If you have already used Docker Swarm, the logic behind Kubernetes Deployments should be familiar. Both serve the same purpose and can be used to deploy new applications or update those that are already running inside a cluster. In both cases, we can easily deploy new releases without any downtime (when application architecture permits that).
Unlike the previous comparison between Kubernetes Pods, ReplicaSets, and Services with Docker Swarm Stacks, Kubernetes Deployments do provide a few potentially important functional differences. But, before we dive into the functional comparison, we'll take a moment to explore differences in how we define objects.
An example Kubernetes Deployment and Service definition is as follows:
apiVersion: apps/v1beta2
kind: Deployment
metadata:
name: go-demo-2-db
spec:
selector:
matchLabels...