Sidekiq.configure_server do |config|
  config.redis = { :url => 'http://localhost:6379/12', :namespace => 'mynamespace' }
  config.server_middleware do |chain|
    chain.add Sidekiq::Status::ServerMiddleware # default
  end
  config.client_middleware do |chain|
    chain.add Sidekiq::Status::ClientMiddleware
  end
end

Sidekiq.configure_client do |config|
  config.redis = { :url => 'http://localhost:6379/12', :namespace => 'mynamespace' }
  config.client_middleware do |chain|
    chain.add Sidekiq::Status::ClientMiddleware
  end
end