ERROR: Phusion Passenger doesn't seem to be running. If you are sure that it is running, then the causes of this problem could be:
1. You customized the instance registry directory using Apache's PassengerInstanceRegistryDir option, Nginx's passenger_instance_registry_dir option, or Phusion Passenger Standalone's --instance-registry-dir command line argument. If so, please set the environment variable PASSENGER_INSTANCE_REGISTRY_DIR to that directory and run passenger-status again.
2. The instance directory has been removed by an operating system background service. Please set a different instance registry directory using Apache's PassengerInstanceRegistryDir option, Nginx's passenger_instance_registry_dir option, or Phusion Passenger Standalone's --instance-registry-dir command line argument.
Specifies the directory that Passenger should use for registering its current instance.
When Passenger starts up, it creates a temporary directory inside the instance registry directory. This temporary directory is called the instance directory. It contains all sorts of files that are important to that specific running Passenger instance, such as Unix domain socket files so that all the different Passenger processes can communicate with each other. Command line tools such as passenger-status use the files in this directory in order to query Passenger’s status.
/usr/local/rvm/gems/ruby-2.3.7/gems/passenger-5.3.7/src/ruby_supportlib/phusion_passenger/admin_tools/instance.rb:94:in `initialize': too long unix socket path (115bytes given but 108bytes max) (ArgumentError)
from /usr/local/rvm/gems/ruby-2.3.7/gems/passenger-5.3.7/src/ruby_supportlib/phusion_passenger/admin_tools/instance.rb:94:in `new'
from /usr/local/rvm/gems/ruby-2.3.7/gems/passenger-5.3.7/src/ruby_supportlib/phusion_passenger/admin_tools/instance.rb:94:in `http_request'
from /usr/local/rvm/gems/ruby-2.3.7/gems/passenger-5.3.7/bin/passenger-status:113:in `show_status'
from /usr/local/rvm/gems/ruby-2.3.7/gems/passenger-5.3.7/bin/passenger-status:61:in `command_show_status'
from /usr/local/rvm/gems/ruby-2.3.7/gems/passenger-5.3.7/bin/passenger-status:332:in `start'
from /usr/local/rvm/gems/ruby-2.3.7/gems/passenger-5.3.7/bin/passenger-status:335:in `<top (required)>'
from /usr/local/rvm/gems/ruby-2.3.7/bin/passenger-status:23:in `load'
from /usr/local/rvm/gems/ruby-2.3.7/bin/passenger-status:23:in `<main>'
from /usr/local/rvm/gems/ruby-2.3.7/bin/ruby_executable_hooks:24:in `eval'
from /usr/local/rvm/gems/ruby-2.3.7/bin/ruby_executable_hooks:24:in `<main>'