Docker compose environment

[joaquincasares]

This PR is dependent on #135.

This is the last PR in an effort to to deprecate #46.

This adds a sample Cassandra node, including all the required settings and Docker Compose services in order to run Reaper in a clean and isolated environment with the only dependencies being Docker and Docker Compose.

I've also included a semi-lengthy, in-depth view of Docker Compose infrastructure within ./docker/README.md. At the end of this README, are instructions for how to run Dockerized Reaper within production environments.

[rustyrazorblade]

I don't think we should be assuming RF=1 anywhere.

[michaelsembwever]

this RF (i presume) it only for the one-node-cassandra within the docker container.

Maybe it's the applicaton's responsibility to log a warning at startup if RF=1 and N>1
wdyt?

[joaquincasares]

+1 on having an application logging if the RF is set lower than expected.

[michaelsembwever]

@joaquincasares you can't merge master into branches.
ref 01c939a

Branches (that are intended for master) must be rebased off master.

[michaelsembwever]

I don't think it's related to this PR, but
make all fails for me (linux) with

fpm -s dir -t deb -n reaper -v `mvn org.apache.maven.plugins:maven-help-plugin:2.1.1:evaluate -Dexpression=project.version | grep -v '\['` --pre-install debian/preinstall.sh -C build .

[ossarga]

Fails for me on (Mac OS X). You are right @michaelsembwever it is unrelated because I see the same problem on the master branch.

[michaelsembwever]

The docker commands now work for me! (a couple of local pax issues i had to overcome)

[joaquincasares]

reaper_db Replication Factor

@rustyrazorblade @michaelsembwever reaper_db now defaults to an RF of 1, but providing an additional argument will overwrite the default of 1, for 3, for example:

docker-compose run initialize-reaper_db 3

Rebased

@michaelsembwever I've rebased and force pushed into the same branch.

Makefile

@michaelsembwever @ossarga I did change the Make command on #134 to move from $() to using backticks (`) in order to get the build command working within an Ubuntu Docker container. I know it definitely works within Docker, but not sure how to support both, or to instead just name Docker as the only prerequisite for the build process.

I'd vote for the latter to simplify all documentation around the Make command and ensure the process works across all flavors of Linux and versions of OS X, without the need for many dependencies as the dependency list is currently quite high:

• https://github.com/thelastpickle/cassandra-reaper/blob/master/docker-build/Dockerfile#L8-L25

While I do notice that nodejs is only needed for building the UI, and that git and ruby-dev are downstream dependencies for also building the UI, if we were to not go along the Docker-first path for building our packages, we'll have to update our documentation for the following processes:

• How to build on OS X
• How to build on Linux
• How to build with Docker
• How to build the UI in OS X
• How to build the UI in Linux
• How to build the UI in Docker

The current documenation is essentially:

• Install Docker and Docker Compose.
• Run the following command:
  • https://github.com/thelastpickle/cassandra-reaper#docker

Local pax Issues

@michaelsembwever could you elaborate please?

[michaelsembwever]

@michaelsembwever could you elaborate please?

i've solved this, it was a local issue around PaX controls.