5, we’ve moved the feature formerly known as PetSet into beta as StatefulSet. The deployment is made up of 2 Nginx web servers; both of them are connected to a persistent volume. spec. Each Pod in a StatefulSet derives its hostname from the name of the StatefulSet and the ordinal of the Pod. First, do a git pull to ensure you’re working on the latest revision: $ git pull origin setup-semaphore. I'll try removing some parts of the alertmanager deployment to identify the issue. To learn about how to configure probes in Kubernetes,. Each StatefulSet domain will work as a DNS subdomain depending on the configuration of DNS for a Cluster. func NewForConfigAndClient (c * rest. kubectl get pods NAME READY. Stable Network ID. If you look at web_stateful. Each object in your cluster has a Name that is unique for that type of resource. This means that each Pod in a StatefulSet has a stable network identity and persistent storage, which are essential for. This page shows you how to run a single-instance stateful application in Kubernetes using a PersistentVolume and a Deployment. yaml storageclass. This ensures it’ll be postgres-2 that’s destroyed first. If you look at web_stateful. First, the (1) pod comes up, initialized, and then settles into a “ready” state. This article describes how to create, update, and delete StatefulSets, which are used to maintain the state of an application beyond a pod lifecycle in an Azure Kubernetes Serice deployment in AKS hybrid. In contrast, annotations are not used to identify and select objects. The . On deployment level it is not possible, but there is an option to do this indirectly. 每个pod都有自己存储，所以都用volumeClaimTemplates，为每个pod都生成一个自己的存储，保存自己的状态 3. This contains fields that maybe updated both. Statefulset vs Deployment in k8s. Pods created as part of a StatefulSet are given persistent identifiers that they retain even when they’re rescheduled. schedulerName field of the DaemonSet. StatefulSet. The node does not have control over the placement. A Pod's contents are always co-located and co-scheduled, and run in a. StatefulSets also enforce that Pods are removed in reverse order of their creation. The execution of a Pod depends on other ordinal index. Of course, the scaling depends on the app you are deploying. The example above will create three Pods named web-0,web-1,web-2. In Elasticsearch, deployment is in clusters. 5 or later. This page shows how to delete Pods which are part of a stateful set, and explains the considerations to keep in mind when doing so. template. For example, caching services are often limited by memory. If your application is stateless, you should use Deployment and not StatefulSet. I tested this on kubernetes 1. The most basic difference is that you would get ability to persist pod level state with statefulsets. One pod should be able to reach other pods with well-defined names. That's it! With these two commands, you have launched all the components required to run an highly available and redundant MongoDB replica set. The. 9. If we need to update the application to a new version, we can change the fields in the Deployment YAML file. Statefulsets. Unlike a Deployment, a StatefulSet maintains a sticky identity for each of their Pods. Currently the StatefulSets support only two kinds of update strategies:. StatefulSets manage the creation, scaling, and deletion of pods. Each pod runs specific containers, which are defined in the spec. Moreover, if at any point one of the replicas fails to start, the whole process will stop. Ordering: Kubernetes StatefulSet ensures that each pod is created in a specific order, while Deployment does not. Statefulset es un recurso que controla y gestiona en kubernetes uno o más Pods, pero entonces por qué no usar un Deployment te estarás preguntando?, entonces antes de continuar es mejor. Nota: Los StatefulSets son estables (GA) en la versión 1. deployment vs. StatefulSet Kubernetes | Understand what StatefulSet in Kubernetes is and how it worksUsing StatefulSet in practice 🙅🏼♀️ create the MongoDB replica set, run these two commands: kubectl apply -f googlecloud\_ssd. These are normally used instead of ReplicaSets as they are more flexible and creating a Deployment results in. To deploy the PostgreSQL cluster, we will create a dedicated namespace named database. In addition to kubectl rollout restart deployment, there are some alternative approaches to do this: 1. StatefulSets are designed to run stateful applications in Kubernetes with dedicated persistent storage. Deleting a StatefulSet You can delete a StatefulSet in the same way you delete other resources in Kubernetes: use the kubectl delete command, and specify the StatefulSet. podManagementPolicy. The solution(s) : Use a StatefulSet, ReplicaSet or DaemonSet to ensure the Pod creation after a Node failure. io to host its container images. Like a Deployment, a StatefulSet manages Pods based on an identical container specification. In a stateful containerized application, data must be persistent, retained and easy to access outside the application. Each Pod in a StatefulSet derives its hostname from the name of the StatefulSet and the ordinal of the Pod. 0. The three most common are: Rolling update strategy: Minimizes downtime at the cost of update speed. updateStrategy. Por ejemplo, si creamos un StatefulSet. It manages the deployment and scaling of a set of Pods, and provides guarantee about. Before you begin This task assumes you have an application running on your cluster represented by a StatefulSet. A DaemonSet is a unique kind of resource that K8s assigns to a pod for each Kubernetes node in the cluster. StatefulSet también es un controlador, pero a diferencia del deployment, no crea ReplicaSet sino que crea el Pod directamente con una nomenclatura única. Since the two are packaged in mongo-statefulset. In contrast to that, the Pods deployed by StatefulSet component are NOT identical and deployment is more complex. Because the replicas field of the zk StatefulSet is set to 3, the Set's controller creates three Pods with their hostnames set to zk-0, zk-1, and zk-2. To update a StatefulSet, you can use kubectl, the Kubernetes API, or the GKE Workloads menu in the Google Cloud console. Un StatefulSet es el objeto de la API workload que se usa para gestionar aplicaciones con estado. Expose MySQL to other pods in the cluster at a known DNS name. But it differs from a Deployment in that it is more suited for stateful apps. Just as a node is a compute resource used by the cluster, a PV is a storage resource. Run a Stateless Application Using a Deployment; Run a Single-Instance Stateful Application; Run a Replicated Stateful Application; Scale a StatefulSet; Delete a. Deploying a Stateful Application Using Kubernetes Statefulset. All of the other parts are ready and we will just plug in the engine and we will be ready to hit the road. kubectl delete sts --cascade=orphan <name> to delete the StatefulSet and leave its pods. Deployment. I assume that you need this for a stateful workload, a workload that e. schedulerName field of the DaemonSet. Kind of like a watch dog. spec. But many times, due to some requirements, users make sure that the pods are deployed in order with persistent storage volume and. In order to demonstrate the basic features of a. You should use a HorizontalPodAutoscaler (HPA for short): HPA automatically updates a workload resource (such as a Deployment or StatefulSet), with the aim of automatically scaling the workload to match demand. Without dynamic provisioning, cluster administrators have to manually make calls to their cloud or storage provider to create new storage volumes, and then create PersistentVolume objects to represent them in Kubernetes. To check the version, use the kubectl version command. spec. 3. In the above YAML file, we have defined a simple StatefulSet to deploy a PostgreSQL database. yml Verifying the replica set deployment and accessing the replica set. To get the name just read the environment variable HOSTNAME. To check your version of Kubernetes, run kubectl version. kuard-0 kuard-1 kuard-2. Object Names and IDs. Apr 6, 2020 at 8:53. spec. Configuring the YAML for a DeploymentDeployment or ReplicaSet may be better suited to your stateless needs. PersistentVolumes. However, the order matters in a StatefulSet, and K8s will maintain that order when scaling up or down to ensure stability. moury~ % kubectl scale statefulset web --replicas=3 statefulset. Node affinity allows a pod to specify an affinity (or anti-affinity) towards a group of nodes it can be placed on. Deployment and StatefulSet are two of the most popular and powerful features of Kubernetes. Running K8s on a single node is not a good idea if you want to build in fault. First, the (1) pod comes up, initialized, and then settles into a “ready” state. StatefulSet is the workload API object used to manage stateful applications. $ kubectl exec -it test-deployment-54d954d7f-2b582 sh / $ ps PID USER TIME COMMAND 1 2000 0:00 sleep 1h 6 2000 0:00 sh 11 2000 0:00 ps / $ whoami whoami: unknown uid 200 Share. kubectl apply -f <name> to recreate the StatefulSet. Unlike deployments, statefulset maintains an identity for each of the pods. StatefulSet workloads. Let’s look at the StatefulSet, step-by-step. Define the application in YAML format using kind: StatefulSet. StatefulSet and Deployment both aim to maximise availability, however StatefulSet is constrained by its inability to. Moreover, if at any point one of the replicas fails to start, the whole process will stop. We are creating a StatefulSet called postgresql-db with two pods (replicas: 2). DaemonSets. In this case our Canary Deployment has two replicas so approximately 16% of traffic will be sent to the canary because `(2/(2+10) = 2/12 ~ 16%)]`. 5 In the latest release, Kubernetes 1. Here's an example how this notation can be used to describe the deployment of an application. Statefulsets. However, the best practice would be to separate the environment variables using ConfigMaps and call the ConfigMap from the StatefulSet deployment. Scaling a StatefulSet refers to increasing or decreasing the number of replicas. In order to save confidential data one can use a K8s resource called Secret. A StatefulSet lets you manage one or more Pods – all running the same application code – where the Pods rely on having a distinct identity. Kubernetes has become the de-facto orchestration tool and initially it was supporting stateless applications, but stateful (data-driven) applications are very common and are critical to almost all the businesses. This topic was automatically closed 28 days after the. PersistentVolumes and StatefulSets are the main approaches for running stateful applications in Kubernetes. A StatefulSets are Kubernetes objects used to consistently deploy stateful application components. The StatefulSet, typically used to manage stateful applications, manages the deployment and scaling of a set of Pods, and provides guarantees about the ordering and uniqueness of these Pods. Deployment では、全てのPodで1個のPV をマウントしている違いがあります. A Kubernetes StorageClass is a Kubernetes storage mechanism that lets you dynamically provision persistent volumes (PV) in a Kubernetes cluster. All the examples available are showing Redis cluster being deployed as a combination of Kubernetes’ StatefulSets and PersistentVolumes. A stateful application requires pods with a unique identity (for example, hostname). A Deployment manages multiple pods by automating the creation, updating, and deletion of ReplicaSets. As a result, when the deployment starts to scale, unready applications might receive traffic. StatefulSetではこれを防ぐために、kubeletが落ちても新たにPodの自動起動をしない。 言い換えると、Podを手動で削除しない限り、新たなPodは起動されない。 Podを自動で起動してほしい場合. How to Set Up a Kubernetes MySQL Deployment with Cloud Volumes ONTAP. En esta entrada vamos a tratar sobre aplicaciones Stateful en Kubernetes – Statefulset, el cual es un tipo de recurso que nos ofrece Kubernetes. 2. service没有ClusterIP，是headlessservice，所以无法负载均衡，返回的都是pod名，所以pod名字都. 安定したネットワーク識別子. StatefulSet est l'objet de l'API de charge de travail utilisé pour gérer des applications avec état (stateful). The Deployment creates a ReplicaSet that creates three replicated Pods, indicated by the. In Kubernetes, a Service is a method for exposing a network application that is running as one or more Pods in your cluster. StatefulSetには以下のような特徴がある。. This document describes ephemeral volumes in Kubernetes. Refer to the StatefulSet (redis-cluster. This post talks about recent updates to the DaemonSet and StatefulSet API objects for Kubernetes. It allows you to define the Kubernetes Deployment or StatefulSet that you want KEDA to scale based on a scale trigger. service没有ClusterIP，是headlessservice，所以无法负载均衡，返回的都是pod名，所以pod名字都. Check. On the 3rd of April 2023, the old registry k8s. StatefulSet is also a Controller but unlike Deployments, it doesn’t create ReplicaSet rather itself. A StatefulSet is a controller that helps you deploy and scale groups of Kubernetes pods. Like a Deployment, a StatefulSet manages Pods that are based on an identical container spec. yaml kubectl apply -f mongo-statefulset. You can also create Pods (containers. replicas field. k8s. If your application needs to be brought up in a specific order, use statefulset. I want to deploy a single Pod on a Node to host my service (like GitLab for the example). g. This page shows how to delete Pods which are part of a stateful set, and explains the considerations to keep in mind when doing so. For example, web1, web2, web3 and web4, for a. In this article. pods. DaemonSet Kubernetes has several ways to deploy applications, including deployments, DaemonSets and StatefulSets. See StatefulSet vs. We like to dynamically assign a value (that's derived from the ordinal index) to the pod's label and later. 5 minute delay getting. A ReplicaSet ensures that a specified number of pod replicas are running at any given time. This behavior doesn't apply when the entire StatefulSet is deleted and can be disabled by setting a StatefulSet's . Deployment is a good fit for managing a stateless application workload on your cluster, where any Pod in the Deployment is interchangeable and can be replaced if needed. When using Kubernetes, most of the time you don’t care how your pods are scheduled, but sometimes you care that pods are deployed in order, that they have a persistent storage volume, or that they have a unique, stable network identifier across. Deployment vs Statefulset. . Gère le déploiement et la mise à l'échelle d'un ensemble de Pods, et fournit des garanties sur l'ordre et l'unicité de ces Pods. イメージ的にはPodTemplateを持つDeploymentにPVCも追加した感じ。. Compare Kubernetes StatefulSet vs. Now that we have the ordinal index, we can use if for selecting the configuration. Unlike a Deployment, a StatefulSet. This document describes the concept of a StorageClass in Kubernetes. The StatefulSet manifest should feel familiar—it looks a lot like a Deployment manifest! Instead of the volume field under a Deployment’s template spec, we define a VolumeClaimTemplate under the overall StatefulSet spec to describe how the workload will consume storage. Deployment. Oct 12, 2020 Deployments vs StatefulSets in Kubernetes Deployments vs StatefulSets TL;DR Deployments are usually used for stateless applications while StatefulSets are used for stateful. The command and arguments that you define in the configuration file override the default command and arguments provided by the container image. Like a Deployment, a StatefulSet manages Pods that are based on an identical container spec. As the name suggest the statefulsets are specifically used to make sure the app state is saved by each running pod. Secrets in K8s. 其實是分別由以下三種資訊所組成：. There is an entry for resources in my statefulset yaml and CPU limit is set to 1 and request to 0. 8 min read. Kubernetes Replication Controller vs Deployment Deployments are intended to replace Replication Controllers. A Kubernetes StorageClass is a Kubernetes storage mechanism that lets you dynamically provision persistent volumes (PV) in a Kubernetes cluster. requires writes. We have now logged into the MySQL database. #Deployment vs. If you are unsure about whether. By interpreting the documentation, it seems that it depends on the event. Deployment. You might set the Deployment to have replicas: 3 so that if one of them fails the other two can pick up the load. If the StatefulSet is scaled down to one replica, mysql-3 is guaranteed to exit first, followed by mysql-2. When a StatefulSet's . kubectl rollout restart sts <name> to restart the pods, one at a time. Statefulset vs Deployment; StatefulSet and Deployment are both Kubernetes resources used for managing containerized applications, but they differ in. Kubernetes provides a basic resource called Pod. Kubernetes administrators define classes of storage, and then pods can dynamically request the specific type of storage they need. Run a Stateless Application Using a Deployment; Run a Single-Instance Stateful Application; Run a Replicated Stateful Application; Scale a StatefulSet; Delete a StatefulSet; Force Delete StatefulSet Pods; Horizontal Pod Autoscaling; HorizontalPodAutoscaler Walkthrough; Specifying a Disruption Budget for your. In this article, we’ll take a look at the differences between Deployment and StatefulSet and when you. Need to understand exactly how patch works. The StatefulSet name is derived from the Elasticsearch resource name and the NodeSet name. StatefulSets maintain the state of applications beyond an individual pod lifecycle. It is mainly designed to use for stateful apps. apiVersion: apps/v1 kind: StatefulSet metadata: name: web # this will be used as prefix in pod name spec: serviceName: "nginx" replicas: 2 # specify number of pods that should be running selector: matchLabels: app: nginx template: metadata: labels: app: nginx spec:. E. This is the resource KEDA will scale up/down and setup an HPA for, based on the triggers defined in triggers:. It tries to ensure that the specified number of Pods from ordinal 0 through N-1 are alive and ready. fluentd-elasticsearch namespace: kube-system labels: k8s-app: fluentd-logging spec: selector: matchLabels: name. Pods are the smallest deployable units of computing that you can create and manage in Kubernetes. DeploymentはRollingUpdateとParallelの2つのストラテジーがあります。Instead of using a nodeAffinity in the PVC definition, I suggest using an podAntiAffinity rule in the statefulset definition to deploy your application so that no two instances are located on the same host. 6. StatefulSets manage the deployment and scaling of a set of Pods, and provides guarantees about the ordering and uniqueness of those Pods. To view Resources found in a directory containing a kustomization file, run the following command: kubectl kustomize. This naming is consistent, so you. Kubernetes Deployment vs. Or just strip the name out to get the index at the end. In K8s, StatefulSets are a higher-level abstraction over pods that provide guarantees about the ordering and uniqueness of pods. . Thanks for your reply @cperez08. I have tested its working by autoscaling one of my Deployment. 5 In the latest release, Kubernetes 1. As with StatefulSet creation, the StatefulSet controller created each Pod sequentially with respect to its ordinal index, and it waited for each Pod's predecessor to be Running and Ready before launching the subsequent Pod. Un StatefulSet es el objeto de la API workload que se usa para gestionar aplicaciones con estado. nodeAffinity field (if specified) is taken into consideration by the DaemonSet controller when evaluating the eligible nodes, but is replaced on the created Pod with the node. A single deployment configuration is usually analogous to a single micro-service. The ‘kubectl rollout’ command is used to manage the rollout process for three Kubernetes objects: Deployment, DaemonSet, and StatefulSet. This is applicable for applications that use databases and has a connection with the FE and BE. how=very --from-literal=special. It is resilient against node failures and ensures appropriate data archiving. Pods created by a StatefulSet have predictable names (and hostnames), unlike those created by a ReplicaSet . Statefulset vs Deployment; StatefulSet and Deployment are both Kubernetes resources used for managing containerized applications, but they differ in their intended use cases and features. Deployments are a great choice for applications that don’t require any state to be maintained. Yes, Statefulset is the way to go if the pods need to have their identity defined in some way. The reference to the resource this ScaledObject is configured for. Create a MySQL Deployment. StatefulSet pods have a unique identity that is comprised of an ordinal, a stable network identity, and stable storage. Unlike a Deployment, a StatefulSet. The actual Pod creation is handled by the StatefulSet controller in Kubernetes. Deployment. StatefulSetは状態を保持する (ステートフルな)アプリケーションを管理するためのKubernetesオブジェクトだ。. unavailableReplicasThis page shows you how to configure a Pod to use a PersistentVolumeClaim for storage. Note: This is not a production configuration. Name: nginx-deployment Namespace: default CreationTimestamp: Sun, 02 Sep 2018 18:17:55 -0500 Labels: app=nginx Annotations:. Can support many different deployment patterns, including full restart, customizable rolling updates, and fully custom behaviors, as well as pre- and post- deployment hooks. Các Pod của Statefuleset không hoàn toàn giống. This creates GKE instances and joins them into a single Kubernetes cluster named cockroachdb. StatefulSets let you run stateful applications in Kubernetes. (PV) controllers and architectures like DaemonSet and StatefulSet which remain in operation even when Kubernetes scales and provisions cluster resources and ensures. Kubernetes has become the de-facto orchestration tool and initially it was supporting stateless applications, but stateful (data-driven) applications are very common and are critical to. StatefulSet と PVC の関係まとめ. Meaning you can create a Replica set containing only one Pod specifying to run only one instance of that Pod. spec. spec. StatefulSet is the workload API object used to manage stateful applications. k8s securityContext bypass. The storage for a given Pod must either be provisioned by a PersistentVolume Provisioner based on the requested storage class, or pre-provisioned by an admin. 2 Answers. The StatefulSet ensures ordered creation, scaling, and termination of pods. They each have their own sticky identity, which they keep between. The StatefulSet manifest should feel familiar—it looks a lot like a Deployment manifest! Instead of the volume field under a Deployment’s template spec, we define a VolumeClaimTemplate under the overall StatefulSet spec to describe how the workload will consume storage. if the node becomes unreachable (e. It manages the deployment and scaling of a set of Pods, and provides guarantee about the ordering and uniqueness of these Pods. 3. For a StatefulSet with N replicas, each Pod in the StatefulSet will be assigned an integer ordinal, from 0 up through N-1, that is unique over the Set. Kubernetes is a powerful container orchestration tool that provides a variety of resources. When you’re deploying an application in Kubernetes, you have a few options to choose from. As mentioned above most of the time you can simply use volumes without the need to define StorageClass or PV/PVC. updateStrategy is left unspecified. Statefulsets is used for Stateful applications, each replica of the pod will have its own state, and will be using its own Volume. Just like StatefulSets, Kubernetes Deployments let you define the state of the application, and the Deployment’s controller is responsible for maintaining this state. It manages the deployment and scaling of a set of pods, and provides a guarantee of ordering and uniqueness of the pods. To learn more about replica sets, see the Replication Introduction in the MongoDB manual. This page shows how to run a replicated stateful application using a StatefulSet. statefulset. You can't change some fields in a statefulset after creation. The Airflow Operator creates and manages the necessary Kubernetes resources for an Airflow deployment and supports the creation of Airflow schedulers with different Executors. I have been trying to debug a very odd delay in my K8S deployments. Recreation Strategy: Causes downtime but updates quickly. It specifies that there should be three replicas of the Deployment and that each pod should be labeled with app: nginx. This controller runs Jobs -- components of a Kubernetes workload that execute specific tasks -- according to. kubectl rollout restart sts <name> to restart the pods, one at a time. From K8S Docs. Parallel. Before you begin Before you begin this tutorial, you should familiarize yourself with the following Kubernetes concepts: Pods Cluster DNS Headless Services. If you want to provide workload persistence using Kubernetes persistent storage, you can incorporate a StatefulSet into your. They let you ensure that pods are scheduled in a specific order, that they have persistent storage volumes available, and that they have a persistent network ID that is maintained even when a pod shuts down or is rescheduled. To successfully deploy a MySQL instance on Kubernetes, create a series of YAML files that you will use to define the following Kubernetes objects:. apiVersion: apps/v1 kind: StatefulSet # < kind of installation (statefulset vs Deployment) metadata: name: nextcloud-db # < name of the deployment namespace: nextcloud # < namespace where to place the statefulset and pods labels: app: nextcloud # < label for tagging and reference spec: serviceName: nextcloud-db-service # < name of. Let’s now create the Deployment using the kubectl apply command: $ kubectl apply -f deployment. It provides declarative updates for pods and their associated. Nota: Los StatefulSets son estables (GA) en la versión 1. From there, the StatefulSet Controller handles the. ReplicaSet vs. This ensures it’ll be postgres-2 that’s destroyed first. kubectl apply -f <name> to recreate the StatefulSet. 和 Deployment 类似， StatefulSet 管理基于相同容器规约的一组 Pod。 但和 Deployment 不同的是， StatefulSet 为它们的每个 Pod 维护了一个有粘性的 ID。Deployment vs StatefulSet. This page shows you how to run a single-instance stateful application in Kubernetes using a PersistentVolume and a Deployment. v1. We explore these features using Apache ZooKeeper and Apache Kafka StatefulSets and a Prometheus node exporter. e. affinity. Deployment manages creating Pods by means of ReplicaSets. Issue is only with statefulset. I agree with you. StatefulSet(stable-GA in k8s v1. Each cluster contains one or more nodes. Note: These instructions are for Kubernetes v1. If you are deploying something completely custom and build the docker image. For example, if you have 3 nodes, it will schedule 3. network issue), for Deployment, a new Pod will be created on a different node (to follow your desired 1 replica), but for StatefulSet it will make sure to terminate the existing Pod before creating a new, so that there are never more than 1 (when you have 1 as desired number of replicas). 16. If we need to update the application to a new version, we can change the fields in the Deployment YAML file. kuard-0 kuard-1 kuard-2. StatefulSet lets you run one or moreDeployment — เหมาะสำหรับงานที่แต่ละ Pod ทำงานเป็นอิสระจากกัน (Stateless) StatefulSet — เหมาะกับงานที่แต่ละ Pod มีลำดับ (1 2 3) หรือบทบาทต่างกันGoogle Cloud created it to deploy the containerized infrastructure more efficiently, and it is now a part of the Cloud Native Computing Foundation (CNCF). StatefulSets also enforce that Pods are removed in reverse order of their creation. Note: The command field corresponds to entrypoint in some container runtimes. The differences in this manifest are: Using kind: Deployment to state the resource type. name of the ReplicaSet is part of the basis for naming those Pods. spec. type is set to RollingUpdate, the StatefulSet controller will delete and recreate each Pod in the StatefulSet. This document describes the concept of a StorageClass in Kubernetes. completionMode:. It is easy to set up and helps minimize your management burden. Statefulset es un recurso que controla y gestiona en kubernetes uno o más Pods, pero entonces por qué no usar un Deployment te estarás preguntando?, entonces antes de continuar es mejor que veas las diferencias entre Stateful y Stateless en una. Network identities: Kubernetes StatefulSet provides stable network identities for each pod, while Deployment doesn’t. It is a Kubernetes resource, to manage stateful applications. Deployment is a specialized term in the context of Kubernetes. yml2 Answers. k8s. 28. Scaling Down. StatefulSets assign a sticky identity—an ordinal number starting from zero—to each Pod instead of assigning random IDs for each replica Pod. Create a MySQL Deployment.