Docker Web Development

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DevOps@RajeshKumar.XYZ

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Course Agenda

Why Use Docker as a Developer?

Module Agenda

What Is Docker?

Lightweight, open, secure platform
Simplify building, shipping, running apps
Shipping container system for code
Runs natively on Linux or Windows Server
Runs on Windows or Mac Development
machines (with a virtual machine)
Relies on “images” and “containers”

The Role of Images and Containers

Image

A read-only template composed of layered

filesystems used to share common files and

create Docker container instances.

Container

An isolated and secured shipping container

created from an image that can be run,

started, stopped, moved and deleted.

Where Does Docker Run?

Docker Containers Versus Virtual Machines

Docker Benefits(for Web Developers)

Docker Benefits

(for Web Developers)

Accelerate Developer On boarding

Eliminate App Conflicts

Environment Consistency

Ship Software Faster

Docker Tools

Docker Toolbox

Provides image and container tools

Virtual Machine (for Windows/Mac)

Works on Windows, Mac, Linux

https://www.docker.com/docker-toolbox

Docker Toolbox Tools

Docker in Action

Summary

Docker simplifies building, shipping and running apps
Runs natively on Linux and Windows Server
Docker is NOT the same as using Virtual Machines
Key benefits to Web Developers:-

Setting up Your Dev Environment with Docker Toolbox

Module Agenda

Installing Docker Toolbox on Mac

Installing Docker Toolbox on Windows

Getting Started with Docker Kitematic

Docker Kitematic Overview

Summary

Docker Toolbox provides several tools that help manage images and containers

Docker Toolbox includes VirtualBox for running Docker on Mac or Windows

Docker Kitematic provides a visual way to work with images and containers

Using Docker Machine and Docker Client

Module Agenda

Docker Toolbox

Docker Client
Docker Machine
Docker Compose
Docker Kitematic
VirtualBox

Getting Started with Docker Machine

Docker Machine Overview

Key Docker MachineCommands

docker-machine Is
docker-machine start [machine name]
docker-machine stop [machine name]
docker-machine env [machine name)
docker-machine ip [machine name]

Docker Machine in Action (Mac)

Docker Machine in Action (Windows)

Getting Started with Docker Client

Docker Client Overview

Key Docker Client Commands

docker pull [image name]
docker run [image name]
docker images
docker ps

Docker Client in Action (Mac)

Docker Chent in Action (Windows)

Docker Commands Review

Key Docker Client Image Commands

docker pull [image name]
docker images
docker rmi [image ID]

Key Docker Client Container Commands

docker run [image name]
docker ps -a
docker rm [container ID]

Summary

Docker Machine creates and manages machines

Docker Client manages images and containers

Hooking Your Source Code into a Container

Module Agenda

Answer

1. Create a container volume that points to the source code.
2. Add your source code into a custom image that is used to create a container.

The Layered File System

Layers (From a Dessert Perspective)

Images, Containers and File Layers

Containers Can Share Image Layers

Containers and Volumes

Docker Volumes

What is a Volume?

Special type of directory in a container typically referred to as a “data volume”
Can be shared and reused among containers
Updates to an image won’t affect a data volume
Data volumes are persisted even after the container is deleted

Volume Overview

Source Code, Volumes and Containers

Understanding Volumes

Creating a Data Volume

Locating a Volume

Customizing Volumes

Customizing the Host Location for a Data Volume

Locating a Volume

Hooking a Volume to Node.js Source Code

Hooking a Volume to ASP.NET Source Code

Removing Containers and Volumes

Creating a Docker Managed Volume

docker run -p 8080:3000 nudvar/www node

Docker Controlled Volumes

docker inspect mycontainer

					
		...
		“Mounts”: [
			{
			“Name”: “d185...86459”,
			“Source”: “/mnt/.../var/Iib/docker/volumes/d185...86459/ data”,
			“Destination”: “/var/www”,
			“Driver”: “local”,
			“RN”: true
			}
		]
		...

Removing Volumes

docker rm -v lastContainer

summary

Docker images and containers rely on a “layered file system”
Source Code can be hooked to a container using volumes:
- docker run -v
Volumes are persisted on the Docker Host
Volumes can be removed using:
- docker rm -v last Container

Building Custom Images with Dockerfile

Module Agenda

Answer

Create a container volume that points to the source code.
Add your source code into a custom image that is used to create a container.

Getting Started with Dockerfile

Dockerfile and Images

Dockerfile Overview

Text file used to build Docker images
Contains build instructions
Instructions create intermediate image that can be cached to speed up future builds
Used with “docker build” command

Key Dockerfile Instructions

Dockerfile Example

Creating a Custom Node.js Dockerfile

Building a Node.js Image

Building a Custom Image

Creating a Custom ASP.NET Core Dockerfile

Buflding an ASP.NET Core Image

Building a Custom Image

Publishing an Image to Docker Hub

Summary

Dockerfile is a simple text file with instructions that is used to create an image
Each Dockerfile starts with a FROM instruction
Custom images are built using:
- docker build -t /imageName
Images can be pushed to Docker Hub

Communicating Between Docker Containers

Module Agenda

Getting Started with Container Linking

The Need for Linked Containers

Docker Container Linking Options

Linking Containers by Name (legacy linking)

Steps to Link Containers

1. Run a Container with a Name

2. Link to Running Container By Name

3. Repeat for Additional Containers

Linking Node.js and MongoDB Containers

Linking ASP.NET Core and PostgreSQL Containers

Getting Started with Container Networks

Understanding Container Networks

Steps to Create a Container Network

1. Create a Custom Container Network

2. Run Containers in the Container Network

Container Networks in Action

Linking Multiple Containers

Is There an Easier Way?

Docker Compose Can Simplify Container Linking

summary

Docker containers communicate using link or network functionality
The --link switch provides “legacy linking”
The --net command-line switch can be used to setup a bridge network
Docker Compose can be used to link multiple containers to each other

Managing Containers with Docker Compose

Module Agenda

Getting Started with Docker Compose

Docker Compose Manages Your Application Lifecycle

Docker Compose Features

Manages the whole application lifecycle:

Start, stop and rebuild services
View the status of running services
Stream the log output of running services
Run a one-off command on a service

The Need for Docker Compose

Docker Compose Workflow

The docker-compose.yml File

The Role of the Docker Compose File

Docker Compose and Services

Key Service Configuration Options

build	environment	image
networks	ports	volumes

docker-compose.yml Example

						
		version: ‘2’
		services:
		node:
		build:
		context:.
		dockerfile: node.dockerfile
		networks:
		-nodeapp-network
		mongodb:
		Image: mongo
		networks:
		- nodeapp-network
		networks:
		nodeapp-network
		driver: bridge

Docker Compose Commands

Key Docker Compose Commands

docker-compose build
docker-compose up
docker-compose down
docker-compose logs
docker-compose ps
docker-compose stop
docker-compose start
docker-compose rm

Building Services

Building Specific Services

Starting Services Up

Creating and Starting Containers

Tearing Down Services

Stop and Remove Containers

Stop and Remove Containers, Images, Volumes

Docker Compose in Action

Setting up Development Environment Services

Development Environment Services

CreaUng a Custom docker-compose.yml File

Managing Development Environment Services

Summary

Docker Compose simplifies the process of building, starting and stopping services
docker-compose.ymldefines services
Excellent way to manage services used in a development environment
Key DockerCompose commands include "build", "up" and "down"

Running Your Containers in the Cloud

Module Agenda

Getting Started with Docker Cloud

Deploying Containers to the Cloud

Docker Cloud Features

Link to Different Cloud Providers
Setup and provision nodes
Create a stack of Dockerservices to deploy in the cloud
Manage stacks and services

DockerCloud Workflow

Linking to a Cloud Provider

Deploying a Node

Creating a Stack

Managing Stack Services

Summary

Docker Cloud provides a simplified way to migrate a development environment to the cloud
Relies on a YAML file
Docker Cloud can:

Reviewing the Case for Docker

Docker Web Development Benefits

Images and Containers

Docker Toolbox

Docker Volumes

Dockerfileand Custom Images

Docker Compose

					   
	version: '2'					   
	services:
	
	  node:
	   build:
	    context: .
	    dockerfile: node.dockerfile
	   networks:
	    -nodeapp-network
	
	mongodb:
	 image: mongo
	 networks: 
	  -nodeapp-network
	  
	networks:
	 nodeapp-network
	   driver: bridge

Docker for Web Developers

WHY USE DOCKER AS A DEVELOPER?