Discover how to build, deploy, scale, and manage Kubernetes. Gain insights into architecture, pods, deployments, services, and run real-world projects to solidify your skills.

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Kubernetes in Practice is your one-stop shop for learning how to build, deploy, scale, and manage Kubernetes in a step-by-step process.

You will learn all the most important concepts including: architecture, pods, deployments, services, ingress, and a whole lot more. Once you have the fundamentals out of the way, you will get the opportunity to put your skills to work in a project where you will create and run an application in a real Kubernetes cluster.

By the time you finish this course, you will have complete confidence when it comes to deploying and managing kubernetes clusters.

Kubernetes in Practice

If we want to run this same application in multiple different environments, like `staging` and `production`, we would need to have two copies of this manifest just to change the value of these environment variables. This is one of the problems with embedding these environment variables in the manifest.

Luckily, Kubernetes has a high level resource called `ConfigMap` that serves this purpose. It's basically a place for us to store key-value pairs that can be injected into our containers when they run. Let's see an example.

# hellok8s-config.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: hellok8s-config
data:
  MESSAGE: "It works with a ConfigMap!"

Once again, it’s defined as a manifest file, and it’s as simple as it gets. It just needs a name and a list of keys with their respective values. In this case, we are defining a `ConfigMap` called `hellok8s-config` that defines a config called `MESSAGE` with the value `"It works with a ConfigMap!"`.

Let's now replace what we did in our manifest to make it use this `ConfigMap`:

Learn how we can use `ConfigMaps` in our applications.

Before We Begin

What Kubernetes Brings to the Table

Kubernetes Architecture

Pods

Deployments

Services

Deploying a Web Application over Kubernetes

Ingress

Configuring Applications with Configmaps

Using Secrets for Sensitive Configs

Running Jobs

Fault-Tolerant Web Hosting on Kubernetes

Organizing Resources with Namespaces

Managing Containers Resource Usage

Understanding the Kubeconfig File

Kubernetes IRL

Appendix

Wrap Up!

Extracting Configs to a ConfigMap

`ConfigMap`