IMAGE mariadb
LAYER shared/alpine3.9
LAYER mariadb/mariadb

RUN EOF
    # 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/false -g mysql -G mysql mysql

    # Install MariaDB
    apk --no-cache add mariadb mariadb-client

    # Create socket directory
    mkdir /run/mysqld
    chown mysql:mysql /run/mysqld
EOF

MOUNT FILE /srv/mariadb/conf/my.cnf etc/my.cnf
MOUNT DIR /srv/mariadb/data var/lib/mysql

USER 3306 3306
CMD mysqld
HALT SIGTERM