moby--moby/docs/sources/examples/running_riak_service.md

page_title: Dockerizing a Riak service page_description: Build a Docker image with Riak pre-installed page_keywords: docker, example, package installation, networking, riak

Dockerizing a Riak Service

The goal of this example is to show you how to build a Docker image with Riak pre-installed.

Creating a Dockerfile

Create an empty file called Dockerfile:

$ touch Dockerfile

Next, define the parent image you want to use to build your image on top of. We'll use Ubuntu (tag: latest), which is available on Docker Hub:

# Riak
#
# VERSION       0.1.0

# Use the Ubuntu base image provided by dotCloud
FROM ubuntu:latest
MAINTAINER Hector Castro hector@basho.com

Next, we update the APT cache and apply any updates:

# Update the APT cache
RUN sed -i.bak 's/main$/main universe/' /etc/apt/sources.list
RUN apt-get update
RUN apt-get upgrade -y

After that, we install and setup a few dependencies:

• curl is used to download Basho's APT repository key
• lsb-release helps us derive the Ubuntu release codename
• openssh-server allows us to login to containers remotely and join Riak nodes to form a cluster
• supervisor is used manage the OpenSSH and Riak processes

# Install and setup project dependencies
RUN apt-get install -y curl lsb-release supervisor openssh-server

RUN mkdir -p /var/run/sshd
RUN mkdir -p /var/log/supervisor

RUN locale-gen en_US en_US.UTF-8

ADD supervisord.conf /etc/supervisor/conf.d/supervisord.conf

RUN echo 'root:basho' | chpasswd

Next, we add Basho's APT repository:

RUN curl -s http://apt.basho.com/gpg/basho.apt.key | apt-key add --
RUN echo "deb http://apt.basho.com $(lsb_release -cs) main" > /etc/apt/sources.list.d/basho.list
RUN apt-get update

After that, we install Riak and alter a few defaults:

# Install Riak and prepare it to run
RUN apt-get install -y riak
RUN sed -i.bak 's/127.0.0.1/0.0.0.0/' /etc/riak/app.config
RUN echo "ulimit -n 4096" >> /etc/default/riak

Almost there. Next, we add a hack to get us by the lack of initctl:

# Hack for initctl
# See: https://github.com/dotcloud/docker/issues/1024
RUN dpkg-divert --local --rename --add /sbin/initctl
RUN ln -s /bin/true /sbin/initctl

Then, we expose the Riak Protocol Buffers and HTTP interfaces, along with SSH:

# Expose Riak Protocol Buffers and HTTP interfaces, along with SSH
EXPOSE 8087 8098 22

Finally, run supervisord so that Riak and OpenSSH are started:

CMD ["/usr/bin/supervisord"]

Create a supervisord configuration file

Create an empty file called supervisord.conf. Make sure it's at the same directory level as your Dockerfile:

touch supervisord.conf

Populate it with the following program definitions:

[supervisord]
nodaemon=true

[program:sshd]
command=/usr/sbin/sshd -D
stdout_logfile=/var/log/supervisor/%(program_name)s.log
stderr_logfile=/var/log/supervisor/%(program_name)s.log
autorestart=true

[program:riak]
command=bash -c ". /etc/default/riak && /usr/sbin/riak console"
pidfile=/var/log/riak/riak.pid
stdout_logfile=/var/log/supervisor/%(program_name)s.log
stderr_logfile=/var/log/supervisor/%(program_name)s.log

Build the Docker image for Riak

Now you should be able to build a Docker image for Riak:

$ docker build -t "<yourname>/riak" .

Next steps

Riak is a distributed database. Many production deployments consist of at least five nodes. See the docker-riak project details on how to deploy a Riak cluster using Docker and Pipework.