Kubernetes deployment strategies

If a change is required to horizontally scale an application by increasing the number of replicas or if a change is required to the application by updating the container image, then a change is required to the deployment specification in Kubernetes. This will lead to automatic updates, either resulting in deploying additional Pods to scale horizontally or deploying a new Pod with the updated image and replace the current running Pod.

Changes to deployment can either happen by applying an updated deployment spec or by editing an existing deployment or specifically updating the image on the deployment. All of these can be done through the kubectl commands. However, the strategy used to perform the deployment makes an immense difference in terms of how end users of the application are impacted. There are four specific deployment strategies. Each of these strategies offers a different use case. These are mentioned as follows and will be illustrated in...