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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Installing Docker on CentOS

Another popular Linux distribution is CentOS, which is a free, enterprise-class distribution that is compatible with Red Hat Enterprise Linux (RHEL). Go through the following easy recipe to install Docker on CentOS 7.x.

Getting ready

The centos-extra repository must be enabled. This is usually enabled by default, but if you disabled it, please enable it again.

Previously, the Docker package had a different name: It was called docker or docker-engine; it is now called docker-ce. We will need to remove any previous Docker versions in order to prevent any conflicts:

$ sudo yum remove docker \
    docker-client \
    docker-client-latest \
    docker-common \
    docker-latest \
    docker-latest-logrotate \
    docker-logrotate \
    docker-selinux \
    docker-engine-selinux \
    docker-engine

It is OK if yum reports that none of these packages are installed.

How to do it...

Go through the following steps:

Install the required packages:

      $ sudo yum install -y yum-utils \
          device-mapper-persistent-data \
          lvm2

Set up the Docker yum repository using the stable channel:

        $ sudo yum-config-manager \
          --add-repo \
            https://download.docker.com/linux/centos/docker-ce.repo

Optional: Enable the test channel for access to the nightly builds:

        $ sudo yum-config-manager --enable docker-ce-test

Install the latest version of docker-ce:

         $ sudo yum install docker-ce

If prompted to accept the GPG key, verify that it matches 060A 61C5 1B55 8A7F 742B 77AA C52F EB6B 621E 9F35. If it does, then accept it:

    Retrieving key from https://download.docker.com/linux/centos/gpg
    Importing GPG key 0x621E9F35:
     Userid : "Docker Release (CE rpm) <[email protected]>"
     Fingerprint: 060a 61c5 1b55 8a7f 742b 77aa c52f eb6b 621e 9f35
     From : https://download.docker.com/linux/centos/gpg
    Is this ok [y/N]: y

Start the Docker daemon:

        $ sudo systemctl start docker

Verify that the installation worked:

        $ docker container run hello-world

How it works...

The preceding recipe installs Docker on CentOS and all the packages required by it.

There's more...

The default Docker daemon configuration file is located at /etc/docker, which is used while starting the daemon. Here are some basic operations:

To start the service, enter the following:

    $ sudo systemctl start docker

To verify the installation, enter the following:

    $ docker info

To update the package, enter the following:

    $ sudo yum -y upgrade

To enable the service start at boot time, enter the following:

    $ sudo systemctl enable docker

To uninstall Docker, enter the following:

        $ sudo yum remove docker-ce

To stop the service, enter the following:

        $ sudo systemctl stop docker

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

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