Guy Barrette teaches this Docker Containers and Kubernetes Fundamentals course for beginners. If a Node is added, the DaemonSet will automatically add a Pod to that Node. For example, If you create a deployment with 1 replica, it will check that the desired state of ReplicaSet is 1 and current state is 0, so it will create a ReplicaSet,. The exercises in this task demonstrate a strategic merge patch and a JSON merge patch. For example you want to run nginx pod on every node with clustersize equal to 4 then you have. Nota: hoy en día la forma recomendada de configurar la replicación es con un Deployment que configura un ReplicaSet. kubectl label node <node-name> key=value. Ví dụ: Nếu bạn tạo StatefulSet với bộ đếm tên (counter), nó sẽ tạo một pod với tên counter-0 và cho nhiều bản sao của một statefulset. DaemonSets are commonly used to deploy special programs that run in the background, performing tasks such as monitoring and logging. Let’s understand the terminology and basic entities of Kubernetes cluster. What is ReplicasSets? A ReplicaSet is a process that runs multiple instances of a Pod and keeps the specified number of Pods constant. The Deployment controller creates ReplicaSets which means a bunch of the same pods, same everything, just scheduled individually. Conforme se añade más nodos al clúster, nuevos Pods son añadidos a los mismos. 1. Each rollback updates the revision of the Deployment. Each new ReplicaSet updates the revision of the Deployment. You can not control its replica using scale option. 式的定义方法，在 Deployment 对象中描述一个期望的状态，Deployment 控制器就会按照一定的控制 速率把实际状态改成期望状态，通过定义一个 Deployment 控制器会创建一个新的. . DaemonSet. --. If you subsequently create a new DaemonSet with the same selector, the new DaemonSet adopts the. StatefulSets vs. What is the difference between a StatefulSet, a Deployment, and a DaemonSet? Stateful vs. The key difference between stateful and stateless applications is that stateless applications don’t “store. Deployments and Deployment Configurations. 5. This page shows how to run a replicated stateful application using a StatefulSet. You need to specify 2 nodes on which you want lagstash should run using node selector, so pods will be scheduled on those two nodes only. Guy is a developer & trainer with more than 25 years of experience. resources that can be "rolled out" (see kubectl rollout -h). These might be fundamental to the operation of your cluster, such as a networking helper tool, or be part of an add-on. yaml to update the cluster with your changes. A ReplicaSet is probably one of the first concepts that you’ll learn, cause it’s such an important part of what you can achieve with. sharma@knoldus. The child field matchLabels of the selector field is used to identify the pod and a replica field is used to indicate how many pods should be maintained. Al eliminar un DaemonSet se limpian todos los Pods que han sido creados. Its purpose is to maintain the specified number of Pod instances running in a cluster at any given time to prevent users from losing access to their application when a Pod fails or is inaccessible. Managing workload objects. 式的定义方法，在 Deployment 对象中描述一个期望的状态，Deployment 控制器就会按照一定的控制 速率把实际状态改成期望状态，通过定义一个 Deployment 控制器会创建一个新的. ) One thing of note, we use. kubectl rollout status ds/datadog -n default. Submit and view feedback for. ReplicaSet: StatefulSet is also a Controller but unlike Deployments, it doesn’t create ReplicaSet rather itself creates the Pod with a unique naming convention. Use a Job instead of a ReplicaSet for Pods that are expected to terminate on their own (that is, batch jobs). This name will become the basis for the ReplicaSets and Pods which are created later. field that defines the number of Pods to run. 1. DaemonSet là một dạng dịch vụ quản lý các Pod hoạt động với chức năng khá là riêng biệt bằng cách đảm bảo Pod dịch vụ sẽ được chạy trên toàn bộ các Node trong một Kubernetes Cluster (hoặc trên một số Node cụ thể trong Kubernetes. A Deployment provides declarative updates for Pods and ReplicaSets. Kubernetes DaemonSet benefits. @jevgenij-alterman @posquit0 the reason is simple: you don't need a high number of NGINX instances to handle high volumes of traffic and most importantly, you need to keep in mind that each instance of the ingress controller needs to reach the kubernetes API server. If you subsequently create a new DaemonSet with the same selector, the new DaemonSet adopts the existing Pods. A Deployment is used to spin and scale stateless applications while saving the state of the ReplicaSet it manages in a persistent volume, so that all pod replicas share the same volumefunc NewForConfigAndClient (c * rest. Current Behavior. Gunakan DaemonSet alih-alih ReplicaSet untuk Pod yang menyediakan fungsi pada level mesin, seperti monitoring mesin atau logging mesin. If a DaemonSet Pod must run on specific Nodes, instead of all Modes, label selectors help identify the Nodes to run on. The replicaset scrapes everything else such as kube-state. A daemonset can be used to run replicas of a pod on specific or all nodes in an OpenShift Container Platform cluster. DaemonSet is a Kubernetes controller used for cluster-level operations, ensuring that a specific Pod runs on every node in the cluster. Although they had ReplicaSet, DaemonSet is the K8 object they added. e. StatefulSets, DaemonSets, and Deployments are different ways to deploy pods in Kubernetes. Ordering: Kubernetes StatefulSet ensures that each pod is created in a specific order, while Deployment does not. This agent is being renamed from OMSAgent to Azure Monitor Agent. Philadelphia 76ers Premier League UFC. From a configuration perspective, DaemonSet is similar to a ReplicaSet or a Deployment. ReplicaSet: StatefulSet is also a Controller but unlike Deployments, it doesn’t create ReplicaSet rather itself creates the Pod with a unique naming convention. Copy. A ReplicaSet's purpose is to maintain a stable set of replica Pods running at any given time. Gestiona el despliegue y escalado de un conjunto de Pods, y garantiza el orden y unicidad de dichos Pods. The timer starts once the status condition of. Note: If --to-revision flag is not specified, kubectl picks the most. Possible Solution 2: set minAvailable to quorum-size (e. Then, list all the deployments in your cluster with the command: kubectl get deployments. It is used to automatically replace any pods that fail, get deleted, or are terminated, ensuring the desired number of replicas are always available to serve requests. g. Estos Pods tienen un ciclo de vida. ReplicaSet . 1 --local -o yaml > definition-updated. The DaemonSet scrapes any node-level targets such as cAdvisor, kubelet, and node exporter. If a node is added/removed from a cluster, DaemonSet automatically adds. Kubernetes API is growing day by day and they are adding new features every day. stateless applications. ReplicaSet will ensure that no. Create a DaemonSet. spec. Deployments - Semaphore Like Comment Share Copy; LinkedIn; Facebook; Twitter; To view or add a comment. Image source: getdbt. For a particular service. 1 Create. DaemonSet vs. # kubectl delete rs soaktestrs replicaset "soaktestrs" deleted # kubectl get pods Again, the pods that were created are deleted when we delete the Replica Set. A ReplicaSet is probably one of the first concepts that you’ll learn, cause it’s such an important part of what you can achieve with Kubernetes, but shouldn’t be confused with a DaemonSet; also a critical feature. Kubectl is a command line tool used to run commands against Kubernetes clusters. When updates are applied, deployment creates a new replicaset and creates new pods. A DaemonSet deploys pods to all nodes in the cluster. Otherwise, the DaemonSet Controller A control loop that watches the shared state of the cluster through the apiserver and makes changes. These pods have a lifetime that is tied to a machine lifetime: the pod needs to be running on the machine before other pods start, and are safe to terminate when the machine is. Also, the DaemonSet controller will use the original template the next time a node (even with the same name) is created. Building on replication controllers, OpenShift Container Platform adds expanded support for the software development and deployment lifecycle with the concept of deployments. Un DaemonSet garantiza que todos (o algunos) de los nodos ejecuten una copia de un Pod. Each new ReplicaSet updates the revision of the Deployment. . 那在PVC上，DaemonSet與Deployment是一樣的，共同. Job. These pods occupy resources within a node, so the autoscaler doesn’t consider them as idle. DOCKER. DaemonSet, Deployment, StatefulSet, and ReplicaSet resources will no longer be served from extensions/v1beta1, apps/v1beta1, or apps/v1beta2 in v1. There is no difference between Replication Controller and Deployment for this case (after all a Deployment is just a wrapper around a Replica Set). We can use nodeSelector to run the pods on some specific nodes. The ingress section defines incoming traffic rules while the egress section defines. The OneAgent container must be started and the. Share. Si creamos una Deployment con 1 réplica, primero se crea un ReplicaSet que compara el estado deseado con el estado actual, si el DESIRED es 1 y el CURRENT es 0, se crea un POD para igualar ambos. replicas: 2 a new ReplicaSet is created, and it observes the. You can create, manage, and delete objects using imperative and declarative methods. Watch the presentation below given by Ali Kahoot, DevOps Engineer & Trainer at Tarabut Gateway. StatefulSet vs. Let’s start by looking at the difference between a stateful and stateless application. Last modified August 24, 2023 at 6:38 PM PST: Use code_sample shortcode instead of code shortcode (e8b136c3b3) A DaemonSet defines Pods that provide node-local facilities. ·. Read the DaemonSet object definition to understand the API for daemon sets. Another benefit of utilizing a Daemonset is that, in the event you add a node to the cluster, then the Daemonset will mechanically spawn a pod on that node, which a deployment is not going to do. Each rollback updates the revision of the Deployment. For security reasons, only cluster administrators can create daemonsets. spec, indique que les pods exécutent un conteneur, nginx, qui utilise l'image nginx Docker Hub à la version 1. Daemonset. , the byte at offset x in the pseudo-file is the same as the byte at address x in the process. 0. It is a controller that ensures that a specified number of pod replicas are running at any given time. YAML of RC Vs RS. A DaemonSet is a Kubernetes resource that ensures a specified Pod runs on all nodes or a specific subset of nodes in a cluster. To remove a DaemonSet, use the kubectl delete command (for example, kubectl delete –f example-daemon. Persistent storage: Kubernetes StatefulSet can manage the creation and deletion of PVCs while. 2 Answers Sorted by: 4 Replica Controller Vs Replica Set The functionality of both Replica Controller and Replica Set are quite the same - they are responsible to. The Deployment creates a ReplicaSet that creates three replicated Pods, indicated by the . The Deployment creates a ReplicaSet that creates three replicated Pods, indicated by the . What is deployment? Package deployment contains all the logic for handling Kubernetes Deployments. It is declarative and can be used for rolling updates of micro. Pod と ReplicaSet の関係は疎結合になっている。. Share. A DaemonSet ensures that all (or some) Nodes run a copy of a Pod. For this the recommended approach is to use a Deployment, which under the hood create a ReplicaSet. Daemonsets are also used for deploying one Pod per. Understanding ReplicaSet vs. 3 Answers. Nota: Los StatefulSets son estables (GA) en la versión 1. This can. Tolerations are applied to pods. metadata. Figure 6: Group of requests in a DaemonSet and single concern for Sidecar. Also, static Pods may be deprecated in the future. DaemonSet Use a DaemonSet instead of a ReplicationController for pods that provide a machine-level function, such as machine monitoring or machine logging. io docs - daemonset Although they had ReplicaSet, DaemonSet is the K8 object they added. Kubernetes DaemonSet Example YAML. DaemonSets are great for running a single instance of an application on every node in the cluster. This included ReplicationController, ReplicaSet, StatefulSet, DaemonSet, and Deployment. We just published a 6-hour course on the freeCodeCamp. StatefulSet is also a Controller but unlike Deployments, it doesn’t create ReplicaSet rather itself. From my understanding replicaset ensures there is only a set amount of. Delete namespace. It is the right controller for the job of deploying one Pod per node. Now get the Pods list using the following command. All three of these are defined via YAML configuration. The DaemonSet pods scrape targets solely on the node that the respective pod is deployed on, such as node-exporter. affinity. FEATURE STATE: Kubernetes v1. A new ReplicaSet is created and the Deployment manages moving the Pods from the old ReplicaSet to the new one at a controlled rate. Every change is a new version. The application pods use the service mesh pod on the same node as a proxy for all requests. If you have recently updated your Kubernetes version and all of a sudden your YAML files stopped working, for Daemonset or for Deployment or maybe your Replicaset YAML file started giving the error: no matches for kind "DaemonSet" in version "extensions/v1beta1. StatefulSets address this by guaranteeing that each Pod in the ReplicaSet maintains its identity. recommended Deploy Dynatrace Operator in classic full stack mode. 11. What is changing? When customers enable Container Insights, Azure Monitor deploys a containerized collection agent. As a DaemonSet to ensure that there’s a running instance on each node of the cluster. daemonset. Por ejemplo, si creamos un StatefulSet con el nombre counter, se creará un pod con el nombre counter-0, y para múltiples réplicas de un StatefulSet, sus nombres se incrementarán. StatefulSet vs. In Kubernetes, containers are assigned to pods, which are abstractions of the containers' required hosting resources. 43. You can see it by running: $ sudo microk8s kubectl get daemonset -n ingress nginx-ingress-microk8s-controller -o yaml. It will show three Pods. StatefulSet (stable-GA in k8s v1. DaemonSet. "Cannot Delete DaemonSet-managed Pods" Pods that are part of daemon sets pose a challenge to evictions. Comparisons: ALB vs NLB in AWS — Application load balancer vs Network load balancer. The Replication Controller uses equality-based selectors to manage the pods. kubernetes. DaemonSet kubernetes. Khác với ReplicaSet, số lượng replica không cần. In Kubernetes, you do not create ReplicaSets directly. There is one other type ReplicationController but Kubernetes now favors Deployments as Deployments configure. ReplicaSet 是下一代的 Replication Controller。 ReplicaSet 和 Replication Controller 的唯一区别是选择器的支持。ReplicaSet 支持新的基于集合的选择器需求，这在标签用户指南中有描述。而 Replication Controller 仅支持基于相等选择器的需求。 怎样使用 ReplicaSet 大多数支持 Replication Controllers 的kubectl命令也支持 ReplicaSets. Check. com 3Add a comment. Create a deployment. kubectl scale deployment my-deployment --replicas=3. Pods are assigned to nodes, which provide actual hosting resources, such as physical or virtual machines. kubectl get pods Scaling Application: We can scale the application after created in various ways. These are controlllers which are used to ensure that our pod runs on every node when its deployed. Kubernetes Replication Controller Vs Deployment This is the same behavior of DaemonSet in Kubernetes version 1. Posted on 14/05/2021. Step 4. How Deployments, Statefulsets & Daemonsets work. 25. DaemonSet vs. you should not normally create any pods whose labels match this selector, either directly, with another ReplicationController, or with another controller such as Job. All pods, daemonset, deployment and replicaset related to calico is in NOT READY state. As nodes are added to the cluster, Pods are added to them. A side note!Understanding ReplicaSet vs. scale it down to zero and then to the number of pods you required (guess it equals to 3) kubectl scale deployment <deployment-name> --replicas=0 -n <namespace> kubectl scale deployment <deployment-name> --replicas=3 -n <namespace>. Deployment and ReplicaSet — to manage a stateless application workload on a cluster,. If you use ReplicaSet instead, you need to. In a StatefulSet, each pod is given a name and treated individually, in contrast to a Kubernetes Deployment, where pods are easily replaceable. StatefulSet vs. A ReplicaSet delegates local container restarts to some agent on the node such as Kubelet. # deployment name and namespace deployment_name=mydeployment deployment_ns=mynamespace # get replica set identifier for deployment dep_rs=$. ttlSecondsAfterFinished field of a Job, as in this example. @Jonas I did. Then take note of the Controlled By field. A new ReplicaSet is created and the Deployment manages moving the Pods from the old ReplicaSet to the new one at a controlled rate. replicaset vs deployment: What are the differences? Developers describe replicaset as "Production-Grade Container Scheduling and Management". By default, Kubernetes creates a default namespace for resources that do not have a namespace. As I understand the purpose of the Kubernetes Controller is to make sure that current state is equal to the desired state. yaml file to make it easy to swap out images. DaemonSet. # kubectl delete rs soaktestrs replicaset "soaktestrs" deleted # kubectl get pods Again, the pods that were created are deleted when we delete the Replica Set. For example, let’s say you want to label a node as. DaemonSets are used to deploy system daemons such as log collectors and monitoring agents, which typically must run on every node. The Azure Monitor Agent replicaset pods are running. As per Kubernetes docs :-. A DaemonSet is a higher-level abstraction designed to ensure that a specific pod runs on all nodes in a cluster or on a subset of nodes based on specified criteria. Deployments. DaemonSet — to manage pods that must run on each cluster node, including existing and future nodes. Replication controller is kinda imperative, but replica sets try to be as declarative as possible. DaemonSet is a k8s construct that allows exactly one instance of pod running in each node in the cluster. DaemonSet vs. The solution(s) : Use a StatefulSet, ReplicaSet or DaemonSet to ensure the Pod creation after a Node failure. or via another workload resource such as ReplicaSet. This wouldn’t be possible if a Deployment or ReplicaSet was used, as scheduling or replication changes would. Then you are at the right place. ReplicaSet VS DaemonSet. V tutorialu popisujeme 3 různé způsoby (Deployment, StatefulSet a DaemonSet), jak provádíme deploy aplikací v K8s – včetně praktické ukázky. Le champ template contient les sous-champs suivants:. When you updated the Deployment, it created a new ReplicaSet (nginx-deployment-1564180365) and scaled it up to 1 and then scaled down the old ReplicaSet. DaemonSet. Trivy Github Security Scan. A DaemonSet ensures that all (or some) Nodes run a copy of a Pod. DeamonSetとは. When a Deployment is changed, a new ReplicaSet is created. Each new ReplicaSet updates the revision of the Deployment. DaemonSet. To remove a DaemonSet, use the kubectl delete command (for example, kubectl delete –f example-daemon. selector. Replicate Kubernetes Ingress using plain Nginx and Docker Compose in less than 5 minutes #kubernetes #ingress #nginx #docker #dockercompose #proxy…Day 23- Kubernetes DaemonSet #kubernetes #daemonset #keyfeatures #usecases #handson Client Certificates for Normal Users. 2. 1 Answer. Daemonset ensures that only one copy of the specific pod is in all the nodes in the cluster. A Daemonset ensures that all or some nodes inside the cluster run a copy of a Pod. Look at both the Labels and the Selectors fields. As nodes are added to the cluster, Pods are added to them. At most one pod of the. ; Créez un conteneur et nommez-le nginx en utilisant le. Alternatively, you can just use the kubectl autoscale command to accomplish the same (and it's easier!)Before getting started it is important to understand how Fluent Bit will be deployed. In Kubernetes 1. Horizontal Pod Autoscaling. Whenever a node is added to the cluster, the DaemonSet controller checks if it is. Understanding ReplicaSet vs. DaemonSet controller will create Pods on nodes that match the node selector’s key and value. Use a DaemonSet instead of a ReplicaSet for Pods that provide a machine-level function, such as machine monitoring. Once tied, the referrers' names will change alongside the target name via transformers like namePrefix and nameSuffix Usage ; The syntax nameReference should be written in the. Except for the out-of-resources condition, all these conditions should be familiar to most users; they are not specific to Kubernetes. 아울러 이들의 실행 구역을 논리적으로 분할하는 네임스페이스(Namespace)의 역할도 함께 들여다 본다. Use a Job instead of a ReplicaSet for Pods that are expected to terminate on their own (that is, batch jobs). replicaSets(). StatefulSet is the workload API object used to manage stateful applications. 14 [stable] Pods can have priority. Does not matter in which worker node they are running. Television. A request for a time-sliced GPU provides shared access. Podの雛形 (Pod Template)を定義し、Label Selectorという方法で管理対象を. DaemonSet is similar to Deployment, ReplicaSet, and StatefulSet which manages the pods. The main difference between a Replica Set and a Replication Controller right now is the selector support. Pod ini memiliki waktu hidup yang bergantung terhadap waktu hidup mesin: Pod perlu untuk berjalan pada mesin sebelum Pod lain dijalankan, dan aman untuk diterminasi ketika mesin siap untuk di-. When I created a replicaset and a replication controller the replicaset didn't delete the replication controller's pods and I'm trying to understand why. A DaemonSet might be fundamental to the operation of your cluster, such as a plugin to let that node access cluster networking , it might help you to manage the node, or it could provide less essential facilities that enhance the container. Deploy the DaemonSet with the command: kubectl apply -f datadog-agent. Existing persisted data can be. The agent consists of a deployment with one replica and DaemonSet for scraping metrics. schedulerName field of the DaemonSet. StatefulSet vs. 28. Each new ReplicaSet updates the revision of the Deployment. yaml’, and we will be submitting this file to the Kubernetes cluster. When a DaemonSet is deleted, Kubernetes removes all the pods created by it. In this case, all DaemonSet objects are reconciled each time a Node is created. 1. Every time you create a Deployment, the deployment creates a ReplicaSet and delegates creating (and deleting) the Pods. Kubernetes manages a cluster of nodes, so our log agent tool will need to run on every node to collect logs from every POD, hence Fluent Bit is deployed as a DaemonSet (a POD that runs on every node of the cluster). Job. A DaemonSet creates a replica on each worker node by default. Next, set the context for your Kubernetes cluster using the command: kubectl config use-context [context-name] Step 3. Understanding ReplicaSet vs. If a Pod cannot be scheduled, the scheduler tries to preempt (evict) lower priority Pods to make scheduling of the pending Pod possible. A pipe is a form of redirection (transfer of standard output to some other destination) that is used in Linux to send the output of one command to another for further processing. yaml. 5 min read. If you specify --cascade=orphan with kubectl, then the Pods will be left on the nodes. apiVersion: apps/v1 kind: DaemonSet metadata: # Unique key of the DaemonSet instance name: daemonset-example spec: selector: matchLabels: app: daemonset-example template: metadata: labels: app: daemonset-example spec: containers: # This container is run once on each Node in the cluster - name: daemonset-example image: ubuntu:trusty. Each rollback updates the revision of the Deployment. Rollback to an earlier Deployment revision if the current state of the Deployment is not stable. A Daemonset assures that some or all Nodes run a copy of a Pod. You can define Deployments to create new ReplicaSets, or to remove existing Deployments and adopt all their resources with new. kubectl delete -f nginx-rs. kubectl apply -f postgresql. Instead you create Deployments and StatefulSets where a controller takes care of that. ReplicasSet will ensure that the number of pods (defined in our config file) is always running in our cluster. - state_node - state_deployment - state_replicaset - state_pod - state_container period. The solution(s) : Use a StatefulSet, ReplicaSet or DaemonSet to ensure the Pod creation after a Node failure. Labels are key/value pairs that are attached to objects such as Pods. If a Pod from the ReplicaSet fails, it automatically creates an additional Pod from the. 5. 1. In this example: A Deployment named nginx-deployment is created, indicated by the . Steps to Reproduce (for bugs)Replicaset will only ensure that the replicas number of pods will be created on other nodes during the process. DaemonSets. A DaemonSet is an efficient way to deploy containers on multiple servers inside a Kubernetes cluster. A ReplicaSet (RS) is a Kubernetes object that ensures there is always a stable set of running pods for a specific workload. kubectl get replicaset. The Daemonset controller added a backoff for recreating pods evicted by nodes. StatefulSet is the workload API object used to manage stateful applications. For example, if you have a logging agent that you want to run on every node in your cluster, you could use a. Container Insights uses a containerized version of the CloudWatch agent that runs in a Kubernetes DaemonSet to discover all running containers in a cluster and provide node-level metrics. Deployment. On the other hand, deployment is detailed as "Package deployment contains all the logic for handling Kubernetes Deployments". This is useful in multi-tenant environments where you must isolate tenants from each other or when you want to create separate environments for development, staging, and production. Plus I think it’s more common to use “kubectl run” when imperatively creating a Pod. I like to call it as “run everywhere thing” when I introduce it to newbies. DaemonSets guarantee a single instance of a pod runs on each eligible node. Node Exporter is deployed using a special kind of ReplicaSet called a DaemonSet. ReplicaSet vs. But what is the best for this case ? This Pod is stateful (I am using volume hostPath to keep the data) and is deployed using nodeSelector to keep. This allows your automation to know what state the database is in and then run each appropriate script from there in order to upgrade it to the most current version. DaemonSets are a key component of the Kubernetes cluster and allow administrators to configure services (pods) across all or a subset of Kubernetes nodes with ease. // +optional CollisionCount *int32 `json:. A DaemonSet in Kubernetes is like a chef in a restaurant. So for DaemonSet to run on all nodes, you would have to add the following tolerations on DaemonSet which means that it should tolerate all nodes. Close navigation. DaemonSets. Both Application Load Balancer and Network Load Balancer are designed from the ground…The Azure Monitor metrics agent's architecture utilizes a ReplicaSet and a DaemonSet. With RollingUpdate update strategy, after you update a DaemonSet template, old DaemonSet pods will be killed, and new DaemonSet pods will be created automatically, in a controlled fashion. ReplicaSetは指定された数のPodを複製し、実行してくれる。. com A ReplicaSet is defined with fields, including a selector that specifies how to identify Pods it can acquire, a number of replicas indicating how many Pods it should be maintaining, and a pod template specifying the data of new Pods it should create to meet the number of replicas criteria. In a StatefulSet, each pod is given a name and treated individually, in contrast to a Kubernetes Deployment, where pods are easily replaceable. Create pods.