Stateful vs. Uses ReplicaSets for scaling and updates. By default, Kubernetes deployment rollout history remains in the system so that you can roll back at any time. Why use StatefulSets. The pod template specifies the container image and port to be used for the application. Not all stateful applications scale nicely. DoK #49 Deployments vs. In this. The real distinctions of deployments vs statefulsets are: Ordering of pods. To create the deployment, run the following command: $ kubectl apply -f deployment. kubernetes. Step 1 - Create Kubernetes Environment. In a few minutes, there will be 5 MongoDB pods. Similarly, the deployment script. Horizontal scaling means deploying more pods in response to increased load. But Statefulsets eliminates the previous states and data stored problems. StatefulSets vs Deployments for stateless applications on Kubernetes. When you update the Pod template in a StatefulSet, the controller recreates the Pods with the updated template. It manages the deployment and scaling of a set of Pods, and provides guarantee about the ordering and uniqueness of these Pods. service都有ClusterIP,可以负载均衡 StatefulSet适合场景有状态的应用特点1. Thus, you have one SQL Server instance deployed per pod in the Kubernetes cluster. I have created a statefulset with 3 replicas with dynamic persistent volume claim with access mode as "Readwriteonce". 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. By far the most common way to run a database, StatefulSets is a feature fully supported as of the Kubernetes 1. #72. Statefulsets only provide a way to have unique naming e. 部署、扩展、更新、删除都要有顺序…. It has to match the labels assigned to the pods. A ReplicaSet (RS) is a Kubernetes object used to maintain a stable set of replicated pods running within a cluster at any given time. The deployment uses a selector to match labels defined in the pod template. They give Pods a stable identity and consistent ordering during scaling operations. In K8s, StatefulSets are a higher-level abstraction over pods that provide guarantees about the ordering and uniqueness of pods. StatefulSets create volumes on the fly using a volumeClaimTemplate. 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. Reading Time: 4 minutes In Kubernetes we find different resources for deploying applications such as Deployment Statefulset daemonset In this blog, we will. be/JGtJj_nAA2s Kubernetes Operator explained (manager for your stateful application 🚀) youtu. In conclusion, Deployment and StatefulSet are two powerful features of Kubernetes that allow you to manage the lifecycle of containerized applications. StatefulSet(stable-GA in k8s v1. Kubernetes Replication Controller vs Deployment Deployments are intended to replace Replication Controllers. We are going to need the affinity/anti-affinity settings. For example, if you have named a StatefulSet as web, the pods will be named in the order of web-0, web-1, and so on till n minus one. By default, Kubernetes uses the. This deployment mode is the easiest way to deploy Loki at scale. Deployment vs. Deployment manages creating Pods by means of ReplicaSets. This is a simple example of the above one. This tutorial provides an introduction to managing applications with StatefulSets. Step 1. An example of a stateful application is a database or key-value store to which data is saved and retrieved by other. 3343 Perimeter Hill Drive. Here you can see how the Deployment itself runs a ReplicaSet that then runs 3 pods. Let's be friends: Explore managing stateful applications with Kubernetes StatefulSets — when to use them, how to deploy MongoDB. The Kubernetes Control Plane is your cluster’s management surface. Key differences. 05, 2023 Image: Shutterstock / Built In Kubernetes is a powerful container orchestration tool that provides a variety of resources for managing containerized applications at scale. It demonstrates how to create, delete, scale, and update the Pods of StatefulSets. This article contains best practices and guidance for running SQL Server containers on Kubernetes with StatefulSets. There were no major changes to the API Object, other than the community selected name, but we added the semantics of “at most one. Deployment is best suited for stateless applications while StatefulSet is best suited for stateful applications. yaml with this way of working, it is easy to store the yaml-files in Git so you have full control of all changes and can revert/rollback. There is a valid template in my answer, but you can't edit your deployment and modify it to statefulset. Parallel pod management tells the StatefulSet controller to launch or terminate all Pods in parallel, and not to wait for Pods to become Running and Ready or completely terminated prior to launching or terminating another Pod. 9 release. 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. Published Oct 5, 2022 StatefulSets let you run stateful applications in Kubernetes. Why not to use the Statefulsets for stateless applications in Kubernetes ? As Stateful sets have the same capabilities as Deployment PVC, HPA, and others. Their purpose is to keep a set of identical pods running and upgrade them in a controlled way. Ordered, graceful deployment and scaling. In the last lesson, we skipped over the whys and wherefores of StatefulSets to focus on implementing Secrets. 05, 2023 Image: Shutterstock / Built In Kubernetes is a powerful container orchestration tool that provides a variety of resources for managing. Statefulsets, on the other hand, are useful when running workloads that require persistent storage. Its just not worth the risk to see if your app supports concurrent writes, so dont guess. Step 2. StatefulSetの概要. We need to specify service instances to be deployed to different boxes, anti-affinity on pods, for high availability. 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. A StatefulSet can deploy applications that need to reliably identify specific replicas, rollout updates in a pre-defined order, or. This sub-command will stop the current rollout and start a new one, using the current configuration settings. More info about statefulsets. See moreTL;DR. (順番を担保したデプロイとスケーリング) Ordered, automated rolling updates. In practice, StatefulSets are most commonly used to deploy databases (e. It should augment Running ZooKeeper, A Distributed System Coordinator but adds more details in debugging and more details regarding StatefulSets, Volumes, and PodAntiAffinity. 16 or above) deployments in cluster using Prometheus. but there is a hick. This service will need to be created with: selector: statefulset. A StatefulSet’s YAML manifest defines a template for its Pods. On the other hand, Jenkins is a stateful application. Now run the kubectl apply command to create the secret in Kubernetes. 1 Answer. Deployment Explained October 4, 2021 Topics: Cloud Volumes ONTAP, Elementary, Kubernetes What Is Kubernetes Deployment? A Deployment is a Kubernetes resource object used for declarative application updates. Using the Kubernetes Scheduler, the Deployment Controller runs replicas on any available node with available resources. When you have an app which requires persistence, you should create a stateful set instead of deployment. Pods created as part of a StatefulSet are given persistent identifiers that they retain even when they're rescheduled. A number of features intrinsic with the use of StatefulSets are the guarantees around deployment and scaling. The StatefulSet controller uses this field as a collision avoidance mechanism when it needs to create the name for the newest ControllerRevision. pod名字包含随机数字 4. kubectl delete -f <file. There are many benefits. The difference between StatefulSets and Deployments reflects the divide between stateful and stateless systems. StatefulSets are used for deploying stateful applications that require stable network identities and persistent data. StatefulSets: Orchestrating Stateful Applications. Let's deploy mehdb first. 26 introduced a new, alpha-level feature for StatefulSets that controls the ordinal numbering of Pod replicas. Statefulsets is used for Stateful applications, each replica of the pod will have its own state, and will be using its own Volume. For mysql i am using statefulset and the code is here: apiVersion: apps/v1 kind:Author: Matthew Cary (Google) Kubernetes v1. StatefulSets. While StatefulSet is used for stateful applications, Deployment component is used to deploy stateless. DaemonSets, StatefulSets and Deployments are three ways to deploy workloads in Kubernetes. By deploying pods in a specific order and maintaining persistent storage, StatefulSets provide a reliable and scalable platform for running stateful. FYI: You had the right approach in the beginning with Deployment + PVC. You may recall that the Deployment controller can perform the update in two ways, depending on the. You can also create Pods (containers) using the Deployment object in the Kubernetes cluster. As a result, sometimes other Kubernetes services compete with the stateful service over available resources. The resource determines the behavior of the controller. 5 Post deployment tasks; 8. As name says statefulsets : In kubernetes if you are running the stateful application that time instead of deployment you have to use the statefulsets. Verify that the Pods are running using the kubectl get pods command. Comparison. statefulset "mariadb" deleted. Ésta publicación muestra tres formas diferentes de implementar una aplicación en pods de Kubernetes. Deploy the Java service to Amazon EKS. g. pvc. What is Kubernetes StatefulSets. When you’re deploying an application in Kubernetes, you have a few options to choose from. updateStrategy: type: RollingUpdate. 3 Creating a StatefulSet; 8. They have different semantics while updating or when the pod becomes unreachable. Conclusion. Fully managed. StatefulSet is the workload API object used to manage stateful applications. 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. Deployment; StatefulSets; DaemonSets “Hay otro, el ReplicationController pero Kubernetes ahora apunta a Deployment que automáticamente crea ReplicaSets. A StatefulSet is better suited to stateful workloads that require persistent storage on each cluster node, such as databases and other identity-sensitive workloads. But some apps need a stable environment, where objects are created in a known order with fixed names. This tutorial provides an introduction to managing applications with StatefulSets. The problem is : a Pod will not be re-created after the Node failure (like a reboot). Like. StatefulSets and DaemonSets. 2 StatefulSet vs Deployment; 8. However, these StatefulSets configurations involve some complexity—so you must carefully plan your deployments before them carrying out. Both Pod and Deployment are full-fledged objects in the Kubernetes API. When the Grafana deployment becomes unstable due to crash looping, bugs, and so on, you can roll back a deployment to an earlier version (a REVISION). 而因為有關聯，所以在Deployment下的Label Name，會同樣印在pod上。. It is rather unlikely that you will ever need to create Pods directly for a production use-case. First, let's verify that StatefulSet has created the leader ( mehdb-0) and. Open this file in a code-editor and write the following code into it: apiVersion: apps/v1. The support for autoscaling the statefulsets using HPA is added in kubernetes 1. If you need to use deployment instead of statefulset, just add kind: Deployment to the nodeSpecs. If we deploy the statefulset from scratch, Kubernetes starts them one after another. com. Kubernetes (K8s) is an open-source container orchestration system. They guarantee stable and unique network identities, stable and persistent storage, and deployment and. Deploy it using the command below: $ kubectl apply -n test-namespace -f deployment. In addition to declarative scaling, StatefulSets also provide declarative updates, similar to Deployments. Editor’s note: this post is part of a series of in-depth articles on what's new in Kubernetes 1. The simple scalable deployment mode, is the preferred way to deploy Loki for most installations. You may need to delete the associated headless service separately after the StatefulSet. The same thing can be done by using StatefulSets. 2. Node、Podの障害時の挙動について. Stable, unique network identifiers. kubectl create -f statefulset. Labels, arguments and other things will always be updated on the Canary StatefulSet just like the stable StatefulSet. 5 (prior versions it was known as PetSets). Statefulset is a Kubernetes resource that handles pods that you need to hold a state. Deployment is used to deploy stateless applications. 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. This is true for both deployments and statefulsets (and pods, rcs, rss jobs, etc. They have different semantics while updating or when the pod. Just like StatefulSets, Kubernetes Deployments let you define the state of the application, and the Deployment’s controller is responsible for maintaining this state. Statefulsets. statefulsets do ordinal scheduling; first pod 0, then pod 1, etc. There is a separate controller. StatefulSets can be used to create pods with a guaranteed start-up order and unique identifiers. you can do that by entering the following command: touch example-statefulset. Here, in this example we are deploying a standalone. The helm docco provides a Job example run post-install via annotations. 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. These can be used to make sure that a pod. To update the deployment, modify the YAML file and run the same command again. They differ in terms of maintaining a persistent identity for each pod. StatefulSets DaemonSets There is one other type ReplicationController but Kubernetes now favors Deployments as Deployments configure ReplicaSets to support. イメージ的にはPodTemplateを持つDeploymentにPVCも追加した感じ。. Now let’s talk about StatefulSets. It maintains order when starting and stopping the pods. In order to understand how StatefulSet works, you first need to understand how database clusters work, as well concepts of Kubernets StatefulSet vs Deployment. Gestiona el despliegue y escalado de un conjunto de Pods, y garantiza el orden y unicidad de dichos Pods. Requirements of Stateful Applications. They both consume resources and can affect overall performance. 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. StatefulSets Example. Deployment Spec vs StatefulSet Spec Deployment specs and StatefulSet specs are quite similar. StatefulSets currently require a Headless Service to be responsible for the network identity of the Pods. Ordered, graceful deployment and scaling. As the name suggest the statefulsets are specifically used to make sure the app state is saved by each running pod. PVCs are not the only reason to use Statefulsets over Deployments. Create a StatefulSet file. Other examples of stateful applications include MySQL clusters, Redis, Kafka, MongoDB, and others. Statefulsets is used for Stateful applications, each replica of the pod will have its own state, and will be using its own Volume. These pods have a sticky identity, meaning that if a pod goes. In my understanding JGroups Cluster is designed to work with stable node identities like they are provided by statefulset. The list of stateful charts. TL;DR. StatefulSets with Amazon EFS. Elaborate more on this if we should never use Deployment. The simplest method to expose your services is to use a NodePort , in which case your service will take on the IP of the node externally with a high port number (30000+). StatefulSets. Use the right-hand menu to navigate. Kubernetes StatefulSets are used to deploy stateful applications inside your cluster. 5, StatefulSets is an API object that manages the deployment and scaling of a set of Pods and provides guarantees about the ordering and uniqueness of these Pods. This sticky characteristic makes it possible to run databases on. A. Our current updateStrategy is. 2. You should not run a database (or other stateful workload) as Deployment, use StatefulSet for those. 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. Deployments vs Daemonsets vs Statefulsets. A Kubernetes pod is a cluster deployment unit that typically contains one or more containers. For hostnames, stable network identifiers please refer to the statefulset basics: 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 A StatefulSet can use a Headless Service to control the domain of its Pods. id-0, id-1, id-2 and so on) for each of their Pods. Build a new plugin or update an existing Teams message extension or Power Platform connector to increase users' productivity across daily tasks. (I don't use mine to create the deployment, just to patch the image tag) kind: ClusterRole apiVersion: rbac. 9, have been widely used to run stateful applications. Amazon DocumentDB (with MongoDB compatibility) is a scalable, highly durable, and fully managed database service for operating mission-critical MongoDB-compatible JSON based workloads. Stateful Applications in Kubernetes. These are applications that can easily scale. 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. Deployment. Kubernetes Deployment vs. The list of stateful charts using a. You can use DaemonSet to run a cluster storage, log collection, and node monitoring demon on each node. I'll try removing some parts of the alertmanager deployment to identify the issue. headless service is necessary to create a stable DNS name for each pod. Then you will be able to set ingress and use it to redirect traffic based on path:. With a StatefulSet (as replicas are rescheduled) the naming convention, network names, and storage persist. statefulSet {. Deployments allow you to define the lifecycle of applications, including the container images they use, the number of pods and the manner of updating them. Deployment Vs Stateful sets. 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. IIRC this is different with Deployment related storage and could cause data loss if not cautious enough. The simple scalable deployment is the default configuration installed by the Loki Helm Chart. As their name suggests,. In Kubernetes, database applications deployed as StatefulSets are assigned pods with unique identities, such as db-0, db-1, and db-2. The solution(s) : Use a StatefulSet, ReplicaSet or DaemonSet to ensure the Pod creation after a Node failure. StatefulSets. 9) is a Kubernetes resource used to manage stateful applications. 27, this feature is now beta. –2. As with any. 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. Ordered, automated rolling updates. 7) uses an update strategy to configure and disable. Unlike a. StatefulSets are valuable for the applications that require one or more of the following, Stable, unique network identities. It allows you to define the Kubernetes Deployment or StatefulSet that you want KEDA to scale based on a scale trigger. To deploy the PostgreSQL cluster, we will create a dedicated namespace named database. Inter-pod affinity and anti-affinity can be even more useful when they are used with higher level collections such as ReplicaSets, StatefulSets, Deployments, etc. This can be done by updating the value of an annotation within the pod template. 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. This tutorial will demonstrate Kubernetes StatefulSets as well as PodDisruptionBudgets, and PodAntiAffinity. These rules allow you to configure that a set of workloads should be co-located in the same defined topology; for example, preferring to place two related Pods onto the same node. Overview. Deployments are usually used for stateless applications while StatefulSets are used for stateful applications. To create the MongoDB replica set, run these two commands: kubectl apply -f googlecloud\_ssd. To our surprise, new pods are not created for the Statefulsets while in a similar scenario news replicas were spun up for deployment sets. js application and you want to scale the Node. StatefulSets is a new feature and, as a result, running this example will require an environment based on Kubernetes 1. Users can deploy and maintain a set of highly available MySQL services in k8s based on StatefulSets, the process is relatively complex. yaml pod2. We will use the gce-pd storage to store the data. A StatefulSets are Kubernetes objects used to consistently deploy stateful application components. If your application doesn't require any of these, you should deploy your application using a Deployment. @Jarek the question was more whether you can technically use a normal service for a StatefulSet. I'm using Logstash on Kubernetes and use the official Helm chart at this link. To demonstrate just how pervasive the problem is, one can compare the list of charts using a StatefulSet vs a Deployment. It dictates the needs of dedicated volumes, unique hostname records, and a specific order of deployment. A. StatefulSet: Key Differences. 3343 Perimeter Hill Drive. The key difference between stateful and stateless applications is that stateless. Deployment. After kubernetes 1. While a StatefulSet keeps a unique identity for each Pod it manages. Manages the deployment and scaling of a set of Pods, and provides guarantees about the ordering and uniqueness of these Pods. . The deployment is made up of 2 Nginx web servers; both of them are connected to a persistent volume. This series walks you through: Building a Kubernetes cluster on cloud providers. It allows us to automate deployments, scale, and manage containerized applications. 2. , where managing state is a crucial part of the application functionality. yaml file first, so that even if our pod restarts or gets deleted, our data won. This chart deploys Logstash as a statefulset. 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. We can use the kubectl describe secret command to display additional information about the resource. 1 Answer. Pod Management. Pricing. In summary, StatefulSets are great building blocks for running stateful workloads on Kubernetes. There seems to be a recurring bad practice among the charts in this repository: using a Deployment to manage pods using Persistent Volume Claims, rather than the proper StatefulSet. yaml kubectl apply -f mongo-statefulset. Let's see a StatefulSet in action and see whether it beings any benefits. When using Kubernetes, most of the time you don’t care how your pods are scheduled, but sometimes you care that pods are. In StatefulSets, the pods get created as well as deleted in a specific order. The same thing can be done by using StatefulSets. You can use StatefulSets to deploy stateful applications and clustered applications that save data to persistent storage, such as Compute Engine persistent. ReplicaSet vs. It demonstrates how to create, delete, scale, and update the Pods of StatefulSets. It should not be confused with vertical scaling, which means allocating. If you update a StatefulSet, it also performs RollingUpdate i. StatefulSets A StatefulSet is a workload API object for managing stateful applications. It manages the deployment and scaling of a set of Pods, and provides guarantee about. StatefulSets vs. StatefulSet vs. They both have self-healing. 0 version. Kubernetes provides Deployments for managing application orchestration. Suppose you see the pods using the kubectl get pods command. This comes at a cost of slow scale ups and. yaml. ) What is Kubernetes StatefulSets? StatefulSet is a Kubernetes workload API object that can be used to manage stateful applications. StatefulSet is the workload API object used to manage stateful applications. You should delete the deployment and then create new statefulset. Statefulsets. Side note, you may consider deploying your SQL using Helm because someone else has already solved many of these issues using a chart so you don't have to. How do they differ while persisting data. When pods run as part of a StatefulSet, Kubernetes keeps state data in the persistent storage volumes of the StatefulSet, even if the. file: redis-svc. Deployment. After successfully starting kube-apiserver and kube-controller-manager, you will see AvailableReplicas in the status and minReadySeconds. RollingUpdate: The RollingUpdate update strategy implements automated, rolling update for the Pods in a StatefulSet. [email protected] VS Deployment. Note: This is not a production configuration. A Deployment, on the other hand, is. 安定したネットワーク識別子. What then is the advantage of using StatefulSets?1. To monitors kubernetes (version 1. Otherwise, using StatefulSets will help ensure a number of requirements can be met for your stateful app. A StatefulSet is a set of pods with a unique, persistent hostname and ID. A number of features intrinsic with the use of StatefulSets are the guarantees around deployment and scaling. Read stories about Statefulsets on Medium. As opposed to the Deployment, the StatefulSet creates pods directly. Unlike a Deployment, a StatefulSet maintains a sticky identity for each of. Para entender por qué aplicar un objeto de tipo Statefulset en lugar de Deployment, antes de nada necesitamos conocer las diferencias básicas entre Stateless y Stateful. What is the difference between them. 2) Control Plane. Step 1. CPU requests are mostly more important for the kube-scheduler to identify the best node suitable to place a pod. Pods (and, by extension, containers) are, nevertheless, short-lived entities. You should not run a database (or other stateful workload) as Deployment, use StatefulSet for those. As a result, sometimes other Kubernetes services compete with the stateful service over available resources. Free Forever plan: 10,000 series metrics;. StatefulSets. Figure-3 captures the state of the Kubernetes cluster. In a production environment it is better to use a declarative operation, e. StatefulSets in Kubernetes is a great feature to deploy and scale pods in Kubernetes. Stateful applications save data to persistent disk storage for use by the server, by clients, and by other applications. It is responsible for the deploying, scaling of a set of Pods, and guarantees the ordering and uniqueness of these Pods. Hint: It starts at FREE. e. StatefulSets are particularly useful when you have stateful applications, such as databases, that require stable network identities and persistent storage. StatefulSet doesn’t provide any guarantee to delete all pods when StatefulSet is deleted, unlike deployment, which deletes all pods associated with deployment when the deployment is deleted. This binded volume is claiming ressources through the persistent volume claim. Check the status of the Deployment using the kubectl get deployments command. OK, so back to Deployment with PVC or StatefulSet with PVC. Here are some main differences between Deployments and StatefulSets: Deployments are used for stateless applications whereas StatefulSets for stateful applications. StatefulSets and PDBs. Provision a Static PV for a Deployment Workload. It allows you to define the Kubernetes Deployment or StatefulSet that you want KEDA to scale based on a scale trigger. It manages the deployment and scaling of a set of pods, and provides a guarantee of ordering and uniqueness of the pods. It can manage the scaling and deployment of a collection of. A StatefulSet is a controller that helps you deploy and scale groups of Kubernetes pods. This means that each Statefulset replica does have its own PersistentVolumeClaim object. 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. Because Elasticsearch client nodes are stateless, you can deploy them as Kubernetes Deployments. If you decide to use StatefulSets, note that it comes with a headless service per StatefulSet, generated for inter-cluster discovery. Deployment. Oct 12, 2020 Deployments vs StatefulSets in Kubernetes Deployments vs StatefulSets TL;DR Deployments are usually used for stateless applications while StatefulSets are. Why use StatefulSets. If your application is stateless, you should use Deployment and not StatefulSet. Kubernetes (K8s)is an open-source container orchestration system. Deployment in Kubernetes Statefulset in Kubernetes. To summarize, we changed db Deployment into a StatefulSet, we added a command that creates MongoDB. $ kubectl -n=mehdb apply -f app. However, the administration of stateful applications and distributed. 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. This is the expected behavior. In case deployments is select,. For example, assume you are planning to deploy your Node. DaemonSet vs. In this article.