updateStrategy field, by waiting for each pod for a. Also, you will not have to create a PVCs in advance, and you will be able to scale it easily. But unlike a regular deployment, it allows you to specify the order and dependencies of the deployment to. イメージ的にはPodTemplateを持つDeploymentにPVCも追加した感じ。. 0. Các Pod của Statefulset không thể được tạo hay xóa cùng lúc. In a Kubernetes cluster, each Pod gets its own internal IP address, but the Pods in K8s are ephemeral, meaning that they are destroyed frequently. Each Pod has init and main container. PersistentVolumes and StatefulSets are the main approaches for running stateful applications in Kubernetes. yaml. StatefulSet. system (system) Closed March 11, 2022, 6:44am 3. Ordinal Index. Making an app stateless make it much easier to run as a distributed system e. A key feature with StatefulSet is that they provide unique stable network identities for the instances. But unlike a regular deployment, it allows you to specify the order and dependencies of the deployment to. StatefulSets are particularly useful when you have stateful applications, such as databases, that require stable network identities and persistent storage. statefulsets do ordinal scheduling; first pod 0, then pod 1, etc. Các Pod của Deployment cũng có thể bị xóa theo thứ tự bất kỳ, hoặc xóa đồng thời nhiều Pod (trong trường hợp scale down deployment) Statefulset. This is important because many stateful applications have data initialization routines to perform, masters to elect, and quorum to achieve. Persistent storage: Kubernetes StatefulSet can manage the creation and deletion of PVCs while Deployment can’t. Additionally, StatefulSet maintains a sticky. It offers a framework to manage clusters of hosts running Linux containers,. k8s. Run a Stateless Application Using a Deployment; Run a Single-Instance Stateful Application; Run a Replicated Stateful Application; Scale a StatefulSet; Delete a. StatefulSets. Nota: Los StatefulSets son estables (GA) en la versión 1. Using ConfigMap in StatefulSet. availableReplicas . g. See StatefulSet vs. For example, to create and check a service configuration for an Nginx application, use the following: kubectl expose deployment/nginx-app1. In Kubernetes, a HorizontalPodAutoscaler automatically updates a workload resource (such as a Deployment or StatefulSet), with the aim of automatically scaling the workload to match demand. 1 Answer. When a pod instance managed by a StatefulSet disappears (because the node the pod was running on has failed, it was evicted from the node, or someone deleted the pod object manually), the StatefulSet makes sure it’s. StatefulSet is the workload API object used to manage stateful applications. Deployments allow you to manage sets of identical pods (or ReplicaSets) using common configurations. Four Pods are running. g. Statefulset is generally used with a distributed applications that require each node to have a persistent state and the ability to configure an arbitrary number of nodes. StatefulSets in action with Istio 1. StatefulSet is the workload API object used to manage stateful applications. Introduction to autoscaling in k8s. Kubernetes provides a basic resource called Pod. You can use statefulsets if you want fixed pod names for your application. 23 version is introducing some new and updated functionality, such as Pod Security Admission, Dual-stack IPv4/IPv6 Networking, Kubelet Container Runtime Interface, the general availability of Generic Inline Volume, and much more. StatefulSetCondition] You should delete everything from the status field. Take Assessment. In this article, we’ll take a look at the differences between Deployment and StatefulSet and when you should use one over the other. StatefulSets are used when state has to be persisted. Kind of like a watch dog. Community. StatefulSet(stable-GA in k8s v1. Product. Introduction A StorageClass provides a way for administrators to describe the "classes" of storage they offer. In this guide, we explain to readers the differences between using a Kubernetes statefulset, versus using a deployment, as well as the use cases for each. Al igual que un Deployment, un StatefulSet gestiona Pods que se basan en una especificación idéntica de contenedor. Also, you will not have to create a PVCs in advance, and you will be able to scale it easily. k8s. A pod is the smallest deployable unit in Kubernetes which has a collection of containers. In this post, we offer two quick tutorials that will show how to mount NFS. This is different from vertical scaling, which for Kubernetes would. Kubernetes headless service is a Kubernetes service that does not assign an IP address to itself. This enables Kubernetes clusters. There are two. Check. Minikube is a tool used to run a single-node Kubernetes cluster locally. In your case each deployment is having same PersistentVolumeClaim (that is ReadWriteOnly and can't be mounted on second request), while with volumeClaimTemplates you get different one provisioned per. A statefulset would create a volume for every replica, which is what you definitely want for a database. apps. StatefulSet. pod名字始终是固定的 4. WordPress is a stateful application the relies on two persistence backends: A file system and MySQL database. Choosing the right workload deployment type doesn't affect performance, but the StatefulSet does provide identity stickiness requirements. 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. Represents the latest available observations of a statefulset’s current state. Understanding ReplicaSetsTo execute our deployment, we need a service to access the above deployment. Although this is not directly answer your question, maybe it provides some hint for your consideration. 2 Answers. Each pod has a persistent identifier, that it maintains across any. Manages the deployment and scaling of a set of Pods , and provides guarantees about the ordering and uniqueness of these. Conclusion. apps. 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”. So we will add the namespace while deploying each component. api. Then we run the command for the deployment template : kubectl apply -f demo-deployment. In order not to alter or use the default one I want to create service account and mount certificate into the pods of a deployment. 2. 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. Kubernetes or K8s is an open-source orchestration system for containerized applications that helps in automating software deployment, management and scaling. The behavior I want, when doing a rolling update, is for the previous. When the pod fails and stops logging, the kubectl logs -f mypod will terminate and then the shell will immediately execute kubectl describe pod mypod, (hopefully) letting you catch the state of the failing pod before it is recreated. Deploymentなど、StatefulSet以外のリソースを使う必要がある。Author: Matthew Cary (Google) Kubernetes v1. Trident automatically caters to persistent volume claims in Kubernetes by leveraging Azure disk storage, AWS EBS block storage, GCP Persistent Disks via Cloud Volumes ONTAP or on-premises ONTAP appliances. A StatefulSet is another Kubernetes controller that manages pods just like Deployments. One pod should be able to reach other pods with well-defined names. I am curious to know how to do deployment when we have a service dependency!. statefulsets do ordinal scheduling; first pod 0, then pod 1, etc. 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. It manages the deployment and scaling of a set of Pods, and provides guarantee about. using ClusterIP services). Deploying Nextcloud to k8s from 1,000 feet. StatefulSets vs. 2. kubectl basics. Then we run the command for the deployment template : kubectl apply -f demo-deployment. There is around 250+ pods are running and HPA has been implemented on it too that can scale upto 400 pods. The image that I am using for the deployment is “mongo” Statefulset so that we get a unique pod. A Hypervisor (like VirtualBox or HyperKit) to manage virtual machines;. It will trigger them all at once. They keep unique identities for each Pod they manage and use the same identity when Pods need to be rescheduled. 2. These priorities does not only happens when a Node becomes unreachable, but at all times, e. Kubernetes StatefulSet is the workload API object used to manage stateful applications. Let’s now create the Deployment using the kubectl apply command: $ kubectl apply -f deployment. Of course, the scaling depends on the app you are deploying. io. We usually need StatefulSet when we have a stateful app, so every pod can have its own volume. Kubernetes provides a basic resource called Pod. StatefulSets are used when state has to be persisted. Kubectl is the command line configuration tool for Kubernetes that communicates with a Kubernetes API server. Only stateless services should be deployed as Deployment. 5 In the latest release, Kubernetes 1. In this tutorial, you will install Waypoint into an existing. 3. If the StatefulSet is scaled down to one replica, mysql-3 is guaranteed to exit first, followed by mysql-2. PersistentVolumes and StatefulSets are the main approaches for running stateful applications in Kubernetes. StatefulSet is the workload API object used to manage stateful applications. It gives the pods sequential names, starting with statefulsetname-0; and. 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's created after deployment. The following brings up the StatefulSet including two pods (a leader and a follower), binds the persistent volumes to each pod as well as creates a headless service for it: $ kubectl create ns mehdb. Next, add the following lines to the deployment pipeline files. They use a K8S component called Service, to group the pods using labels. The output of the describe command in this example is the following: Name: nginx-app1. CPU requests are mostly more important for the kube-scheduler to identify the best node suitable to place a pod. If your application is stateless, you should use Deployment and not StatefulSet. HeadlessService - stable network ID you need to define a headless service for stateful applications. In this article, we will deploy a clustered Prometheus setup that integrates Thanos. yaml storageclass. Horizontal scaling means that the response to increased load is to deploy more Pods. Resource objects typically have 3 components: Resource ObjectMeta: This is metadata about the resource, such as its name, type, api version, annotations, and labels. 25. For simplicity, are we using Nginx as the pod image. What it boils down to is that Deployment will create Pods with spec taken from the template. The Airflow Operator creates and manages the necessary Kubernetes resources for an Airflow deployment and supports the creation of Airflow schedulers with different Executors. If you want to provide workload persistence using Kubernetes persistent storage, you can incorporate a StatefulSet into your. Author: Chris Henzie (Google) Last month's release of Kubernetes v1. 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. Latest Deployment Generation: kube_deployment_metadata_generation: Sequence number representing the latest generation of a Deployment. Using volumeClaimTemplates, each replica will get a unique PersistentVolumeClaim with statefulset whereas all replicas would share the PersistentVolumeClaim with a deployment. The name of an Ingress object must be a valid DNS subdomain name. StatefulSet is the workload API object used to manage stateful applications. Pods deployed by Deployment are identical and interchangeable, created in random order with random hashes in their Pod names. Các Pod của Deployment cũng có thể bị xóa theo thứ tự bất kỳ, hoặc xóa đồng thời nhiều Pod (trong trường hợp scale down deployment) Statefulset. StatefulSet. Pods are the smallest deployable units of computing that you can create and manage in Kubernetes. I'm using Logstash on Kubernetes and use the official Helm chart at this link. Use a text editor to create a YAML file: nano StatefulSet. Where the reclaim policy is Delete, the expectation is that the storage backend releases the storage resource that. For each topology, we count the number of Pods that match this label selector. For general information about working with config files, see deploying applications, configuring containers, managing resources. This is great for stateless apps that we want online, ASAP. In my case it was showing. StatefulSet. kubectl create namespace database. In one terminal, watch the StatefulSet's Pods: A Deployment is a management tool for controlling the behavior of pods. We can now deploy the etcd cluster, which will be a StatefulSet with 3 replicas and two Services, one for internal peer communication between the instances as headless service and another for accessing the cluster externally through the API. When you have an app which requires persistence, you should create a stateful set instead of deployment. This chart deploys Logstash as a statefulset. Simply use a volume in the required Resources and K8S will take care of that for you. Statefulsets, on the other hand, are useful when running workloads that require persistent storage. $ kubectl -n=mehdb apply -f app. This enables Kubernetes clusters to take advantage of. spec: serviceAccountName: build-robot. That's it! With these two commands, you have launched all the components required to run an highly available and redundant MongoDB replica set. 1 Answer. It allows storage providers to deploy plugins through standard k8s primitives like storage classes, PersistentVolumes (PVs) and PersistentVolumeClaims (PVCs). Kubernetes Deployment vs. Deployment vs Statefulset . A service is responsible for enabling network access to a set of pods. Kubernetes Apply. Apr 6, 2020 at 8:53. 1 Like. Priority indicates the importance of a Pod relative to other Pods. labelSelector is used to find matching Pods. This task shows how to scale a StatefulSet. Deployment vs StatefulSet component. Similar to the Deployment, the StatefulSet manages pods that are based on an identical container specification. Kubernetes proporciona un recurso base llamado Pod (cápsula). Read more: Kubernetes StatefulSet: A Practical Guide. Waypoint helps simplify the deployment process with its Helm plugin and does so automatically with its Git integration and GitOps. 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. a cache or database cluster even though it may solve your specific situation as. In Elasticsearch, deployment is in clusters. StatefulSet is the workload API object used to manage stateful applications. It is an ordered and graceful deployment. A Kubernetes StorageClass is a Kubernetes storage mechanism that lets you dynamically provision persistent volumes (PV) in a Kubernetes cluster. These are applications that need to be run on every node in the cluster. 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. php with a username/password that it. A ReplicaSet (RS) is a Kubernetes object used to maintain a stable set of replicated pods running within a cluster at any given time. Apply and Delete Kubernetes resource files. 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. Ingress frequently uses annotations to configure some options depending on. This tutorial provides an introduction to managing applications with StatefulSets. You might set the Deployment to have replicas: 3 so that if one of them fails the other two can pick up the load. Storage classes can define properties of storage systems. This document highlights and consolidates configuration best practices that are introduced throughout the user guide, Getting Started documentation, and examples. If, in any case, one of the pod die,s the newly generated pod will be of the same ID. This blog describes the two features namely minReadySeconds for StatefulSets and maxSurge for DaemonSets that SIG Apps is happy to graduate to stable in Kubernetes 1. StatefulSet is a Kubernetes API object that helps in the deployment and. 15 PDBs support custom controllers where the scale subresource is enabled. Kubernetes Deployment vs StatefulSet: Which is Right for You?A different kinds of replicas in the Deployment's Status can be described as follows:. This page provides an overview of init containers: specialized containers that run before app containers in a Pod. Pod Management. As with all other Kubernetes API objects, a ReplicaSet needs the apiVersion, kind, and metadata fields. K8s is a notoriously complex system to use and maintain, so getting a good grasp of what you should and should not be doing, and knowing what is possible will get your deployment off to a solid start. A Pod (as in a pod of whales or pea pod) is a group of one or more containers, with shared storage and network resources, and a specification for how to run the containers. It can manage the scaling and deployment of a collection of. The last section of the manifest defines our StatefulSet. Both Deployment and StatefulSet try to maximize the availability - but StatefulSet cannot sacrifice data consistency (e. This is known as Quality of Service (QoS) class. 2. Finally, we will visualize and monitor all our data in. StatefulSet is the workload API object used to manage stateful applications. The StatefulSet name is derived from the Elasticsearch resource name and the NodeSet name. ReplicaSet ReplicaSet 的目的是维护指定数量的 Pod，常用做保障指定数量 Pod 的可用性 Deployment Deployment 是一个用来管理 ReplicaSet 的更高级概念，某种程度上我们不应该操作 ReplicaSet，而是直接使用 Deployment。Deployment 拥有 Rollout & Rollback 功能，方便我们管理。 StatefulSet StatefulSet 用来管理有状态的应用，其会. The StatefulSet controller provides each Pod with a unique hostname based on its ordinal index. Therefore the latter use. If you look at web_stateful. e. Pods. The StatefulSet controller scaled the number of replicas. From this point onwards, the pods or containers that made the claim can make use of the storage volume. yaml file, you will find a snippet around how we are deploying a stateful application. Create a StatefulSet. Deployment is best suited for stateless applications while StatefulSet is best suited for. My Understanding of this doc page is, that I can configure service accounts with Pods and hopefully also deployments, so I can access the k8s API in Kubernetes 1. StatefulSet and deployment controllers. It's a good mix of simple animations (theory) and demo (practice) to get a good understanding. In this Kubernetes StatefulSet tutorial, I explain the difference between Deployment and StatefulSet. Google Cloud created it to deploy the containerized infrastructure more efficiently, and it is now a part of the Cloud Native Computing Foundation (CNCF). io/v1beta1 and CertificateSigningRequest to two keys. StatefulSets. Create namespace, storageclass, Google compute Disk and persistentvolumes. Unlike a. This is important because many stateful applications have data initialization routines to perform, masters to elect, and quorum to achieve. Kubernetes StatefulSet simply explained | Deployment vs StatefulSet. It is responsible for the deploying, scaling of a set of Pods, and guarantees the ordering and uniqueness of these Pods. All the examples available are showing Redis cluster being deployed as a combination of Kubernetes’ StatefulSets and PersistentVolumes. 3. As a Deployment, a StatefulSet manages Pods that are based on an identical container specification, but it maintains an identity attached to each of its pods. As a pod can have. Step-5: Checking the Pod status. api. Hi sure, that's why I noted at the end of the video that k8s supports you in that but, data synch, cloning config and storage management is. This page describes the lifecycle of a Pod. In this video I show the syntax and contents of the configuration file by showing how to create and connect deployment and service component. Your Deployment yaml should be like below: containers: - name: nginx image: nginx volumeMounts: - mountPath: /etc/nginx name: nginx-conf volumes: - name: nginx-conf configMap: name: nginx-conf items: - key:. Kubernetes offers a highly resilient infrastructure designed for zero downtime deployment, with capabilities such as scaling. There are many benefits. Create a StatefulSet file. Authors: Mahamed Ali (Rackspace Technology) The Kubernetes project runs a community-owned image registry called registry. Comme un Déploiement, un StatefulSet gère des Pods qui sont basés sur une même spécification de conteneur. 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. Question. Learning to use Helm can be time-consuming for a team with no prior experience with the tool. 22 introduced a new ReadWriteOncePod access mode for PersistentVolumes and PersistentVolumeClaims. By baking K8s. StorageClass apiVersion: storage. While StatefulSet is used for stateful applications like databases, Deployment component is used to deploy stateless applications. This can be extended to a scenario where different StatefulSet pods with the same role may have different permissioning schemes or data synchronization needs depending on the network topology (e. Background. The Horizontal Pod Autoscaler automatically scales the number of pods in a replication controller, deployment, replica set or stateful set based on observed CPU utilization (or, with custom metrics support, on some other application-provided metrics). If we need to update the application to a new version, we can change the fields in the Deployment YAML file. You should then probably use StatefulSet and volumeClaimTemplates within it instead of Deployment and PersistentVolumeClaim. Unlike a Deployment, a StatefulSet maintains a sticky identity for each of their Pods. Restart Pods. The manifest files do not have the namespace added to them. StatefulSetSpecPic from k8s. Limitations. Quick tutorial #1: Mounting an NFS share on a container. g. Read more about StatefulSet here. A single deployment configuration is usually analogous to a single micro-service. io. Above is one example of a Deployment Strategy called Blue/Green. How Do Kubernetes Deployment and StatefulSets Work? Deployment. Create a service to expose the PostgreSQL database within the Kubernetes cluster, then create a file (e. Like a Deployment, a StatefulSet manages Pods that are based on an identical container spec. Storage for. It manages the deployment and scaling of a set of Pods, and provides guarantee about. This chart deploys Logstash as a statefulset. Attributes of a Highly Available WordPress Deployment. Deployment. kubectl basics. The example topology has a single primary server and multiple replicas, using asynchronous row-based replication. Kafka on K8s StatefulSet. From there, the StatefulSet Controller handles the. spec. g. Step-4: Creating the Deployment. It also guarantees the uniqueness and ordering of the pods. StatefulSet is the workload API object used to manage stateful applications. After reading thru Kubernetes documents like this, deployment, service and this I still do not have a clear idea what the purpose of service is. It allows you to define the Kubernetes Deployment or StatefulSet that you want KEDA to scale based on a scale trigger. A Kubernetes pod is a cluster deployment unit that typically contains one or more containers. They are listed below. v1. It is rather unlikely that you will ever need to create Pods directly for a production use-case. 10. Un StatefulSet es el objeto de la API workload que se usa para gestionar aplicaciones con estado. Let’s now create the Deployment using the kubectl apply command: $ kubectl apply -f deployment. Nodes. Specifying minReadySeconds slows down a rollout of a StatefulSet, when using a RollingUpdate value in . StatefulSets. It specifies that there should be three replicas of the Deployment and that each pod should be labeled with app: nginx. Note: This is not a production configuration. The StatefulSet controller is responsible for creating, scaling and deleting members of the StatefulSet. 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. storage. Deployments and ReplicationControllers are meant for stateless usage and are rather lightweight. 1 Answer. See Writing a Deployment Spec for more details. Many different settings impact Kubernetes API security, requiring significant knowledge to implement correctly. This topic was automatically closed 28 days after the. Step-7: Checking the environment variable. As mentioned above most of the time you can simply use volumes without the need to define StorageClass or PV/PVC. Then, the second pod (2) does likewise. For example, you define how many replicas ( pods) of your app you want to run in the. –How to Set Up a Kubernetes MySQL Deployment with Cloud Volumes ONTAP. It manages the deployment and scaling of a set of Pods, and provides guarantee about the ordering and uniqueness of these Pods. To deploy the PostgreSQL cluster, we will create a dedicated namespace named database. Các Pod của Statefuleset không hoàn toàn giống. The above command will create a ReplicaSet with three replicas and manage the lifecycle of the pods. Like a Deployment, a StatefulSet manages Pods that are based on an identical container spec. Let us see how StatefulSet differs from Deployment-1. In this article: What are Kubernetes Volumes and how they work with NFS. StatefulSets. Step-1: Defining a Secret. Different classes might map to quality-of-service levels, or to backup policies, or to arbitrary. yml Statefulset . I'm trying to define a shared persistent volume in k8s between two different deployments, and I've encountered some issues: I have 2 pods for each deployment and between the deployments I'm trying to configure a shared volume - that mean that if I create a txt file in deplyment1/pod1 and I take a look in deplyment1/pod2 - I can't see the file. This document describes the concept of a StorageClass in Kubernetes. Kubernetes (K8s) is one of the popular open-source container orchestration systems for automating deployment, scaling, and management of containerized applications. First, we run the service template : kubectl apply -f service. A testing group then utilizes these back doors to confirm the Blue pods pass validation. Next, you need to create a StatefulSet. Or the number of pods required to run your application properly based on the current usage. v1. Pods created by a StatefulSet have predictable names (and hostnames), unlike those created by a ReplicaSet . This causes the Pods of your Deployment to be restarted, in which case they read the updated ConfigMap. A StatefulSet is a controller that helps you deploy and scale groups of Kubernetes pods. A more complex use case is to run several identical replicas of a replicated service, such as web servers. Deploying workloads as StatefulSet helps provide features like unique. Deployments have two main disadvantages compared with StatefulSets and DaemonSets. It demonstrates how to create, delete, scale, and update the Pods of StatefulSets. In this documentation you will learn how HPA works, how to use it, what is. Learn how to run stateful applications on Kubernetes, understand how pods work in a StatefulSet, and see how to create a StatefulSet. io/pod-name: <POD_NAME>. 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. spec. A pod is the smallest deployable unit in Kubernetes which has a collection of containers. yaml. In a stateful containerized application, data must be persistent, retained and easy to access outside the application. This behavior doesn't apply when the entire StatefulSet is deleted and can be disabled by setting a StatefulSet's . Cloud Observability recommends running the OpenTelemetry Collector with the Prometheus receiver to ingest infrastructure metrics. Using Kubectl allows you to create, inspect, update, and delete Kubernetes objects. Application is deployed on K8s using StatefulSet because of stateful in nature. for all of your k8s troubleshooting needs, Komodor offers: Change. You can specify init containers in the Pod specification alongside the containers array (which describes app containers). Deployment: Pods have an ID that contains the. Therefore the latter use volumeClaimTemplates / claims on persistent volumes to ensure they can keep the state across component restarts. Deploying the Headless Service and. Deployment; ReplicationController; ReplicaSet; StatefulSet; In this case, make a note of the controller's . It starts the pods in a specific order (ascending numerically). It is the default strategy when . This comes at a cost of slow scale ups and. By default, Kubernetes runs one instance for each Pod you create. This page shows how to run a replicated stateful application using a StatefulSet.