Book Image

Learn OpenShift

By : Denis Zuev, Artemii Kropachev, Aleksey Usov
Book Image

Learn OpenShift

By: Denis Zuev, Artemii Kropachev, Aleksey Usov

Overview of this book

Docker containers transform application delivery technologies to make them faster and more reproducible, and to reduce the amount of time wasted on configuration. Managing Docker containers in the multi-node or multi-datacenter environment is a big challenge, which is why container management platforms are required. OpenShift is a new generation of container management platforms built on top of both Docker and Kubernetes. It brings additional functionality to the table, something that is lacking in Kubernetes. This new functionality significantly helps software development teams to bring software development processes to a whole new level. In this book, we’ll start by explaining the container architecture, Docker, and CRI-O overviews. Then, we'll look at container orchestration and Kubernetes. We’ll cover OpenShift installation, and its basic and advanced components. Moving on, we’ll deep dive into concepts such as deploying application OpenShift. You’ll learn how to set up an end-to-end delivery pipeline while working with applications in OpenShift as a developer or DevOps. Finally, you’ll discover how to properly design OpenShift in production environments. This book gives you hands-on experience of designing, building, and operating OpenShift Origin 3.9, as well as building new applications or migrating existing applications to OpenShift.

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Table of Contents (24 chapters)
Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
Get in touch
Free Chapter
1
Containers and Docker Overview
Containers and Docker Overview
Technical requirements
Containers overview
Docker container architecture
Understanding Docker images and layers
Docker registries
Docker Hub overview
Docker installation and configuration
Using the Docker command line
Managing images using Docker CLI
Managing containers using Docker CLI
Using environment variables
Using persistent storage
Creating a custom Docker image
Summary
Questions
Further reading
2
Kubernetes Overview
Kubernetes Overview
Technical requirements
Container management systems overview
Kubernetes versus Docker Swarm
Kubernetes key concepts
Kubernetes installation and configuration
Working with kubectl
Clearing the virtual environment
Kubernetes limitations
Summary
Questions
Further reading
3
CRI-O Overview
CRI-O Overview
Technical requirements
Container Runtime and Container Runtime Interface
How CRI-O works with Kubernetes
Installing and working with CRI-O
Summary
Questions
Further reading
4
OpenShift Overview
OpenShift Overview
Cloud technology landscape and the role of PaaS
OpenShift as an extension of Kubernetes
Understanding OpenShift's business value
OpenShift flavors
OpenShift architecture
Summary
Questions
Further reading
5
Building an OpenShift Lab
Building an OpenShift Lab
Technical requirements
Why use a development environment?
Deployment variants
Working with oc cluster up
Working with Minishift
Working with Vagrant
Summary
Questions
Further reading
6
OpenShift Installation
OpenShift Installation
Technical requirements
Prerequisites
Overview of OpenShift installation methods
Environment preparation
Advanced installation
Summary
Questions
Further reading
7
Managing Persistent Storage
Managing Persistent Storage
Technical requirements
Persistent versus ephemeral storage
The OpenShift persistent storage concept
Storage backends comparison
Storage infrastructure setup
Configuring Physical Volumes (PV)
Using persistent storage in pods
Summary
Questions
Further reading
8
Core OpenShift Concepts
Core OpenShift Concepts
Managing projects in OpenShift
Managing users in OpenShift
Creating new applications in OpenShift
Managing pods in OpenShift
Managing services in OpenShift
Managing routes in OpenShift
Summary
Questions
Further reading
9
Advanced OpenShift Concepts
Advanced OpenShift Concepts
Technical requirements
Tracking the version history of images using ImageStreams
Separating configuration from application code using ConfigMaps
Controlling resource consumption using ResourceQuotas
Controlling resource consumption using LimitRanges
Creating complex stacks of applications with templates
Autoscaling your application depending on CPU and RAM utilization
Summary
Questions
Further reading
10
Security in OpenShift
Security in OpenShift
Technical requirements
Authentication
Authorization and role-based access control
Admission controllers
Security context constraints
Storing sensitive data in OpenShift
Summary
Questions
Further reading
11
Managing OpenShift Networking
Managing OpenShift Networking
Technical requirements
Network topology in OpenShift
SDN plugins
Egress routers
Static IPs for external project traffic
Egress network policies
DNS
Summary
Questions
Further reading
12
Deploying Simple Applications in OpenShift
Deploying Simple Applications in OpenShift
Technical requirements
Manual application deployment
Using oc new-app
Advanced deployment
Summary
Questions
Further reading
13
Deploying Multi-Tier Applications Using Templates
Deploying Multi-Tier Applications Using Templates
Technical requirements
OpenShift template overview
Creating a custom template
Using templates to deploy a multi-tier application
Summary
Questions
Further reading
14
Building Application Images from Dockerfile
Building Application Images from Dockerfile
Technical requirements
Dockerfile development for OpenShift
Building an application from Dockerfile
Dockerfile build customization
Summary
Questions
Further reading
15
Building PHP Applications from Source Code
Building PHP Applications from Source Code
Technical requirements
PHP S2I
Building a simple PHP application
Understanding the PHP build process
Summary
Questions
Further reading
16
Building a Multi-Tier Application from Source Code
Building a Multi-Tier Application from Source Code
Technical requirements
Building a multi-tier application
Summary
Questions
17
CI/CD Pipelines in OpenShift
CI/CD Pipelines in OpenShift
Technical requirements
CI/CD and CI/CD pipelines
Jenkins as CI/CD
Jenkins in OpenShift
Summary
Questions
Further reading
18
OpenShift HA Architecture Overview
OpenShift HA Architecture Overview
What is high availability?
HA in OpenShift
OpenShift backup and restore
Summary
Questions
Further reading
19
OpenShift HA Design for Single and Multiple DCs
OpenShift HA Design for Single and Multiple DCs
OpenShift single-DC HA design
OpenShift multi-DC HA design
Summary
Questions
Further reading
20
Network Design for OpenShift HA
Network Design for OpenShift HA
Common network topologies for OpenShift deployments
Commonly made mistakes while designing networks for OpenShift
General network requirements and design guidelines for OpenShift deployments
Summary
Questions
Further reading
21
What is New in OpenShift 3.9?
What is New in OpenShift 3.9?
Major changes in OpenShift 3.9
What to expect from the following OpenShift releases
Summary
Questions
Further reading
22
Assessments
Assessments
Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Chapter 9
Chapter 10
Chapter 11
Chapter 12
Chapter 13
Chapter 14
Chapter 15
Chapter 16
Chapter 17
Chapter 18
Chapter 19
Chapter 20
Chapter 21
23
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Technical requirements

This chapter relies on a working installation of OpenShift. We assume that OpenShift master's address is openshift.example.com and the default subdomain is example.com.

Some of the lab items require a custom DNS record, which can be simulated by setting a record in /etc/hosts. Both methods are acceptable.

You will be required to run minishift in this chapter, to avoid certain errors and reconfiguration you might be required to do with other openshift deployment methods.

$ minishift start --openshift-version=v3.9.0 --vm-driver=virtualbox --memory 4GB

...
output truncated for brevity
...
-- Minishift VM will be configured with ...
   Memory: 4 GB
   vCPUs : 2
   Disk size: 20 GB
...
output truncated for brevity
...
OpenShift server started.

The server is accessible via web console at:
    https://192.168.99.110:8443

You are logged in as:
    User: developer
    Password...
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