The preceding commands delete the ReplicaSet and all the pods that it manages. Werkzeuge installieren. The subtle change in terminology better matches the stateless operating model of Kubernetes Pods. How to reproduce it. The easiest way to scale an existing ReplicaSets on a Kubernetes cluster is to use the Kubectl command-line and quickly scale up or down the number of pods. ObservedGeneration reflects the generation of the most recently observed ReplicaSet. is an optional field that specifies the number of old ReplicaSets to retain to allow rollback. 3. The retention of old replica sets is configurable if you don't want to keep as much history for rollback. 1. 03-02-2020 12:58 PM. Replica Set. GoogleCloudPlatform / continuous-deployment-on-kubernetes Public. They act as a successor to Replication Controllers and provide more advanced features for. A Kubernetes Deployment provides means for managing a set of pods. kubectl delete rc hello-rc --cascade=false. Their purpose is to keep a set of identical pods running and upgrade them in a controlled way. PMM should be platform-agnostic, but it requires escalated privileges inside a container. The updateStrategy field accepts one of the following value. Try switching to an image that is intended to have a long running/always running process, e. Overall, both the rollout restart and delete commands can be used to restart pods in Kubernetes, but they work in different ways and have different effects on the system. They manage the deployment of Replica Sets (also a newer concept, but pretty much equivalent to Replication Controllers), and allow for easy updating of a Replica Set as well as the ability to roll back to a previous deployment. If you try to scale the replica set, then it will (for a very short time) have a new count of 5. spec. When we do deployment, replicaSet adds pod-template-hash label to pods. Find out how to use this handy feature. A ReplicaSet (RS) is a Kubernetes object used to maintain a stable set of replicated pods running within a cluster at any given time. Kubernetes supports rolling updates, which provide a mechanism for updating our application deployment gradually. 12. The rollout restart command is used to restart an entire deployment or replica set, while the delete command is used to delete individual pods. The command to achieve this will be: “kubectl label node node01 diskCapacity=high”. In the beginning, with Kubernetes 1. A ReplicaSet is one of the Kubernetes controllers that makes sure we have a specified number of pod replicas running. Changing revisionHistoryLimit is not enough to unstick the deployment. Setting up a local MongoDB replica set with a single node If you want to use some MongoDB features you need a DB running as a replica set. Here are the reasons. Kubectl. spec. During a Rolling Update operation, which is the strategy you requested, it will create a new Pod, bringing the total to 2. spec. . Notice the little "rev1", "rev2" labels. I want to delete all old replica set once new version successfully deployed. Now we want to move these services into a kubernetes cluster, and have 5 replicas running each with their own settings but thats where I get stuck. 19. A replica set is a lower-level abstraction that provides basic. To scale down the pods under we can use same scale command but here we have to reduce the number of replicas. The proper way to restart all the pod under a replica set is kubectl rollout restart <type-of-replica-set>/<name>. TL;DR: You need to scale your deployment instead of the replica set directly. 3. Create a YAML file using a text editor. As long as the old and new . $ kubectl config set-context NAME [--cluster = cluster_nickname] [-- user = user_nickname] [--namespace = namespace] $ kubectl config set-context prod –user = vipin-mishra kubectl config set-credentials − Sets a user entry in kubeconfig. yaml After some time, we modify d. 9 versi API apps/v1 pada kind ReplicaSet adalah versi saat ini dan diaktifkan secara default. En la versión 1. 1 Answer. (Remember, a controller in Kubernetes is what takes care of tasks to make sure the desired state of the cluster matches the observed state. 23 introduced a new, alpha-level policy for StatefulSets that controls the lifetime of PersistentVolumeClaims (PVCs) generated from the StatefulSet spec template for cases when they should be deleted automatically when the StatefulSet is deleted or pods in the StatefulSet are scaled down. selector. Open Shift introduced Deployment Configurations at a time that Kubernets provided only Replication Controllers. 9, la version de l'API apps/v1 pour le type ReplicaSet est la version actuelle et activée par défaut. ReplicaSets instantly produces a new pod if one of the existing pods is deleted or crashes. yml file called ‘frontend. To temporarily suspend every client currently connected to the Redis server, you can use the client pause command. If a pod crashes, it will be recreated to get back to the desired state. As such, it is often used to guarantee the availability of a specified number of identical Pods. . Stale issues rot after an additional 30d of inactivity and eventually close. deployment-name-946622287 0 0 0 5d. Creating a Kubernetes Objects / Resources. In the replica sets, we used the selector. e filtering according to set of values. There is no recreating / moving to the other node, it's just removed (for bare pods). Everytime, I am trying to delete/scale down the old replicaset byThis task shows you how to delete a StatefulSet. 7 Answers. The replica sets can be multiple up to a limit of 10 based on the number of updates that have been done using deployment. 6. Once it is submitted, the Kubernetes cluster will create the pods and ReplicaSet. 8. 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. @kargakis I'm 95% sure the deployment had revisionHistoryLimit set from the first version on (I checked the Git history, and it's there for the first commit, but I can't be sure a version without the field was pushed to Kubernetes before the file was committed). ~ k create d. kubectl rollout restart sts <name> to restart the pods, one at a time. Every time you change the tag and run. Scale your replica count, initiate a rollout, or manually delete Pods from a ReplicaSet to terminate old containers and start fresh new instances. Don't let them control you and keep you down. But I am facing strange issue. 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. A ReplicaSet's purpose is to maintain a stable set of replica Pods running at any given time. apps "webapp" deleted You can delete a ReplicaSet without affecting any of its Pods using kubectl delete with the — cascade. Unfortunately the Kubernetes ReplicaSet doesn't allow you to do what you ask; this will always try to bring the replicas of your Pod to the desired state (with a timing that increases incrementally from time to time). An arbitrary time range can be set via start and end query args. 3, but I will try. Deployment allows us to easily keep a group of identical pods running with a common configuration. Technically, you can delete the old replicaset by running kubectl delete replicaset R_old and this would terminate the old pod. {target} is the name of the pod you want to view logs from;there is no any yml file, to update ‘new-replica-set’. 2. Use a SOCKS5 Proxy to Access the Kubernetes API; Set up Konnectivity service; TLS. Hi, I wanted to report issue that after "deployment update" (I change image name with "kubectl set image deployment/. . $ kubectl delete. The MongoDB replica set can be easily connected with the help of internal ClusterIP within the cluster. . When i type: kubectl get all Only the pod and the service is visible, both of which will return upon deleting them. This can be done by adding the new replica set as a secondary node to the current replica set, and then promoting it to the primary node. The pods are created by the Deployment I've created (using replica set), and the strategy was set to type: RollingUpdate. Kubernetes deployments manage stateless services running on your cluster (as opposed to for example StatefulSets which manage stateful services). Here, I’m scaling down the ReplicaSet used in the article’s example to manage two pods instead of four. Once you are confident all nodes are not running and the local database are gone, start the mongod process again (of course using the --replSet flag). Only when I cleaned up all replica sets with kubectl delete $(kubectl -o name get rs), new replica set was created, and then everything worked again. The Deployment creates a ReplicaSet that creates three replicated Pods, indicated by the . StatefulSets (since Kubernetes 1. It can be considered as a replacement of replication controller. If you want to delete the RS but not pods. edit the image name in the editor. Kubernetes Deployments do not manage the pods directly, it delegates the job to the replica set Deployments create a new replica set whenever you do an update to the deployment Even though the new. I'm very new to Kubernetes and using k8s v1. Now I would like to restore this data to my remote mongodb, which is a replicaset with two replicas running on a kubernetes cluster. if this issue still reproduces, please supply the deployment yaml, and the exact commands you are issuing by order, and i'll try to. Kubectl autocomplete BASH source <(kubectl completion bash) # set up autocomplete in bash into the current shell, bash-completion package should be installed. Summary of what we learned: ReplicationControllers always keep the desired number of pod replicas running. The deployment will indicate the current "revision" of the replica set with the deployment. Replica Sets are a level above pods that ensures a certain number of pods are always running. 7) uses an update strategy to configure and disable automated rolling updates for containers, labels, resource request/limits, and annotations for its pods. We can control and configure the number of replicas with the replicas field in the resource definition. $ kubectl config set. deployment-name. To delete. ReplicaSet then fulfills its purpose by creating and deleting Pods as needed to reach the desired number. To unblock a client connection that has been previously blocked, whether from a wait, brpop, or xread command, you can run a client unblock command with the following syntax: client unblock client_id. Rollout a ReplicaSet: A Kubernetes deployment generates a replica set a pod that contains information regarding the number of pos to be generated in the background. spec. selector are the same,. First time Kubernetes user here. It is a nuisance, because the new "old" pod can start things that we don't expect to be started before the. Replica Set. By default, VictoriaMetrics returns time series seen during the last day starting at 00:00 UTC. Test how scalability is going to seamless & quick. The below command shows how I scale the number of pods from 3 to 4. The number of ready replicas for this replica set. )3 Answers. It manages the lifecycle of pods and provides a way to scale and maintain the desired state of the application. conf: uncomment the replication section and add replSetName (e. The file provides the necessary configuration for the job. A Kubernetes deployment defines the desired state of the application, including the number of replicas, the container images, and the configuration of each replica. Share. Changes affected deployment and service names, the result was: new deployment with new name created. For single resources (e. There are two types of cascading deletion , as. The Pod can run background processes that provide services, such as logging, monitoring, networking, or usuage on every node in a. If one pod dies or crashes, the replica set configuration will ensure a new one is created in its place. can you reproduce this issue? i mean, delete whatever replicasets you have remaining, and then verify you don't have any pod running. yml). Once Kubernetes has decided to terminate your pod, a series of events takes place. You can set . 9 de Kubernetes, la versión apps/v1 de la API en un tipo ReplicaSet es la versión actual y está habilitada. The deployment pod remains for an indefinite amount of time. kubectl delete rs rs-name. Unlike a. Kubernetes will launch a new pod matching the new replica set. As I described, the old ReplicaSet is not deleted as expected, neither do I see a rolling update. kubectl -n <namespace> delete rs $(kubectl -n <namespace> get rs | awk '{if ($2 + $3 + $4 == 0) print $1}' | grep -v 'NAME') # example output. To more about Kubectl commands refer to the Kubernetes – Kubectl Commands. Eventually, the new Replica Set will be scaled to . 2. because what you are doing is not deleting the deployment but setting the desired replica count to 0. The Deployment creates a ReplicaSet that creates three replicated Pods, indicated by the . This can be done by stopping the MongoDB processes on the nodes, and then deleting the Kubernetes resources associated with the old replica set. Connect to mongodb replicaset in kubernetes with external access enabled. A ReplicaSet's purpose is to maintain a stable set of replica Pods running at any given time. For ReplicaSets, the kind is always just ReplicaSet. For ReplicaSets, the kind is always just ReplicaSet. Method 1: To delete everything from the current namespace (which is normally the default namespace) using kubectl delete: kubectl delete all --all. Now let’s talk about StatefulSets. When we fire delete to remove the resource, it. A Kubernetes pod is a cluster deployment unit that typically contains one or more containers. You could also patch a deployment object directly with a kubectl command, which should trigger Kubernetes to remove the old objects, for example: kubectl -n namespace patch deploy sas-notifications --type json -p=' [ {"op":"replace. Red Hat Openshift Container Platform 4The run command creates a deployment which controls the replicaset please run the following commands to verify and solve: kubectl get deployments kubectl delete deployment hello. If you change the replica count, there will be a period of time where more or fewer Pods are running than your manifest indicates. It failed, with the pod showing Warning -Back-off restarting failed container. let's begin! Kubernetes Kubernetes, also known as K8s, is an open-source system for automating deployment, scaling, and management of containerized applications. I even connect it to my mongo-express client. eparis opened this issue on Mar 6, 2016 · 5 comments · Fixed by #22847. kubectl apply -f <name> to recreate the StatefulSet. Edit the controllers configuration by using kubectl edit rs ReplicaSet_name and change the replicas count up or down as you desire. This article shows how to configure it locally. If a pod crashes, it will be recreated to get back to the desired state. Pods in a replica set are controlled by the Replica Set Definition of the replica set, e. How to auto remove the old replica set (Desired 0) after deploy? Ive noticed that after a deploy, the old replica set is still present. Containerized applications with Kubernetes on EKS. Then delete the "local" database for every node. These could be one or more running containers or a group of duplicate pods, known as ReplicaSets. With replication, you are making a copy of a complete pizza pie on every server. Use this procedure to create a new replica set in a member Kubernetes cluster in a multi-Kubernetes-cluster deployment. Use kubectl directly. Deleting the replicaSet without deleting the pods: Below is a Yaml file of a replicaSet called "replica_1": We can create the replicaSet using the below command: We check the details of our replicaSet using the below command: The replicaSet "has" three pods replicas of a "debian" image. 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. Let’s create a replicaset to understand this. replicas and all old Replica Sets will be scaled to 0. The ReplicaSet is also responsible for creating and managing pods based on a template specification. Usually, you define a Deployment and let that Deployment manage ReplicaSets automatically. ) Without RS, we will have to create multiple manifests for the number of pods we need. kubectl scale rs/new-replica-set -. Prerequisites. Following Deployment manifest is used to deploy. Kubernetes will automatically create a new pod to replace the one you just deleted. remove("mongo-2. name field. . If for some reasons one pod is. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. selector are the same,. Once all finalizers have been removed, the object itself is removed from. @nikhiljindal ubernetes-lite runs the latest code. For ReplicaSets, the kind is always a ReplicaSet. This is a quick tutorial is meant to explore some common objects in kubernetes. Connect to the replica set's current primary. To disable sharding, set the sharding. 1 Answer. 2, a new abstraction was introduced: Deployments. This will delete your deployment, associated replicasets and pods of this deployment. How to auto remove the old replica set (Desired 0) after deploy? The text was updated successfully, but these errors were encountered: 2. please check if that pod has a Deployment controller (which should be recreating the pod), use: kubectl get deployments. Share. I deployed a service using kubectl -n my_namespace apply -f new_service. To get all the resources. When I apply the yaml (kubecl apply), it creates the below resources: 1 Deployment 1 ReplicaSet 2 Pods. Specify the priority of the replica set member during elections. However, I have tried to delete the service, pod, deployment, and replicaset. 96. Since you have this deployed using Kubernetes you can do the following: delete the PVC claimed by mongo-rs-1. kubectl edit rs replicaset. Writing a ReplicaSet manifest. What happens when a bare pod (not managed by Replica Sets or similar) is evicted? Is it moved to another node or it is just removed? Pod is designed as a relatively ephemeral, disposable entity; when it is evicted, it's deleted by a Kubelet agent running on the node. 15. deployment-name-949954325 0 0 0 40d. Deleting our replicaSet: To delete our replicaSet "replica_1" without deleting the pods attached to it, we use the below command: Remark: The --cascade option set to "orphan" tells the command to only. 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. V1ControllerRevision create_namespaced_controller_revision(namespace, body, pretty=pretty, dry_run=dry_run, field. You can specify how many Pods should run concurrently by setting . You should be able to get the name of the replica-set from that object and then, later on, use it in order to delete it. Also, I would suggest to check resources allocation on GKE and its usage on your nodes with next command: kubectl. Yes. Each certificate should include a valid Domain Name. Notice two replica sets, one is without any pods: ovk added the. Kubernetes monitoring with the Kubernetes metrics server. marsblkm mentioned this issue on Jul 25, 2021. yaml. You've probably created a deployment that's recreating the replica set for you. For this reason, replica sets are preferred over a. The only operation that can be applied to the object by Kubernetes, is removing finalizers and updating its status. 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. Here the replicas field is set to 3, but you can set it to whatever fits your application. replicas==0)]. Deleting a StatefulSet You can delete a StatefulSet in the same way you delete other resources in Kubernetes: use the kubectl delete command, and specify the StatefulSet either by file or by name. You can use the kubectl get pods command to list all the pods in the cluster and find the one you need. Notice two replica sets, one is without any pods: ovk added the. It is up to the user to delete old jobs after noting their status. When you delete a DaemonSet, you will delete all of the pods that it has produced. but the problem is i need to clean all old deployment and replica set once new version deployed successfully. eRase is a private and anonymous online reporting tool for. selector are the same,. Ask the Expert: Introduction to Making VMware Perform with SAS 14-Nov-2023. 492suser. mongo-old") rs. Use the following command to delete the Kibana object: $ kubectl delete Kibana quickstart-kb. /close. spec. I have tried to set the revisionHistoryLimit to 1 but it also does. What you expected to happen: Replicaset should be cleared up once the deployment rollout is complete. The next part in the manifest is the selector field. replicaset: a replica set. As long as the old and new . a number of replicas indicating how many Pods it should be. . 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. However, terminating a pod doesn't necessarily mean it is been killed immediately. Prepare each replica set in the standalone mode (hostnames, sharding configuration, users) Start the cluster on K8s and initialize each replica set. 28. As with all other Kubernetes API objects, a ReplicaSet needs the apiVersion, kind, and metadata fields. replicas. To manually delete a ReplicaSet, run the following command: kubectl delete rs <ReplicaSet_NAME> --cascade=false Next steps. To create the pods, ReplicaSet uses the pod template. Create a folder called /kubernetes_experiments and in that folder run. The following is an example ReplicaSet definition: apiVersion: apps/v1 kind:. Deleting a ReplicaSet In order to remove the ReplicaSet from the Kubernetes system, you can rely on the subcommand delete. This means that you can not delete the pod to unstick the rollout, as the kubelet is responsible for deleting the associated pod. Before proceeding, make yourself familiar with the considerations enumerated below. StatefulSets are designed to run stateful applications in Kubernetes with dedicated persistent storage. I deleted the resources in the below order and it worked for me. For instance, pods may fail and be subsequently evicted when there is a sudden drop in system resources and an increase in node pressure. ReplicaSet, error) GetAllReplicaSetsInChunks is the same as GetAllReplicaSets, but accepts a chunk size argument. The configuration of each Deployment revision is stored in its Replica Sets; therefore, once an old Replica Set is deleted, you lose the ability to rollback to that revision of Deployment. 9 de Kubernetes, la versión apps/v1 de la API en un tipo ReplicaSet es la versión actual y está habilitada. 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. $ oc adm prune deployments --keep-complete=5 --namespace=myproject --confirm. However, this is how the Deployment object actually does rolling upgrade. Use a SOCKS5 Proxy to Access the Kubernetes API; Set up Konnectivity service; TLS. Mount storage volumes to a separate VM. 9 the API version apps/v1 on the ReplicaSet kind is the current version and is enabled by default. 9 the API version apps/v1 on the ReplicaSet kind is the current version and is enabled by default. Use a SOCKS5 Proxy to Access the Kubernetes API; Set up Konnectivity service; TLS. Writing a ReplicaSet manifest. It can be configured with min and max number of replicas. Kubernetes ReplicaSets have replaced the older Kubernetes ReplicationControllers. In order to remove the ReplicaSet from the Kubernetes system, you can rely on the subcommand delete. As long as the old and new . In Kubernetes, a ReplicaSet is responsible for maintaining the desired number of replicas of a pod to ensure high availability and load balancing in handling traffic. > Now for our pod to run on this node we need to specify a. Pods (and, by extension, containers) are, nevertheless, short-lived entities. It also helps us roll back to a previous version by creating a replica set and updating it with the new configuration. When i type: kubectl delete pods <pod-name> --grace-period=0 --force. 0 and Spotify maven Docker plugin. mycompany-mongodb-headless:27017/dbDeleting a DaemonSet is a simple task. matchLabels field and. This name will become the basis for the ReplicaSets and Pods which are created later. Notifications Fork 885; Star 1. deployment-name-920127227 0 0 0 33d. deployment , pods, replica-set for particular deployment excluding specific one in kubernetes. Kubernetes provides a first-class,. Re: How to remove old replica sets from Viya deployment. Kubernetes > Pods from the top menu bar. Even though the new replica set is created. Scaling a number of replicas in Kubernetes. master $ kubectl scale rs frontend --replicas 2 replicaset. Because the deployment controller is the sole source of truth for the sizes of new and old replica sets owned by a Deployment object, it is able to scale ongoing rollouts. It makes sure that a stable set of replica pods is running at any given time, which guarantees an available specified number of identical pods. By using selector. if this issue still reproduces, please supply the deployment yaml, and the exact commands you are issuing by order, and i'll try to. all refers to all resource types such as pods, deployments, services, etc. Run the command. 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. OpenShift and Kubernetes users are not supposed to manage Replication Controllers nor Replica Sets directly; they are supposed to manager either Deployment Configuations or Deployments. The absolute number is calculated from percentage by rounding up. 1 Answer. The key to figuring out how to kill the pod will be to understand how it was created. Normal Kubernetes Service routing (via kube-proxy) is used to split traffic between the ReplicaSets. matchLabels: This specifies the labels used for pod selection. 3. Replica Set is the next generation of Replication Controller. Once the original is deleted, you can create a new ReplicaSet to replace it. ; deployment: a deployment is what is responsible to keep a set of pods running. can you reproduce this issue? i mean, delete whatever replicasets you have remaining, and then verify you don't have any pod running. Cleans up empty directory (not used anymore) in etcd as a CronJob (etcd-empty-dir. When I apply a simple deployment and then delete it, the replicaset and their associated pods are not being removed (while deployment, services, etc. . 4, Minikube v0. You would normally use a Deployment to manage this in place of a Replica Set. As long as the old and new . Kubernetes will automatically create a new pod to replace the one you just deleted. Saved searches Use saved searches to filter your results more quickly Clean up "Replica Sets" when updating deployments? 2 Kubectl apply for a deployment with revHistoryLimit 0 does not delete the old replica set 14. create_namespaced_controller_revision . Identical Pods are known as Replicas. 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 foregroundDeletion finalizer is handled by the garbage collection system, which will delete the replica sets first, before removing the deployment. A DaemonSet is a Kubernetes object that ensures that a copy of a Pod is always available on all (or selected) nodes in the cluster. yaml configuration file and is turned on by default. Why A New Replica Is Not Spun Up?. revisionHistoryLimit to tell the Deployment how many old replicasets. The specified. metadata. selector are the same,. Notin Exists ReplicaSets manages all the pods with labels that match the selector. answered Apr 1, 2016 at 5:16. let's start from the top. Observe the current state of the application: notice two replica sets instead of one. Kubernetes will terminate a pod from the old replica set. The main items to highlight here are the replica and the selector fields. In a Kubernetes cluster: if you delete Pods, but they are recreated again there is a Kubernetes Deployment / StatefulSet / DaemonSet / job that recreates them delete a Deployment / StatefulSet / DaemonSet to delete those pods, check k8s jobs; if you delete a ReplicaSet, but it is recreated again there is a Kubernetes Deployment that. So, this looks enough for a. Declaring a New State of Pods: On updating pod template spec a new replica set is created and deployment moves pods from the old replica set to the new replica set. I have tried to set the revisionHistoryLimit to 1 but it also does not help. 1. A ReplicaSet contains a podTemplate field including selectors to identify and acquire Pod(s). ~ k get all No resources found in deploymentbug namespace. new service with new name created old service was removed old depl. Use either kubectl or the Kubernetes API to delete the Deployment, depending on the Kubernetes version your cluster runs. 2. The configuration of each Deployment revision is stored in its Replica Sets; therefore, once an old Replica Set is deleted, you lose the ability to rollback to that revision of Deployment. Kubernetes - Replica Sets. matchLabels. A ReplicaSet's purpose is to maintain a stable set of replica Pods running at any given time. kubectl get pods,services,deployments,jobs,daemonset.