docs: add angular docker setup guidelines (#59)

docker-setups/angular-docker.md

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+# Setting Up Docker Environment for Angular Application with Nginx
+
+## Table of Contents
+
+1. [Introduction](#1-introduction)
+   - [Purpose](#purpose)
+   - [Scope](#scope)
+2. [Prerequisites](#2-prerequisites)
+3. [Set up for Angular project](#3-set-up-for-angular-project)
+4. [Setting up the Docker Environment](#4-setting-up-the-docker-environment)
+   - [Dockerfile](#41-dockerfile)
+      - [Angular version-specific file path for Nginx](#set-the-correct-file-path-for-nginx)
+   - [Docker Compose](#42-docker-compose)
+   - [nginx.conf](#43-nginxconf)
+   - [.dockerignore](#44-dockerignore)
+5. [Testing the Docker Environment](#5-testing-the-docker-environment)
+   - [Using docker-compose](#build-and-run-using-docker-compose-file)
+   - [Step by step build](#or-alternatively-build-step-by-step)
+6. [Access Angular Application](#6-access-angular-application)
+7. [Sample Repository](#7-sample-repository)
+8. [Conclusion](#8-conclusion)
+   - [Benefits of Docker Setup](#benefits-of-docker-setup)
+   - [Future Enhancements](#future-enhancements)
+
+Each section is linked to its corresponding content in the document for easy navigation.
+
+## 1. Introduction
+
+### Purpose
+
+The purpose of this document is to provide a guide for setting up a Docker environment for an Angular 17 application and to host it on nginx server.
+
+### Scope
+
+- This document covers the basic setup of a Docker environment for an Angular application, including Dockerfile creation, Docker Compose setup, and database configuration.
+
+- Dockerization is done on an app built on Angular version 17.1.0
+
+- This document also covers Dockerization for apps built on Angular version 16 and below.
+
+[Back to top](#table-of-contents)
+
+## 2. Prerequisites
+
+Before setting up the Docker environment, ensure you have the following prerequisites:
+
+- Docker installed on your local machine.
+- An Angular application set up with necessary dependencies.
+- Basic knowledge of Docker and Docker Compose.
+
+Download links:
+
+- [Docker](https://docs.docker.com/get-docker/)
+- [Node.js](https://nodejs.org/en/download/)
+- [Angular CLI](https://angular.io/guide/setup-local)
+- [Visual Studio Code (Optional)](https://code.visualstudio.com/)
+
+[Back to top](#table-of-contents)
+
+## 3. Set up for Angular project
+
+In `package.json`, set the command to build the application with production configuration:
+
+```jsonc
+// package.json
+{
+  // ...
+  "scripts": {
+    // Other Commands
+    // Add the following line under "scripts"
+    "build:prod": "ng build --configuration production"
+  }
+  // ...
+}
+```
+
+[Back to top](#table-of-contents)
+
+## 4. Setting up the Docker Environment
+
+### 4.1 Dockerfile
+
+Create a Dockerfile in the root directory of your Angular application.
+
+```Dockerfile
+### Stage 0: Build ###
+#--------------------------------------
+# Use an official Node runtime as a parent image
+FROM node:20 AS builder
+
+# Set the working directory in the container
+WORKDIR /usr/src/app
+
+# Copy package.json and package-lock.json to the working directory
+COPY package*.json ./
+
+# Install Angular CLI Globally
+RUN npm install -g @angular/cli
+
+# Install app dependencies
+RUN npm install
+
+# Copy the rest of the application code
+COPY . .
+
+# Build the Angular app for production
+RUN npm run build:prod
+
+### Stage 1: Run ###
+#--------------------------------------
+# Defining nginx image to be used
+FROM nginx:latest AS ngi
+
+# Fetch APP_NAME from docker-compose
+ARG APP_NAME
+
+# Create App Path for build files for Angular 17 and above projects
+# For versions older than 17, replace APP_PATH with /usr/src/app/dist/*
+ENV APP_PATH=/usr/src/app/dist/${APP_NAME}/browser
+
+# Copy the built Angular app to the default Nginx public folder
+COPY --from=builder $APP_PATH /usr/share/nginx/html/
+
+# Need to make nginx config file
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+# Expose port 80
+EXPOSE 80
+
+# Start Nginx when the container starts
+CMD ["nginx", "-g", "daemon off;"]
+```
+
+### Set the Correct File Path for Nginx
+
+#### Why?
+
+- When you run the command `ng build`, a `dist` folder is created which contains all angular build files.
+- Depending on the CLI version, different folder structures are created.
+- We need to give the path of `index.html` for Nginx to work.
+
+#### How to find folder name?
+
+- Folder name is present in `package.json` as `"name": "your-app-name"`
+- Verify the folder name by running `ng build` and checking in `dist` folder.
+
+#### 1. For angular version 17
+
+```
+build file folder structure
+
+dist
+| your-app-name
+| | browser
+| | | index.html
+| | | <...other build files>
+| | license
+```
+**Define APP_NAME in `docker-compose.yml`:**
+
+- Define `${APP_NAME}` in [docker compose file](#42-docker-compose) and skip this section.
+
+**OR ALTERNATIVELY**
+
+**Update `Dockerfile`:**
+
+- Update `ENV APP_PATH` by directly replacing `${APP_NAME}` with your application name like so:
+```Dockerfile
+ENV APP_PATH=/usr/src/app/dist/your-app-name/browser
+```
+
+#### 2. For angular versions 16 and below:
+
+```
+Build file folder structure
+
+dist
+| your-app-name
+| | index.html
+| | <...other build files>
+```
+
+**Update `Dockerfile`:**
+
+- Remove the line `ARG APP_NAME`
+- Set `ENV APP_PATH` as `/usr/src/app/dist/*`:
+```Dockerfile
+ENV APP_PATH=/usr/src/app/dist/*
+```
+
+[Back to top](#table-of-contents)
+
+### 4.2 Docker Compose
+
+Create a `docker-compose.yml` file in the root directory of your project. Set the arg `APP_NAME` as the name of your application if [not updated in Dockerfile](#1-for-angular-version-17).
+
+```yml
+services:
+  angular-docker:
+    build:
+      context: .
+      dockerfile: Dockerfile
+      args:
+        APP_NAME: your-app-name
+    image: angular-sample-image
+    container_name: angular-sample-container
+    ports:
+      - '127.0.0.1:5000:80'
+
+```
+
+[Back to top](#table-of-contents)
+
+### 4.3 nginx.conf
+
+Create a `nginx.conf` file in your root directory folder (where the `package.json` is located) and copy the below code into it.
+
+```plaintext
+server {
+    listen 80;
+
+    location / {
+        root /usr/share/nginx/html;
+        index index.html;
+        try_files $uri $uri/ /index.html;
+    }
+}
+```
+
+[Back to top](#table-of-contents)
+
+### 4.4 Dockerignore
+
+Create a `.dockerignore` file to exclude unnecessary files and directories from being copied into the Docker image. This helps in reducing the image size.
+
+```plaintext
+.git
+.gitignore
+.editorconfig
+/.vscode/*
+/node_modules
+/npm-debug.log
+/e2e
+/docs
+*.zip
+```
+
+[Back to top](#table-of-contents)
+
+## 5. Testing the Docker Environment
+
+### Build and run using docker-compose file
+
+Run the following command to build and compose your docker image using docker-compose.
+
+```shell
+docker-compose -f docker-compose.yml up
+```
+### OR Alternatively build step by step
+
+#### Build Docker Image
+
+Run the following command in the root directory of your project to build the Docker images. Replace `your-app-name` with a suitable value as an argument:
+
+```shell
+docker build --build-arg APP_NAME=your-app-name -t ng-docker-app:v1.0.0 -f ./Dockerfile .
+```
+
+#### Create Docker Containers
+
+Start the Docker containers using the following command:
+
+```shell
+docker run -p 5000:80 -d ng-docker-app:v1.0.0
+```
+
+#### Optional: To get the list of currently running containers
+
+```shell
+docker container ls
+```
+
+[Back to top](#table-of-contents)
+
+## 6. Access Angular Application
+
+You can access your Angular application at http://localhost:5000
+
+[Back to top](#table-of-contents)
+
+## 7. Sample Repository
+
+Explore the following practical demonstration for dockerizarion of angular app: [Repository Link](https://github.com/OsmosysSoftware/angular-docker-sample)
+
+[Back to top](#table-of-contents)
+
+## 8. Conclusion
+
+### Benefits of Docker Setup
+
+Setting up a Docker environment for your Angular application with Nginx offers several benefits:
+
+- Easy deployment and scalability.
+- Consistent development environment across different machines.
+- Simplified dependency management.
+
+[Back to top](#table-of-contents)
+
+### Future Enhancements
+
+Consider enhancing your Docker setup by adding features such as environment-specific configurations, health checks, and Docker Swarm/Kubernetes integration for production deployments.
+
+[Back to top](#table-of-contents)