docker/docs/examples/running_riak_service.md

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<!--[metadata]>
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title = "Dockerizing a Riak service"
description = "Build a Docker image with Riak pre-installed"
keywords = ["docker, example, package installation, networking, riak"]
[menu.main]
parent = "engine_dockerize"
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<![end-metadata]-->
# 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](https://hub.docker.com/_/ubuntu/) (tag:
`trusty`), which is available on [Docker Hub](https://hub.docker.com):
# Riak
#
# VERSION 0.1.1
# Use the Ubuntu base image provided by dotCloud
FROM ubuntu:trusty
MAINTAINER Hector Castro hector@basho.com
After that, we install the curl which is used to download the repository setup
script and we download the setup script and run it.
# Install Riak repository before we do apt-get update, so that update happens
# in a single step
RUN apt-get install -q -y curl && \
curl -fsSL https://packagecloud.io/install/repositories/basho/riak/script.deb | sudo bash
Then we install and setup a few dependencies:
- `supervisor` is used manage the Riak processes
- `riak=2.0.5-1` is the Riak package coded to version 2.0.5
<!-- -->
# Install and setup project dependencies
RUN apt-get update && \
apt-get install -y supervisor riak=2.0.5-1
RUN mkdir -p /var/log/supervisor
RUN locale-gen en_US en_US.UTF-8
COPY supervisord.conf /etc/supervisor/conf.d/supervisord.conf
After that, we modify Riak's configuration:
# Configure Riak to accept connections from any host
RUN sed -i "s|listener.http.internal = 127.0.0.1:8098|listener.http.internal = 0.0.0.0:8098|" /etc/riak/riak.conf
RUN sed -i "s|listener.protobuf.internal = 127.0.0.1:8087|listener.protobuf.internal = 0.0.0.0:8087|" /etc/riak/riak.conf
Then, we expose the Riak Protocol Buffers and HTTP interfaces:
# Expose Riak Protocol Buffers and HTTP interfaces
EXPOSE 8087 8098
Finally, run `supervisord` so that Riak is 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:riak]
command=bash -c "/usr/sbin/riak console"
numprocs=1
autostart=true
autorestart=true
user=riak
environment=HOME="/var/lib/riak"
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](
http://basho.com/why-your-riak-cluster-should-have-at-least-five-nodes/).
See the [docker-riak](https://github.com/hectcastro/docker-riak) project
details on how to deploy a Riak cluster using Docker and Pipework.