Following the declarative method will make it possible to use GitOps principles, where all configurations in Git are used as the only source of truth.Īs an added benefit, a later transition to popular tools like Helm and ArgoCD will go smoothly. Many developers can work on the same deployments and there is a clear history of who changed what. Every configuration is in a file and this file can be managed in Git. The declarative method, on the other hand, is self-documenting. It’s hard to see what’s changed when you’re managing deployments using imperative commands.
While the imperative method can be quicker initially, it definitely has some drawbacks. Declarative: Describe a desired deployment state in a YAML (or JSON) file and apply the deployment.Imperative: Use a CLI command to create a deployment.There are two ways to create a Kubernetes deployment. The possibility to rollback to an earlier revision of your deployment.Multiple strategies to deploy your application.High availability of your application (pods) by creating a ReplicaSets.If a pod goes down due to an interruption, the ReplicaSets controller will notice that the desired state does not match the actual state, and a new pod will be created. A deployment will create ReplicaSets which then ensures that the desired number of pods are running. In a deployment, you can describe the desired state for your application and Kubernetes will constantly check if this state is matched. Kubernetes deployments help to prevent this downtime. They can go down when an interruption occurs on the server, during a brief network problem, or due to a minimal memory issue-and it can bring down your entire application with it. Pods are ephemeral and not self-healing, which makes them fragile. Within Kubernetes, a container runs logically in a pod, which can be represented as one instance of a running service. Kubernetes is a container orchestration tool that helps with the deployment and management of containers.
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