Kubernetes for all!

Kubernetes for all!

January 13, 2020 - Christian Candelaria

if [[ “$ContainerKnowledge” = false ]]; then
echo “Read my blog: Docker & Containerselse
echo “Proceed and have fun!”
fi

You are here because you love containers or at least you are interested in the topic at hand. It is innovative, it is easy, it has several advantages and the best of all it is fun! Now I already managed 1, 2, 3, 4 until 5 containers by hand. (4 or 5 is already a bit tricky, believe me…) That said, I can’t imagine myself managing tons of containers manually. So guess what? Just automate it! Luckily there is a fun way to do it! Let me explain “Kuber…netes” or K8s in short (k + 8characters + s, ya dig?).

An introduction to K8s

K8s is an open source project that provides a platform designed to automate the deployment, scaling, and management of containerized applications. “Owkay!”, let’s break that in pieces before I cause you brain damage.

So what will K8s do for you? K8s will…

  • … scale your application horizontally on demand or automatically based on CPU usage.

“And the list goes on and on.”, FYI, it really has several other features like batch execution, service discovery, load balancing, secret and configuration management. Therefore, it is the prince for a container! “Hmmm”, maybe not a good comparison as the prince will manage more than 1 container. However… K8s is a good choice to schedule your container needs.

Here are a few facts in between to feed your brain:

  • K8s was originally developed by Google then donated to the Cloud Native Computing Foundation (CNCF).

Architecture

What does the bone structure of K8s look like? I wont tread into too much detail, but just stick to the tip of the iceberg. K8s consists of 1 or more master node(s) and 1 or more worker node(s). Tasks will first go to the master and the master node will schedule the task to the nodes. Just think about it as a master and slave principle (metaphorically). K8s can run on your choice of infrastructure: physical or virtual, private or public cloud and hybrid cloud infrastructure is also an option. You can interact with k8s on two ways via the CLI tool or the GUI. Just to mention if you are a real engineer, then: “You will use the CLI!”.

That said, K8s is not the only option for container management. The alternatives are just not commonly used so for now let’s just stick with K8s. Also, K8s is an open source community where engineers, from companies all over the world including Google and Redhat, are actively contributing to the project. Based on that, just contribute and let us work together for the future!

Getting started with Kubernetes (Centos 7)

Here is a little fun/easy way to create your first (or last) Kubernetes cluster.

In this tutorial we will use “kind” (Kubernetes in Docker). Have fun!

#Install Kind
curl -Lo ./kind https://github.com/kubernetes-sigs/kind/releases/download/v0.6.1/kind-$(uname)-amd64
chmod +x ./kind
mv ./kind /some-dir-in-your-PATH/kind#Install Docker
yum install docker -y
systemctl start docker#Create Cluster
kind create cluster#Delete Cluster
kind delete cluster

Kubernetes is love, Kubernetes is life

Long story short: your container troubles are over. K8s is a fun and easy way to automate your processes. It’s an extraordinary project that, maybe above all, is completely free and open source! Oh, how easy life can be…

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