Book Image

Learn Docker - Fundamentals of Docker 19.x - Second Edition

By : Dr. Gabriel N. Schenker
Book Image

Learn Docker - Fundamentals of Docker 19.x - Second Edition

By: Dr. Gabriel N. Schenker

Overview of this book

Containers enable you to package an application with all the components it needs, such as libraries and other dependencies, and ship it as one package. Docker containers have revolutionized the software supply chain in both small and large enterprises. Starting with an introduction to Docker fundamentals and setting up an environment to work with it, you’ll delve into concepts such as Docker containers, Docker images, and Docker Compose. As you progress, the book will help you explore deployment, orchestration, networking, and security. Finally, you’ll get to grips with Docker functionalities on public clouds such as Amazon Web Services (AWS), Azure, and Google Cloud Platform (GCP), and learn about Docker Enterprise Edition features. Additionally, you’ll also discover the benefits of increased security with the use of containers. By the end of this Docker book, you’ll be able to build, ship, and run a containerized, highly distributed application on Docker Swarm or Kubernetes, running on-premises or in the cloud.
Table of Contents (25 chapters)
1
Section 1: Motivation and Getting Started
4
Section 2: Containerization, from Beginner to Black Belt
11
Section 3: Orchestration Fundamentals and Docker Swarm
18
Section 4: Docker, Kubernetes, and the Cloud

Chapter 10

Here are some sample answers to the questions presented in this chapter:

  1. The three core elements are sandbox, endpoint, and network.
  2. Execute this command:
$ docker network create --driver bridge frontend
  1.  Run this command:

$ docker container run -d --name n1 \
--network frontend -p 8080:80 nginx:alpine
$ docker container run -d --name n2 \
--network frontend -p 8081:80 nginx:alpine

Test that both NGINX instances are up and running:

$ curl -4 localhost:8080
$ curl -4 localhost:8081

You should be seeing the welcome page of NGINX in both cases.

  1. To get the IPs of all attached containers, run this command:
$ docker network inspect frontend | grep IPv4Address

You should see something similar to the following:

"IPv4Address": "172.18.0.2/16",
"IPv4Address": "172.18.0.3/16",

To get the subnet used by the network, use the...