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Sebastiaan van Stijn 9cf29be0ee Add -f flag to cURL install instructions

From the -f description:

(HTTP) Fail silently (no output at all) on server errors. This is mostly done
to better enable scripts etc to better deal with failed attempts. In normal
cases when an HTTP server fails to deliver a document, it returns an HTML
document stating so (which often also describes why and more). This flag will
prevent curl from outputting that and return error 22.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

2016-01-06 16:05:16 +01:00

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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: trusty), which is available on Docker Hub:

# 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. See the docker-riak project details on how to deploy a Riak cluster using Docker and Pipework.

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