Caching in Horizon with Redis

Redis is a in-memory data structure store, which can be used as cache and session backend.

I thought to give it a try for Horizon. Installation is quite simple, either pip install django-redis or dnf --enablerepo=rawhide install python-django-redis.

Then change openstack_dashboard/local/ aka. /etc/openstack-dashboard/local_settings to incorporate

    "default": {
        "BACKEND": "django_redis.cache.RedisCache",
        "LOCATION": "redis://",
        "OPTIONS": {
            "CLIENT_CLASS": "django_redis.client.DefaultClient",

Make sure you also have something like

SESSION_ENGINE = "django.contrib.sessions.backends.cache"

Finally, start your redis and restart httpd:

systemctl start redis
systemctl restart httpd

Voilà, now your Horizon should use Redis for caching.