Add nginx configuration section

.gitignore

@@ -1,3 +1,3 @@
 book
-notes
 src/tmp
+notes

notes

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 notes.
 
+29/06/2020
+
+ - todo: add styling conventions section
+   - code comments: Capitalized first word and period at the end.
+
+-----
+
 chapter_1.md
  - Introduction
 

src/SUMMARY.md

@@ -9,6 +9,7 @@
 - [Software](./software/index.md)
   - [Operating System](./software/operating_system/index.md)
     - [Networking](./software/operating_system/networking.md)
+    - [Nginx](./software/operating_system/nginx.md)
   - [Microservices](./software/microservices/index.md)
     - [peach-buttons](./software/microservices/peach-buttons.md)
     - [peach-menu](./software/microservices/peach-menu.md)

src/software/operating_system/nginx.md

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+# Nginx Configuration
+
+[Nginx](https://www.nginx.com/) is used as a reverse proxy for the `peach-web` application. Requests to `http://peach` and `http://www.peach` on port `80` are passed to the `peach-web` application on `http://127.0.0.1:3000`.
+
+The configuration file for `nginx` can be found at `/etc/nginx/sites-available/peach.conf`. The contents are as follows:
+
+```
+server {
+        listen 80;
+        server_name peach www.peach;
+        location / {
+                proxy_pass http://127.0.0.1:3000;
+        }
+}
+```
+
+## Nginx Cheatsheet
+
+Symlink `sites-available/*.conf` to `sites-enabled/*.conf`:
+
+`sudo ln -s /etc/nginx/sites-available/peach.conf /etc/nginx/sites-enabled/`
+
+Check correctness of configuration:
+
+`sudo nginx -t`
+
+Reload nginx:
+
+`sudo nginx -s reload`