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Docker Containers from Start to Enterprise: Build and Deploy with Kubernetes, Flannel, Cockpit and Atomic

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  • Copyright 2016
  • Dimensions: 7" x 9-1/8"
  • Pages: 320
  • Edition: 1st
  • eBook (Watermarked)
  • ISBN-10: 0-13-413665-9
  • ISBN-13: 978-0-13-413665-3

The Practical Guide to Running Docker on Linux Systems or Cloud Environments

Whether on your laptop or a remote cloud, Docker can transform how you create, test, deploy, and manage your most critical applications. In Docker Containers, Christopher Negus helps you master Docker containerization from the ground up.

You’ll start out running a few Docker container images in Ubuntu, Fedora, RHEL, CoreOS, or Project Atomic. By the time you’ve finished, you’ll be deploying enterprise-quality, multi-container Kubernetes setups in modern Linux and cloud environments.

Writing for system administrators, software developers, and technology enthusiasts, Negus touches on every aspect of working with Docker: setting up containerized applications, working with both individual and multiple containers, running containers in cloud environments, and developing containers.

Teaching through realistic examples of desktop applications, system services, and games, Negus guides you through building and deploying your own Dockerized applications. As you build your expertise, you’ll also learn indispensable Docker best practices for building and integrating containers, managing Docker on a day-to-day basis, and much more:

• Understanding what Docker is and what you can do with it
• Installing Docker on standard Linux or specialized container operating systems such as Atomic Host and CoreOS
• Setting up a container runtime environment and private Docker Registry
• Creating, running, and investigating Docker images and containers
• Finding, pulling, saving, loading, and tagging container images
• Pulling and pushing containers between local systems and Docker Registries
• Integrating Docker containers with host networking and storage
• Building containers with the docker build command and Dockerfile files
• Minimizing space consumption and erasing unneeded containers
• Accessing special host privileges from within a container
• Orchestrating multiple containers into complex applications with Kubernetes
• Using super privileged containers in cloud environments
• Managing containers in the cloud with Cockpit
• Getting started with Docker container development
• Learning container build techniques from shared Dockerfiles

This book is part of the Pearson Content Update Program. As the technology changes, sections of this book will be updated or new sections will be added. The updates will be delivered to you via a free Web Edition of this book, which can be accessed with any Internet connection.

Sample Content

Table of Contents

Preface     xv
Acknowledgments     xxi
About the Author     xxiii

Part I: Getting Going with Containers     1

Chapter 1: Containerizing Applications with Docker     3
Understanding Pros and Cons of Containerizing Applications     4
     ...An Application Running Directly on a Host Computer     4
     ...An Application Running Directly within a Virtual Machine     5
     Understanding the Upside of Containers     5
     Understanding Challenges of Containerizing Applications     7
Understanding What Makes Up Docker     8
     The Docker Project     8
     The Docker Hub Registry     9
     Docker Images and Containers     10
     The docker Command     11
Approaching Containers     13
Summary     14

Chapter 2: Setting Up a Container Run-Time Environment     17
Configuring a Standard Linux System for Docker     18
     Configuring Ubuntu for Docker     18
     Configuring Fedora for Docker     21
     Configuring Red Hat Enterprise Linux for Docker     25
     Configuring Other Operating Systems for Docker     27
Configuring a Container-Style Linux System for Docker     29
     Configuring an Atomic Host for Docker     29
     Configuring CoreOS for Docker     32
Summary     34

Chapter 3: Setting Up a Private Docker Registry     35
Getting and Starting a Private Docker Registry     36
     Setting Up a Docker Registry in Fedora     37
     Setting Up a Docker Registry in Ubuntu     40
Configuring a Private Docker Registry     43
     Configuring the docker-registry Package     43
     Configuring the registry Container     46
Understanding the Docker Image Namespace     46
Summary     48

Part II: Working with Individual Containers     49

Chapter 4: Running Container Images     51
Running Container Images Interactively     54
     Starting an Interactive Bash Shell     54
     Playing Some Character-Based Games     56
     Running Administrative Commands Inside a Container     57
Running Containerized Services     59
     Running a Containerized Web Server     59
     Limiting Resources When Running Services in Containers     62
Running Privileged Containers     63
Summary     64

Chapter 5: Finding, Pulling, Saving, and Loading Container Images     65
Searching for Images     66
     Searching for Images with the docker Command     66
     Searching for Images on Docker Hub     69
     Searching Other Repositories for Images     70
Pulling Images from Registries     73
Saving and Loading Images     76
Summary     77

Chapter 6: Tagging Images     79
Assigning Names to Images     80
Assigning Tags to Images     81
Assigning Repository Names to Images     83
     Attaching a User Name to an Image     83
     Attaching a Repository Name to an Image     85
Summary     86

Chapter 7: Investigating Containers     87
Inspecting Images and Containers     88
Inspecting an Image     88
     Inspecting Base Images with docker inspect     89
     Inspecting Application Images with docker inspect     90
     Looking at the History of an Image     92
Inspecting Running Containers     92
     Start a Container to Inspect     93
     Inspect an Entire Container Configuration     94
     Inspect Individual Container Attributes     99
Finding More Ways to Look into Containers     103
     Using docker top to See Container Processes     103
     Using docker attach to Interact with a Service Inside a Container     104
     Using docker exec to Start a New Process in a Running Container     105
     Using docker logs to See Container Process Output     106
     Using docker diff to See How a Container Has Changed     106
     Using docker cp to Copy Files from a Container     107
Summary     107

Chapter 8: Starting, Stopping, and Restarting Containers     109
Stopping and Starting a Container     109
     Stopping and Starting a Detached Container     110
     Starting and Stopping an Interactive Container     112
Restarting a Container     113
Sending Signals to a Container     114
Pausing and Unpausing Containers     115
Waiting for a Container’s Exit Code     116
Renaming a Container     117
Creating a Container     117
Summary     118

Chapter 9: Configuring Container Storage     121
Managing Storage for a Container     122
     Using Volumes from the Host     122
     Data Volume Container     123
     Write-Protecting a Bind Mount     124
     Mounting Devices     125
     Mounting Sockets     125
Storage Strategies for the Docker Host     127
     Attaching External Storage to a Docker Host     128
Summary     130

Chapter 10: Configuring Container Networking     133
Expose Ports to Other Containers     134
Map Ports Outside the Host     136
     Map a Port from Linked Containers     136
     Connect Containers on Different Hosts     138
Alternatives to the docker0 Bridge     139
     Changing Network Mode for a Container     140
     Examining Network Options     140
Changing the Docker Network Bridge     142
Summary     143

Chapter 11: Cleaning Up Containers     145
Making Space for Images and Containers     146
Removing Images     146
     Removing Individual Images     147
     Removing Multiple Images     148
Removing Containers     150
     Removing Individual Containers     150
     Removing Multiple Containers     152
Cleaning Up and Saving Containers     153
     Cleaning Up and Saving an Ubuntu Container     153
     Cleaning Up and Saving a Fedora Container     154
Summary     154

Chapter 12: Building Docker Images     157
Doing a Simple docker build     158
Setting a Command to Execute from a Dockerfile     161
     Using the CMD Instruction     161
     Using the ENTRYPOINT Instruction     162
     Using the RUN Instruction     163
     Adding Files to an Image from a Dockerfile     164
Exposing Ports from an Image within a Dockerfile     165
Assigning Environment Variables in a Dockerfile     166
Assigning Labels in a Dockerfile     167
Using Other docker build Command Options     168
Tips for Building Containers     169
     Clean Up the Image     169
     Keep Build Directory Small     169
     Keep Containers Simple     170
     Manage How Caching Is Done     170
Summary     171

Part III: Running Containers in Cloud Environments     173

Chapter 13: Using Super Privileged Containers     175
Using Super Privileged Containers in Atomic Host     176
Understanding Super Privileged Containers     176
     Opening Privileges to the Host     177
     Accessing the Host Process Table     177
     Accessing Host Network Interfaces     178
     Accessing Host Inter-Process Communications     179
     Accessing Host File Systems     179
Preparing to Use Super Privileged Containers     180
Using the atomic Command     180
     Installing an SPC Image with atomic     182
     Getting Information about an SPC Image with atomic     182
     Running an SPC Image with atomic     183
     Stopping and Restarting an SPC with atomic     184
     Updating an SPC Image     184
     Uninstalling an SPC Image     185
Trying Some SPCs     185
     Running the RHEL Tools SPC     186
     Running the Logging (rsyslog) SPC     187
     Running the System Monitor (sadc) SPC     189
Summary     191

Chapter 14: Managing Containers in the Cloud with Cockpit     193
Understanding Cockpit     194
Starting with Cockpit     198
Adding Servers into Cockpit     199
Working with Containers from Cockpit     201
     Adding Container Images to Cockpit     201
     Running Images from Cockpit     201
Working with Network Interfaces from Cockpit     204
Configuring Storage from Cockpit     207
Doing Other Administrative Tasks in Cockpit     208
     Managing Administrator Accounts in Cockpit     208
     Open a Terminal in Cockpit     209
Summary     210

Part IV: Managing Multiple Containers     211

Chapter 15: Orchestrating Containers with Kubernetes     213
Understanding Kubernetes     214
Starting with Kubernetes     216
Setting Up an All-in-One Kubernetes Configuration     218
     Installing and Starting Up Kubernetes     218
     Starting Up a Pod in Kubernetes     220
     Working with Kubernetes     223
Summary     224

Chapter 16: Creating a Kubernetes Cluster     225
Understanding Advanced Kubernetes Features     226
Setting Up a Kubernetes Cluster     226
     Step 1: Install Linux     227
     Step 2: Set Up Kubernetes Master     227
     Step 3: Set Up Kubernetes Nodes     230
     Step 4: Set Up Networking with Flannel     231
Starting Up Pods in a Kubernetes Cluster     233
Deleting Replication Controllers, Services, and Pods     237
Summary     238

Part V: Developing Containers     239

Chapter 17: Developing Docker Containers     241
Setting Up for Container Development     241
     Choosing a Container Development Environment for Red Hat Systems     242
     Container Development Environments from Docker     246
Using Good Development Practices     247
     Gathering or Excluding Files for a Build     248
     Taking Advantage of Layers     249
     Managing Software Packages in a Build     250
     Learning More about Building Containers     251
Summary     252

Chapter 18: Exploring Sample Dockerfile Files     253
Examining Dockerfiles for Official Docker Images     254
     Viewing a CentOS Dockerfile     254
     Viewing a Busybox Dockerfile     257
Examining Dockerfiles from Open Source Projects     258
     Viewing a WordPress Dockerfile     258
     Viewing the MySQL Dockerfile     260
Examining Dockerfiles for Desktop and Personal Use     263
     Viewing a Chrome Dockerfile     263
     Viewing a Firefox Dockerfile     267
Summary     270

Index     273


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