(K8S default), set the image of the container to a new version for a particular deployment. Deploy Elasticsearch. zk-0 zk-1 zk-2See StatefulSet vs. A StatefulSet manages Pods that are based on an identical container spec. Definitely leverage a persistent volume for database. We are on Kubernetes 1. Before you begin You need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your. The StatefulSet controller scaled the number of replicas. So, for example, Kubernetes will only create example-statefulset-5 after example-statefulset-4 is up and running. StatefulSet. $ export MYSQLPOD. This task shows how to scale a StatefulSet. Pods deployed by Deployment are identical and interchangeable, created in random order with random hashes in their Pod names. Each individual deployment is represented as a replication controller. A ReplicaSet ensures that a specified number of pod replicas are running at any given time. First, do a git pull to ensure you’re working on the latest revision: $ git pull origin setup-semaphore. kubectl api-resources -o wide | grep -i deployment will provide the relevant information. Each pod has a unique network identity, and a Persistent Volume Claim template named "data" is defined, providing persistent storage to each pod. In statefulsets each replica pod. This naming is consistent, so you. As Crou wrote, it is possible to do this operation with kubectl scale statefulsets <stateful-set-name> but this is an imperative operation and it is not recommended to do imperative operations in a production environment. A simple case is to create one ReplicationController object to reliably run one instance of a Pod indefinitely. 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. yaml. Kubernetes Documentation. Each StatefulSet domain will work as a DNS subdomain depending on the configuration of DNS for a Cluster. So, for example, Kubernetes will only create example-statefulset-5 after example-statefulset-4 is up and running. As the name suggest the statefulsets are specifically used to make sure the app state is saved by each running pod. Authors: Mahamed Ali (Rackspace Technology) The Kubernetes project runs a community-owned image registry called registry. Manages the deployment and scaling of a set of Pods , and provides guarantees about the ordering and uniqueness of these Pods. This is where PersistentVolumes come into play. In this cheatsheet, we will take a look at. A more complex use case is to run several identical replicas of a replicated service, such as web servers. In this. Kubernetes Deployment is a resource that manages a set of identical pods. This is required by RabbitMQ for clustering, and as mentioned in the Kubernetes documentation, has to be created before the Stateful Set. Creating a StatefulSet. In a stateful containerized application, data must be persistent, retained and easy to access outside the application. Like a Deployment, a StatefulSet manages Pods that are based on an identical container spec. Expose MySQL to other pods in the cluster at a known DNS name. Unlike a Deployment, a StatefulSet maintains a sticky identity for each of their Pods. g. In this article. It makes sense also as each Redis instance relies on a configuration file that keeps track of other cluster instances and their roles. What happens when we upgrade a Statefulset to a. Kubernetes StatefulSet vs. Check. yaml kubectl apply -f mongo-statefulset. metadata: name:. 25. MySQL settings remain on insecure defaults to. Statefulsets is used for Stateful applications, each replica of the pod will have its own state, and will be using its own Volume. Statefulset vs Deployment in k8s. Each Pod in a StatefulSet derives its hostname from the name of the StatefulSet and the ordinal of the Pod. 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. Both Pod and Deployment are full-fledged objects in the Kubernetes API. The stable hostname is generated from the name of the StatefulSet and the ordinal number of the pod in the set. Each Pod in a StatefulSet derives its hostname from the name of the StatefulSet and the ordinal of the Pod. It provides declarative updates for pods and their associated. As Trident uses dynamic provisioning, we will specify a StorageClass, which must have been setup. They give Pods a stable identity and consistent ordering during scaling operations. What it boils down to is that Deployment will create Pods with spec taken from the template. Apr 6, 2020 at 8:53. The above command will create a ReplicaSet with three replicas and manage the lifecycle of the pods. DaemonSets. In the above YAML file, we have defined a simple StatefulSet to deploy a PostgreSQL database. 1. 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. However,. They each have their own sticky identity, which they keep between. Deployment vs. Introduction to autoscaling in k8s. Dynamic volume provisioning allows storage volumes to be created on-demand. Nó sẽ được tạo tuần tự. A StatefulSet is another Kubernetes controller that manages pods just like Deployments. While they have similar goals, they handle them in very different ways. StatefulSet vs Deployment. Kindly. If you define args, but do not define a command, the default command is used with your new arguments. Additionally, we are creating a Persistent Volume using the volumeClaimTemplate and using it in the StatefulSet to store the PostgreSQL data. A Kubernetes pod is a cluster deployment unit that typically contains one or more containers. Orleans will run in Kubernetes without specific configuration, however, it can also take advantage of extra knowledge which the hosting platform can provide. This is different from a Deployment where the Pods are expected to be interchangeable. Kubernetes or K8s is an open-source orchestration system for containerized applications that helps in automating software deployment, management and scaling. StatefulSet. The metadata in an annotation can be small or large, structured or unstructured, and can. A pod is the smallest deployable unit in Kubernetes which has a collection of containers. Several other StatefulSet features also apply to this example:StatefulSet vs Deployment. 1. StatefulSet pods have a unique identity that is comprised of an ordinal, a stable network identity, and stable storage. Kubernetes provides a basic resource called Pod. They both make it easy to orchestrate multiple Pod replicas, but they have different features that specialize them for separate use cases. Deployment. yaml) snippet below which shows the usage of the Readiness probe and the Liveness probe. Pod Management. A StatefulSet is a Kubernetes API object for managing stateful application workloads. 8 min read. PersistentVolumes and StatefulSets are the main approaches for running stateful applications in Kubernetes. DaemonSet. 5 or later. StatefulSetの概要. In StatefulSet, instead of the normal service, we need to create a headless service. StatefulSet. It uses a template to describe what each Pod must contain. The actual Pod creation is handled by the StatefulSet controller in Kubernetes. 14, Kubectl also supports the management of Kubernetes objects using a kustomization file. spec. For example, if you create a StatefulSet named “my-statefulset” with three replicas, the pod names would be “my-statefulset-0”, “my-statefulset-1”, and “my-statefulset-2”. Each object in your cluster has a Name that is unique for that type of resource. This comes at a cost of slow scale ups and scale downs for. apps/mongo created Click Check my progress to verify the objective. This creates GKE instances and joins them into a single Kubernetes cluster named cockroachdb. If your application is stateless, you should use Deployment and not StatefulSet. From there, the StatefulSet Controller handles the. 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, you define how many replicas ( pods) of your app you want to run in the deployment. In order to save confidential data one can use a K8s resource called Secret. In other words, each Pod completion is. The user can specify a different scheduler for the Pods of the DaemonSet, by setting the . But for an eviction, the PodDisruptionBudget's maxUnavailable will prevail, even if the Deployment specifies a. The hostnames take the form of <statefulset name>-<ordinal index>. The new pods are scheduled on eligible nodes (they may not run on the same nodes as the original pods). Each time a deployment is triggered, whether manually or automatically, a deployer pod manages the deployment (including scaling down the old replication controller, scaling up the new one, and running hooks). Pic from k8s. When you use a StatefulSet, Kubernetes terminates Pods in the opposite order to their creation. e. The solution(s) : Use a StatefulSet, ReplicaSet or DaemonSet to ensure the Pod creation after a Node failure. Deploying workloads as StatefulSet helps provide features like unique. In Prefect Cloud, go to Blocks, hit the + button, and select the Kubernetes Job block. Create ConfigMaps from literal values. 0 and wonder if there is way to access an "ordinal index" of a pod with in its statefulset configuration file. Check if the Cassandra nodes are up,. Horizontal scaling means that the response to increased load is to deploy more Pods. Since 1. 23 introduced a new, alpha-level policy for StatefulSets that controls the lifetime of PersistentVolumeClaims (PVCs) generated from the StatefulSet spec template for cases when they should be deleted automatically when the StatefulSet is deleted or pods in the StatefulSet are scaled. 只能用StatefulSet: 最近在微软的aks平台上部署服务，由于Deployment在scale的时候需要动态申请volume，采取使用volumeClaimTemplates属性的方式来申请，当前Deployment对象（1. Of course, the scaling depends on the app you are deploying. It will create three Pods named web-0,web-1,web-2. Note the client provided takes precedence over the configured transport values. This behavior doesn't apply when the entire StatefulSet is deleted and can be disabled by setting a StatefulSet's . StatefulSets handle the deployment and scaling of sets of Kubernetes pods, providing guarantees about their uniqueness and ordering. 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. 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%)]`. I'm using Logstash on Kubernetes and use the official Helm chart at this link. In short, a pod is the core building block for running applications in a Kubernetes cluster; a deployment is a management tool used to control the way pods behave. You should change eight files in total: “Deploy to Blue/Green”, “Activate Blue/Green”, and the decommission and the rollback pipelines. If you don’t specify the namespace, it gets deployed in the default namespace. At this point we have a running MySQL server, let's use this guide to simulate failover of a node. Could someone explain in simple details how patch works. kubectl create namespace database. 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. Get Full-Length High-Quality DevOps Tutorials for Free - Subscribe Now. Here is the deployment diagram: Notice that the mariadb pod uses StatefulSet and a persistent volume for its data. yaml. This logic is mandatory in. Both Deployment and StatefulSet try to maximize the availability - but StatefulSet cannot sacrifice data consistency (e. Dynamic volume provisioning allows storage volumes to be created on-demand. Kubernetes proporciona un recurso base llamado Pod (cápsula). When to use a ReplicaSet. First sentence in the documentation: "The Horizontal Pod Autoscaler automatically scales the number of Pods in a replication controller, deployment, replica set or stateful set". 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. Unlike a Deployment, a StatefulSet maintains a. io/ssd created Deploy etcd cluster. 2. When you’re deploying an application in Kubernetes, you have a few options to choose from. If you don’t specify the namespace, it gets deployed in the default namespace. kubectl patch statefulset my-set -p '{"spec":{"The last step is to "assign" volume to your execution (Pod, Deployment, StatefulSet, etc) which is done using volumes. 9) is a Kubernetes resource used to manage stateful applications. It is rather unlikely that you will ever need to create Pods directly for a production use-case. We like to dynamically assign a value (that's derived from the ordinal index) to the pod's label and later. 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. In this example: A Deployment named nginx-deployment is created, indicated by the . yml. If you require stable, data restoring operation to your application, you can use a StatefulSet in Kubernetes. Object Names and IDs. field to . NAME READY STATUS RESTARTS AGE patch-demo-28633765-670qr 1/1 Running 0 23s patch-demo-28633765-j5qs3 1/1 Running 0 23sLet’s deploy our first three replica Cassandra cluster on our existing AWS K8s cluster with OpenEBS. yaml. NFS subdir external provisioner is an automatic provisioner that uses your existing and already configured NFS server to support dynamic provisioning of Kubernetes Persistent Volumes via Persistent Volume Claims. To create a StatefulSet resource, use the kubectl apply command. If the StatefulSet is scaled down to one replica, mysql-3 is guaranteed to exit first, followed by mysql-2. Deployment. 9) is a Kubernetes resource used to manage stateful applications. Deploymentと異なり、StatefulSetはPodを直接管理しています。 OrderedReadyはReadinessProbeを監視しつつ、一つずつPodを増減します。 ParallelはDeploymentのスケールと同様、Podを並列的に増減させます。 Podの更新. Compare Kubernetes StatefulSet vs. In order to demonstrate the basic features of a. Note: The command field corresponds to entrypoint in some container runtimes. In most cases, users ignore how their pods are scheduled. The StatefulSet ensures ordered creation, scaling, and termination of pods. 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. This article will walk you through how to deploy NFS Subdir External Provisioner to the k8s cluster and create the PV using the. Pods are deployed in {0. Pods are created and terminated in a predictable order, ensuring orderly scaling and rolling updates. Compare Kubernetes StatefulSet vs. A StatefulSet "provides guarantees about the ordering and uniqueness of these Pods". – In the previous blog we created a stateless application, deployed with K8s resource Deployment, which allows one to replicate the application, but where data is lost when Pods are restarted, meaning there were no data consistency. The common format of a kubectl command is: kubectl action resource This performs the specified action (like create, describe or delete) on the specified resource (like node or deployment). Before you begin This is a fairly advanced task and has the potential to violate some of the properties inherent to StatefulSet. Related Resources. 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. Check. g. To deploy the PostgreSQL cluster, we will create a dedicated namespace named database. We explore these features using Apache ZooKeeper and Apache Kafka StatefulSets and a Prometheus node exporter. You can see the metrics in line charts over a period of time under the Monitoring tab. kuard-0 kuard-1 kuard-2. Parallel. This topic was automatically closed 28 days after the. How to Set Up a Kubernetes MySQL Deployment with Cloud Volumes ONTAP. StatefulSet と PVC の関係まとめ. $ kubectl apply -f statefulset. A Kubernetes StorageClass is a Kubernetes storage mechanism that lets you dynamically provision persistent volumes (PV) in a Kubernetes cluster. kubectl delete sts --cascade=orphan <name> to delete the StatefulSet and leave its pods. v1. The Reclaim Policy is used to determine the actions that need to be taken by the storage backend on deletion of the PV. The deployment process for Deployment objects is driven by a controller loop, in contrast to DeploymentConfig objects which use deployer pods for every new rollout. StatefulSet で作成された Pod は、それぞれ単一の PV をマウントしています. WEKA. Unlike a Deployment, a StatefulSet. This ensures it’ll be postgres-2 that’s destroyed first. Latest Deployment Generation: kube_deployment_metadata_generation: Sequence number representing the latest generation of a Deployment. This behavior doesn't apply when the entire StatefulSet is deleted and can be disabled by setting a StatefulSet's . StatefulSets are designed to run stateful applications in Kubernetes with dedicated persistent storage. How could I patch "imagePullPolicy" for instance. Running K8s on a single node is not a good idea if you want to build in fault. E. It offers a framework to manage clusters of hosts running Linux containers,. g. February 4, 2021. The Microsoft. Get the Pods to see the ordered creation status: kubectl get pods -l="app=cassandra". Kubernetes (K8s) es un orquestador de contenedores de código abierto orientado a automatizar la implementación, escalado y administración de aplicaciones en contenedores Docker o CRI-O. A ReplicaSet is used to ensure that a specific number of replicas (copies) of a pod are running at any given time, while a Deployment manages updates to a ReplicaSet by creating a new ReplicaSet with the updated pod template and gradually scaling it up while scaling down the old ReplicaSet. template. Unlike a Deployment, a StatefulSet. But each resource type. ValidationError(StatefulSet. Full k8s cluster consists of 4–5 services on the control plane and two on worker nodes. . It manages the. Monitoring is similar, though — you need to make sure that the number of desired StatefulSet Replicas matches the number of ready StatefulSet Replicas. If you want to provide workload persistence using Kubernetes persistent storage, you can incorporate a StatefulSet into your. StatefulSetには以下のような特徴がある。. It will create three replicas in random order with a random hash. Here is the quote from a relevant section from the docs: Like a Deployment, a StatefulSet manages Pods that are based on an identical container spec. We explore these features using Apache ZooKeeper and Apache Kafka StatefulSets and a Prometheus node exporter. Currently the StatefulSets support only two kinds of update strategies:. StatefulSet est l'objet de l'API de charge de travail utilisé pour gérer des applications avec état (stateful). Statefulset is generally used with a distributed applications that require each node to have a persistent state and the ability to configure an arbitrary. All of the other parts are ready and we will just plug in the engine and we will be ready to hit the road. A pod is the smallest deployable unit in Kubernetes which has a collection of containers. spec. conditions[1): unknown field "lastUpdateTime" in io. StatefulSet workloads. 2. Deploying a MongoDB Database: Here is an example of how to deploy a MongoDB database using a StatefulSet in Kubernetes. It makes sense also as each Redis instance relies on a configuration file that keeps track of other cluster instances and their roles. 安定したネットワーク識別子. The first method will store users in one file and passwords in another file, and create the Secret object by reading from files. Familiarity with volumes and persistent volumes is suggested. I have updated my question with more details. Two commonly used ones are Deployments and StatefulSets. apps. To successfully deploy a MySQL instance on Kubernetes, create a series of YAML files that you will use to define the following Kubernetes objects:. I tested this on kubernetes 1. Use kubectl to scale StatefulSets; kubectl scale sts nacos --replicas=3kubernetes, docker, k8s, cluster, kubectl, Workloads, DaemonSet, CronJob, StatefulSet, Job. serviceName property. As a result, when the deployment starts to scale, unready applications might receive traffic. Orleans. Thanks for your reply @cperez08. quan hệ giữa Job và CronJob cũng giống như Deployment và ReplicaSet. If you want to delete just the StatefulSet and not the pods, use --cascade=false. The StatefulSet name is derived from the Elasticsearch resource name and the NodeSet name. StatefulSet is the workload API object used to manage stateful applications. Issue is only with statefulset. Elasticsearch nodes have the same name as the Pod they are running on. yml Statefulset . Rather, a deployment is a file that defines a pod's desired behavior or characteristics. Create a new file and fill it with the following StatefulSet configuration then we explain what it does. Các Pod của Statefuleset không hoàn toàn giống. It is resilient against node failures and ensures appropriate data archiving. The StatefulSet controller is responsible for creating, scaling and deleting members of the StatefulSet. Run a Stateless Application Using a Deployment; Run a Single-Instance Stateful Application; Run a Replicated Stateful Application; Scale a StatefulSet; Delete a. The example above will create three Pods named web-0,web-1,web-2. spec. ** Notes. metadata. Note: This is not a production configuration. The new pod will automatically spin up with correct configuration. To execute our deployment, we need a service to access the above deployment. First, we run the service template : kubectl apply -f service. By Chris Tozzi Published: 16 Nov 2022 StatefulSets. Kubernetes will automatically pick Docker as the default container runtime. A StatefulSet lets you manage one or more Pods – all running the same application code – where the Pods rely on having a distinct identity. A Kubernetes StorageClass is a Kubernetes storage mechanism that lets you dynamically provision persistent volumes (PV) in a Kubernetes cluster. 只能用StatefulSet: 最近在微软的aks平台上部署服务，由于Deployment在scale的时候需要动态申请volume，采取使用volumeClaimTemplates属性的方式来申请，当前Deployment对象（1. This way you could either, name the stateful-set according to the classes, i. DaemonSets. 1 Answer. We are creating a StatefulSet called postgresql-db with two pods (replicas: 2). As a pod can have. En esta entrada vamos a tratar sobre aplicaciones Stateful en Kubernetes – Statefulset, el cual es un tipo de recurso que nos ofrece Kubernetes. A StatefulSet is a controller that helps you deploy and scale groups of Kubernetes pods. io. Pods. You, now taking the role of a developer / cluster user, create a. podManagementPolicy. The dynamic provisioning. These priorities does not only happens when a Node becomes unreachable, but at all times, e. status. This naming is consistent, so you. 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. 9. As the name suggest the statefulsets are specifically used to make sure the app state is saved by each running pod. Deploy and Manages the stateless application. Using ConfigMap in StatefulSet. Also, you will not have to create a PVCs in advance, and you will be able to scale it easily. Editor's note: today's post is by Janet Kuo and Kenneth Owens, Software Engineers at Google. requires writes. 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 restarts. It allows you to define the Kubernetes Deployment or StatefulSet that you want KEDA to scale based on a scale trigger. template. Jobs with fixed completion count - that is, jobs that have non null . Deployment manages creating Pods by means of ReplicaSets. StatefulSets. When you use a StatefulSet, Kubernetes terminates Pods in the opposite order to their creation. Different classes might map to quality-of-service levels, or to backup policies, or to arbitrary. Tweet. However, the administration of stateful applications and distributed systems on Kubernetes is a broad, complex topic. StatefulSets also enforce that Pods are removed in reverse order of their creation. StatefulSet(stable-GA in k8s v1. See full list on baeldung. env. But unlike a regular deployment, it allows you to specify the order and dependencies of the deployment to. The first line of this snippet copies the original StatefulSet and creates a statefulSetCanary, which has some additional adjustments, like the `-canary` suffix, the `track: canary` label, and. You can use either labels or annotations to attach metadata to Kubernetes objects. If your application needs to be brought up in a specific order, use statefulset. You can also create Pods (containers. The number of required nodes of our cluster. Kubernetes is a popular choice for hosting Orleans applications. Deployment. StatefulSet là resource cũng có thể nói là bản sao đặc biệt của ReplicaSet. You can pass in multiple key-value pairs. Unlike deployments, statefulset maintains an identity for each of the pods. readyReplicas integer: readyReplicas is the number of pods targeted by this Deployment with a Ready Condition. Editor’s note: this post is part of a series of in-depth articles on what's new in Kubernetes 1. It tries to ensure that the specified number of Pods from ordinal 0 through N-1 are alive and ready. For example, if you have 3 nodes, it will schedule 3. StatefulSet también es un controlador, pero a diferencia del deployment, no crea ReplicaSet sino que crea el Pod directamente con una nomenclatura única. Elasticsearch nodes have the same name as the Pod they are running on. StatefulSet (stable-GA in k8s v1. The . So yes, StatefulSet helps preserve the order and name of the pod, but what is it that it does extra (or different) that is advantageous over a regular Deployment with respect to volumes. Conclusion. pod名字始终是固定的 4. Manages the deployment and scaling of a set of Pods, and provides. This page shows you how to run a single-instance stateful application in Kubernetes using a PersistentVolume and a Deployment. Click a single StatefulSet to go to its detail page. $ kubectl delete sts/kafka statefulset. Node affinity is a set of rules used by the scheduler to determine where a pod can be placed. 5, we’ve moved the feature formerly known as PetSet into beta as StatefulSet. So you will have a statefulset definition similar to this: apiVersion: apps/v1 kind: StatefulSet metadata: name: myset spec: replicas: 3. StatefulSetの概要. It ensures that the desired number of replicas (PODs with the application running), as mentioned while creating the Replicaset, is always maintained. For example, if you wanted 3 database instances you could manually create 3 deployments and 3 services. Contrairement à un Deployment, un. Yes, my metrics server is running fine. I agree with you. Pod に障害が発生し、オートヒーリングを実施した際にも、同一のPVを引き続き mount. This page shows how to configure liveness, readiness and startup probes for containers. api. The common format of a kubectl command is: kubectl action resource This performs the specified action (like create, describe or delete) on the specified resource (like node or deployment). yml Statefulset . CronJob. StatefulSet est l'objet de l'API de charge de travail utilisé pour gérer des applications avec état (stateful). On deployment level it is not possible, but there is an option to do this indirectly. Familiarity with volumes and persistent volumes is suggested. Unlike a Deployment, a StatefulSet maintains a sticky identity for each of their Pods. Each cluster contains one or more nodes. Following the same logic, if something happens to any of the pods, it will be recreated with the same name. Node affinity allows a pod to specify an affinity (or anti-affinity) towards a group of nodes it can be placed on. –In the previous blog we created a stateless application, deployed with K8s resource Deployment, which allows one to replicate the application, but where data is lost when Pods are restarted, meaning there were no data consistency. spec. This task shows you how to delete a StatefulSet. Storage classes can define properties of storage systems. Updates are versioned and you can revert to any previously known state of a Deployment. Comme un Déploiement, un StatefulSet gère des Pods qui sont basés sur une même spécification de conteneur. kubectl apply -f <name> to recreate the StatefulSet.