Use koschei's built-in memory limit

roles/koschei/backend/files/systemd-memory-limit.conf

@@ -1,2 +0,0 @@
-[Service]
-MemoryLimit=2G

roles/koschei/backend/tasks/main.yml

@@ -25,18 +25,6 @@
   - config
   - service
 
-- name: install systemd config files
-  copy: >
-    src=systemd-memory-limit.conf
-    dest=/etc/systemd/system/koschei-resolver.service.d/memory-limit.conf
-  notify:
-  - reload systemd
-  - restart koschei-resolver
-  tags:
-  - koschei
-  - config
-  - service
-
 - name: install config files
   template: >
     src="{{ item }}.j2"

roles/koschei/backend/templates/config-backend.cfg.j2

@@ -48,6 +48,9 @@ config = {
             "interval": 20*60, # in seconds
             {% endif %}
         },
+        "resolver": {
+            "memory_limit": 4 * 1024**3,
+        },
     },
     "logging": {
         "loggers": {