These next steps provide a simple introduction to the idea of putting two containers in a Pod to achieve the sidecar pattern. The primary advantage of sidecars is a separation of concerns. Each container is highly cohesive in terms of responsibilities, yet they work together to provide a single solution.

With a Kubernetes cluster and a CLI tool called kubectl, a few steps will get an NGINX web server running along with its sidecar.

In this lab, you will learn how to:

    ☐ Use the basics of the kubectl CLI tool
    ☐ Install NGINX on Kubernetes
    ☐ Deploy containers as Deployments in Pods
    ☐ Use a Service to access to replications of Pods
    ☐ Combine two containers into a Pod
    ☐ Share information beetween containers in a Pod

NGINX is a web server which can also be used as a reverse proxy, load balancer, mail proxy, and HTTP cache. The software was created by Igor Sysoev and first publicly released in 2004. A company of the same name was founded in 2011 to provide support and NGINX plus paid software.

NGINX is free and open-source software, released under the terms of a BSD-like license. A large fraction of web servers leverage NGINX, often as a load balancer. – Wikipedia