这是我的错误：
<Thread:0x00007fde3dc23378@/.rvm/gems/ruby-2.5.1/gems/actioncable-5.2.3/lib/action_cable/subscription_adapter/redis.rb:148 run> terminated with exception (report_on_exception is true):
Traceback (most recent call last):
26: from /.rvm/gems/ruby-2.5.1/gems/actioncable-5.2.3/lib/action_cable/subscription_adapter/redis.rb:152:in `block in ensure_listener_running'
25: from /.rvm/gems/ruby-2.5.1/gems/actioncable-5.2.3/lib/action_cable/subscription_adapter/redis.rb:78:in `listen'
24: from /.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis.rb:70:in `without_reconnect'
23: from /.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis.rb:63:in `with_reconnect'
22: from /.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis.rb:58:in `synchronize'
21: from /.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/monitor.rb:226:in `mon_synchronize'
20: from /.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis.rb:58:in `block in synchronize'
19: from /.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis.rb:64:in `block in with_reconnect'
18: from /.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis/client.rb:293:in `with_reconnect'
17: from /.rvm/gems/ruby-2.5.1/gems/actioncable-5.2.3/lib/action_cable/subscription_adapter/redis.rb:81:in `block in listen'
16: from /.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis.rb:2142:in `subscribe'
15: from /.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis.rb:58:in `synchronize'
14: from /.rvm/rubies/ruby-2.5.1/lib/ruby/2.5.0/monitor.rb:226:in `mon_synchronize'
13: from /.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis.rb:58:in `block in synchronize'
12: from /.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis.rb:2143:in `block in subscribe'
11: from /.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis.rb:2775:in `_subscription'
10: from /.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis/subscribe.rb:12:in `subscribe'
9: from /.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis/subscribe.rb:43:in `subscription'
8: from /.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis/client.rb:133:in `call_loop'
7: from /.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis/client.rb:276:in `with_socket_timeout'
6: from /.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis/client.rb:100:in `connect'
5: from /.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis/client.rb:293:in `with_reconnect'
4: from /.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis/client.rb:101:in `block in connect'
3: from /.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis/client.rb:336:in `establish_connection'
2: from /.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis/connection/ruby.rb:313:in `connect'
1: from /.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis/connection/ruby.rb:229:in `connect'
/.rvm/gems/ruby-2.5.1/gems/redis-3.3.5/lib/redis/connection/ruby.rb:229:in **`getaddrinfo': getaddrinfo: nodename nor servname provided, or not known (SocketError)**
Exiting
我尝试过https://medium.com/rubyinside/action-cable-hello-world-with-rails-5-1-efc475b0208b