Docker can't start MariaDB/MySQL during Docker build - mysql

Question

My current Dockerfile looks like this:
FROM ubuntu:14.04
ENV DEBIAN_FRONTEND noninteractive
ENV INITRD No
ENV LANG en_US.UTF-8
# Maria DB Versions
ENV MARIADB_MAJOR 5.5
ENV MARIADB_VERSION 5.5.55+maria-1~trusty
# Create mysql user and group
RUN groupadd -r mysql && useradd -r -g mysql mysql
# Install needed dependencies
RUN apt-get update && apt-get install -y --no-install-recommends software-properties-common && rm -rf /var/lib/apt/lists/*
# Add the MariaDB PGP key to verify their Debian packages.
RUN apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 0xcbcb082a1bb943db
# Add MariaDB's repository. We use the Ubuntu 14.04 version as there ain't no MariaDB 5.5 for Ubuntu 16.04.
RUN add-apt-repository 'deb http://mirror.jmu.edu/pub/mariadb/repo/5.5/ubuntu trusty main'
# Install Maria DB and open the access for outside of the container
RUN apt-get update \
&& apt-get install -y --no-install-recommends mariadb-server=$MARIADB_VERSION \
&& rm -rf /var/lib/apt/lists/* \
&& sed -i 's/^\(bind-address\s.*\)/# \1/' /etc/mysql/my.cnf \
&& update-rc.d -f mysql disable
# Run as user mysql
USER mysql
# Start the MariaDB to add a user and create the DB
RUN mysqld
RUN echo "#TODO: Create DB, User and grant access"
# Expose Port
EXPOSE 3306
When building the container using docker build -t testmariadb . I get the following output:
Step 13/17 : RUN mysqld
---> Running in 5aeb49c81f5e
170428 20:00:25 [Note] mysqld (mysqld 5.5.55-MariaDB-1~trusty) starting as process 7 ...
170428 20:00:25 InnoDB: The InnoDB memory heap is disabled
170428 20:00:25 InnoDB: Mutexes and rw_locks use GCC atomic builtins
170428 20:00:25 InnoDB: Compressed tables use zlib 1.2.8
170428 20:00:25 InnoDB: Using Linux native AIO
170428 20:00:25 InnoDB: Initializing buffer pool, size = 256.0M
170428 20:00:25 InnoDB: Completed initialization of buffer pool
InnoDB: The first specified data file ./ibdata1 did not exist:
InnoDB: a new database to be created!
170428 20:00:25 InnoDB: Setting file ./ibdata1 size to 10 MB
InnoDB: Database physically writes the file full: wait...
170428 20:00:25 InnoDB: Log file ./ib_logfile0 did not exist: new to be created
InnoDB: Setting log file ./ib_logfile0 size to 5 MB
InnoDB: Database physically writes the file full: wait...
170428 20:00:25 InnoDB: Log file ./ib_logfile1 did not exist: new to be created
InnoDB: Setting log file ./ib_logfile1 size to 5 MB
InnoDB: Database physically writes the file full: wait...
InnoDB: Doublewrite buffer not found: creating new
InnoDB: Doublewrite buffer created
InnoDB: 127 rollback segment(s) active.
InnoDB: Creating foreign key constraint system tables
InnoDB: Foreign key constraint system tables created
170428 20:00:25 InnoDB: Waiting for the background threads to start
170428 20:00:26 Percona XtraDB (http://www.percona.com) 5.5.52-MariaDB-38.3 started; log sequence number 0
170428 20:00:26 [Note] Plugin 'FEEDBACK' is disabled.
170428 20:00:26 [Note] Server socket created on IP: '0.0.0.0'.
170428 20:00:26 [Note] Event Scheduler: Loaded 0 events
170428 20:00:26 [Note] mysqld: ready for connections.
Version: '5.5.55-MariaDB-1~trusty' socket: '/var/run/mysqld/mysqld.sock' port: 3306 mariadb.org binary distribution
As far as I can tell, it starts the MariaDB, but then is stuck there and doesn't execute a next command. Is there another way to start MariaDB in docker?

Answer 1

1)It is not stuck. The MariaDB start running. But you need to use CMD command and not RUN command to achieve your purpose.
The command CMD, similarly to RUN, can be used for executing a specific command. However, unlike RUN it is not executed during build, but when a container is instantiated using the image being built.
2) The last part of your dockerfile should look like this
#Run as user mysql
USER mysql
RUN echo "#TODO: Create DB, User and grant access"
#Expose Port
EXPOSE 3306
#Right way to run mysqld
CMD ["mysqld"]
For building your image
docker build -t testmariadb .
For running the built image
docker run testmariadb
OR ( for detached mode )
docker run -d testmariadb
3) Please ask your self why are you using ubuntu base image (FROM ubuntu:14.04). According to me you should use https://hub.docker.com/_/mariadb/ if you just want to run mariaDb in the container.

Answer 2

For running container what docker command you are using?
Please follow official Docker file for MariaDB.
Docker MariaDB
Here is latest DockerFile MariaDB

Answer 3

this is wrong
# Start the MariaDB to add a user and create the DB
RUN mysqld
I guess you wanted
CMD mysqld
or such
see from
https://github.com/docker-library/mysql/blob/7a850980c4b0d5fb5553986d280ebfb43230a6bb/8.0/Dockerfile
the end is
EXPOSE 3306
CMD ["mysqld"]
RUN, WORKDIR, ADD, COPY, ENV (and some others) helps you for configuring your docker image, ENTRYPOINT and CMD for starting your software (nginx for a nginx image, Wordpress...)
The doc
https://docs.docker.com/engine/reference/builder/