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Kubernetes Deployment

Everyone running applications on Kubernetes cluster uses a deployment. It’s what you use to scale, roll out, and roll back versions of your applications. With a deployment, you tell Kubernetes how many copies of a Pod you want running. The deployment takes care of everything else.

What is a Deployment?

A deployment is an object in Kubernetes that lets you manage a set of identical pods. Without a deployment, you’d need to create, update, and delete a bunch of pods manually. With a deployment, you declare a single object in a YAML file. This object is responsible for creating the pods, making sure they stay up to date, and ensuring there are enough of them running You can also easily autoscale your applications using a Kubernetes deployment.

Deployment vs service

What’s the difference between a deployment and a service?
A deployment is used to keep a set of pods running by creating pods from a template. A service is used to allow network access to a set of pods. Both services and deployments choose which pods they operate on using labels and label selectors. This is where the overlap is. You can use deployments independent of services. You can use services independent of deployments. They just go together really nicely!

This lets you do canary deployments. You add a new deployment version of a pod and run it alongside your existing deployment, but have both deployments handle requests to the service. Once deployed, you can verify the new deployment on a small proportion of the service's traffic, and gradually scale up the new deployment while decreasing the old one.

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Modern software development is all about customization. Customized methodologies that enable development and delivery have essentially overtaken the unified feature-rich model of conventional waterfall development. Customized deployment has changed the character and power of software development in unexpected ways. As the process of customization evolves, it incorporates continuous integration, continuous delivery, and continuous deployment.