Added oslo.cache, not 100% sure which is affected yet.
** Also affects: oslo.cache
Importance: Undecided
Status: New
** No longer affects: keystone
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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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