Use Redis for the cache instead of memcached

CACHE_URL (default redis://redis:6379/1) feeds the built-in RedisCache
backend. Redis is already part of compose for Celery, so this drops
pylibmc, python-memcached and libmemcached-dev.

.env.docker

@@ -14,6 +14,7 @@ POSTGRES_HOST=db
 
 CELERY_BROKER_URL=redis://redis:6379/0
 CELERY_RESULT_BACKEND=redis://redis:6379/0
+CACHE_URL=redis://redis:6379/1
 
 # Host -> urlconf. Add the VPS IP / domain here if you access it that way.
 UNGLEICH_SITE_CONFIGS={"ungleich.ch":{"MULTISITE_CMS_URL":"dynamicweb.urls"},"blog.ungleich.ch":{"MULTISITE_CMS_URL":"dynamicweb.urls"},"comic.ungleich.ch":{"MULTISITE_CMS_URL":"dynamicweb.urls"},"digitalglarus.ch":{"MULTISITE_CMS_URL":"dynamicweb.urls"},"datacenterlight.ch":{"MULTISITE_CMS_URL":"dynamicweb.urls"},"rails-hosting.ch":{"MULTISITE_CMS_URL":"dynamicweb.urls"},"django-hosting.ch":{"MULTISITE_CMS_URL":"dynamicweb.urls"},"node-hosting.ch":{"MULTISITE_CMS_URL":"dynamicweb.urls"},"devuanhosting.ch":{"MULTISITE_CMS_URL":"dynamicweb.urls"},"devuanhosting.com":{"MULTISITE_CMS_URL":"dynamicweb.urls"},"ipv6onlyhosting.com":{"MULTISITE_CMS_URL":"dynamicweb.urls"},"digitalezukunft.ch":{"MULTISITE_CMS_URL":"dynamicweb.urls"},"hack4glarus.ch":{"MULTISITE_CMS_URL":"dynamicweb.urls"},"xn--nglarus-n2a.ch":{"MULTISITE_CMS_URL":"dynamicweb.urls"},"localhost:8000":{"MULTISITE_CMS_URL":"dynamicweb.urls"},"127.0.0.1:8000":{"MULTISITE_CMS_URL":"dynamicweb.urls"}}

Dockerfile

@@ -10,7 +10,6 @@ RUN apk add --update --no-cache \
     jpeg-dev \
     libxml2-dev \
     libxslt-dev \
-    libmemcached-dev \
     zlib-dev \
     libffi-dev \
     && rm -rf /var/cache/apk/*

dynamicweb/settings/base.py

@@ -393,8 +393,8 @@ CMS_PERMISSION = True
 
 CACHES = {
     'default': {
-        'BACKEND': 'django.core.cache.backends.memcached.PyLibMCCache',
-        'LOCATION': '127.0.0.1:11211',
+        'BACKEND': 'django.core.cache.backends.redis.RedisCache',
+        'LOCATION': env('CACHE_URL', 'redis://redis:6379/1'),
     }
 }
 

dynamicweb/settings/prod.py

@@ -7,13 +7,6 @@ DEBUG = False
 
 EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
 
-CACHES = {
-    'default': {
-        'BACKEND': 'django.core.cache.backends.memcached.PyLibMCCache',
-        'LOCATION': '127.0.0.1:11211',
-    }
-}
-
 # MANAGERS = ADMINS
 
 REGISTRATION_MESSAGE['message'] = REGISTRATION_MESSAGE['message'].format(host='digitalglarus.ch',

requirements.archlinux.txt

@@ -1,2 +1 @@
 base-devel
-libmemcached

requirements.debian.txt

@@ -17,8 +17,6 @@ liblcms2-dev
 liblzma-dev
 libmagickcore-dev
 libmagickwand-dev
-libmemcached
-libmemcached-dev
 libncurses-dev
 libpq-dev
 libreadline-dev

requirements.txt

@@ -95,11 +95,9 @@ pyasn1==0.6.4
 pycodestyle==2.15.0
 pycryptodome==3.24.0
 pyflakes==4.0.2
-pylibmc==1.6.3
 pyotp==2.10.0
 python-dateutil==2.9.0.post0
 python-dotenv==1.2.4
-python-memcached==1.62
 python-slugify==9.1.2
 pytz==2026.5
 rcssmin==1.2.2