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Index
Title Page
Copyright and Credits
Learn OpenShift
Packt Upsell
Why subscribe?
PacktPub.com
Contributors
About the authors
Acknowledgments
About the reviewers
Packt is searching for authors like you
Preface
Who this book is for
What this book covers
To get the most out of this book
Download the example code files
Download the color images
Conventions used
Get in touch
Reviews
Containers and Docker Overview
Technical requirements
Containers overview
Container features and advantages
Efficient hardware resource consumption
Application and service isolation
Faster deployment
Microservices architecture
The stateless nature of containers
Docker container architecture
Docker architecture
Docker's main components
Linux containers
Understanding Docker images and layers
Container filesystem
Docker storage drivers
Container image layers
Docker registries
Public registry
Private registry
Accessing registries
Docker Hub overview
Docker installation and configuration
Docker installation
Docker configuration
Using the Docker command line
Using Docker man, help, info
Managing images using Docker CLI
Working with images
Saving and loading images
Uploading images to the Docker registry
Managing containers using Docker CLI
Docker ps and logs
Executing commands inside a container
Starting and stopping containers
Docker port mapping
Inspecting the Docker container
Removing containers
Using environment variables
Passing environment variables to a container
Linking containers
Using persistent storage
Creating a custom Docker image
Customizing images using docker commit
Using Dockerfile build
Using Docker history 
Dockerfile instructions 
Summary
Questions
Further reading
Kubernetes Overview
Technical requirements
Container management systems overview
Kubernetes versus Docker Swarm
Kubernetes key concepts
Kubernetes installation and configuration
Working with kubectl
Getting help
Using the kubectl get command
Running Kubernetes pods
Describing Kubernetes resources 
Editing Kubernetes resources
Exposing Kubernetes services
Using Kubernetes labels
Deleting Kubernetes resources
Kubernetes advanced resources
Creating kubernetes services using YAML and JSON files
Clearing the virtual environment
Kubernetes limitations
Summary
Questions
Further reading
CRI-O Overview
Technical requirements
Container Runtime and Container Runtime Interface
CRI-O and Open Container Initiative
How CRI-O works with Kubernetes
Installing and working with CRI-O
Stopping your virtual environment
Summary
Questions
Further reading
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
Building an OpenShift Lab
Technical requirements
Why use a development environment?
Deployment variants
Working with oc cluster up
System requirements and prerequisites
CentOS 7
macOS
Windows
Accessing OpenShift through a web browser
Working with Minishift
Working with Vagrant
Vagrant installation
Installing OpenShift with an all-in-one Vagrant box
Summary
Questions
Further reading
OpenShift Installation
Technical requirements
Prerequisites
Hardware requirements
Overview of OpenShift installation methods
RPM installation
Containerized installation
Deployment scenarios
Environment preparation
Docker
SELinux
Ansible installation
SSH access
Advanced installation
OpenShift Ansible inventory
OpenShift Ansible playbooks
Installation
Validation
Summary
Questions
Further reading
Managing Persistent Storage
Technical requirements
Persistent versus ephemeral storage
The OpenShift persistent storage concept
Persistent Volumes
Persistent Volume Claims
The storage life cycle in OpenShift
Storage backends comparison
Storage infrastructure setup
Setting up NFS
Installing NFS packages on the server and clients
Configuring NFS exports on the server
Starting and enabling the NFS service
Verification
Configuring GlusterFS shares
Installing packages
Configuring a brick and volume
Configuring iSCSI
Client-side verification
NFS verification
GlusterFS verification
iSCSI verification
Configuring Physical Volumes (PV)
Creating PVs for NFS shares
Creating a PV for the GlusterFS volume
PV for iSCSI
Using persistent storage in pods
Requesting persistent volume
Binding a PVC to a particular PV
Using claims as volumes in pod definition
Managing volumes through oc volume
Persistent data for a database container
Summary
Questions
Further reading
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
Advanced OpenShift Concepts
Technical requirements
Tracking the version history of images using ImageStreams
Importing images
Creating applications directly from Docker images
Manually pushing images into the internal registry
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
CPU-based autoscaling
Memory-based autoscaling
Summary
Questions
Further reading
Security in OpenShift
Technical requirements
Authentication
Users and identities
Service accounts
Identity providers
AllowAll
DenyAll
HTPasswd
LDAP
Authorization and role-based access control
Using built-in roles
Creating custom roles
Admission controllers
Security context constraints
Storing sensitive data in OpenShift
What data is considered sensitive?
Secrets
Summary
Questions
Further reading
Managing OpenShift Networking
Technical requirements
Network topology in OpenShift
Tracing connectivity
SDN plugins
ovs-subnet plugin
ovs-multitenant plugin
ovs-networkpolicy plugin
Egress routers
Static IPs for external project traffic
Egress network policies
DNS
Summary
Questions
Further reading
Deploying Simple Applications in OpenShift
Technical requirements
Manual application deployment
Creating a pod
Creating a service
Creating a service using oc expose
Creating a service from a YAML definition
Creating a route
Creating a route by using oc expose
Creating a route from a YAML definition
Using oc new-app
The oc new-app command
Using oc new-app with default options
Advanced deployment
Deploying MariaDB
Summary
Questions
Further reading
Deploying Multi-Tier Applications Using Templates
Technical requirements
OpenShift template overview
Template syntax
Adding templates
Displaying template parameters
Processing a template
Creating a custom template
Developing YAML/JSON template definitions
Exporting existing resources as templates
Using the oc new-app -o command
Using templates to deploy a multi-tier application
The Gogs application template
Creating the Gogs application
Summary
Questions
Further reading
Building Application Images from Dockerfile
Technical requirements
Dockerfile development for OpenShift
Building an application from Dockerfile
A simple Dockerfile build
Dockerfile build customization
Summary
Questions
Further reading
Building PHP Applications from Source Code
Technical requirements
PHP S2I
Building a simple PHP application
Understanding the PHP build process
Starting a new build
Summary
Questions
Further reading
Building a Multi-Tier Application from Source Code
Technical requirements
Building a multi-tier application
WordPress template
Building a WordPress application
Summary
Questions
CI/CD Pipelines in OpenShift
Technical requirements
CI/CD and CI/CD pipelines
Jenkins as CI/CD
Jenkins in OpenShift
Creating Jenkins pipelines in OpenShift
Starting a Jenkins pipeline
Editing Jenkinsfile
Managing pipeline execution
Summary
Questions
Further reading
OpenShift HA Architecture Overview
What is high availability?
HA in OpenShift
Virtual IPs
IP failover
OpenShift infrastructure nodes  
OpenShift masters 
OpenShift etcd
OpenShift nodes  
External storage for OpenShift persistent data
OpenShift backup and restore
Etcd key-value store backup
OpenShift masters 
OpenShift nodes 
Persistent storage  
Summary
Questions
Further reading
OpenShift HA Design for Single and Multiple DCs
OpenShift single-DC HA design
OpenShift infrastructure nodes
OpenShift masters
OpenShift nodes
Etcd key-value store
Persistent storage
Physical placement consideration
Design considerations
OpenShift multi-DC HA design
One OpenShift cluster across all data centers
One OpenShift cluster per data center
Networking
Storage
Application deployment
Summary
Questions
Further reading
Network Design for OpenShift HA
Common network topologies for OpenShift deployments
Data center networks
Access layer switches
Core layer switches
Edge firewalls
Load balancers
Border routers
Cloud networks
SDN
Security groups
Load balancers
Network Address Translation (NAT) gateways
Commonly made mistakes while designing networks for OpenShift
General network requirements and design guidelines for OpenShift deployments
Summary
Questions
Further reading
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
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
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