feat: divide the backend on 2 instances, run first instance on 3000port,...

feat: divide the backend on 2 instances, run first instance on 3000port, second one on 3001port, add loadbalancer

conf.d/nginx.conf

-server {
-  listen 3000;
-  location / {
-    proxy_pass http://backend:3000;
-  }
-}
\ No newline at end of file

docker-compose.yml

-version: '3'
+version: '3.2'
 
 services:
   frontend:
@@ -13,19 +13,31 @@ services:
     stdin_open: true
     tty: true
     depends_on:
-      - backend
+      - loadbalancer
     networks:
       - letsDo-network
 
-  backend:
+  backend1:
+    build:
+      context: server
+      dockerfile: Dockerfile
+    env_file:
+      - .env
+    restart: always
+    depends_on:
+      - database
+    environment:
+      - DB_USER
+      - DB_PASSWORD
+    networks:
+      - letsDo-network
+
+  backend2:
     build:
       context: server
       dockerfile: Dockerfile
     env_file:
       - .env
-    # container_name: node-server
-    # ports:
-    #   - '${BACKEND_PORT}:${BACKEND_PORT}'
     restart: always
     depends_on:
       - database
@@ -39,12 +51,13 @@ services:
     image: mongo
     container_name: mongo-db
 
-  nginx:
-    image: nginx:latest
-    volumes:
-      - ./conf.d:/etc/nginx/conf.d
-    depends_on:
-      - backend
+  loadbalancer:
+    build:
+      context: loadbalancer
+      dockerfile: Dockerfile
+    links:
+      - backend1
+      - backend2
     ports:
       - ${BACKEND_PORT}:${BACKEND_PORT}
     networks:

loadbalancer/Dockerfile

+FROM nginx
+
+COPY nginx.conf /etc/nginx/nginx.conf
+
+EXPOSE 3000
+
+CMD ["nginx", "-g", "daemon off;"]
\ No newline at end of file

loadbalancer/nginx.conf

+http {
+  upstream backend {
+    server backend1:3000;
+    server backend2:3001;
+  }
+
+  server {
+    listen 3000;
+
+    location / {
+      proxy_pass http://backend/;
+    }
+  }
+}
+
+events {}
\ No newline at end of file