eg3 finished and test proxy

eg3/README.md

@@ -22,7 +22,9 @@ In this section, we test frontend container can cross-communicate with backend c
 
 Steps:
 1. Comment out proxy container
-2. frontend has port 80 exposed; backend has port 5000 exposed;
+2. Remove exposed of both containers, as we they don't need expose their ports to outside environment. We just want to test their cross-communication in the same docker network
+   1. port 80 for frontend; 
+   2. port 5000 for backend;
 3. Run `docker compose build` & `docker compose up`
 4. Create a network: `docker network create mynetwork`
 5. Add containers into network
@@ -32,4 +34,24 @@ Steps:
 7. Test network:
    1. Enter frontend container: `docker exec -it frontend /bin/sh`
    2. Make a request to backend: `curl http://backend:5000`
-   3. Get response `{"version": "1.0.0"}`
+   3. Get response `{"version": "1.0.0"}`
+
+# Proxy using nginx
+
+In this section, we test we can reach both frontend and backend from proxy container or computer itself
+
+Steps:
+1. Uncomment all container in `docker-compose.yaml`
+2. Build container and initiate them via `docker compose up`
+3. These container are not in `mynetwork`
+4. Enter proxy container via `docker exec -it proxy /bin/sh`
+5. From the proxy container, try to reach other containers
+   1. Frontend
+      1. `curl http://frontend`
+      2. `curl http://localhost` to visit port 80
+   2. Backend
+      1. `curl http://backend:5000`
+      2. `curl http://localhost/api`
+6. Exit the container; In normal terminal, we can still reach frontend and backend
+   1. `curl http://localhost` to visit frontend
+   2. `curl http://localhost/api` to visit backend

eg3/docker-compose.yaml

@@ -1,29 +1,25 @@
 version: '3.8'
 
 services:
-  # proxy:
-  #   container_name: proxy
-  #   build:
-  #     context: ./proxy
-  #     dockerfile: Dockerfile
-  #   ports:
-  #     - "80:80"
-  #   depends_on:
-  #     - frontend
-  #     - backend
+  proxy:
+    container_name: proxy
+    build:
+      context: ./proxy
+      dockerfile: Dockerfile
+    ports:
+      - "80:80"
+    depends_on:
+      - frontend
+      - backend
 
   frontend:
     container_name: frontend
     build: 
       context: ./frontend
       dockerfile: Dockerfile
-    ports:
-      - "80:80" # Uncomment this line if you want to run the frontend container only
 
   backend:
     container_name: backend
     build:
       context: ./backend
-      dockerfile: Dockerfile
-    ports:
-      - "5000:5000" # Uncomment this line if you want to run the backend container only
+      dockerfile: Dockerfile