sunspot solr with help of capistrano 3

deploy.rb

# Your other configuration i.e. github repo, branch, deploy_to etc
.........

namespace :deploy do
	# Your other configuration i.e. start/stop puma/passanger/any other application server
	......

	before :updated, :setup_solr_data_dir do
	    invoke 'solr:symlink'
	end

	.....
end

# Start Stop Reindex SolrDB
namespace :solr do
  %w[start stop].each do |command|
    desc "#{command} solr"
    task command do
      on roles(:app) do
        within current_path do
          with rails_env: fetch(:rails_env, 'production') do
            execute :bundle, "exec rake sunspot:solr:#{command}"
          end
        end
      end
    end
  end

  desc "restart solr"
  task :restart do
    invoke 'solr:stop'
    invoke 'solr:start'
  end

  after 'deploy:finished', 'solr:restart'

  desc "reindex the whole solr database"
  task :reindex do
  	# Uncomment below, if you want hard reset the indexes 
  	# ---> 
    # invoke 'solr:stop'
    # on roles(:app) do
    #   execute :rm, "-rf #{shared_path}/solr/default/*"
    # end
    # invoke 'solr:start' 
    # <---
    on roles(:app) do
      within current_path do
        with rails_env: fetch(:rails_env, 'production') do
          info "Reindexing Solr database"
          execute :bundle, 'exec', :rake, 'sunspot:solr:reindex'
        end
      end
    end
  end

  task :symlink do
    on roles(:app) do
      unless test "[ -d #{shared_path}/solr/default ]"
        execute :mv, "#{release_path}/solr/default #{shared_path}/solr"
      else
        execute :rm, "-rf #{release_path}/solr/default"
        execute "ln -s #{shared_path}/solr/default #{release_path}/solr/default"
      end
      unless test "[ -d #{release_path}/solr/pids ]"
        execute "ln -s #{shared_path}/solr/pids/ #{release_path}/solr/pids"
      end
    end
  end
end

sunspot.yml

production:
  solr:
    hostname: localhost
    port: 8983
    log_level: WARNING
    # path: /solr/production
    # read_timeout: 2
    # open_timeout: 0.5

staging:
  solr:
    hostname: localhost
    port: 8983
    log_level: WARNING
    # path: /solr/staging
    # read_timeout: 2
    # open_timeout: 0.5

development:
  solr:
    hostname: localhost
    port: 8982
    log_level: INFO
    path: /solr/development

test:
  solr:
    hostname: localhost
    port: 8981
    log_level: WARNING
    path: /solr/test