Memcached plugin for Kuby.

The memcached plugin provides the ability to stand up arbitrary memcached instances. Behind the scenes it uses the excellent kubedb Kubernetes operator.

Add the kuby-memcached gem to your Gemfile, then add a memcached instance like this:

require 'kuby/memcached'

Kuby.define(:production) do
  kubernetes do

    add_plugin(:memcached) do
      instance(:my_rails_cache)
    end

  end
end

The kuby-memcached plugin allows a number of additional configuration options too:

Kuby.define(:production) do
  kubernetes do

    add_plugin(:memcached) do
      instance(:my_rails_cache) do
        # set the version of memcached you want to use
        version '1.5.4-v1'  # this is the default version

        # set the port memcached listen on and that you'll
        # use to connect to the instance
        port 11211  # this is the default port
      end
    end

  end
end

Get a list of the memcached versions your cluster supports by running:

bundle exec kuby -e production kubectl -- get memcachedversions

Memcached instances defined in your Kuby config respond to #hostname, #port, and #url methods to help point at them in your Rails configuration. The #url method returns a complete URL to the memcached instance, including the host and port.

In your Rails config (eg. config/environments/production.rb), point your cache store at your memcached instance like so:

Kuby.load!

url = Kuby.environment.kubernetes
  .plugin(:memcached)
  .instance(:my_rails_cache)
  .url

config.cache_store = :mem_cache_store, url

You can also use a memcached client like the Dalli gem directly:

require 'dalli'

url = Kuby.environment.kubernetes
  .plugin(:memcached)
  .instance(:my_rails_cache)
  .url

dc = Dalli::Client.new(url)
dc.set('abc', 123)
value = dc.get('abc')

Licensed under the MIT license. See LICENSE for details.

• Cameron C. Dutro: http://github.com/camertron