache = 64
+sort_buffer_size = 512K
+net_buffer_length = 8K
+read_buffer_size = 256K
+read_rnd_buffer_size = 512K
+myisam_sort_buffer_size = 8M
+
+#general_log    = 1
+
+# Replication Master Server (default)
+# binary logging is required for replication
+log-bin=mysql-bin
+
+# binary logging format - mixed recommended
+binlog_format=mixed
+
+# required unique id between 1 and 2^32 - 1
+# defaults to 1 if master-host is not set
+# but will not function as a master if omitted
+server-id       = 1
+
+# Uncomment the following if you are using InnoDB tables
+innodb_data_home_dir = /var/lib/mysql
+innodb_data_file_path = ibdata1:10M:autoextend
+innodb_log_group_home_dir = /var/lib/mysql
+# You can set .._buffer_pool_size up to 50 - 80 %
+# of RAM but beware of setting memory usage too high
+innodb_buffer_pool_size = 16M
+innodb_additional_mem_pool_size = 2M
+# Set .._log_file_size to 25 % of buffer pool size
+innodb_log_file_size = 5M
+innodb_log_buffer_size = 8M
+innodb_flush_log_at_trx_commit = 1
+innodb_lock_wait_timeout = 50
+
+[mysqldump]
+quick
+max_allowed_packet = 16M
+
+[mysql]
+no-auto-rehash
+# Remove the next comment character if you are not familiar with SQL
+#safe-updates
+
+[myisamchk]
+key_buffer_size = 20M
+sort_buffer_size = 20M
+read_buffer = 2M
+write_buffer = 2M
+
+[mysqlhotcopy]
+interactive-timeout