MariaDB Docker image running on Alpine Linux
This Docker image (yobasystems/alpine-mariadb) is based on the minimal Alpine Linux with MariaDB v10.3.13 (MySQL Compatible) database server.
Alpine Version 3.9.4 (Released May 09, 2019)
MariaDB Version 10.3.13
What is Alpine Linux?
Alpine Linux is a Linux distribution built around musl libc and BusyBox. The image is only 5 MB in size and has access to a package repository that is much more complete than other BusyBox based images. This makes Alpine Linux a great image base for utilities and even production applications. Read more about Alpine Linux here and you can see how their mantra fits in right at home with Docker images.
What is MariaDB?
MariaDB Server is one of the most popular database servers in the world. It’s made by the original developers of MySQL and guaranteed to stay open source. Notable users include Wikipedia, WordPress.com and Google.
MariaDB turns data into structured information in a wide array of applications, ranging from banking to websites. It is an enhanced, drop-in replacement for MySQL. MariaDB is used because it is fast, scalable and robust, with a rich ecosystem of storage engines, plugins and many other tools make it very versatile for a wide variety of use cases.
MariaDB is developed as open source software and as a relational database it provides an SQL interface for accessing data. The latest versions of MariaDB also include GIS and JSON features.
- Minimal size only, minimal layers
- Memory usage is minimal on a simple install.
- MariaDB the MySQL replacement
:x86_64 - 64 bit Intel/AMD (x86_64/amd64)
:aarch64 - 64 bit ARM (ARMv8/aarch64)
:armhf - 32 bit ARM (ARMv7/armhf)
:latest latest branch based (Automatic Architecture Selection)
:master master branch usually inline with latest
:x86_64 amd64 based on latest tag but amd64 architecture
:arm64v8 Armv8 based on latest tag but arm64 architecture
:arm32v7 Armv7 based on latest tag but arm32 architecture
Layers & Sizes
/var/lib/mysql: Database files
/var/lib/mysql/mysql-bin: MariaDB logs
Main Mariadb parameters:
MYSQL_DATABASE: specify the name of the database
MYSQL_USER: specify the User for the database
MYSQL_PASSWORD: specify the User password for the database
MYSQL_ROOT_PASSWORD: specify the root password for Mariadb
Creating an instance
docker run -it --name mysql -p 3306:3306 -v /var/lib/mysql:/var/lib/mysql -e MYSQL_DATABASE=wordpressdb -e MYSQL_USER=wordpressuser -e MYSQL_PASSWORD=hguyFt6S95dgfR4ryb -e MYSQL_ROOT_PASSWORD=hguyFtgfR4r9R4r76 yobasystems/alpine-mariadb
It will create a new db, and set mysql root password (default is RaNd0MpA$$W0Rd generated by pwgen) unless the data already exists.
Configuration without a cnf file
Many configuration options can be passed as flags to mysqld. This will give you the flexibility to customize the container without needing a cnf file. For example, if you want to change the default encoding and collation for all tables to use UTF-8 (utf8mb4) just run the following:
docker run --name some-mariadb -e MYSQL_ROOT_PASSWORD=my-secret-pw -d yobasystems/alpine-mariadb --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci
Initializing a fresh instance
When a container is started for the first time, a new database with the specified name will be created and initialized with the provided configuration variables. Furthermore, it will execute files with extensions .sh, .sql and .sql.gz that are found in /docker-entrypoint-initdb.d. Files will be executed in alphabetical order. You can easily populate your mariadb services by mounting a SQL dump into that directory and provide custom images with contributed data. SQL files will be imported by default to the database specified by the MYSQL_DATABASE variable.
Docker Compose example:
(Please pass your own credentials or let them be generated automatically, don't use these ones for production!!)