Docker Cookbook - Second Edition

By : Ken Cochrane, Jeeva S. Chelladhurai, Neependra K Khare

2 (1)

Buy this Book

Docker Cookbook - Second Edition

2 (1)

By: Ken Cochrane, Jeeva S. Chelladhurai, Neependra K Khare

Buy this Book

Overview of this book

Docker is an open source tool used for creating, deploying, and running applications using containers. With more than 100 self-contained tutorials, this book examines common pain points and best practices for developers building distributed applications with Docker. Each recipe in this book addresses a specific problem and offers a proven, best practice solution with insights into how it works, so that you can modify the code and configuration files to suit your needs. The Docker Cookbook begins by guiding you in setting up Docker in different environments and explains how to work with its containers and images. You’ll understand Docker orchestration, networking, security, and hosting platforms for effective collaboration and efficient deployment. The book also covers tips and tricks and new Docker features that support a range of other cloud offerings. By the end of this book, you’ll be able to package and deploy end-to-end distributed applications with Docker and be well-versed with best practice solutions for common development problems.

Preface

Who this book is for

What this book covers

To get the most out of this book

Sections

Get in touch

Free Chapter

Introduction and Installation

Introduction

Verifying requirements for Docker installation

Installing Docker on Ubuntu

Installing Docker on CentOS

Installing Docker on Linux with an automated script

Installing Docker for Windows

Installing Docker for Mac

Pulling an image and running a container

Adding a nonroot user to administer Docker

Finding help with the Docker command line

Working with Docker Containers

Introduction

Listing/searching for an image

Looking at the container logs

Stopping a container

Removing a container

Removing all stopped containers

Setting the restart policy on a container

Getting privileged access inside a container

Accessing the host device inside a container

Injecting a new process into a running container

Reading a container's metadata

Labeling and filtering containers

Reaping a zombie inside a container

Working with Docker Images

Introduction

Creating an image from the container

Creating an account with Docker Hub

Logging in and out of the Docker image registry

Publishing an image to the registry

Looking at the history of an image

Removing an image

Exporting an image

Importing an image

Building an image using a Dockerfile

Building an Apache image – a Dockerfile example

Setting up a private index/registry

Automated builds – with GitHub and Bitbucket

Creating a custom base image

Creating a minimal image using a scratch base image

Building images in multiple stages

Visualizing the image hierarchy

Network and Data Management for Containers

Introduction

Accessing containers from outside

Attaching containers to a host network

Launching containers with no network

Sharing IP addresses with other containers

Creating a user-defined bridge network

Discovering and load balancing containers

Persisting data using volumes

Sharing data between the host and the container

Docker Use Cases

Introduction

Testing with Docker

Performing CI/CD with Shippable and Heroku

Performing CI/CD with TravisCI

Setting up PaaS with OpenShift origin

Building and deploying an app on OpenShift from the source code

Docker APIs and SDKs

Introduction

Working with images using APIs

Building images using APIs

Launching containers using APIs

Performing container operations using APIs

Exploring Docker remote API client libraries

Configuring the Docker daemon for remote connectivity

Securing the Docker daemon's remote connectivity

Docker Performance

Introduction

Benchmarking CPU performance

Benchmarking disk performance

Benchmarking network performance

Getting container resource usage using the stats feature

Setting up performance monitoring

Docker Orchestration and Hosting a Platform

Introduction

Running applications with Docker Compose

Setting up a cluster with Docker Swarm

Using secrets with Docker Swarm

Setting up a Kubernetes cluster

Using secrets with Kubernetes

Scaling up and down in Kubernetes cluster

Setting up WordPress with Kubernetes clusters

Docker Security

Introduction

Setting Mandatory Access Control (MAC) with SELinux

Allowing writes to volumes mounted from the host with SELinux ON

Removing capabilities to break down the power of a root user inside a container

Sharing namespaces between the host and the container

Getting Help and Tips and Tricks

Introduction

Starting Docker in debug mode

Building a Docker binary from the source

Building images without using cached layers

Building your own bridge for container communication

Changing the default OCI runtime

Selecting the logging driver for containers

Getting real-time Docker events for containers

Docker on the Cloud

Introduction

Docker for AWS

Deploying WordPress on Docker for AWS

Docker for Azure

Deploying Joomla! on Docker for Azure

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Verifying requirements for Docker installation

Docker is supported on many Linux platforms, such as RHEL, Ubuntu, Fedora, CentOS, Debian, Arch Linux, among others. It is also supported on many cloud platforms, such as Amazon Web Services, Digital Ocean, Microsoft Azure, and Google Cloud. Docker has also released desktop applications for Microsoft Windows and Mac OS X that allows you to easily get Docker up and running directly on your local machine.

In this recipe, we will verify the requirements for Docker installation. We will look at a system with an Ubuntu 18.04 LTS installation, though the same steps should work on other Linux flavors as well.

Getting ready

How to do it...

Perform the following steps:

1. Docker is not supported on 32-bit architecture. To check the architecture on your system, run the following command:

        $ uname -i
        x86_64

Docker is supported on kernel 3.8 or later. It has been back-ported on some of the kernel 2.6, such as RHEL 6.5 and above. To check the kernel version, run the following command:

      $ uname -r
      4.15.0-29-generic

Running the kernel should support an appropriate storage backend. Some of the options for such a backend are VFS, DeviceMapper, AUFS, Btrfs, zfs, and Overlayfs.

For Ubuntu, the default storage backend or driver is overlay2, which has been available since Ubuntu 14.04. Another popular one is DeviceMapper, which uses the device-mapper thin provisioning module to implement layers. It should be installed by default on a majority of Linux platforms. To check for device-mapper, you can run the following command:

            $ grep device-mapper /proc/devices
            253 device-mapper

On most distributions, AUFS would require a modified kernel.

Support for cgroups and namespaces have been in the kernel for sometime, and should be enabled by default. To check for their presence, you can look at the corresponding configuration file of the kernel you are running. For example, on Ubuntu, I can do something like the following:

    $ grep -i namespaces /boot/config-4.15.0-29-generic
    CONFIG_NAMESPACES=y

    $ grep -i cgroups /boot/config-4.15.0-29-generic
    CONFIG_CGROUPS=y

The name of the config file is usually dependent on your kernel version. Your system might have a different filename. If this is the case, change the command accordingly.

How it works...

Docker requires that the host system meets a basic set of requirements in order for it to run correctly. By running the preceding commands, we were able to confirm that our system meets those requirements.

Docker Cookbook - Second Edition

By : Ken Cochrane, Jeeva S. Chelladhurai, Neependra K Khare

Docker Cookbook - Second Edition

By: Ken Cochrane, Jeeva S. Chelladhurai, Neependra K Khare

Overview of this book

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