What does this mean? "uninitialized constant Fog::Compute::Vsphere::Datastore"

[jsirianni]

I use a project that relies on FOG, I get this error:

uninitialized constant Fog::Compute::Vsphere::Datastore

This only happens when a another fog process is cloning a template.

I dont have much info, but if I knew what the error meant, maybe I could provide more context.

[timogoebel]

Basically, ruby is having issues looking up this constant. Can you provide a stack trace to figure out in which context this is happening?

[edergillian]

I have a similar problem when using Foreman 1.22.0. This happens sometimes when creating a host to be deployed on vCenter. It's not always reproducible; when it happens, a few refreshes on the web UI and it works again. Here's a partial log from Foreman:

2019-11-04T18:30:10 [I|app|d144ddb3] Started GET "/api/v2/compute_resources/1-vCenter/available_storage_domains?cluster_id=XXXX" for XXXXXXXXXX at 2019-11-04 18:30:10 -0300
2019-11-04T18:30:10 [I|app|d144ddb3] Processing by Api::V2::ComputeResourcesController#available_storage_domains as JSON
2019-11-04T18:30:10 [I|app|d144ddb3]   Parameters: {"cluster_id"=>"XXXX", "apiv"=>"v2", "id"=>"1-vCenter"}
2019-11-04T18:30:10 [I|app|d144ddb3] Current user set to XXXXXXXXXXXXX
2019-11-04T18:30:10 [W|app|d144ddb3] Action failed
 | NameError: uninitialized constant Fog::Vsphere::Compute::Datastore
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/inflector/methods.rb:285:in `const_get'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/inflector/methods.rb:285:in `block in constantize'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/inflector/methods.rb:281:in `each'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/inflector/methods.rb:281:in `inject'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/inflector/methods.rb:281:in `constantize'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/core_ext/string/inflections.rb:68:in `constantize'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/core_ext/marshal.rb:10:in `rescue in load'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/core_ext/marshal.rb:6:in `load'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/cache.rb:804:in `uncompress'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/cache.rb:726:in `value'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/cache.rb:358:in `block in read'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/cache.rb:663:in `block in instrument'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/notifications.rb:170:in `instrument'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/cache.rb:663:in `instrument'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/cache.rb:345:in `read'
 | /usr/share/foreman/app/services/compute_resource_cache.rb:34:in `read'
 | /usr/share/foreman/app/services/compute_resource_cache.rb:19:in `cache'
 | /usr/share/foreman/app/models/compute_resources/foreman/model/vmware.rb:114:in `datastores'
 | /usr/share/foreman/app/models/compute_resources/foreman/model/vmware.rb:188:in `available_storage_domains'
 | /usr/share/foreman/app/controllers/api/v2/compute_resources_controller.rb:169:in `available_storage_domains'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_controller/metal/basic_implicit_render.rb:6:in `send_action'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/abstract_controller/base.rb:194:in `process_action'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_controller/metal/rendering.rb:30:in `process_action'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/abstract_controller/callbacks.rb:42:in `block in process_action'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/callbacks.rb:109:in `block in run_callbacks'
 | /usr/share/foreman/app/controllers/api/v2/base_controller.rb:163:in `disable_json_root'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/callbacks.rb:118:in `block in run_callbacks'
 | /usr/share/foreman/app/controllers/concerns/foreman/controller/timezone.rb:10:in `set_timezone'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/callbacks.rb:118:in `block in run_callbacks'
 | /usr/share/foreman/app/models/concerns/foreman/thread_session.rb:32:in `clear_thread'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/callbacks.rb:118:in `block in run_callbacks'
 | /usr/share/foreman/app/controllers/concerns/foreman/controller/topbar_sweeper.rb:12:in `set_topbar_sweeper_controller'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/callbacks.rb:118:in `block in run_callbacks'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/audited-4.8.0/lib/audited/sweeper.rb:14:in `around'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/callbacks.rb:118:in `block in run_callbacks'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/audited-4.8.0/lib/audited/sweeper.rb:14:in `around'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/callbacks.rb:118:in `block in run_callbacks'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/callbacks.rb:136:in `run_callbacks'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/abstract_controller/callbacks.rb:41:in `process_action'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_controller/metal/rescue.rb:22:in `process_action'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_controller/metal/instrumentation.rb:34:in `block in process_action'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/notifications.rb:168:in `block in instrument'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/notifications/instrumenter.rb:23:in `instrument'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/notifications.rb:168:in `instrument'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_controller/metal/instrumentation.rb:32:in `process_action'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_controller/metal/params_wrapper.rb:256:in `process_action'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activerecord-5.2.1/lib/active_record/railties/controller_runtime.rb:24:in `process_action'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/abstract_controller/base.rb:134:in `process'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionview-5.2.1/lib/action_view/rendering.rb:32:in `process'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_controller/metal.rb:191:in `dispatch'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_controller/metal.rb:252:in `dispatch'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_dispatch/routing/route_set.rb:52:in `dispatch'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_dispatch/routing/route_set.rb:34:in `serve'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_dispatch/routing/mapper.rb:18:in `block in <class:Constraints>'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_dispatch/routing/mapper.rb:48:in `serve'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_dispatch/journey/router.rb:52:in `block in serve'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_dispatch/journey/router.rb:35:in `each'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_dispatch/journey/router.rb:35:in `serve'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_dispatch/routing/route_set.rb:840:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/apipie-rails-0.5.16/lib/apipie/static_dispatcher.rb:66:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/apipie-rails-0.5.16/lib/apipie/extractor/recorder.rb:137:in `call'
 | /usr/share/foreman/lib/foreman/middleware/telemetry.rb:10:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/apipie-rails-0.5.16/lib/apipie/middleware/checksum_in_headers.rb:27:in `call'
 | /usr/share/foreman/lib/foreman/middleware/catch_json_parse_errors.rb:9:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/rack-2.0.7/lib/rack/tempfile_reaper.rb:15:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/rack-2.0.7/lib/rack/etag.rb:25:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/rack-2.0.7/lib/rack/conditional_get.rb:25:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/rack-2.0.7/lib/rack/head.rb:12:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_dispatch/http/content_security_policy.rb:18:in `call'
 | /usr/share/foreman/lib/foreman/middleware/logging_context_session.rb:22:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/rack-2.0.7/lib/rack/session/abstract/id.rb:232:in `context'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/rack-2.0.7/lib/rack/session/abstract/id.rb:226:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_dispatch/middleware/cookies.rb:670:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/callbacks.rb:98:in `run_callbacks'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_dispatch/middleware/callbacks.rb:26:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_dispatch/middleware/debug_exceptions.rb:61:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_dispatch/middleware/show_exceptions.rb:33:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/railties-5.2.1/lib/rails/rack/logger.rb:38:in `call_app'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/railties-5.2.1/lib/rails/rack/logger.rb:28:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/quiet_assets.rb:13:in `call'
 | /usr/share/foreman/lib/foreman/middleware/logging_context_request.rb:11:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_dispatch/middleware/remote_ip.rb:81:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_dispatch/middleware/request_id.rb:27:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/rack-2.0.7/lib/rack/method_override.rb:22:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/rack-2.0.7/lib/rack/runtime.rb:22:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/activesupport-5.2.1/lib/active_support/cache/strategy/local_cache_middleware.rb:29:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_dispatch/middleware/executor.rb:14:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/actionpack-5.2.1/lib/action_dispatch/middleware/static.rb:127:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/rack-2.0.7/lib/rack/sendfile.rb:111:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/secure_headers-6.1.1/lib/secure_headers/middleware.rb:11:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/railties-5.2.1/lib/rails/engine.rb:524:in `call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/railties-5.2.1/lib/rails/railtie.rb:190:in `public_send'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/railties-5.2.1/lib/rails/railtie.rb:190:in `method_missing'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/rack-2.0.7/lib/rack/urlmap.rb:68:in `block in call'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/rack-2.0.7/lib/rack/urlmap.rb:53:in `each'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/rack-2.0.7/lib/rack/urlmap.rb:53:in `call'
 | /usr/lib/ruby/vendor_ruby/phusion_passenger/rack/thread_handler_extension.rb:97:in `process_request'
 | /usr/lib/ruby/vendor_ruby/phusion_passenger/request_handler/thread_handler.rb:152:in `accept_and_process_next_request'
 | /usr/lib/ruby/vendor_ruby/phusion_passenger/request_handler/thread_handler.rb:113:in `main_loop'
 | /usr/lib/ruby/vendor_ruby/phusion_passenger/request_handler.rb:416:in `block (3 levels) in start_threads'
 | /usr/lib/ruby/vendor_ruby/phusion_passenger/utils.rb:113:in `block in create_thread_and_abort_on_exception'
 | /usr/share/foreman/vendor/ruby/2.3.0/gems/logging-2.2.2/lib/logging/diagnostic_context.rb:474:in `block in create_with_logging_context'
2019-11-04T18:30:10 [I|app|d144ddb3]   Rendering api/v2/errors/standard_error.json.rabl within api/v2/layouts/error_layout
2019-11-04T18:30:10 [I|app|d144ddb3]   Rendered api/v2/errors/standard_error.json.rabl within api/v2/layouts/error_layout (1.2ms)
2019-11-04T18:30:10 [I|app|d144ddb3] Completed 500 Internal Server Error in 62ms (Views: 12.3ms | ActiveRecord: 6.8ms)

[ezr-ondrej]

@edergillian I believe there is something messed up with the cache in foreman, but I am not sure what. Could you try to disable the cache for that vCenter? ... also, it would be better if you could post it to the community.theforeman.org in support category as it is probably only foreman related.

[edergillian]

@edergillian I believe there is something messed up with the cache in foreman, but I am not sure what. Could you try to disable the cache for that vCenter? ... also, it would be better if you could post it to the community.theforeman.org in support category as it is probably only foreman related.

Thanks for the tip! I'll disable the cache and run some tests. It's gonna take a while to see some real results though, as it does not happen everytime.

I'll also make a post on the Foreman community.