所以在heroku上我遇到了这个问题。我不太明白为什么会这样。
heroku run rails c
> cache = Dalli::Client.new
> Rails.cache.write('memcachier', 'rocks')
Dalli::Server#connect localhost:11211
localhost:11211 failed (count: 1) Errno::ECONNREFUSED: Connection refused - send
localhost:11211 failed (count: 1) Errno::ECONNREFUSED: Connection refused - send
localhost:11211 is down
localhost:11211 is down