$ kubectl create deployment nginx-deployment -image nginx -port=80 Now, let’s create a basic Kubernetes deployment showing both methods: 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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