add load balancing config example

dolugen · Nov 22, 2020 · e9a1843 · e9a1843
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diff --git a/README.md b/README.md
@@ -1,47 +1,72 @@
 # nginx lab 
 
-Getting the image:
+- [Getting the image](#getting-the-image)
+- [Run the bare image](#run-the-bare-image)
+- [Configuration](#configuration)
+- [Proxy server](#proxy-server)
+- [Match request path with regex](#match-request-path-with-regex)
+- [Load balancing](#load-balancing)
+
+## Getting the image
 
 ```
 docker pull nginx
 ```
 
-Run the bare image:
+## Run the bare image
 
 ```
-docker run -d -p 80:80 nginx
+docker run --rm -d -p 80:80 nginx
 curl localhost
 ```
 
 You should get the **Welcome to nginx** web page.
 
+## Configuration
+
 Configuration directives's hierachy:
 - `main` context contains `events` and `http`
 - `http` contains `server`
 - `server` contains `location`
 
-
 Loading a minimal configuration (see `./nginx.conf` for details):
 ```
-docker run -v $(pwd)/nginx.conf:/etc/nginx/nginx.conf:ro -v $(pwd)/data:/data:ro -p80:80 nginx
+docker run --rm -v $(pwd)/nginx.conf:/etc/nginx/nginx.conf:ro -v $(pwd)/data:/data:ro -p80:80 nginx
 ```
 
 Then you should be able to get:
 - http://localhost
 - http://localhost/images/example.png
 
-Proxy server (see `nginx-proxy.conf`):
+## Proxy server
+
+See `nginx-proxy.conf`.
 
 ```
-docker run -v $(pwd)/nginx-proxy.conf:/etc/nginx/nginx.conf:ro -v $(pwd)/data:/data:ro -p80:80 nginx
+docker run --rm -v $(pwd)/nginx-proxy.conf:/etc/nginx/nginx.conf:ro -v $(pwd)/data:/data:ro -p80:80 nginx
 curl localhost
 ```
 
-Match request path with regex (see `nginx-regex.conf`):
+## Match request path with regex
+
+See `nginx-regex.conf`.
 
 ```
-docker run -v $(pwd)/nginx-regex.conf:/etc/nginx/nginx.conf:ro -v $(pwd)/data:/data:ro -p80:80 nginx
+docker run --rm -v $(pwd)/nginx-regex.conf:/etc/nginx/nginx.conf:ro -v $(pwd)/data:/data:ro -p80:80 nginx
 ```
 
 - http://localhost/example.png
 
+## Load balancing
+
+See `nginx-lb.conf`.
+
+```
+docker run --rm -d -v $(pwd)/nginx-lb.conf:/etc/nginx/nginx.conf:ro -v $(pwd)/data:/data:ro -p 80:80 nginx
+```
+
+Now if you keep reading from http://localhost, it will respond with these responses in round-robin order:
+
+- hello from site 1
+- hello from site 2
+- hello from site 3
diff --git a/data/site1/index.html b/data/site1/index.html
@@ -0,0 +1,5 @@
+<html>
+  <body>
+    <p>hello from site 1</p>
+  </body>
+</html>
diff --git a/data/site2/index.html b/data/site2/index.html
@@ -0,0 +1,5 @@
+<html>
+  <body>
+    <p>hello from site 2</p>
+  </body>
+</html>
diff --git a/data/site3/index.html b/data/site3/index.html
@@ -0,0 +1,5 @@
+<html>
+  <body>
+    <p>hello from site 3</p>
+  </body>
+</html>
diff --git a/nginx-lb.conf b/nginx-lb.conf
@@ -0,0 +1,29 @@
+http {
+    upstream myservers {
+        server 127.0.0.1:8081;
+        server 127.0.0.1:8082;
+        server 127.0.0.1:8083;
+    }
+
+    server {
+        listen 8081;
+        root /data/site1;
+    }
+
+    server {
+        listen 8082;
+        root /data/site2;
+    }
+
+    server {
+        listen 8083;
+        root /data/site3;
+    }
+
+    server {
+        location / {
+            proxy_pass http://myservers/;
+        }
+    }
+}
+events { }