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 DIR /srv/mariadb/conf etc/mysql MOUNT DIR /srv/mariadb/data var/lib/mysql USER 3306 3306 CMD mysqld HALT SIGTERM