I hope someone can help me with a problem that I am certain is a user error.
The configuration details below work in all my other environments including integration, development and qa. However, the production servers give the following error:
<ActionController::Session::MemCacheStore:0x2b45f6acb248> unable to find server during initialization.
When I telnet to the memcached box from the server having the problem and run 'stats', I get:
STAT pid 16136
STAT uptime 7398638
STAT time 1275059978
STAT version 1.2.8
STAT pointer_size 64
STAT rusage_user 7.085922
STAT rusage_system 13.275981
STAT curr_items 10878
STAT total_items 11441
STAT bytes 2020180
STAT curr_connections 5
STAT total_connections 306
STAT connection_structures 11
STAT cmd_flush 0
STAT cmd_get 457326
STAT cmd_set 11441
STAT get_hits 412184
STAT get_misses 45142
STAT evictions 0
STAT bytes_read 22600329
STAT bytes_written 53036649
STAT limit_maxbytes 30064771072
STAT threads 5
STAT accepting_conns 1
STAT listen_disabled_num 0
Below are the configuration details and stacktrace.
config/environment.rb (the important parts):
config.action_controller.session_store = :mem_cache_store
config.gem "memcache-client", :lib => 'memcache'
config/environments/production.rb:
config.cache_store = :mem_cache_store
require 'memcache'
# Caching
# Memcached configuration
memcache_options = {
:c_threshold => 100_000,
:compression => true,
:debug => false,
:namespace => 'gucci',
:readonly => false,
:urlencode => false,
:multithread => true
}
CACHE = MemCache.new memcache_options
CACHE.servers = ['10.x.x.x:11211']
Stacktrace:
/var/www/oro/production/releases/20100528130253/vendor/rails/actionpack/lib/action_controller/session/mem_cache_store.rb 20 in `initialize'
1 /var/www/oro/production/releases/20100528130253/vendor/rails/actionpack/lib/action_controller/middleware_stack.rb 72 in `new'
2 /var/www/oro/production/releases/20100528130253/vendor/rails/actionpack/lib/action_controller/middleware_stack.rb 72 in `build'
3 /var/www/oro/production/releases/20100528130253/vendor/rails/actionpack/lib/action_controller/middleware_stack.rb 116 in `build'
4 /var/www/oro/production/releases/20100528130253/vendor/rails/activesupport/lib/active_support/inflector.rb 361 in `inject'
5 /var/www/oro/production/releases/20100528130253/vendor/rails/actionpack/lib/action_controller/middleware_stack.rb 116 in `each'
6 /var/www/oro/production/releases/20100528130253/vendor/rails/actionpack/lib/action_controller/middleware_stack.rb 116 in `inject'
7 /var/www/oro/production/releases/20100528130253/vendor/rails/actionpack/lib/action_controller/middleware_stack.rb 116 in `build'
8 /var/www/oro/production/releases/20100528130253/vendor/rails/actionpack/lib/action_controller/dispatcher.rb 130 in `build_middleware_stack'
9 /var/www/oro/production/releases/20100528130253/vendor/rails/actionpack/lib/action_controller/dispatcher.rb 81 in `initialize'
10 /var/www/oro/production/releases/20100528130253/vendor/rails/actionpack/lib/action_controller/dispatcher.rb 51 in `new'
11 /var/www/oro/production/releases/20100528130253/vendor/rails/actionpack/lib/action_controller/dispatcher.rb 51 in `run_prepare_callbacks'
12 /var/www/oro/production/releases/20100528130253/vendor/rails/railties/lib/initializer.rb 631 in `prepare_dispatcher'
13 /var/www/oro/production/releases/20100528130253/vendor/rails/railties/lib/initializer.rb 185 in `process'
14 /var/www/oro/production/releases/20100528130253/vendor/rails/railties/lib/initializer.rb 113 in `send'
15 /var/www/oro/production/releases/20100528130253/vendor/rails/railties/lib/initializer.rb 113 in `run'
16 /var/www/oro/production/releases/20100528130253/config/environment.rb 29
17 /usr/local//lib/ruby/site_ruby/1.8/rubygems/custom_require.rb 31 in `gem_original_require'
18 /usr/local//lib/ruby/site_ruby/1.8/rubygems/custom_require.rb 31 in `require'
19 /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.10/lib/phusion_passenger/railz/application_spawner.rb 303 in `preload_application'
20 /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.10/lib/phusion_passenger/railz/application_spawner.rb 252 in `initialize_server'
21 /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.10/lib/phusion_passenger/utils.rb 255 in `report_app_init_status'
22 /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.10/lib/phusion_passenger/railz/application_spawner.rb 237 in `initialize_server'
23 /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.10/lib/phusion_passenger/abstract_server.rb 194 in `start_synchronously'
24 /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.10/lib/phusion_passenger/abstract_server.rb 163 in `start'
25 /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.10/lib/phusion_passenger/railz/application_spawner.rb 213 in `start'
26 /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.10/lib/phusion_passenger/spawn_manager.rb 262 in `spawn_rails_application'
27 /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.10/lib/phusion_passenger/abstract_server_collection.rb 126 in `lookup_or_add'
28 /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.10/lib/phusion_passenger/spawn_manager.rb 256 in `spawn_rails_application'
29 /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.10/lib/phusion_passenger/abstract_server_collection.rb 80 in `synchronize'
30 /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.10/lib/phusion_passenger/abstract_server_collection.rb 79 in `synchronize'
31 /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.10/lib/phusion_passenger/spawn_manager.rb 255 in `spawn_rails_application'
32 /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.10/lib/phusion_passenger/spawn_manager.rb 154 in `spawn_application'
33 /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.10/lib/phusion_passenger/spawn_manager.rb 287 in `handle_spawn_application'
34 /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.10/lib/phusion_passenger/abstract_server.rb 352 in `__send__'
35 /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.10/lib/phusion_passenger/abstract_server.rb 352 in `main_loop'
36 /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.10/lib/phusion_passenger/abstract_server.rb 196 in `start_synchronously'
37 /usr/local/lib/ruby/gems/1.8/gems/passenger-2.2.10/bin/passenger-spawn-server 61
For me it turned out, that my memcache daemon did not listen to 127.0.0.1 but to localhost. After removing the -l localhost option from the init file it worked perfectly. (Default is to listen on all devices.)
I had some similar issues with the memcached gem and switched to dali. Development on dali seems more active and it is significantly faster. I followed the directions on the github page and had dali up and running in about ten minutes.
Just making sure, but I don't see where you're setting the session config to your CACHE constant:
config.action_controller.session = {
:session_key => '_appname',
:secret => 'secret',
:cache => CACHE,
:expires => 10
}
This might work for qa/dev/testing since I think by default rails looks for the memcached store on localhost. Whereas on production you seem to have a different ip for the memcached server.
In the stacktrace there's 3 lines:
/var/www/oro/production/releases/20100528130253/config/environment.rb 29
/usr/local//lib/ruby/site_ruby/1.8/rubygems/custom_require.rb 31 in `gem_original_require'
/usr/local//lib/ruby/site_ruby/1.8/rubygems/custom_require.rb 31 in `require'
It seems to be some gem missing, please review the environment.rb on line 29
did you try?:
sudo gem install memcached
It's memcached running?
sudo /etc/init.d/memcached start
来源：https://stackoverflow.com/questions/2930249/rails-passenger-and-memcached-unable-to-find-server-during-initialization