Redis 尝试连接到 Heroku 上的 localhost 而不是 REDIS_URL答案

【问题标题】：Redis tries to connect to localhost on Heroku instead of REDIS_URLRedis 尝试连接到 Heroku 上的 localhost 而不是 REDIS_URL
【发布时间】：2017-07-12 07:45:44
【问题描述】：

我有一个使用 Redis 进行后台作业的 Rails 应用程序。在 Heroku 上，我使用 Heroku Redis 插件。当我部署到 Heroku 时，它给了我这个错误：

Redis::CannotConnectError: Error connecting to Redis on 127.0.0.1:6379

它似乎试图连接到本地主机。我在 Heroku 上有一个 REDIS_URL 和 REDIS_PROVIDER 环境变量。这就是我的redis.rb 的样子：

if Rails.env.production?
  uri = URI.parse(ENV["REDIS_URL"])
else
  uri = URI.parse("redis://localhost:6379")
end
Resque.redis = Redis.new(:host => uri.host, :port => uri.port, :password => uri.password)

这是我的Procfile：

web: bundle exec unicorn -p $PORT -c ./config/unicorn.rb
worker: env TERM_CHILD=1 bundle exec rake environment resque:work QUEUE=* COUNT=1

任何想法为什么它不起作用？即使我将redis.rb 更改为只有REDIS_URL 作为url，它也会给出相同的错误。

更新：添加错误跟踪：

remote:        Redis::CannotConnectError: Error connecting to Redis on 127.0.0.1:6379 (Errno::ECONNREFUSED)
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:345:in `rescue in establish_connection'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:331:in `establish_connection'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:101:in `block in connect'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:293:in `with_reconnect'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:100:in `connect'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:364:in `ensure_connected'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:221:in `block in process'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:306:in `logging'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:220:in `process'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:120:in `call'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis.rb:351:in `block in time'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis.rb:58:in `block in synchronize'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis.rb:58:in `synchronize'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis.rb:350:in `time'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-namespace-1.5.3/lib/redis/namespace.rb:435:in `call_with_namespace'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-namespace-1.5.3/lib/redis/namespace.rb:321:in `method_missing'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/resque-1.27.2/lib/resque/data_store.rb:100:in `redis_time_available?'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/resque-1.27.2/lib/resque/data_store.rb:15:in `initialize'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/resque-1.27.2/lib/resque.rb:125:in `new'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/resque-1.27.2/lib/resque.rb:125:in `redis='
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/resque-web-0.0.9/config/initializers/resque_config.rb:4:in `<top (required)>'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:287:in `load'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:287:in `block in load'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:287:in `load'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/engine.rb:648:in `block in load_config_initializer'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/notifications.rb:166:in `instrument'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/engine.rb:647:in `load_config_initializer'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/engine.rb:612:in `block (2 levels) in <class:Engine>'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/engine.rb:611:in `each'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/engine.rb:611:in `block in <class:Engine>'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/initializable.rb:30:in `instance_exec'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/initializable.rb:30:in `run'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/initializable.rb:55:in `block in run_initializers'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/initializable.rb:44:in `each'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/initializable.rb:44:in `tsort_each_child'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/initializable.rb:54:in `run_initializers'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/application.rb:352:in `initialize!'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/config/environment.rb:5:in `<top (required)>'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `require'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `block in require'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `require'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/application.rb:328:in `require_environment!'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/application.rb:448:in `block in run_tasks_blocks'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/task.rb:62:in `block (2 levels) in define'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/rake-12.0.0/exe/rake:27:in `<top (required)>'
remote:        Errno::ECONNREFUSED: Connection refused - connect(2) for 127.0.0.1:6379
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/connection/ruby.rb:206:in `rescue in connect_addrinfo'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/connection/ruby.rb:198:in `connect_addrinfo'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/connection/ruby.rb:239:in `block in connect'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/connection/ruby.rb:237:in `each'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/connection/ruby.rb:237:in `each_with_index'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/connection/ruby.rb:237:in `connect'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/connection/ruby.rb:313:in `connect'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:336:in `establish_connection'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:101:in `block in connect'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:293:in `with_reconnect'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:100:in `connect'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:364:in `ensure_connected'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:221:in `block in process'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:306:in `logging'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:220:in `process'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:120:in `call'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis.rb:351:in `block in time'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis.rb:58:in `block in synchronize'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis.rb:58:in `synchronize'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis.rb:350:in `time'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-namespace-1.5.3/lib/redis/namespace.rb:435:in `call_with_namespace'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-namespace-1.5.3/lib/redis/namespace.rb:321:in `method_missing'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/resque-1.27.2/lib/resque/data_store.rb:100:in `redis_time_available?'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/resque-1.27.2/lib/resque/data_store.rb:15:in `initialize'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/resque-1.27.2/lib/resque.rb:125:in `new'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/resque-1.27.2/lib/resque.rb:125:in `redis='
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/resque-web-0.0.9/config/initializers/resque_config.rb:4:in `<top (required)>'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:287:in `load'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:287:in `block in load'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:287:in `load'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/engine.rb:648:in `block in load_config_initializer'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/notifications.rb:166:in `instrument'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/engine.rb:647:in `load_config_initializer'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/engine.rb:612:in `block (2 levels) in <class:Engine>'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/engine.rb:611:in `each'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/engine.rb:611:in `block in <class:Engine>'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/initializable.rb:30:in `instance_exec'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/initializable.rb:30:in `run'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/initializable.rb:55:in `block in run_initializers'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/initializable.rb:44:in `each'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/initializable.rb:44:in `tsort_each_child'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/initializable.rb:54:in `run_initializers'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/application.rb:352:in `initialize!'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/config/environment.rb:5:in `<top (required)>'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `require'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `block in require'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `require'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/application.rb:328:in `require_environment!'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/application.rb:448:in `block in run_tasks_blocks'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/task.rb:62:in `block (2 levels) in define'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/rake-12.0.0/exe/rake:27:in `<top (required)>'
remote:        IO::EINPROGRESSWaitWritable: Operation now in progress - connect(2) would block
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/connection/ruby.rb:199:in `connect_addrinfo'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/connection/ruby.rb:239:in `block in connect'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/connection/ruby.rb:237:in `each'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/connection/ruby.rb:237:in `each_with_index'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/connection/ruby.rb:237:in `connect'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/connection/ruby.rb:313:in `connect'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:336:in `establish_connection'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:101:in `block in connect'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:293:in `with_reconnect'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:100:in `connect'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:364:in `ensure_connected'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:221:in `block in process'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:306:in `logging'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:220:in `process'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis/client.rb:120:in `call'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis.rb:351:in `block in time'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis.rb:58:in `block in synchronize'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis.rb:58:in `synchronize'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-3.3.3/lib/redis.rb:350:in `time'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-namespace-1.5.3/lib/redis/namespace.rb:435:in `call_with_namespace'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/redis-namespace-1.5.3/lib/redis/namespace.rb:321:in `method_missing'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/resque-1.27.2/lib/resque/data_store.rb:100:in `redis_time_available?'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/resque-1.27.2/lib/resque/data_store.rb:15:in `initialize'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/resque-1.27.2/lib/resque.rb:125:in `new'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/resque-1.27.2/lib/resque.rb:125:in `redis='
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/resque-web-0.0.9/config/initializers/resque_config.rb:4:in `<top (required)>'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:287:in `load'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:287:in `block in load'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:287:in `load'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/engine.rb:648:in `block in load_config_initializer'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/notifications.rb:166:in `instrument'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/engine.rb:647:in `load_config_initializer'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/engine.rb:612:in `block (2 levels) in <class:Engine>'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/engine.rb:611:in `each'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/engine.rb:611:in `block in <class:Engine>'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/initializable.rb:30:in `instance_exec'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/initializable.rb:30:in `run'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/initializable.rb:55:in `block in run_initializers'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/initializable.rb:44:in `each'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/initializable.rb:44:in `tsort_each_child'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/initializable.rb:54:in `run_initializers'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/application.rb:352:in `initialize!'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/config/environment.rb:5:in `<top (required)>'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `require'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `block in require'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `require'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/application.rb:328:in `require_environment!'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/railties-5.0.1/lib/rails/application.rb:448:in `block in run_tasks_blocks'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/task.rb:62:in `block (2 levels) in define'
remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/rake-12.0.0/exe/rake:27:in `<top (required)>'
remote:        Tasks: TOP => environment
remote:        (See full trace by running task with --trace)
remote:  !
remote:  !     Precompiling assets failed.
remote:  !     Attempted to access a nonexistent database:
remote:  !     https://devcenter.heroku.com/articles/pre-provision-database
remote:  !
remote:  !     Push rejected, failed to compile Ruby app.
remote: 
remote:  !     Push failed
remote: Verifying deploy....
remote: 
remote: !   Push rejected to backbone-app-staging.
remote: 
To git@heroku.com:backbone-app-staging.git
 ! [remote rejected] rails5 -> master (pre-receive hook declined)
error: failed to push some refs to 'git@heroku.com:backbone-app-staging.git'

【问题讨论】：

当您运行heroku config 时，RAILS_ENV 被设置为什么？
那个不见了，但是在添加了那个环境变量之后，不幸的是它仍然返回同样的错误。愚蠢的是，我在 Heroku 上有另一个 Rails 应用程序，它的设置完全相同……
@John 你真的需要解析 url 吗？根据文档redis可以接收url参数作为配置选项：Redis.new(url: ENV["REDIS_URL"])
@31piy Rails.env 返回production
我很想知道如果你把评估从图片中去掉会发生什么。不要检查 Rails.env.production。始终连接到 ENV["REDIS_URL"]

标签： ruby-on-rails heroku redis

【解决方案1】：

我能想到两种可能：

在初始化程序运行之前是否设置了ENV['REDIS_URL']？例如，也许你有一个 .env 文件检入到 git 中，它覆盖了 Heroku 变量？
你说这个代码来自redis.rb。你也有config/initializers/resque.rb 吗？ config/resque.yml 呢？其中任何一个都可能也试图打开 Redis 连接。（如果您可以发布错误的整个堆栈跟踪，您可以确认或排除它。）或者您是否将 Redis 用于 Resque 以外的任何东西？

您还可以进行一些 printf 调试并将初始化程序更改为：

if Rails.env.production?
  puts "production: #{ENV['REDIS_URL']}"
  uri = URI.parse(ENV["REDIS_URL"])
else
  puts "not production"
  uri = URI.parse("redis://localhost:6379")
end

这应该可以帮助您弄清楚发生了什么。（您可能需要使用Rails.logger.info 而不是puts。）

编辑：该堆栈跟踪非常有用！果然，你自己的初始化器根本不在那里，但是还有其他代码试图加载自己的redis连接，这里：

remote:        /tmp/build_329306a238b046dda86a54d29db48f4c/vendor/bundle/ruby/2.4.0/gems/resque-web-0.0.9/config/initializers/resque_config.rb:4:in `<top (required)>'

如果你look up that gem，你可以看到它正在这样做：

require 'resque'

config = ENV.fetch("RAILS_RESQUE_REDIS", "127.0.0.1:6379")
Resque.redis = config

所以我认为答案是将RAILS_RESQUE_REDIS 另外设置为REDIS_URL。您可以使用 Heroku config:set 命令来执行此操作。

【讨论】：

您好，感谢您的建议，我已添加错误跟踪。没有config/initializers/resque.rb，也没有config/resque.yml，只有config/initializers/redis.rb。
您，先生，是救生员！我遇到了完全相同的问题，设置RAILS_RESQUE_REDIS 为我解决了这个问题，但有人需要向heroku 提出这个问题。这似乎是最近才出现的错误。

【解决方案2】：

您忘记将 USERNAME 传递给连接器，并且您的 REDIS_URL 可能已被服务提供商更改...

我推荐使用

$redis = if Rails.env.production? ? Redis.new(ENV["REDIS_URL"]) : Redis.new("redis://localhost:6379")

最好使用您的服务提供商设置的环境变量，例如ENV['REDISCLOUD_URL']，因为如果他们出于任何动机更改 url，例如当您更新计划或他们需要更改他们的基础设施时......他们可以只需设置他们的变量，它对您来说是透明的，不会中断服务。

如果您自己维护REDIS_URL，并且他们更改了他们的网址，您的应用将无法访问，直到您确定该网址应该更改并再次设置更新REDIS_URL

OBS

如果问题是在设置 worker 时......问题甚至可能是它没有从正确的环境开始，至少如果你在 Rails 5 上运行它，你应该将你的 resque Rakefile 配置为

#If you're using Rails 5.x, include the following in lib/tasks/resque.rb:

require 'resque/tasks'
task 'resque:setup' => :environment

【讨论】：

我正在使用 Heroku Redis，他们的环境变量是ENV["REDIS_URL"]，所以应该没问题。我进行了更改，但仍然返回相同的错误。
你能粘贴那个错误产生的跟踪吗？你确定这个脚本正在运行吗？如果您在此脚本的开头放置 Rails.logger.info "TRY TO CONFIG THINGS"，该文本会显示在日志中吗？

【解决方案3】：

在您的config/initializes/set_redis_url.rb 内部

ENV['REDIS_URL'] = ENV["REDISCLOUD_URL"] if ENV["REDISCLOUD_URL"]

在我过去，我使用 action cable 来处理 redis，如果没有 config/environments/production.rb 中的这些行，我的应用程序将无法运行

config.action_cable.allowed_request_origins = ['https://your-app.herokuapp.com',
                                           'http://your-app.herokuapp.com']

config.action_cable.url = "wss://sitepoint-custom-messaging.herokuapp.com/cable"

【讨论】：

【解决方案4】：

您需要在 Heroku 上添加 Redis to go 插件

替换这一行。 URI.parse("redis://localhost:6379") 与

您从设置中的 REDISTOGO_URL 和 heroku 上的 Config Vars 获得 Redis 链接

URI.parse("redis://redistogo:72adffd1a5bf8ffdffddfdafdfdfdaferjaw.redistogo.com:10289")

对于 Rails 6 ~> 你会这样做

  url: <%= ENV.fetch("REDIS_URL") { "redis://redistogo:72adffd1a5bf8fe74a2c05fdfdafdfreefdfaderjaw.redistogo.com:12317/" } %>

这些是虚拟链接

【讨论】：