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A Practical Guide to Kubernetes

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How Did We Get Here?

Introduction A Short History of Infrastructure Management A Short History of Deployment Processes The Schedulers What is Kubernetes?

Running a Kubernetes Cluster Locally

Exploring the Options Installing kubectl Installing Minikube Creating a Local Kubernetes Cluster with Minikube Exploring Minikube Commands Quick Quiz!What's Next?

Pods

Getting Started with Pods A Quick and Dirty Way to Run Pods Defining Pods through Declarative Syntax Components and Stages Involved in a Pod's Scheduling Playing Around with the Running Pod Running Multiple Containers in a Single Pod Single vs. Multi-Container Pods Monitoring Health Quick Quiz What's Next?

ReplicaSets

Getting Started with ReplicaSets Creating ReplicaSets Sequential Breakdown of the Process Operating ReplicaSets Quick Quiz!What's Next?

Services

Getting Started with Communication Creating Services by Exposing Ports Sequential Breakdown of the Process Creating Services through Declarative Syntax Splitting the Pod and Establishing Communication through Services Creating the Split API Pods Defining Multiple Objects in the Same YAML file Discovering Services Quick Quiz!What's Next?Comparison with Docker Swarm

Deployments

Getting Started with Deploying Releases Deploying New Releases Sequential Breakdown of the Process Updating Deployments Defining a Zero-Downtime Deployment Creating a Zero-Downtime Deployment Rolling Back or Rolling Forward?Playing around with the Deployment Rolling Back Failed Deployments Merging Everything into the Same YAML Definition Updating Multiple Objects Scaling Deployments Quick Quiz!What's Next?Comparison with Docker Swarm

Ingress

Getting Started with Ingress Why Services Are Not the Best Fit for External Access?Enabling Ingress Controllers Creating Ingress Resources Based on Paths Sequential Breakdown of the Process Creating Ingress Resources Based on Domains Creating an Ingress Resource with Default Backend Quick Quiz!What's Next?Comparison with Docker Swarm

Volumes

Getting Started with Volumes Accessing Host’s Resources through hostPath Volumes Running the Pod after mounting hostPath Using hostPath Volume Type to Inject Configuration Files Working with the New Prometheus Configuration Using gitRepo To Mount a Git Repository Non-Persisting State Persisting State through the emptyDir Volume Type Quick Quiz!What's Next?

ConfigMaps

Getting Started with ConfigMaps

Injecting Configuration from a Single File

Injecting Configurations from Multiple Files

Injecting Configurations from Key/Value Literals

Injecting Configurations from Environment Files

Converting ConfigMap Output into Environment Variables

Defining ConfigMaps as YAML

A Plea NOT to Use ConfigMaps!

Comparison with Docker Swarm

Secrets

Getting Started with Secrets Exploring Built-In Secrets Creating Generic Secrets Mounting Generic Secrets Secrets Compared to ConfigMaps Not so Secretive Secrets Quick Quiz!What's Next?Comparison with Docker Swarm

Namespaces

Getting Started with Cluster Division Deploying the First Release Exploring Virtual Clusters Exploring the Existing Namespaces Creating a New Namespace Deploying to a New Namespace Communicating between Namespaces Deleting a Namespace and All Its Objects Quick Quiz!What's Next?Comparison with Docker Swarm

Securing Kubernetes Clusters

Getting Started with Security Accessing Kubernetes API Authorizing Requests and Creating a Cluster Creating Users to Access the Cluster Accessing the Cluster as a User Exploring RBAC Authorization Peeking into Pre-Defined Cluster Roles Creating Role Bindings Creating Cluster Role Bindings Combining Role Bindings with Namespaces Granting Access as a Release Manager Replacing Users With Groups Quick Quiz!What's Next?Comparison with Docker Swarm

Managing Resources

Getting Started with Managing Resources Defining Container Memory and CPU Resources Getting Practical with Container Memory and CPU Resources Measuring the Actual Memory and CPU Consumption Allocating Insufficient Resource than the Actual Usage Allocating Excessive Resource than the Actual Usage Adjusting Resources Based on Actual Usage Exploring Quality of Service (QoS) Contracts Examining QoS in Action Defining Resource Defaults and Limitations within a Namespace The Mismatch Scenario Defining Resource Quotas for a Namespace Exploring the Effects by Violating Quotas Exploring the Types of Quotas Quick Quiz!What's Next?Comparison with Docker Swarm

Creating A Production-Ready Kubernetes Cluster

Getting Started with Production-Ready Clusters Kubernetes Operations (kops) Project Preparing for the Cluster Setup: AWS CLI and Region Preparing for the Cluster Setup: IAM Group and User Preparing for the Cluster Setup: Availability Zones and SSH Keys Creating a Cluster: Creating S3 Bucket and Installing kops Creating a Cluster: Discussing the Specifications Creating a Cluster: Running and Verification Exploring the Components That Constitute the Cluster Updating the Cluster Sequential Breakdown and Verification of the Update Process Upgrading the Cluster Manually: Changing the Kubernetes Version Upgrading the Cluster Manually: Exploring and Verifying the Output Upgrading the Cluster Automatically Accessing the Cluster: Understanding the Protocol Accessing the Cluster: Adding the Load Balancer Deploying Applications Exploring the High-Availability and Fault-Tolerance Giving Others Access to the Cluster Destroying the Cluster Quick Quiz!What's Next?Comparison with Docker Swarm

Persisting State

Getting Started with State Persistance Deploying Stateful Applications without Persisting State Analyzing Failure of the Stateful Application Creating AWS Volumes Creating Kubernetes Persistent Volumes Claiming Persistent Volumes Creating Deployment for Attaching Claimed Volumes to Pods Verifying the State Persistence and Exploring the Failures Removing the Resources and Exploring the Effects Using Storage Classes to Dynamically Provision Persistent Volumes Using Default Storage Classes Defining Storage Classes Creating Storage Classes Quick Quiz!What's Next?

What's Next?

We'll cover the following

- Summary
- Destroying Everything
- Next

Summary

In this chapter, we explore ConfigMaps and learned to inject configurations from various sort of sources including single files, multiple files, literals and environment files. We also discussed the ways of configuring your applications.

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