Kubernetes Deployment YAML File with Examples

This article discusses the anatomy of a Kubernetes deployment YAML file, which is used to manage containerized applications in a Kubernetes cluster. Deployments are a fundamental building block for managing such applications and provide a declarative way to manage and scale a set of identical pods. The article covers various scenarios where deployments are used, including creating a ReplicaSet, declaring the new state of Pods, scaling up the Deployment, pausing rollouts, rolling back to an earlier Deployment revision, and monitoring the status of the Deployment. The Kubernetes Deployment YAML file is a configuration file written in YAML that defines the desired state of a Kubernetes Deployment. It contains key-value pairs specifying various attributes and settings for the Deployment, such as the number of replicas, pod template specifications, labels, and more. The article provides examples of basic YAML files for Kubernetes deployments and explains how to create, update, or delete Deployments using these files. The article also discusses various components of a typical Kubernetes Deployment YAML file, including apiVersion, kind, metadata, and spec. It covers the use of environment variables in deployment YAML files, as well as scenarios where not to use them. Additionally, it provides examples of deployments with multiple replicas, resource limits, health checks, persistent volumes, and affinity settings. Finally, the article introduces Spacelift, a platform that helps manage Kubernetes projects by automating, auditing, securing, and continuously delivering infrastructure. It highlights the benefits of using Spacelift for managing Kubernetes deployments and offers a free trial account to explore its features.