Dockerize Valkyrie's dependencies

[mbklein]

This PR moves Valkyrie's external dependencies (Fedora, Solr, and PostgreSQL) into Docker containers.

Changes:

• Adds docker-compose.yml files for development and test environments
• Updates some config files for compatibility with new server locations
• Removes fcrepo_wrapper and solr_wrapper and related rake tasks
• Provides new rake tasks for spinning up/bringing down/cleaning the dependency stack
• Update README with instructions for using the new stack
• Update circle.yml to make CircleCI use the new dependencies

[escowles]

When I try to spin this up, I get:

$ rake docker:dev:up
Unsupported config option for services service: 'solr_index'
rake aborted!
Docker::Compose::Error: 'up' failed with status 'pid 14511 exit 1': Unsupported config option for services service: 'solr_index'
/Users/escowles/.rbenv/versions/2.3.1/bin/bundle:23:in `load'
/Users/escowles/.rbenv/versions/2.3.1/bin/bundle:23:in `<main>'
Tasks: TOP => docker:dev:up
(See full trace by running task with --trace)

[tpendragon]

I wonder if we should keep both versions. I know some people at least have trouble getting Docker to work.

[escowles]

When I run rake docker:dev:up, I get an error message:

Couldn't connect to Docker daemon - you might need to run `docker-machine start default`.
rake aborted!
Docker::Compose::Error: 'up' failed with status 'pid 21346 exit 1': Couldn't connect to Docker daemon - you might need to run `docker-machine start default`.
/Users/escowles/.rbenv/versions/2.3.1/bin/bundle:23:in `load'
/Users/escowles/.rbenv/versions/2.3.1/bin/bundle:23:in `<main>'
Tasks: TOP => docker:dev:up
(See full trace by running task with --trace)

Is there something I need to start before running the rake task?

[mbklein]

If you installed the official Mac release, you might need to run the Docker app. Your menu bar should have this little guy in it:

[escowles]

I installed docker using homebrew:

$ brew install docker
$ brew install docker-machine
$ brew install docker-compose

And then I had to start it with:

$ docker-machine create default
$ docker-machine start default
$ eval "$(docker-machine env)"

For people who aren't familiar with Docker, it would be good to include that in the README.

Edit by @revgum : Added docker-compose install and docker-machine creation

[tpendragon]

@mbklein Can you add some directions on installing docker on Mac OSX? Maybe the directions @escowles posted would work, but mine varied a bit (used Docker for Mac or whatever)

[tpendragon]

@mbklein Are you going to be able to get back to this, or would you like me to take over documentation?

[revgum]

Added two steps in @escowles comment and got it up and running on my box in a snap. Great work and addition IMO!

Edit Almost all came up.. Solr was misbehaving for me, and after a bit of digging I figured out what was happening. I have a code directory that is symlinked to a mounted virtual disk, so that I can move all of my code and important stuff from one machine to another (old habits of migrating from an old machine to a new one). This might be worthwhile adding to the documentation:

Solr wouldn't start, and complained that it could not find the solrconfig.xml even though the docker-compose has the volume mounted!
VirtualBox hosting docker will automatically share the /Users directory to the VM. Mounting Docker volumes will function properly as long as the path is somewhere within the /Users path, and/or so long as the path isn't symlinked outside of the /Users directory.