Add scaled FastAPI instances and Nginx load balancer

Author: Chetan3500

docker-compose.yml

@@ -1,19 +1,28 @@
+
 services:
   fastapi:
     build: .
     image: fastapi-app
-    ports:
-      - "8000:80"
     networks:
       - app-network
+    deploy:
+      replicas: 3
   prometheus:
     image: prom/prometheus:latest
     ports:
-      - "9091:9090"
+      - "9090:9090"
     volumes:
       - ./prometheus.yml:/etc/prometheus/prometheus.yml
     networks:
       - app-network
+  nginx:
+    image: nginx:latest
+    ports:
+      - "80:80"
+    volumes:
+      - ./nginx.conf:/etc/nginx/nginx.conf
+    networks:
+      - app-network
 
 networks:
   app-network:

nginx.conf

@@ -0,0 +1,14 @@
+events {}
+http {
+    upstream fastapi_backend {
+        server fastapi:80;
+    }
+    server {
+        listen 80;
+        location / {
+            proxy_pass http://fastapi_backend;
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+        }
+    }
+}

nginx_screenshot.png

@@ -3,5 +3,4 @@ global:
 scrape_configs:
   - job_name: "fastapi"
     static_configs:
-      - targets:
-          - "fastapi:80"
+      - targets: ['fastapi:80']

prometheus.yml

@@ -0,0 +1 @@
+{"message":"Welcome to my DevOps API!"}

scale_fastapi_8000.txt

@@ -0,0 +1 @@
+{"message":"Welcome to my DevOps API!"}

scale_fastapi_8001.txt

@@ -0,0 +1 @@
+{"message":"Welcome to my DevOps API!"}

scale_fastapi_8002.txt

@@ -0,0 +1 @@
+{"message":"Welcome to my DevOps API!"}

scale_nginx_fastapi.txt

@@ -0,0 +1 @@
+{"status":"healthy"}

scale_nginx_health.txt

@@ -0,0 +1 @@
+{"status":"success","data":{"resultType":"vector","result":[{"metric":{"__name__":"up","instance":"fastapi:80","job":"fastapi"},"value":[1756639953.723,"1"]}]}}