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151 lines
4.1 KiB
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:title: Running a Riak service
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:description: Build a Docker image with Riak pre-installed
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:keywords: docker, example, package installation, networking, riak
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Riak Service
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==============================
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.. include:: example_header.inc
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The goal of this example is to show you how to build a Docker image with Riak
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pre-installed.
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Creating a ``Dockerfile``
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+++++++++++++++++++++++++
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Create an empty file called ``Dockerfile``:
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.. code-block:: bash
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touch Dockerfile
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Next, define the parent image you want to use to build your image on top of.
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We’ll use `Ubuntu <https://index.docker.io/_/ubuntu/>`_ (tag: ``latest``),
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which is available on the `docker index <http://index.docker.io>`_:
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.. code-block:: bash
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# Riak
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#
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# VERSION 0.1.0
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# Use the Ubuntu base image provided by dotCloud
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FROM ubuntu:latest
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MAINTAINER Hector Castro hector@basho.com
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Next, we update the APT cache and apply any updates:
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.. code-block:: bash
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# Update the APT cache
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RUN sed -i.bak 's/main$/main universe/' /etc/apt/sources.list
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RUN apt-get update
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RUN apt-get upgrade -y
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After that, we install and setup a few dependencies:
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- ``curl`` is used to download Basho's APT repository key
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- ``lsb-release`` helps us derive the Ubuntu release codename
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- ``openssh-server`` allows us to login to containers remotely and join Riak
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nodes to form a cluster
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- ``supervisor`` is used manage the OpenSSH and Riak processes
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.. code-block:: bash
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# Install and setup project dependencies
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RUN apt-get install -y curl lsb-release supervisor openssh-server
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RUN mkdir -p /var/run/sshd
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RUN mkdir -p /var/log/supervisor
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RUN locale-gen en_US en_US.UTF-8
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ADD supervisord.conf /etc/supervisor/conf.d/supervisord.conf
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RUN echo 'root:basho' | chpasswd
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Next, we add Basho's APT repository:
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.. code-block:: bash
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RUN curl -s http://apt.basho.com/gpg/basho.apt.key | apt-key add --
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RUN echo "deb http://apt.basho.com $(lsb_release -cs) main" > /etc/apt/sources.list.d/basho.list
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RUN apt-get update
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After that, we install Riak and alter a few defaults:
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.. code-block:: bash
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# Install Riak and prepare it to run
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RUN apt-get install -y riak
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RUN sed -i.bak 's/127.0.0.1/0.0.0.0/' /etc/riak/app.config
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RUN echo "ulimit -n 4096" >> /etc/default/riak
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Almost there. Next, we add a hack to get us by the lack of ``initctl``:
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.. code-block:: bash
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# Hack for initctl
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# See: https://github.com/dotcloud/docker/issues/1024
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RUN dpkg-divert --local --rename --add /sbin/initctl
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RUN ln -sf /bin/true /sbin/initctl
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Then, we expose the Riak Protocol Buffers and HTTP interfaces, along with SSH:
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.. code-block:: bash
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# Expose Riak Protocol Buffers and HTTP interfaces, along with SSH
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EXPOSE 8087 8098 22
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Finally, run ``supervisord`` so that Riak and OpenSSH are started:
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.. code-block:: bash
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CMD ["/usr/bin/supervisord"]
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Create a ``supervisord`` configuration file
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+++++++++++++++++++++++++++++++++++++++++++
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Create an empty file called ``supervisord.conf``. Make sure it's at the same
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directory level as your ``Dockerfile``:
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.. code-block:: bash
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touch supervisord.conf
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Populate it with the following program definitions:
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.. code-block:: bash
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[supervisord]
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nodaemon=true
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[program:sshd]
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command=/usr/sbin/sshd -D
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stdout_logfile=/var/log/supervisor/%(program_name)s.log
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stderr_logfile=/var/log/supervisor/%(program_name)s.log
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autorestart=true
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[program:riak]
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command=bash -c ". /etc/default/riak && /usr/sbin/riak console"
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pidfile=/var/log/riak/riak.pid
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stdout_logfile=/var/log/supervisor/%(program_name)s.log
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stderr_logfile=/var/log/supervisor/%(program_name)s.log
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Build the Docker image for Riak
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+++++++++++++++++++++++++++++++
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Now you should be able to build a Docker image for Riak:
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.. code-block:: bash
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docker build -t "<yourname>/riak" .
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Next steps
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++++++++++
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Riak is a distributed database. Many production deployments consist of `at
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least five nodes <http://basho.com/why-your-riak-cluster-should-have-at-least-
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five-nodes/>`_. See the `docker-riak <https://github.com/hectcastro /docker-
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riak>`_ project details on how to deploy a Riak cluster using Docker and
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Pipework.
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