Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Free Learning
Arrow right icon
Beginning DevOps with Docker
Beginning DevOps with Docker

Beginning DevOps with Docker: Automate the deployment of your environment with the power of the Docker toolchain

eBook
€6.99 €10.99
Paperback
€12.99
Subscription
Free Trial
Renews at €18.99p/m

What do you get with Print?

Product feature icon Instant access to your digital eBook copy whilst your Print order is Shipped
Product feature icon Paperback book shipped to your preferred address
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
OR
Modal Close icon
Payment Processing...
tick Completed

Shipping Address

Billing Address

Shipping Methods
Table of content icon View table of contents Preview book icon Preview Book

Beginning DevOps with Docker

Chapter 2. Application Container Management

In this lesson, we will scale one of the containers we built into a multi-tier setup. This will involve splitting the application into different logical sections. For example, we could have an application running on a Docker container and the application's data in a separate database container; however, both should work as a single entity. For this, we will use Docker's tool for running multi-container applications. The tool goes by the name docker-compose. In summary, docker-compose is the tool used for defining and running multi-container Docker applications.

Lesson Objectives

By the end of this lesson, you will be able to:

  • Get an overview of a multi-container application setup
  • Work through the docker-compose file and CLI
  • Manage multiple containers and distributed application bundles
  • Set up a network with docker-compose
  • Handle and debug the different application layers

The docker-compose Tool

Let's begin the lesson by looking at what a multi-container setup is, why it is important, and how Docker, with the tool docker-compose, works like a charm in such scenarios.

We have recently been introduced to how applications work, with their separate elements: frontend, backend, and database.

To run such a multi-tier application using Docker, one would need to run the following commands to spin up the containers in different terminal sessions:

- docker run <front-end>
- docker run <back-end>
- docker run <database>

Note

You can run docker run with (-d) as detached to prevent us from running the three commands in separate sessions, for example: docker run <front-end> -d

That said, it even becomes particularly tasking linking different containers (networking).

docker-compose comes in to save the day. We can define and run multi-containers from one file - docker-compose.yml. In the following topics, we'll discuss this further. First,...

Overview of a Multi-Container Application Setup

In the previous lesson, we introduced Docker and containerization. We ran sample Python and JavaScript scripts as demonstrations of how applications can be containerized and how images can be built. We are now ready to run an application that goes beyond that.

In a Dockerfile, every line describes a layer. The union filesystem used in Docker allows different directories to transparently overlay, forming a single, coherent filesystem. The foundational layer is always an image which you build upon. Each additional line with a command, say, RUN, CMD, and so on, adds a layer to it. The advantage of layers is that as long as the layer has not been modified, it will not bother building that part of the image. Secondly, as an image is pulled from a Docker image registry, it is pulled in layers, therefore mitigating issues such as connection cuts during pulling and pushing of images.

Many applications are built under a common structure: frontend, backend...

Managing Multiple Containers and Distributed Application Bundles

This is the docker-compose.yml for running a Django application. A similar application can be found in the docker-compose documentation under the Django example.

Download the Django example from: ttps://docs.docker.com/compose/django/:

Managing Multiple Containers and Distributed Application Bundles

Note

Refer the complete code placed at Code/Lesson-2/django-docker-compose.yml.

Go to https://goo.gl/H624J1 to access the code.

Improve a Docker Workflow

To give more context on how docker-compose is involved and how it improves a Docker workflow.

  1. Create a new directory and name it django_docker.
  2. In the django-docker directory, create a new docker-compose.yml and add the information in the figure above, or in the django-docker-compose.yml script provided.
  3. Create a new Dockerfile and add the content in the Dockerfile script provided.
  4. Create a requirements file; simply copy the django-requirements.txt file provided.
  5. Run docker-compose up and observe the logs.

Notice that we are able to spin up both containers...

Networking with docker-compose

By default, docker-compose sets up a single network for your application(s) where each container can reach and discover other containers.

The network is given a name based on the name of the directory it lives in. Thus, if your directory is called py_docker, when your run docker-compose up, the network created is called py_docker_default.

We mentioned ports in the previous topic, when creating the WordPress container. To explain networking better, we'll use the docker-compose.yml used to spin up a WordPress application:

Networking with docker-compose

In this file, we have two services: db and wordpress.

In the WordPress service, we have the ports option mapping port 80 to port 8000. No wonder, the WordPress app runs on 0.0.0.0:8000 on our browsers.

The ports option is not in the db service. However, if you go to the docker hub page for mysql, you'll notice that port 3306 is exposed. This is the standard port for MySQL. You can obtain more information on MySQL from: https://hub.docker...

Summary

In this lesson, we have done the following:

  • Discussed and displayed a multi-container setup
  • Walked through docker-compose commands to build and run multiple containers in a parallel manner
  • Gained a high-level understanding of networking containers and how data is persisted in a container from local machines
  • Built and run applications without even setting them up, via Docker Hub
Left arrow icon Right arrow icon

Key benefits

  • Learn how to structure your own Docker containers
  • Create and manage multiple configuration images
  • Understand how to scale and deploy bespoke environments

Description

Making sure that your application runs across different systems as intended is quickly becoming a standard development requirement. With Docker, you can ensure that what you build will behave the way you expect it to, regardless of where it's deployed. By guiding you through Docker from start to finish (from installation, to the Docker Registry, all the way through to working with Docker Swarms), we’ll equip you with the skills you need to migrate your workflow to Docker with complete confidence.

Who is this book for?

This book is ideal for developers, system architects and site reliability engineers (SREs) who wish to adopt a Docker-based workflow for consistency, speed and isolation of system resources within their applications. You’ll need to be comfortable working with the command line.

What you will learn

  • Learn to design and build containers for different kinds of applications
  • Create a testing environment to identify issues that may cause production deployments to fail
  • Discover how you can correctly structure and manage a multi-tier environment
  • Run, debug, and experiment with example applications in Docker containers
Estimated delivery fee Deliver to Italy

Premium delivery 7 - 10 business days

€17.95
(Includes tracking information)

Product Details

Country selected
Publication date, Length, Edition, Language, ISBN-13
Publication date : May 29, 2018
Length: 96 pages
Edition : 1st
Language : English
ISBN-13 : 9781789532401
Concepts :
Tools :

What do you get with Print?

Product feature icon Instant access to your digital eBook copy whilst your Print order is Shipped
Product feature icon Paperback book shipped to your preferred address
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
OR
Modal Close icon
Payment Processing...
tick Completed

Shipping Address

Billing Address

Shipping Methods
Estimated delivery fee Deliver to Italy

Premium delivery 7 - 10 business days

€17.95
(Includes tracking information)

Product Details

Publication date : May 29, 2018
Length: 96 pages
Edition : 1st
Language : English
ISBN-13 : 9781789532401
Concepts :
Tools :

Packt Subscriptions

See our plans and pricing
Modal Close icon
€18.99 billed monthly
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Simple pricing, no contract
€189.99 billed annually
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just €5 each
Feature tick icon Exclusive print discounts
€264.99 billed in 18 months
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just €5 each
Feature tick icon Exclusive print discounts

Frequently bought together


Stars icon
Total 82.97
Practical DevOps, Second Edition
€36.99
Beginning DevOps with Docker
€12.99
Learn Docker - Fundamentals of Docker 18.x
€32.99
Total 82.97 Stars icon
Banner background image

Table of Contents

4 Chapters
1. Images and Containers Chevron down icon Chevron up icon
2. Application Container Management Chevron down icon Chevron up icon
3. Orchestration and Delivery Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

Customer reviews

Top Reviews
Rating distribution
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.9
(7 Ratings)
5 star 71.4%
4 star 0%
3 star 0%
2 star 0%
1 star 28.6%
Filter icon Filter
Top Reviews

Filter reviews by




Rohith Sep 21, 2023
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Subscriber review Packt
Gary Waltman Jul 07, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Easy read
Amazon Verified review Amazon
Amazon Customer Jun 14, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Excellent book.
Amazon Verified review Amazon
Dominic Motuka Jul 09, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Joseph has a solid grasp of the subject and understands that DevOps is more than just a series of scripts written and maintained by the (mostly) operations staff that tries to run with DevOps. Docker has been introduced to us ( the readers ) in a simple way.Well written and nicely illustrated with color images. This is an excellent introduction to Docker.
Amazon Verified review Amazon
NdagiStanley Aug 22, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Beginning DevOps with Docker is a must-read for individuals who expect proper code and written analogies that will enhance their understanding of the overall use of docker in DevOps. The docker commands are well explained, everything to get you from beginner to guru.
Amazon Verified review Amazon
Get free access to Packt library with over 7500+ books and video courses for 7 days!
Start Free Trial

FAQs

What is the delivery time and cost of print book? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela