Limit Redis memory usage to 25% of system RAM

docker-compose.yml

@@ -121,15 +121,18 @@ services:
       test: redis-cli ping | grep PONG
     volumes:
       - "sentry-redis:/data"
-      - type: bind
-        read_only: true
-        source: ./redis.conf
-        target: /usr/local/etc/redis/redis.conf
     ulimits:
       nofile:
         soft: 10032
         hard: 10032
-    command: ["redis-server", "/usr/local/etc/redis/redis.conf"]
+    # Configure Redis to use only 1/4 of the available memory inside the container
+    # We compute total memory from /proc/meminfo and pass it to redis-server as maxmemory
+    command:
+      - sh
+      - -c
+      - >
+        MAXMEM=$(awk '/MemTotal/ {printf "%d", $2*1024/4}' /proc/meminfo);
+        exec redis-server --maxmemory $$MAXMEM --maxmemory-policy volatile-lru
   postgres:
     <<: *restart_policy
     # Using the same postgres version as Sentry dev for consistency purposes