Add memcached as own service

fixes GeoNode#479

see GeoNode/geonode#8818

.env.sample

@@ -177,9 +177,13 @@ CACHE_BUSTING_STATIC_ENABLED=False
 
 MEMCACHED_ENABLED=False
 MEMCACHED_BACKEND=django.core.cache.backends.memcached.MemcachedCache
-MEMCACHED_LOCATION=127.0.0.1:11211
+MEMCACHED_LOCATION=memcached:11211
 MEMCACHED_LOCK_EXPIRE=3600
 MEMCACHED_LOCK_TIMEOUT=10
+#
+# Options for memcached binary, e.g. -vvv to log all requests and cache hits
+#
+MEMCACHED_OPTIONS=
 
 MAX_DOCUMENT_SIZE=200
 CLIENT_RESULTS_LIMIT=5
@@ -226,9 +230,9 @@ LDAP_GROUP_PROFILE_MEMBER_ATTR=uniqueMember
 
 # expressed in KB
 # CELERY__MAX_MEMORY_PER_CHILD="200000"
-# ## 
+# ##
 # Note right autoscale value must coincide with worker concurrency value
-# CELERY__AUTOSCALE_VALUES="15,10" 
+# CELERY__AUTOSCALE_VALUES="15,10"
 # CELERY__WORKER_CONCURRENCY="10"
 # ##
 # CELERY__OPTS="--without-gossip --without-mingle -Ofair -B -E"

docker-compose.yml

@@ -69,6 +69,19 @@ services:
       - statics:/mnt/volumes/statics
     restart: unless-stopped
 
+  # memcached service
+  memcached:
+    image: memcached:alpine
+    container_name: memcached4${COMPOSE_PROJECT_NAME}
+    command: memcached ${MEMCACHED_OPTIONS}
+    restart: on-failure
+    healthcheck:
+      test: nc -z 127.0.0.1 11211
+      interval: 30s
+      timeout: 30s
+      retries: 5
+      start_period: 30s
+
   # Gets and installs letsencrypt certificates
   letsencrypt:
     image: geonode/letsencrypt:latest

src/entrypoint.sh

@@ -14,9 +14,8 @@ invoke () {
     echo "$@ tasks done"
 }
 
-# Start cron && memcached services
+# Start cron service
 service cron restart
-service memcached restart
 
 echo $"\n\n\n"
 echo "-----------------------------------------------------"
@@ -70,6 +69,6 @@ echo "-----------------------------------------------------"
 echo "FINISHED DJANGO ENTRYPOINT --------------------------"
 echo "-----------------------------------------------------"
 
-# Run the CMD 
+# Run the CMD
 echo "got command $cmd"
 exec $cmd