Setting sample config for container development

[alaxalves]

Added yaml file with sample docker configuration to make easier and faster developing to ruby-lang. Also added examples in README on how to use either Docker or Docker-Compose.

[stomar]

(Someone else needs to review this PR, due to lacking knowledge about docker.)

Does this imply that I would run some third-party docker image on my system?

[alaxalves]

@stomar The image used is in the docker-compose.yml and it is the official ruby image maintained by the Ruby Team Reference, so we wouldn't need to maintain any image. In order to test this out you must install Docker and Docker Compose. After you have those installed all you have to do is going to ruby-lang's root (where the docker-compose.yml file is located) and run on your terminal:

$ docker-compose up

After that, when you see the rake serve message go to localhost:9292/ on your browser and check if everything is ok.
I have also added instructions in README to run ruby-lang only using docker here.

[jcserracampos]

@alaxalves Please, update your Gemfile.lock to use bundler 2.0 or greater.

When using the container the following is throw:

Starting ruby-lang ... done
Attaching to ruby-lang
ruby-lang | You must use Bundler 2 or greater with this lockfile.
ruby-lang | You must use Bundler 2 or greater with this lockfile.
ruby-lang exited with code 20

See jekyll/jekyll#7463 for more information.

[alaxalves]

@alaxalves Please, update your Gemfile.lock to use bundler 2.0 or greater.

When using the container the following is throw:

Starting ruby-lang ... done
Attaching to ruby-lang
ruby-lang | You must use Bundler 2 or greater with this lockfile.
ruby-lang | You must use Bundler 2 or greater with this lockfile.
ruby-lang exited with code 20

See jekyll/jekyll#7463 for more information.

It's done!

[znz]

You can use <http://localhost:9292/> instead of [http://localhost:9292/](http://localhost:9292/).

[yous]

Maybe this can be updated? It seems that 2.6.4 is available: https://hub.docker.com/_/ruby. Currently .travis.yml specified the version to 2.6.3.

[alaxalves]

@yous do I use the same version as travis or do I update Travis to use 2.6.4 as well?

[jcserracampos]

@alaxalves Saying to access through localhost is incorrect, is not?
I am a macOS user and I only can access via docker-machine ip.

[alaxalves]

@alaxalves Saying to access through localhost is incorrect, is not?
I am a macOS user and I only can access via docker-machine ip.

I think that you have an specific use case. For what I'm aware of latest Docker CE doesn't use a VM to "simulate" a Docker environment on MacOS anymore, now it uses the host's kernel, as in linux systems. Thus you can access your containerized service through localhost.

[jcserracampos]

@alaxalves Saying to access through localhost is incorrect, is not?
I am a macOS user and I only can access via docker-machine ip.

I think that you have an specific use case. For what I'm aware of latest Docker CE doesn't use a VM to "simulate" a Docker environment on MacOS anymore, now it uses the host's kernel, as in linux systems. Thus you can access your containerized service through localhost.

I use kyperkit and can not use localhost.