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[Gage Hugo <1883659@xxxxxxxxxxxxxxxxxx>]

Added keystonemiddleware

** Also affects: keystonemiddleware
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1883659

Title:
  keystonemiddleware connections to memcached from neutron-server grow
  beyond configured values

Status in keystonemiddleware:
  New
Status in oslo.cache:
  New

Bug description:
  Using: keystone-17.0.0, Ussuri
   
  I've noticed a very odd behaviour of keystone_authtoken with memcached and neutron-server. The connection count to memcached grows over time, ignoring the settings of memcache_pool_maxsize and memcache_pool_unused_timeout. The keystone_authtoken middleware configuration is as follows:

  [keystone_authtoken]
  www_authenticate_uri = http://keystone_vip:5000
  auth_url = http://keystone_vip:35357
  auth_type = password
  project_domain_id = default
  user_domain_id = default
  project_name = service
  username = neutron
  password = neutron_password_here
  cafile =
  memcache_security_strategy = ENCRYPT
  memcache_secret_key = secret_key_here
  memcached_servers = memcached_server_1:11211,memcached_server_2:11211,memcached_server_3:11211
  memcache_pool_maxsize = 100
  memcache_pool_unused_timeout = 600
  token_cache_time = 3600

  Commenting out memcached settings under [keystone_authtoken] and
  restarting neutron-server drops the connection count in memcached to
  normal levels, i.e. hundreds, rather than thousands when neutron-
  server is using memcached. Neutron team (slaweq) suggested this is a
  Keystone issue because quote: "Neutron is just using
  keystonemiddleware as one of the middlewares in the pipeline".

  Grafana memcached connection graphs: https://ibb.co/p3TCJqC AND
  https://ibb.co/nmmvvH4

  The drops in the graphs indicate the restart of the neutron-server, so
  not sure if this is something to be expected, or there is an issue
  with the configuration, or it's a bug?

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