add size limit to redis

README.md

@@ -77,12 +77,16 @@ version: '3.8'
 services:
   redis:
     image: redis:7-alpine
+    # Set a size limit. See link below on how to customise.
+    # https://redis.io/docs/manual/eviction/
+    command: redis-server --maxmemory 1gb --maxmemory-policy allkeys-lru
 
   app:
     image: cupcakearmy/cryptgeon:latest
     depends_on:
       - redis
     environment:
+      # Size limit for a single note.
       SIZE_LIMIT: 4 MiB
     ports:
       - 80:5000