You will almost never create this directly. replicas field. Let's take a brief look at the various options used with the command: webapp: The name of the Deployment--image=nginx: Specifies the name of the container image--replicas=2: Specifies the number of replicas (Pods) to run--dry-run=client: Used to preview the object instead of creating it--output=yaml: Specifies that the output format is. This manifest defines a Deployment for the nginx application. Bare pod. However if you change labels and. The Pods and ReplicaSets are replaced individually, allowing old and new versions to briefly coexist. This option is mandatory as we aren’t updating the value of the spec. With ReplicaSet you define the number of replicas you want to run for a particular service. kubectl delete deploy inginx-deploy. A replica set, also known as a cluster, provides redundancy and availability. ¶ The Advanced Configuration Options section allows you to set MongoDB runtime options for each MongoDB process in your deployment. m. Below is a simple example of a rolling update and undo operation (rollback) is explained. Objectives Create an nginx deployment. Here we go. The main difference between a Replica Set and a Replication Controller right now is the selector support. I have a command to scale all the deployments to zero. It uses the spec. When you revise a deployment, a ReplicaSet is created that. However, more sophisticated selection rules are possible, as. kubectl create --help |awk '/Available Commands:/,/^$/' Available Commands: clusterrole Create a cluster role clusterrolebinding Create a cluster role binding for a particular cluster role configmap Create a config map. default 22m 22m 1 wordpress-686ccd47b4. The ReplicaSet data includes the number of desired replicas, the selector to identify which pods are being controlled, and the template for the pod. If a pod fails, Kubernetes immediately rolls out a replica of the pod to take its place in the cluster. tier=backend. one may never need to manipulate ReplicaSet objects when using a Deployment)Alternatives to ReplicaSet Deployment (recommended) Deployment is an object which can own ReplicaSets and update them and their Pods via declarative, server-side rolling updates. A ReplicaSet provides basic scaling mechanisms for pods, such as creating new pods if any pod. Here the replicas field is set to 3, but you can set it to whatever fits your application. Imperative way: (this will then diverge from what you have in your yaml-file) kubectl scale deployment mage-di --replicas=2. of pods as mentioned in the yaml file. Example: kubectl delete deployment hello-world -n mynamespace. kubectl get replicaset. A Deployment is a higher-level resource meant for deploying applications and updating them declaratively, instead of doing it through a ReplicationController or a ReplicaSet, which are both considered lower. A Deployment is a higher-level resource meant for deploying applications and updating them declaratively, instead of doing it through a ReplicationController or a ReplicaSet, which are both considered lower-level concepts. Share. To delete all 3 objects (Pod, ReplicaSet and Deployment), please execute the following command. This document provides strategies for replica set deployments and describes common architectures. yaml After some time, we modify d. Whether you’re rolling an update or rollbacking one, using the deployment helps you handle Pod instances better. , creating a Deployment will automatically create a ReplicaSet based on the Deployment’s pod template and desired number of replicas Updating the Deployment’s pod template causes it to temporarily create a new ReplicaSet and “move” Pods from the old ReplicaSet to the new one at a. Create a DaemonSet. Check if there are any finalizers which block delition. StatefulSet is the workload API object used to manage stateful applications. g. is highlighted above. there is a Kubernetes Deployment that recreates it. If you use Deployments to manage your Kubernetes workloads, and most people do, then they will leave behind one ReplicaSet for each change you make. Kubernetes has emerged as the de facto standard for container orchestration. It specifies the application's life cycle, including the pods assigned to the application. View the details of the deployed service. However, more sophisticated selection rules are possible, as. Then, the Deployment controller constantly works and monitors to ensure the actual state is as expected. If there are too few, the. It scales up 7 because 25% of 25 (your maxSurge value) is 6. Update the deployment. Existing package dependencies might be removed if required. Comment un ReplicaSet fonctionne Un ReplicaSet est défini avec des champs, incluant un selecteur qui spécifie comment identifier les Pods qu'il peut posséder, un nombre. 1 that I run. ReplicaSet は Pod を作成して管理するが、 ReplicaSet が Pod を所有しているわけではない. In the case of a Job, update parallelism only if the current parallelism value matches. It increases the pods one by one while the old replicaset decreases the pods one by one. You can monitor the progress for a Deployment by using kubectl rollout status. An example output is as follows. (ReplicaSet extends an older object called ReplicationController-- which is exactly the same but without the Revision history. The kubectl scale command is used to change the number of running replicas inside Kubernetes deployment, replica set, replication controller, and stateful set objects. The Deployment and DeploymentConfig API objects in OpenShift Container Platform provide two similar but different methods for fine-grained management over common user applications. Share. It's mainly used by Deployment as a mechanism to orchestrate pod creation, deletion and updates. As per the name, ReplicaSet is used for managing the replicas of our pods. It manages the deployment and scaling of a set of Pods, and provides guarantee about the ordering and uniqueness of these Pods. selector field defines how the created ReplicaSet finds which Pods to manage. ownerReferences" field with the ID of that ReplicaSet. The pod-template-hash label is added by the Deployment controller to every ReplicaSet that a Deployment creates or adopts. Although ReplicaSet 's main purpose is to maintain a stable set of replica Pods, it's not a kubernetes object that is commonly created, at least not explicitly. selector field defines how the created ReplicaSet finds which Pods to manage. Deployment is recommended for application services. A replica set contains several data bearing nodes and optionally one arbiter node. Kubernetes allows the implementation of HPA both as a controller and an API resource. Deployment and ReplicaSet (replacing the legacy resource ReplicationController). yaml --record=true #get the replicaset list kubectl get rs #get the Pods list. Select the MongoDB version for your replica set. spec. spec. Kubernetes HorizontalPodAutoscaler automatically scales Kubernetes Pods under ReplicationController, Deployment, or ReplicaSet controllers basing on its CPU, memory, or other metrics. kubectl scale command is used to change the number of running replicas inside Kubernetes deployment, , replication controller, and stateful set objects. The situation is analogous to having a manager order "We need three workers doing this task at all times. Horizontal scaling means that the response to increased load is to deploy more Pods. We’ve to use the –replicas option with this command to specify the new size. Add an arbiter to give a replica set an odd number of voting members to prevent election ties. So, Replicaset ensure replicas of pods are available whereas deployment are reponsible for managing different versions of the application. StatefulSet と PVC の関係まとめ. replicas property from the YAML file. In the case of a Job, update parallelism only if the current parallelism value matches. By default, every Deployment is set to 10 for reserving the old. Deployment sử dụng ReplicaSet để quản lý các Pod. Deployment – A Deployment is the most common way to get your app on Kubernetes. integer. Create pods. Or just strip the name out to get the index at the end. spec. This last is. revisionHistoryLimit is an optional field that specifies the number of old ReplicaSets to retain to allow rollback. template. Scales down all deployments in a whole namespace: kubectl get deploy -n <namespace> -o name | xargs -I % kubectl scale % --replicas=0 -n <namespace>. Under the hood, Deployment creates a ReplicaSet which in turn creates pods on our cluster. // +optional CollisionCount *int32 `json:"collisionCount,omitempty" protobuf:"varint,8,opt,name=collisionCount"` }It seems a deployment has gotten stuck. It creates a replica of 4 busybox pods. Step 2: Edit the replicas property to the desired number of replicas: apiVersion: apps/v1 kind. We first create a deployment: kubectl apply -f d. In this case, you select a label that is defined in the Pod template (app: nginx). If you want to create Deployment you must specify this properties. Or by using YAML: apiVersion: v1. Create a Service. You can define a ReplicaSet using a YAML file. The Deployment is scaling down its older ReplicaSet(s). ReplicaSets are the smart way to. We will create an example ReplicaSet using the below configuration, just like we created a Pod in part 3 of this series. When you revise a deployment, a ReplicaSet is created that. The standard replica set deployment for a production system is a three-member replica set. This field appears if your deployment MongoDB version is 3. Both are related to the limited control that deployments provide over how an application runs: Lack of granular control. You'll start by creating a ReplicaSet manifest in YAML format. A ReplicaSet is a Kubernetes object that ensures that a specified number of replicas of a pod are running at any given time. the pod template specified inside the Deployment's yaml file, and the value of the replica field (which define the size of the pod set). While ReplicaSets can be used independently, today they’re mainly used by Deployments as a mechanism to orchestrate Pod creation, deletion and updates. ( i. Rolling Deployment. Hot Network QuestionsBased on the configuration you deployed with, both the deployment. The . List the nodes on your cluster: kubectl get nodes. Now we have created a deployment and need to verify if the Nginx web servers were deployed correctly. Un ReplicaSet (ensemble de réplicas en français) a pour but de maintenir un ensemble stable de Pods à un moment donné. Viewed 449 times. If you see the logs, they are starting from 73, meaning that the previous pod had written till 72 in the file and. After you destroy the ReplicaSet, the running Pods will also get deleted. kubectl delete <component type> <name> <-n namespace>. 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 it always on the same Node. Deployment creates ReplicaSet with the number of replicas=3. While ReplicaSets can be used independently, today they're mainly used by Deployments as a mechanism to orchestrate Pod creation, deletion and updates. So, if you want to change anything in the pod Spec, you should make that change in the deployment, not in the replicaset or the pod directly as they will get overwritten. kubectl get pods. Here’s a basic tutorial on how to scale an application using the vim terminal editor and adjusting the replicas property in a ReplicaSet configuration file: Step 1: Open the ReplicaSet configuration file in the vim terminal editor: $ vim my-rs. A ReplicaSet is a process that runs multiple instances of a Pod and keeps the specified number of Pods constant. Pod と ReplicaSet の関係は疎結合になっている。. In summary, Controller reads the Deployment spec, forwards the pod configuration to ReplicaSet and then it. A Deployment is a Kubernetes object that manages a set of identical pods, ensuring that a. This will likely be a ReplicaSet (which is generated by the Deployment). Create a file called. When you increase the replica count, to scale up your service. See SRV Connection Format to learn the SRV. g. This way the deployment will be marked as paused and won't be reconciled by the controller. Always use a replica set in production. This means you can start with a Pod, and after a while you can add it to a Replicaset if you want to. Understanding Deployment s. Create a secret that contains credentials for accessing a private image repository. The Deployment can then manage the cleanup of older unused ReplicaSet s. Instead we use Deployment to manage a ReplicaSet. kubectl apply -f dp. Avoid complexity when possible, but let your application requirements dictate the architecture. tier=backend. If a user-facing Pod fails or becomes overworked, the Deployment allocates work to a Pod from the ReplicaSet to maintain responsiveness. Deploy ReplicaSet. While ReplicaSets can be used independently, today they're mainly used by Deployments as a mechanism to orchestrate Pod creation, deletion and updates. Version. Alternatives to ReplicaSet Deployment (recommended) Deployment is an object which can own ReplicaSets and update them and their Pods via declarative, server-side rolling updates. Enter the replica set name and click the Convert button. We often don’t need to create a ReplicaSet directly. Kuberneters – Difference Between Replicaset and Replication Controller. Without it, ReplicaSet might create new pods when existing pods are deleted. For example, if you look at the above Deployment closely, you will see that it first creates a new Pod, then deletes an old Pod, and creates. The --port command-line option. On the deployment configuration editor page or in the fromimage page of the web console, set the Pull Secret. extensions. spec. apps/kuard created $ kubectl get deployment,replicaset,pod --show-labels NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE LABELS deployment. A ReplicaSet (RS) is a Kubernetes object used to maintain a stable set of replicated pods running within a cluster at any given time. 2 Answers. spec. To get the name just read the environment variable HOSTNAME. Using electromagnetic waves to flummox and follow smarter weapons has become a critical part of the cat-and-mouse game between Ukraine and Russia. There are many private registries in use. spec. Since the Kubernetes v1. replicas field. Pod に障害が発生し、オートヒーリングを実施した際にも、同一のPVを引き続き mount. What you expected to happen: I would expect to see the same results for both. ReplicaSet – A ReplicaSet creates a stable set of pods, all running the same workload. The relation between Deployment, Replicaset & POD. The Deployment creates a ReplicaSet that creates three replicated Pods, indicated by the . To add an option: Click Add Advanced Options. The configuration of each Deployment revision is stored in its ReplicaSets; therefore, once an old ReplicaSet is deleted, you lose the ability to rollback to that revision of Deployment. If a node is added/removed from a cluster, DaemonSet automatically adds/deletes the pod. Kubernetes Documentation. By default, it ensures that at most 125% of the desired number of Pods are up (25% max surge). Create a new OpenShift Container Platform project. The nodeapp-deployment is the deployment name which is already. In general, Deployment is a more powerful and feature-rich resource than ReplicaSet. Improve this answer. Or by using YAML: apiVersion: v1. Deployment is a higher-level concept that manages ReplicaSets and provides declarative updates to Pods. This hostname can be a hostname, an FQDN, an IPv4 address, or an IPv6 address. Khi triển khai một ứng dụng mới thông qua Deployment, nó sẽ tạo ra một ReplicaSet mới để quản lý các Pod mới được tạo ra. However we also want to delete the replicasets and pods that below to 'our-deployment-name'. I want to change the number of replications (pods) for a Deployment using the Kubernetes API (v1beta1). Use kubectl to label the node with a key-value pair. Finally, I using helm to upgrade release, as expected, helm will override the deployment to 1 pod like first step but in for now, the deployment will keep the values replicas: 2 even you set the values (in values. You can easily verify this using kubectl to retrieve pods and replica sets after. Deployments and deployment configs are enabled by the use of native Kubernetes API objects ReplicaSet and ReplicationController, respectively, as their building blocks. Kubernetes Documentation. Let’s now do a scale out test, where we will scale the deployment to 3. For Deployment, ReplicaSet, Replication Controller, only scale, if the number of existing replicas matches. That’s the job of the ReplicaSet object. Il a ensuite poursuivi la montée en puissance du. When your Pod's part of a ReplicaSet or Deployment, you can initiate a replacement by simply deleting it. Deployment is a higher-level API object that updates its underlying Replica Sets and their Pods in a similar fashion as kubectl rolling-update. As per the name, ReplicaSet is used for managing the replicas of our pods. 1. By default, Kubernetes keep 10 replica sets for each deployment, which means you can go back 9 versions prior. I want a Replica. As per the name, ReplicaSet is used for managing the replicas of our pods. For example, if you want to have four pods running at all times and one of them suddenly crashes, a ReplicaSet will ensure that the crashed one is removed and will spin up a new, hopefully healthy, one. ReplicaSetは指定された数のPodを複製し、実行してくれる。. You cannot create replicaset using the command line. The ReplicaSet creates Pods in the background. selector section so that new replicaset and deployment can be run while old one still taking traffic. Creating a ReplicaSet. When an HPA is enabled, it is recommended that the value of spec. offer several benefits for managing application deployments:Good explanation what is event in Kubernetes you can find in Types of Kubernetes Events article. This Deployment specifies that it wants to maintain 3 replicas of a Pod running the Nginx container. This means that a. All fine till here. In the MongoDB spec section, the type of deployment was defined as ReplicaSet with the desired number of replicas of 3. You can scale down to 3 by running the command below. You can create a replica set configuration object in mongosh environment, as in the following example: rsconf = {. ObservedGeneration reflects the generation of the most recently observed ReplicaSet. yaml replicaset "soaktestrs" created Check the Status of a ReplicaSet Once the ReplicaSet is created, we can use the describe command to check the status of the pods and get more detail. I'll post my answer with the full code example later if no one else replies to my question. Deployment resources enable declarative updates of Pods and ReplicaSets. 18 the kubectl run will no longer create deployments but pods. It ensures zero downtime by incrementally updating pod instances with new ones. 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. A pod is the smallest unit of deployment in Kubernetes, consisting of one or more containers that share resources and networks. このリソースは直接使用することは少ないが、次に出てくるDeploymentを抑える上で理解が進むのでやっていこう。. ReplicaSet's purpose is to maintain a stable set of replica Pods running at any given time and it checks how many pods need to maintain bases on which it creates. You cannot create any Deployment (RelicaSet) without container properties description (images, volumes etc. Cuando actualizaste el Deployment, creó un nuevo ReplicaSet (nginx-deployment-1564180365) y lo escaló a 1 y entonces escaló el viejo ReplicaSet a 2, de forma que al menos hubiera 2 Pods disponibles y como mucho 4 Pods en total en todo momento. 2 Answers. kubectl -n eks-sample-app describe service eks-sample-linux-service. This old ReplicaSet tries to spin up a pod and it stays in pending because of the resource limitations on the node. Provide a URL for accessing the API. However, Deployment is a higher-level concept that manages ReplicaSets and provides declarative updates to Pods along with a lot of other useful features. selector to know what Pods it should manage. The running instances are located in multiple locations. How can I diagnose this further?. In docs about owners and dependents it says:. Say we have d. The smallest unit of deployment, a Pod, runs containers. This is where you specify how the ReplicaSet should. » Prerequisites. Whenever we create a new deployment, K8s triggers a Rollout. 2. A replica set is a core Kubernetes object called ReplicaSet. 4 or later. これまで、Pod、ReplicaSetの動作を確認してきましたので、今回はDeploymentの動作を確認します。 Deploymentは、ReplicaSet、Podの上位概念で、以下のような関係になります。 Deploymentの作成 yamlファイルの作成とapply. Despite both controllers being instrumental in managing high-availability. It can automate the. Since the required number of pods is maintained and monitored, they're running and available after the deployment is created. This means that a Deployment can have as many active ReplicaSets as possible, and eventually the deployment controller will scale down all old ReplicaSets and scale up the newest one. . create a deployment. This way you could either, name the stateful-set according to the classes, i. You can expand a managed domain to have more than one replica set per Microsoft Entra tenant. This replica will further create a pod with name web-app-<replica-set->-<pod-id>. Create a Deployment to rollout a ReplicaSet. Then gradually it decreases the count of replicas from the previous ReplicaSet and increases the count on the current one until the latter ReplicaSet has all the Pods. 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. じゃあ、ReplicaSetで十分だから「Deployments」は使うことないのかというと、これは新しいバージョンのアプリをデプロイする時に役に立つ。. For example, If you create a deployment with 1 replica, it will check that the desired state of ReplicaSet. While ReplicaSets can be used independently, today they're mainly used by Deployments as a mechanism. However, more sophisticated selection rules are possible, as. Walaupun ReplicaSet dapat digunakan secara independen, seringkali ReplicaSet digunakan oleh Deployments sebagai mekanisme untuk mengorkestrasi pembuatan, penghapusan dan pembaruan Pod. name=backend. Annotations are important for scraping pods for metrics. kubectl get pod NAME READY STATUS RESTARTS AGE myapp-5d5b49b5ff-j4mkg 1/1 Running 0 31s myapp-5d5b49b5ff-j5jh5 1/1 Running 0 44s myapp. Alternativas al ReplicaSet Deployment (recomendado) UnDeployment es un objeto que puede poseer ReplicaSets y actualizar a estos y a sus Pods mediante actualizaciones en línea declarativas en el servidor. StatefulSetsA Replicaset is a structure that enables you to easily create multiple pods, then make sure that that number of pods always exists. The random string is randomly generated and uses the pod-template-hash as a seed. It ensures that the desired number of replicas (PODs with the application running), as mentioned while creating the Replicaset, is always maintained. A standalone mongod instance is useful for testing and development. 2. But while deployment is under control of an HPA, if you apply deployment config with set amount of replicas, it would override current desired amount of replicas and might scale your deployment. Declarative way, edit this line in your Yaml file: replicas: 2. apps/myapp restarted. . To work with Namespace, you need to add --namespace flag to k8s commands. Set any advanced configuration options for your MongoDB replica set. It's mainly used by Deployment as a. 1. Kubernetes is also known as K8s is an open-source container orchestration tool developed by google which is used for automating software deployment, scaling, and management. Hay nuevos Pods disponibles y listos (listo por lo menos MinReadySeconds). For any of the mentioned triggers, the Deployment controller will do a Deployment sync. Usually, you define a Deployment and let that Deployment manage ReplicaSets automatically. Comment un ReplicaSet fonctionne Un ReplicaSet est défini avec des champs, incluant un selecteur qui spécifie comment. Similar to a ReplicationController, a ReplicaSet is a native Kubernetes API object that ensures a specified number of pod replicas are running at any given time. This is how the deployment is usually rolled out. Add a new member to an existing replica set. Alternatives to ReplicaSet Deployment (recommended) Deployment is an object which can own ReplicaSets and update them and their Pods via declarative, server-side rolling updates. The selectorfield under specdefines how this ReplicaSet identifies the pods it needs to manage. you can list all the pods in custom-namespace. List K8 deployment based on replica count using kubectl. Aug 25, 2023 10 min read Statefulset Deployment Kubernetes. Step #1. The following deployment strategies are supported in the built-in Kubernetes deployment object. 下記の図のようにDeploymentはReplicaSetを生成・管理し、ReplicaSetはPodを生成・管理します。 This way the deployment will be marked as paused and won't be reconciled by the controller. Aunque que los ReplicaSets puede usarse independientemente, hoy en día se usan principalmente a través de los Deployments como el mecanismo. When you updated the Deployment, it created a new ReplicaSet (nginx-deployment-1564180365) and scaled it up to 1 and waited for it to come up. A brand new ReplicaSet is made and also the Deployment manages to move the Pods from the previous ReplicaSet to. 4. Và nhiệm vụ của ReplicaSet là luôn đảm bảo số lượng Pod (current) sẽ luôn là 10 (bằng với DESIRED). How does a deployment work? Behind the curtains, when you create a new deployment, K8s creates two different objects: a Pod definition, using as its specification what is available in the “template” field of the Deployment, and a ReplicaSet. This doesn't work as the ReplicaSet is not inactive. The old ReplicaSet is scaled down as the new one is scaled up, ensuring that the. This task handles orchestration of SMI TrafficSplit objects. The deployment sets up a ReplicaSet with three pod replicas, specified in the replicasfield under spec. The Deployment creates a ReplicaSet that creates three replicated Pods, indicated by the . Assume that you have a Deployment that spawns five Pod replicas. At least that is how it is in 1. Kind you can write code to find the Pod manager/controller depending on the type (ReplicaSet, DaemonSet, etc). Can also be specified via K8S_AUTH_HOST environment variable. Ok, let me explain. In the case of a Job, this option is ignored. Let's say if your deployment had 4 replicas. However, it handles updating them in a controlled way. Entonces, continuó escalando el nuevo y el viejo ReplicaSet con la misma. In the case of a Job, this option is ignored. A ReplicaSet’s purpose is to maintain a stable set of replica Pods running at any given time. StatefulSet is the workload API object used to manage stateful applications. Tested the field as below. When you create a ReplicaSet, you are essentially telling Kubernetes that you want a specific pod replicated x amount of times. This naming is consistent, so you can make sure you always have. Click KUBERNETES OBJECT STATUS to see the object status updates. Every pod owned by a ReplicaSet will get the unique "metadata. of pods are matching the specified no. A ReplicaSet is one of the Kubernetes controllers that makes sure we have a specified number of pod replicas running. To verify the number of Pods, run the $ kubectl get pods command. Main difference (besides that one is using ReplicationController and the other using ReplicaSet as you rightly pointed out) is that. – moonkotteA 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 volume. the pod template specified inside the Deployment's yaml file, and the value of the replica field (which defines the size of the pod set). ReplicaSet is the next-generation ReplicationController that supports the new set-based label selector. nodeAffinity field (if specified) is taken into consideration by the DaemonSet controller when evaluating the eligible nodes, but is. While ReplicaSets can be used independently, today they're mainly used by Deployments as a mechanism to orchestrate Pod creation, deletion and updates. A DeploymentConfig (DC) in OpenShift is more or less equivalent to a Kubernetes Deployment, nowadays. For example, where we previously created a single instance of the Pod, we might create a Kubernetes Deployment YAML example to tell Kubernetes to manage a set of replicas of that Pod — literally, a ReplicaSet — to make sure that a certain number of them are always available. Once new Pods are ready, old ReplicaSet can be scaled down further, followed by scaling up the new ReplicaSet, ensuring that the total number of Pods available at all times during the. After the deployment starts, you find a new KUBERNETES OBJECT STATUS tab next to the TASK LOG tab. vi d. A ReplicationController ensures that a specified number of pod replicas are running at any one time. Let's understand the differences between Deployment, ReplicaSet, and Pod. For your convenience, I'm providing the example here as well.