Once deployed, you can verify the new deployment on a small proportion of the service's traffic, and gradually scale up the new deployment while decreasing the old one. You add a new deployment version of a pod and run it alongside your existing deployment, but have both deployments handle requests to the service. You can use services independent of deployments. You can use deployments independent of services. What’s the difference between a deployment and a service?Ī deployment is used to keep a set of pods running by creating pods from a template.Ī service is used to allow network access to a set of pods.īoth services and deployments choose which pods they operate on using labels and label selectors. In this case, the deployment will create pods that run nginx-hostname and with the configured labels. So everything under the template key is a regular pod specification. When the deployment creates pods, it will create them using this template! It’s essentially a pod template jammed inside our deployment spec. This essentially says 'all the pods matching these labels are grouped in our deployment.' Next, we use a label selector to tell the deployment which pods are part of the deployment. (You can ignore the additional comments about the 'service' here – this deployment was taken from a different example that also incorporated services.)įirst, the replicas key sets the number of instances of the pod that the deployment should keep alive. (Scroll down for code that can be copy-and-pasted.) Here’s some YAML that you can use as a template for creating your deployments.įirst, take a look at the animation that annotates each section of the deployment YAML. You can also easily autoscale your applications using a Kubernetes deployment. This object is responsible for creating the pods, making sure they stay up to date, and ensuring there are enough of them running With a deployment, you declare a single object in a YAML file. Without a deployment, you’d need to create, update, and delete a bunch of pods manually. The deployment takes care of everything else.Ī deployment is an object in Kubernetes that lets you manage a set of identical pods. With a deployment, you tell Kubernetes how many copies of a Pod you want running. It’s what you use to scale, roll out, and roll back versions of your applications. Kubernetes Deployment Tutorial with Example YAMLĮveryone running applications on Kubernetes cluster uses a deployment.

What is kubernetes manifest