Labeling and annotating the Pods
We will now discuss another key concept of Kubernetes: labels and annotations. Labels are key/value pairs that you can attach to your Kubernetes objects. Labels are meant to tag your Kubernetes objects with key/value pairs defined by you. Once your Kubernetes objects have been labeled, you can build a custom query to retrieve specific Kubernetes objects based on the labels they hold. In this section, we are going to discover how to interact with labels through kubectl by assigning some labels to our Pods.
What are labels and why do we need them?
Labels are key/value pairs that you can attach to your created objects, such as Pods. What label you define for your objects is up to you – there is no specific rule regarding this. These labels are attributes that will allow you to organize your objects in your Kubernetes cluster: once your objects have been labeled, you can list and query them using the labels they hold. To give you a very concrete...