docker swarm deploy settings for separate DB node

docker-compose.yml

@@ -6,6 +6,9 @@ services:
     deploy:
       mode: replicated
       replicas: 4
+      placement:
+        constraints:
+          - "node.labels.type==web"
     restart: always
     ports:
       - 443:443
@@ -39,6 +42,9 @@ services:
     deploy:
       mode: replicated
       replicas: 34
+      placement:
+        constraints:
+          - "node.labels.type==web"
     restart: always
     env_file: '.env'
     environment:
@@ -52,6 +58,12 @@ services:
 
   mongodb:
     image: mongo:4.2
+    deploy:
+      mode: replicated
+      replicas: 1
+      placement:
+        constraints:
+          - "node.labels.type==database"
     restart: always
     volumes:
       - mongo-data:/data/db