Modify default memcached MAXCONN parameter when deploying the Overcloud

Issue

• We encountered some issues regarding the number of maximum openned connection in the memcached service/container.

• To solve that issue, we modified the /var/lib/config-data/puppet-generated/memcached/etc/sysconfig/memcached file on the controller nodes :

MAXCONN = 8192  ---> 20480

and the restart the container:

sudo podman restart memcached

• We think it will better to be able to modify the MAXCONN parameter inside the Overcloud deployment templates than modifying memcached configuration file ourselves, but we can't find any parameter.

• After some times, we can't connect to Horizon dashboard, and we have an authentication error when we use the openstack commands.