Workloads

Understand Pods, the smallest deployable compute object in Kubernetes, and the higher-level abstractions that help you to run them.

A workload is an application running on Kubernetes. Whether your workload is a single component or several that work together, on Kubernetes you run it inside a set of Pods. In Kubernetes, a Pod represents a set of running containers on your cluster.

A Pod has a defined lifecycle. For example, once a Pod is running in your cluster then a critical failure on the node where that Pod is running means that all the Pods on that node fail. Kubernetes treats that level of failure as final: you would need to create a new Pod even if the node later recovers.

However, to make life considerably easier, you don't need to manage each Pod directly. Instead, you can use workload resources that manage a set of Pods on your behalf. These resources configure controllers that make sure the right number of the right kind of Pod are running, to match the state you specified.

Those workload resources include:

There are also two supporting concepts that you might find relevant:

What's next

As well as reading about each resource, you can learn about specific tasks that relate to them:

Once your application is running, you might want to make it available on the internet as a Service or, for web application only, using an Ingress.

You can also visit Configuration to learn about Kubernetes' mechanisms for separating code from configuration.

Last modified October 22, 2020 at 2:24 PM PST: Fix links in concepts section (070023b24)