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# Juju Charms for Deploying Bigtop
## Overview
These are the charm layers used to build Juju charms for deploying Bigtop
components. The charms are also published to the [Juju charm store][] and
can be deployed directly from there using [bundles][], or they can be
built from these layers and deployed locally.
Charms allow you to deploy, configure, and connect a Apache Bigtop cluster
on any supported cloud, which can be easily scaled to meet workload demands.
You can also easily connect other, non-Bigtop components from the
[Juju charm store][] that support common interfaces.
[Juju charm store]: https://jujucharms.com/
[bundles]: https://jujucharms.com/u/bigdata-dev/hadoop-processing
## Building the Bigtop Charms
To build these charms, you will need [charm-tools][]. You should also read
over the developer [Getting Started][] page for an overview of charms and
building them. Then, in any of the charm layer directories, use `charm build`.
For example:
export JUJU_REPOSITORY=$HOME/charms
mkdir $HOME/charms
cd bigtop-packages/src/charms/hadoop/layer-hadoop-namenode
charm build
This will build the NameNode charm, pulling in the appropriate base and
interface layers from [interfaces.juju.solutions][]. You can get local copies
of those layers as well using `charm pull-source`:
export LAYER_PATH=$HOME/layers
export INTERFACE_PATH=$HOME/interfaces
mkdir $HOME/{layers,interfaces}
charm pull-source layer:apache-bigtop-base
charm pull-source interface:dfs
You can then deploy the locally built charms individually:
juju deploy local:trusty/hadoop-namenode
You can also use the local version of a bundle:
juju deploy bigtop-deploy/juju/hadoop-processing/bundle-local.yaml
> Note: With Juju versions < 2.0, you will need to use [juju-deployer][] to
deploy the local bundle.
[charm-tools]: https://jujucharms.com/docs/stable/tools-charm-tools
[Getting Started]: https://jujucharms.com/docs/devel/developer-getting-started
[interfaces.juju.solutions]: http://interfaces.juju.solutions/
[juju-deployer]: https://pypi.python.org/pypi/juju-deployer/
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