Their purpose is to keep a set of identical pods running and upgrade them in a controlled way. StatefulSet. Each pod in the StatefulSet will need to have a service linking to it. StatefulSetCondition describes the state of a statefulset at a certain point. Deploy the Java service to Amazon EKS. You use StatefulSets when your pods need to maintain some sort of unique state -- for example, the volumeClaimTemplates section of the manifest means that each pod gets a unique PersistentVolumeClaim. Each new pod in statefulset then have a new PV attached to. yml service/redis-ss created. one replica pod will go down and the updated pod will come up. Learn basic concepts of StatefulSets and how to create StatefulSets on KubeSphere. One pod after another. ) What is Kubernetes StatefulSets? StatefulSet is a Kubernetes workload API object that can be used to manage stateful applications. Ordered, graceful deployment and scaling. extensions/created. The volumeClaimTemplates: will be used to create unique PVCs for each replica, and they have unique naming ending. Recreate Strategy. When pods run as part of a StatefulSet, Kubernetes keeps state data in the persistent storage volumes of the StatefulSet, even if the. e. Also, you will not have to create a PVCs in advance, and you will be able to scale it easily. There is also a general lack of understanding when it comes to disk access policies, what RWO/RWX means, and what they allow you to do. The StatefulSet controller uses this field as a collision avoidance mechanism when it needs to create the name for the newest ControllerRevision. With the clean service created, proceed to deploy it as shown below. As of Kubernetes v1. A Deployment provides the following functions: It allows you to define the. In case deployments is select,. It allows us to automate deployments, scale, and manage containerized applications. have the number of replicas in a text file (e. Related. spec. stateless applications. It should not be confused with vertical scaling, which means allocating. Deployment; StatefulSets; DaemonSets “Hay otro, el ReplicationController pero Kubernetes ahora apunta a Deployment que automáticamente crea ReplicaSets. kubernetes. StatefulSets make it easier to. StatefulSets can be used to create pods with a guaranteed start-up order and unique identifiers. Unlike in a standard Deployment, StatefulSets are aware that your application is stateful and will therefore treat it accordingly. Like a Deployment, a StatefulSet manages Pods that are based on an identical container spec. The deployment uses a selector to match labels defined in the pod template. By default, statefulsets start the first, then second, then third, etc. To start one replica it needs around 5 Minutes. In practice, StatefulSets are most commonly used to deploy databases (e. apps "web" created. ReplicaSet vs. currently we scaled one of our statefulsets to have 11 replicas. Deployment is best suited for stateless applications while StatefulSet is best suited for stateful applications. Kubernetes StatefulSet vs. There are two main options for orchestrating databases in Kubernetes: via StatefulSets or DaemonSets. Kubernetes Deployment vs. Having that you should preserve data on scaling events. In these circumstances you may have to reach for alternative deployment. Statefulsets implement this sticky identity in two ways: Predictable Pod Names: Statefulsets have fixed ordered name in the form of: ${statefulset-name}-{ordinal}. StatefulSets. K8s: Deployments vs StatefulSets vs DaemonSets. Orchestrating Databases in Kubernetes: StatefulSets vs DaemonSets. To create the MongoDB replica set, run these two commands: kubectl apply -f googlecloud\_ssd. Just like StatefulSets, Kubernetes Deployments let you define the state of the application, and the Deployment’s controller is responsible for maintaining this state. 25. Stable, unique network identifiers. file: redis-svc. In contrast to that, the Pods deployed by StatefulSet component are NOT identical and deployment is more complex. StatefulSets. StatefulSet est l'objet de l'API de charge de travail utilisé pour gérer des applications avec état (stateful). authorization. I want to deploy a single Pod on a Node to host my service (like GitLab for the example). Pods created by a StatefulSet have a unique and stable network identity. They keep unique identities for each Pod they manage and use the same identity when Pods need to be rescheduled. Grafana Enterprise. It has to match the labels assigned to the pods. The database and Kubernetes itself run on the same machines. There are many benefits. We set up and ran MongoDB as a StatefulSet, and examined the limitations and best practices while implementing StatefulSets. Similar to deployments, StatefulSets manage pods with identical container specifications. They differ in terms of maintaining a persistent identity for each pod. StatefulSets and DaemonSets StatefulSets . $ kubectl -n=mehdb apply -f app. yaml. The same thing can be done by using StatefulSets. In statefulsets each replica pod created has an index number starting from 0 and it will only setup the next replica if the previous one is running. 3. This comes at a cost of slow scale ups and scale downs for. Kubernetes deployments manage stateless services running on your cluster (as opposed to for example StatefulSets which manage stateful services). js application to five replicas. It manages the deployment and scaling of a set of pods, and provides a guarantee of ordering and uniqueness of the pods. Download and install a kubectl greater than v1. It’s easy to use and has a wide range of features, making it an ideal choice for managing applications in a production environment. What is the difference between StatefulSet and Deployment? Ans: A StatefulSet acts as a controller in Kubernetes that manages pods just like Deployments. 7) uses an update strategy to configure and disable. StatefulSets are valuable for applications that require one or more of the following. Before the deployment can start, there are some steps required to initialize your local environment:A DaemonSet runs a single pod on each node in the cluster, whereas a StatefulSet maintains a unique identity for each pod it manages. Users can deploy and maintain a set of highly available MySQL services in k8s based on StatefulSets, the process is relatively complex. Using volumeClaimTemplates, each replica will get a unique PersistentVolumeClaim with statefulset whereas all replicas would share the PersistentVolumeClaim with a deployment. Kubernetes Deployments vs StatefulSets (7 answers) Closed 2 years ago . In the same blog we used PersistentVolumeClaim for dynamic provisioning of PersistentVolume, but we used. 1. yaml>. It can appear that StatefulSet is a way to solve at most one instance in a situation with a network partition , but that is mostly in case of a stateful replicated application like e. StatefulSet vs. As name says statefulsets : In kubernetes if you are running the stateful application that time instead of deployment you have to use the statefulsets. 2. The simple scalable deployment is the default configuration installed by the Loki Helm Chart. There is a valid template in my answer, but you can't edit your deployment and modify it to statefulset. 05, 2023 Image: Shutterstock / Built In Kubernetes is a powerful container orchestration tool that provides a variety of resources for managing. StatefulSets are a pain in the neck when you need to do rolling updates or to upgrade your Kubernetes version, because they are not too easy to scale. To check your version of Kubernetes, run kubectl version. Deployment manages creating Pods by means of ReplicaSets. Share. What it boils down to is that Deployment will create Pods with spec taken from the template. Watch the presentation below given by Ali Kahoot, DevOps Engineer & Trainer at Tarabut Gateway. You would often use Statefulset if you want your. Each instance is created one by one, and Kubernetes waits for each one to be up and running before proceeding to the next. Kubernetes StatefulSets provide two main advantages (for stateful applications) over Deployments: a stable identity of the pods and the ability to follow specific Deployment orders. 0 version. Published on Sep. Deployment is used to deploy stateless applications. Before you begin Before you begin this tutorial, you should familiarize yourself with the following Kubernetes concepts: Pods Cluster DNS Headless Services PersistentVolumes PersistentVolume Provisioning The kubectl command line. io/v1beta1 metadata: name: deployer. It is responsible for the deploying, scaling of a set of Pods, and guarantees the ordering and uniqueness of these Pods. StatefulSets 1. You may notice two things here: (1) there is only one pod created while we asked for three, and (2) the pod name contains the StatefulSet name. KEDA will monitor that service and based on the events that occur it will automatically scale. Uses ReplicaSets for scaling and updates. Databases such as MySQL and PostgreSQL are examples of applications that are deployed using StatefulSets. A StatefulSet’s YAML manifest defines a template for its Pods. You can deploy Elasticsearch master nodes as Kubernetes Deployments or StatefulSets. system (system) Closed March 11, 2022, 6:44am 3. ReplicaSets fall short when used to deploy a stateful application because they treat all the Pods the same, give them random hostnames and IP addresses that change on restarts. yaml 384 clear 385 kubectl get pods 386 kubectl delete deploy my-dep 387 clear 388 kubectl get pods 389 clear 390 kubectl get pods 391 kubectl apply -f pod1. It strikes a balance between deploying in monolithic mode or deploying each component. They have different semantics while updating or when the pod becomes unreachable. All the examples available are showing Redis cluster being deployed as a combination of Kubernetes’ StatefulSets and PersistentVolumes. Using a statefulset also ensures that pods. The problem is : a Pod will not be re-created after the Node failure (like a reboot). 0 or above. This tutorial provides an introduction to managing applications with StatefulSets. StatefulSets Example. So in total we wait 55 Minutes just to fill up the capacity. Additionally, StatefulSets enables you to reschedule database pods to other nodes. Kubernetes is an open-source platform that automates the deployment, scaling, and management of containerized applications. This process requires users to familiarize themselves with various k8s resource objects, learn many MySQL operation details and maintain a set of complex management scripts. The most basic difference is that you would get ability to persist pod level state with statefulsets. This page explains how to deploy a stateful application using Google Kubernetes Engine (GKE). They have different semantics while updating or when the pod becomes unreachable. We will create the “ redis ” namespace then apply the file. You should not run a database (or other stateful workload) as Deployment, use StatefulSet for those. Published on Sep. StatefulSets are intended to be used with stateful applications and distributed systems. The operator defaults to creation of StatefulSets. DaemonSets. When you have an app which requires persistence, you should create a stateful set instead of deployment. Comme un Déploiement, un StatefulSet gère des Pods qui sont basés sur une même spécification. but there is a hick. There are two primary options for deploying a database on Kubernetes: StatefulSets and custom. Manages the deployment and scaling of a set of Pods, and provides guarantees about the ordering and uniqueness of these Pods. Although Kubernetes is best known for running applications, it's also capable of running databases. Here is a step by step tutorial on how to use StatefulSets and some basic operations on StatefulSets. For stateless applications, using Deployment objects is most suitable. Switch on the feature gate with the command line flag --feature-gates=StatefulSetMinReadySeconds=true on kube-apiserver and kube-controller-manager. This binded volume is claiming ressources through the persistent volume claim. Here is a step by step tutorial on how to use StatefulSets and some basic operations on StatefulSets. This tutorial will demonstrate Kubernetes StatefulSets as well as PodDisruptionBudgets, and PodAntiAffinity. Switch on the feature gate with the command line flag --feature-gates=StatefulSetMinReadySeconds=true on kube-apiserver and kube-controller-manager. TL;DR. A StatefulSet is better suited to stateful workloads that require persistent storage on each cluster node, such as databases and other identity-sensitive workloads. Their hostnames include their numerical replica identifier, allowing external applications to interact with the same replica after a Pod’s rescheduled. DaemonSets are designed to run background services that are required by the other containers in the cluster, such as logging and monitoring agents, while StatefulSets are used to run stateful applications. Create a StatefulSet file. They provide stable pod identity, persistent per pod storage and ordered graceful deployment, scaling and rolling updates. That's it! With these two commands, you have launched all the components required to run an highly available and redundant MongoDB replica set. 3343 Perimeter Hill Drive. Pods (and, by extension, containers) are, nevertheless, short-lived entities. It is roughly analogous to a Deployment, but tailored to stateful rather than stateless processes. Ordered Deployment and Scaling. Like a Deployment, a StatefulSet manages Pods that are based on an identical container specification. The solution(s) : Use a StatefulSet, ReplicaSet or DaemonSet to ensure the Pod creation after a Node failure. Unique network ID - A headless service controls the pod network identity. Requirements of Stateful Applications. Skaffold is a command line tool from Google that brings automation to the deployment workflow of Kubernetes applications. Ordered, graceful deployment and. But it's important to carefully evaluate whether your database is a good fit for Kubernetes and how best to make it work in a Kubernetes environment. This application is a replicated MySQL database. To update the deployment, modify the YAML file and run the same command again. They let you ensure that pods are scheduled in a specific order, that they have persistent storage volumes. Additionally, StatefulSets enables you to reschedule database pods to other nodes. What is the difference between Deployment and StatefulSet components? 🤔 Deployment vs StatefulSet component Pods deployed by Deployment are identical and. Comme un Déploiement, un StatefulSet gère des Pods qui sont basés sur une même spécification de conteneur. The kubectl apply -f used to apply the configuration file kubernetes (where your deploy your desired application). Share. “Hay otro, el ReplicationController pero Kubernetes ahora apunta a Deployment que automáticamente crea ReplicaSets”. Pods retain their identifiers even if they're restarted or scheduled onto another Node. For example, assume you are planning to deploy your Node. In addition to managing the deployment and scaling of a set of Pods, StatefulSets provide guarantees about the ordering and uniqueness of those Pods. Deployment is a resource to deploy a stateless application, if using a PVC, all replicas will be using the same Volume and none of it will have its own state. 申请转载. upgrades/terminations are done sequentially from the pod with the biggest index number to the pod with index number 0. StatefulSets ensure stable network identities and ordered pod deployment/termination, which is crucial for maintaining data integrity. Kubernetes Deployments Vs StatefulSets. be/ha3LjlD6g7g In this Kubernetes. Conclusion. Deploy The Stack. I've installed these components in the k8s cluster using the mixin kube-prometheus. StatefulSets. statefulsets do ordinal scheduling; first pod 0, then pod 1, etc. Modelling Stability with StatefulSets. I think statefulsets make sense for it. Deployments, StatefulSets, and DaemonSets allow you to scale up your Pods, roll out new images and configurations, and more. “Hay otro, el ReplicationController pero Kubernetes ahora apunta a Deployment que automáticamente crea ReplicaSets”. The labels are assigned in the “metadata” section in the deployment. pod名字包含随机数字 4. Specifying minReadySeconds slows down a rollout of a StatefulSet, when using a. A Kubernetes pod is a cluster deployment unit that typically contains one or more containers. A Kubernetes pod is a cluster deployment unit that typically contains one or more containers. Each new pod in statefulset then have a new PV attached to. The manifest files do not have the namespace added to them. Deployment controllers are suitable for managing stateless applications. For example, you define how many replicas ( pods) of your app you want to run in the deployment. Ordered, graceful deployment and scaling. yml. In order to understand how StatefulSet works, you first need to understand how database clusters work, as well concepts of Kubernets StatefulSet vs Deployment. Instead you create Deployments and StatefulSets where a controller takes care of that. yaml. In the case of deployment (Stateless services) the pods are interchangeable because if the pod needs to reschedule it wont maintain the same id as the previous pod. This is the expected behavior. You can use StatefulSets to deploy stateful applications and clustered applications that save data to persistent storage, such as Compute Engine persistent. To update the deployment, modify the YAML file and run the same command again. Here, in this example we are deploying a standalone. 🚀 KubeSphere v3. I will help you understand the use of Statefulsets, and also go through the differences between De. Pods are created and terminated in a predictable order, ensuring orderly scaling and rolling updates. To help deploy Pods, Kubernetes provides three different options: Deployments, DaemonSets, and StatefulSets. DaemonSets StatefulSets are Kubernetes resources that allow us to deploy and manage the stateful application. StatefulSet use at-most-X semantics and Deployments use at-least-X semantics, where X is number of replicas. We want to deploy service sets to machine "areas" so that services are running close to resources they manage. Build a new plugin or update an existing Teams message extension or Power Platform connector to increase users' productivity across daily tasks. You may notice two things here: (1) there is only one pod created while we asked for three, and (2) the pod name contains the StatefulSet name. If you need to use deployment instead of statefulset, just add kind: Deployment to the nodeSpecs. This is important because many stateful applications have data initialization routines to perform, masters to elect, and quorum to achieve. Deployment is a resource to deploy a stateless application, if using a PVC, all replicas will be using the same Volume and none of it will have its own state. Statefulsets use a volumeClaimTemplates array. 26 introduced a new, alpha-level feature for StatefulSets that controls the ordinal numbering of Pod replicas. While StatefulSet is used for stateful applications, Deployment component is used to deploy stateless. By far the most common way to run a database, StatefulSets is a feature fully supported as of the Kubernetes 1. 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. Just to avoid data corruption if you are changing the replica to more then one. Before we start discussing the details of this definition, notice that the file actually contains two definitions: the storage class that the StatefulSet is using and the. yaml. Editor’s note: this post is part of a series of in-depth articles on what's new in Kubernetes 1. Deployment vs. Grafana Cloud. For an even more than basic primer on StatefulSets, visit the Kubernetes documentation here. Overview of StatefulSets. 1 Like. You can also create Pods (containers) using the Deployment object in the Kubernetes cluster. StatefulSets are used when there is a need for uniqueness. To provision a static PV for a Deployment workload, the procedure is as follows: Note: The examples in this section. However, even when using the same name for the volume claim as before, it seems to be creating an. Related readingIn this article. Why use StatefulSets. Kubernetes Deployments Vs StatefulSets. The resource determines the behavior of the controller. First Note : The pod-template-hash label is added by the Deployment controller to every ReplicaSet that a Deployment creates or adopts. It is a simple application to start with since it does not require a complicated setup and it cannot be scaled. What then is the advantage of using StatefulSets?而因為有關聯，所以在Deployment下的Label Name，會同樣印在pod上。. Kubernetes provides StatefulSets, a type of controller or workload used to deploy and run stateful applications in a Kubernetes environment. g. js application and you want to scale the Node. a cache or database cluster even though it may solve your specific situation as. Pods deployed by Deployment are identical and interchangeable, created in random order with random hashes in their Pod names. Just make sure you have reclaimPolicy: Retain in your StorageClass definition. It makes sense also as each Redis instance relies on a configuration file that keeps track of other cluster instances and their roles. Why use StatefulSets. Stateful Applications in Kubernetes. There is a separate controller. Additional note: PVCs created by StatefulSets won't be deleted when deleting the StatefulSet as resource. 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. StatefulSets are Kubernetes resources that allow us to deploy and manage the stateful application. Let's see a StatefulSet in action and see whether it beings any benefits. e. 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. statefulset "mariadb" deleted. Key differences. Additionally, we are creating a Persistent Volume using the volumeClaimTemplate and using it in the StatefulSet to store the PostgreSQL data. 0 with new features and enhancements is available now. Hint: It starts at FREE. The solution(s) : Use a StatefulSet, ReplicaSet or DaemonSet to ensure the Pod creation after a Node failure. To summarize, we changed db Deployment into a StatefulSet, we added a command that creates MongoDB. Identities are defined as: - Network: A single stable DNS and hostname. yaml. In this video I explained about StatefulSet in Kubernetes, the differences between Deployment Vs StatefulSet in Kubernetes, Why do you need statefulset in Kubernetes, so you will understand Statefulset in Kubernetes completely. StatefulSets with Amazon EFS. They have different semantics while updating or when the pod. That's what happens with Pods when you create a Deployment, and it's a pattern which scales well. Ordered deployment, scaling and automated rolling updates. Unlike a. Deploying a MongoDB Database: Here is an example of how to deploy a MongoDB database using a StatefulSet in Kubernetes. 4. StatefulSet(stable-GA in k8s v1. It allows us to automate deployments,. Deployments configure apps in a generic way. Viewed 373 times. This is useful in cases where the deployment process is stalled or requires adjustments. Al igual que un Deployment, un StatefulSet gestiona Pods que se basan en una especificación idéntica de contenedor. The simple scalable deployment mode, is the preferred way to deploy Loki for most installations. Read stories about Statefulsets on Medium. Deployment. Stable, persistent storage. 2. Get Full-Length High-Quality DevOps Tutorials for Free - Subscribe Now. StatefulSet (stable-GA in k8s v1. For example, to create and check a service configuration for an Nginx application, use the following: kubectl expose deployment/nginx-app1. It is roughly analogous to a Deployment, but tailored to stateful rather than stateless processes. StatefulSets. Through StatefulSets, each Pod receives a stable, unique identifier, maintaining predictable and orderly deployment, which is indispensable for the. If you decide to use StatefulSets, note that it comes with a headless service per StatefulSet, generated for inter-cluster discovery. StatefulSets. This tutorial provides an introduction to managing applications with StatefulSets. This chart deploys Logstash as a statefulset. When comparing a Deployment vs Replica Set, the former provides the same replication functions (through Replica Sets) and also the ability to rollout changes and roll them back if necessary. Deployments and StatefulSets are the most common way to scale workloads with KEDA. MySQL, PostgreSQL, Redis, Elasticsearch) onto Kubernetes. (I don't use mine to create the deployment, just to patch the image tag) kind: ClusterRole apiVersion: rbac. metadata+: {. . Pods use a persistent volume claim as a request for storage that is matched to a persistent volume by the Kubernetes cluster. Deployments - Semaphore 24 May 2023 · Software Engineering Understanding ReplicaSet vs. yml secret/mysecret created. g. Pods (and, by extension, containers) are, nevertheless, short-lived entities. A StatefulSets are Kubernetes objects used to consistently deploy stateful application components. Reading Time: 4 minutes In Kubernetes we find different resources for deploying applications such as Deployment Statefulset daemonset In this blog, we will. 9, so your version doesn't has support for it. All the examples available are showing Redis cluster being deployed as a combination of Kubernetes’ StatefulSets and PersistentVolumes. In K8s, StatefulSets are a higher-level abstraction over pods that provide guarantees about the ordering and uniqueness of pods. Pods created as part of a StatefulSet are given persistent identifiers that they retain even when they’re rescheduled. References: The first referred URL (k8s SS) states explicitly: StatefulSets currently require a Headless Service to be responsible for the network identity of the Pods. This page shows how to run a replicated stateful application using a StatefulSet. StatefulSets - A StatefulSet is similar to a deployment in that one or more identical pods are created and managed. Kubernetes is an open-source platform that automates the deployment, scaling, and management of. Kubernetes StatefulSet simply explained | Deployment vs StatefulSet. Helm is a deployment orchestrator and includes pre and post hooks that can be used during an install or upgrade. StatefulSets are the native Kubernetes resources to manage stateful applications. Apr 6, 2020 at 8:53. As the world becomes increasingly digital, companies are turning to cloud-based solutions like Kubernetes to help manage their applications. You cannot manage to use ReadWriteOnce with deployment because it cannot scale. 5 and becoming stable in 1. We will take the example of Cassandra to learn about statefulset upgrade feature. Step 1. Use the right-hand menu to navigate. This is great for stateless apps that we want online, ASAP. Figure-3 captures the state of the Kubernetes cluster. Deployments and StatefulSets are the most common way to scale workloads with KEDA. Pods are a great way for you to deploy an application, but there is some limitation to the pod resource type. No guarantee of unique network identities or persistent storage. StatefulSets. yaml file first, so that even if our pod restarts or gets deleted, our data won. After successfully starting kube-apiserver and kube-controller-manager, you will see AvailableReplicas in the status and. Stateful applications are those which required persistent storage to work aptly. 那使用Deployments更重要的是，可以方便Rollback到之前版本，而使用StatefulSets、DaemonSets. Kubernetes Deployment vs. This sub-command will stop the current rollout and start a new one, using the current configuration settings. StatefulSets currently require a Headless Service to be responsible for the network identity of the Pods. Statefulsets is used for Stateful applications, each replica of the pod will have its own state, and will be using its own Volume. Find a wide-ranging variety of Deployment Vs Statefulset In Kubernetes Statefulset In Kubernetes Explained Stateless Stateful classified ads on our high-quality marketplace. Because Elasticsearch client nodes are stateless, you can deploy them as Kubernetes Deployments. See moreTL;DR. Here you can see how the Deployment itself runs a ReplicaSet that then runs 3 pods. Stable, unique network identifiers. My problem is that if I'm writing into Solr during a rolling update of the statefulset I get errors when I reach the deployment of the solr cluster leader. #72. Open this file in a code-editor and write the following code into it: apiVersion: apps/v1. is to have a global option setting for CF4K8s at installation time where is possible to specify if statefulsets vs. 3 Creating a StatefulSet; 8. apiVersion: v1 kind: Secret metadata: name: mysecret type: Opaque data: ROOT_PASSWORD: cGFzc3dvcmQ=. Deployments use ReplicaSets as a mechanism to orchestrate Pod creation, deletion, and updates. light vs. Some instructions on what kubeadm provides and how to deploy a Kubernetes cluster is. Published February 8, 2022. In this example, a custom Cassandra seed provider lets the database discover new Cassandra instances as they join the Cassandra cluster. Stable, persistent storage. Statefulsets, on the other hand, are useful when running workloads that require persistent storage. The key difference between stateful and stateless applications is that stateless. (This article is part of our Kubernetes Guide. 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. They both have self-healing. So by passing this flag to kubectl delete the Pods that are managed by. StatefulSet:. StatefulSets. Like a Deployment, a StatefulSet manages Pods that are based on an identical container spec. StatefulSets handle the deployment and scaling of sets of Kubernetes pods, providing guarantees about their uniqueness and ordering. Nashville, TN 37211. Example. This article contains best practices and guidance for running SQL Server containers on Kubernetes with StatefulSets. Ordered, automated rolling updates. According to kubernetes documentation about StatefulSets. Deployment vs. 3343 Perimeter Hill Drive. The following picture explains how scale down and scale up will happen in StatefulSets. Our current updateStrategy is. Let's deploy mehdb first.