1. 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. For general information about working with config files, see running stateless applications and object management using kubectl. I have deployment and a replica set in Kubernetes that are failing to create a pod. Display information about the ReplicaSet in the current namespace $ kubectl get replicaset. January 9, 2019. Run kubectl rollout status deployment/nginx-deployment to see rollout status of replicas in this deployment. Try running kubectl get deployments and deleting the deployment from the output of that command. [root@controller ~]# kubectl edit rc myapp-rc replicationcontroller/myapp-rc edited. Finally, to clean up, we remove the deployment. 1. yaml 392. 0 as well as the. You can observe how the autoscaler kicks in when load increases, and increments the quote server deployment replica set to a higher value. io/mongo:4. If you try to scale the replica set, then it will (for a very short time) have a new count of 5. yml kubectl get replicaset kubectl get pods. Behind the scenes, kubectl. First, find the StatefulSet you want to scale. yaml. Update the replicas field in replicaset-demo. You will note if you do kubectl get pods, that they are still broken. Daemon Set; Scaling Commands. The above command will create three replicas of the “myapp” container and manage the lifecycle of the pods. yaml pod2. 2. $ kubectl create -f <replicaSet_file_name>. When you. Running the kubectl get pods command shows the rollout of two new pods with the updated version 1. Set an alias for kubectl in Bash. Replica Sets. spec. $ kubectl apply -f statefulset. To create a replica said execute the following command. but answer still same. Let's check one of the pods just to make sure the new image is used 1 kubectl get pods 2 kubectl get pods -o = custom-columns = NAME:. A service is a network abstraction over a pod. Daemon Set; Scaling Commands. $ kubectl get al. When the traffic and load subsides, we can revert to the original configuration of two Pods. All fine till here. The selector is used to identifying the Pods it can acquire. Use kubectl get to list all Deployments, Replica Sets and Pods in your default namespace:kubectl get secret mongodb -o jsonpath= "{. Edit a replica set: kubectl edit replicaset webapp. I have deployed a mongodb replicaset (v6. 2. This is managed by a ReplicaSet. Then, the kubectl get command returns a list of resources belonging to each resource type in the specified namespace. Instead, use the kubectl get rc command to list replication controllers (or alternatively, change your manifest file to create a ReplicaSet instead of a ReplicationController). First find the pvs: kubectl get pv -n {namespace} Then delete the pv in order set status to Terminating. that Kubernetes Operator creates, can later be migrated to a different to avoid storing secrets in Kubernetes. $ kubectl get rsNAME DESIRED CURRENT READY AGEmy-first-replicaset 3 3 3 2m// get in the editor, modify the replica number, then save and leave$ kubectl edit rs my-first-replicaset# Please. Also Verify if there are any issues with pods kubectl get pods -A. If you run kubectl get pods <pod_name> -o yaml where <pod_name> is a pod created by ReplicaSet, you will see owner reference. This demonstrates how StatefulSets let you consistently designate Pods as having a specific role. Let’s deploy the Replica Sets from the manifest file by running a kubectl command and then afterwards we’ll run a command to list our pods. You can verify this with the command: kubectl get replicaset. It will expose the port permanently but without load balancing. It creates a selector that matches to matchLabels. 13. kubectl get pods -l app NAME READY STATUS RESTARTS AGE web-0 1/1 Running 0. When to use - DaemonSet and/or ReplicaSet?. Example-2: Create replica set using match expressions. template are scaled down. A more complex use case is to run several identical replicas of a replicated service, such as web servers. Administration with kubeadm. Imperative way: (this will then diverge from what you have in your yaml-file) kubectl scale deployment mage-di --replicas=2. When we fire delete to remove the resource, it removes the target objects forcefully: $ time kubectl delete rs my-first-replicaset && kubectl get podreplicaset. DaemonSets run only a single pod replica on each node, whereas ReplicaSets scatter them around the whole cluster randomly. $ kubectl get rs NAME DESIRED CURRENT READY AGE nginx-deployment-1564180365 3 3 0 6s nginx-deployment-2035384211 0 0 0 36sTo create the ReplicaSet, you can use the kubectl apply command: kubectl apply -f my-app-replica-set. name=my-service metadata. apps -n <namespace> (or --all-namespaces) – Noam Manos. kubectl apply -f creates Replica Sets using a config file: kubectl apply -f replicaset-definition-file. The Horizontal Pod Autoscaler automatically scales the number of pods in a replication controller, deployment or replica set based on observed CPU utilization (or, with custom metrics support, on some other application. with the -A option it gives you all your hpa from all namespaces if you want to specify a namespace, you can use -n option. Key Differences First get a list of all deployments, this is important, because you need it to scale back up when needed: kubectl get deploy -A --no-headers | grep -v 'kube' > deploy_state_before_scale. Kubernetes will delete any child resources (in this case, the replica sets and pods): kubectl delete deploy sise-deploy. $ kubectl get hpa -w. Certificate. yaml Step 4: Set up Replication Host. 168. To make changes in your current deployment you can use kubectl rollout pause deployment/YOUR_DEPLOYMENT. Implicit maintenance. kubectl apply-f my-manifest. But when I edit this deployment using the command kubectl edit deployment my-dep2, only changing the version of busybox image to 1. kubectl describe deployment awesome-app-deployment. The Deployment controller will automatically create a new pod. Even though the new replica set is created. kubectl delete rc hello-rc --cascade=false this means the pods are no longer managed . The name of a DaemonSet object must be a valid DNS subdomain name. yaml kubectl apply -f <my-replica-set>. 188ssys. ReplicationController is often abbreviated to "rc" in discussion, and as a shortcut in kubectl commands. yaml job. The output is similar to this:Label Selectors is used to identify a set of objects in Kubernetes. Changing revisionHistoryLimit is not enough to unstick the deployment. Autoscaling is also an option with ReplicaSets using kubectl autoscale rs web –max=5. If the app is switched off and there’s a new incoming request, Kubernetes will launch at least a single replica to handle the traffic. 1 Like. replicaset should spin up new pods with new image. kubectl create -f replicaset. ReplicaSet 的名称必须是一个合法的 DNS. 27, this feature is now beta. It specifies that there should be three replicas of the Deployment and that each pod should be labeled with app: nginx. Note: if you run the command too. The fields of the table are described below:I want to change the number of replications (pods) for a Deployment using the Kubernetes API (v1beta1). As an alternative to using this procedure, you can use the Multi-Kubernetes-Cluster Quick Start. kubectl get statefulsets <stateful-set-name> Change the number of replicas of your StatefulSet: kubectl scale statefulsets <stateful-set-name> --replicas=<new-replicas> To show you an example, I've deployed a 2 pod StatefulSet called web:@HunzlaSheikh When you run kubectl delete -f render. kubectl get nodes -o wide MongoDB® nodes port: You will have a different node port for each MongoDB® node. kubectl delete deployment $ {our-deployment-name} And this seems to delete the deployment called our-deployment-name fine. Try kind: Deployment. Describe the ReplicationController:. kubectl apply -f [manifest file] Code language: CSS (css) Let’s check the endpoint just to make sure it looks correct. The pod is the thing that is replicated. moury~ % kubectl scale statefulset web --replicas=3 statefulset. revisionHistoryLimit in the Deployment to the number of old replica sets you want to retain. In simple words, an instance of a Pod is a Replica. Scale replica set named ‘ipsum’ to 3: kubectl scale --replicas=3 rs/ipsum. In Kubernetes 1. Then you deployed a new revision, with 2 replicas. yaml deployment "nginx" created $ kubectl get deploy NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE nginx 2 2 2 2 51s $ kubectl get -o json deploy nginx | jq '. Kubectl Scale use cases. Here, I’m scaling down the ReplicaSet used in the article’s example to manage two pods instead of four. If you set your namespace above using the set-context command then the pods will be created in the specified namespace. To get more information about a specific replica set, run the command: $ kubectl describe replicasets <replicasetname> List ReplicaSets Info Services in Pods. Mounts: <none> Volumes: <none> Conditions: Type Status Reason ---- ----- ----- Progressing True NewReplicaSetAvailable Available False MinimumReplicasUnavailable ReplicaFailure True FailedCreate OldReplicaSets: <none> NewReplicaSet: integrated-repository-webapp-d69879c5f (0/1 replicas created) Events: Type Reason Age From. But Deployments are recommended, since they are declarative, server side, and have additional features, such as rolling back to any previous revision even after the rolling update is done. When we fire delete to remove the resource, it removes the target objects forcefully: $ time kubectl delete rs my-first-replicaset && kubectl get podreplicaset. $ kubectl get pods -n scaling-demo NAME READY STATUS RESTARTS AGE nginx-59c556767c-ncl9k 1/1 Running 0 16m nginx-59c556767c-vn96s 1/1 Running 0 11s nginx-59c556767c-xx5bb 1/1 Running 0 13m redis-78497c75bd. At this point, you should have three pods created in your cluster. . Usually, you define a Deployment and let that Deployment manage ReplicaSets automatically. The kubectl get rs command lists replica sets, whereas the manifest file in your question creates a replication controller. kubectl get --all-namespaces rs -o json|jq -r '. You can view the ReplicaSet by running the following command: $ kubectl get replicaset NAME DESIRED CURRENT READY AGE hello 5 5 5 30s. MySQL settings remain on insecure defaults to. sh get pods NAME READY STATUS RESTARTS AGE my-nginx-2494149703-04xrd 1/1 Running 0 9h my-nginx-2494149703-h3krk 1/1 Running 0 9h my-nginx-2494149703-hnayu 1/1 Running 0 9h. spec section. It is responsible for monitoring the health of the. 3. kubectl create -f my-replica. kubectl apply -f Service. In the above screenshot, you can see the details of the ponds created after creating a replica set. the old replica sets are not removed they are retained for the versioning. 5. Deploy a sample application and connect the kubectl command-line tool (CLI) to the Kubernetes cluster. Use kubectl directly. 0. Confirm to see if it created the desired number of pods you specified using kubectl get pod As you can see, it has scaled it to four pods. 1 Answer. $ kubectl set image deployment/newsconsumer-deployment. 9 the API version apps/v1 on the ReplicaSet kind is the current version and is enabled by default. Administration with kubeadm. 2. Changes to label selectors make existing pods fall out of ReplicaSet's scope, so if you change labels and label selector the pods are no longer "controlled" by ReplicaSet. 14. answered Apr 1, 2016 at 5:16. Declarative way, edit this line in your Yaml file: replicas: 2. yaml. Deleting a ReplicaSet. On the detail checking of replica set shown that the pod recreated when it’s deleted. List all services and get the nodePort which can be used locally, e. With minikube running now, cd into the mongodb directory in the and execute kubectl create -f . From there it gets labels for replicaset selection. kubectl logs -l=app=. $ kubectl apply -f my-nginx. When you want all replica sets where the numbers for 'desired', 'current' and 'ready' are not the same use a better pattern matching language such awk: kubectl get replicasets -n kube-system | awk '$3!=$4 || $4!=$5 {print $0}' which should return both the header and any inconsistent replica sets. $ kubectl describe hpa <yourHpaName>. Get details of a replica set: kubectl describe replicaset webapp. Create ReplicaSet with 3 Replicas. $ kubectl run my - nginx -- image = nginx. Run the above file using kubectl and create the backend replica set with the provided definition in the yaml file. Also you can read in the documentation Horizontal Pod Autoscaler. $ kubectl get rsNAME DESIRED CURRENT READY AGEmy-first-replicaset 3 3 3 2m// get in the editor, modify the replica number, then save and leave$ kubectl edit rs my-first-replicaset# Please. 与所有其他 Kubernetes API 对象一样，ReplicaSet 也需要 apiVersion 、 kind 、和 metadata 字段。. extensions. 1. The deployment of the replica set will take some time (up to 5 minutes). If you need to get events related to specific objects, this can be achieved by describing an object using the command kubectl describe object/object_name. 1. Create replica set. kubectl replace -f rs-creation. 1 2022. When the control plane creates new Pods for a ReplicaSet, the . Maka dari itu, ReplicaSet seringkali digunakan untuk menjamin ketersediaan dari beberapa Pod identik dalam jumlah tertentu. We run the following command in k8s. 26 introduced a new, alpha-level feature for StatefulSets that controls the ordinal numbering of Pod replicas. This is because Replica Sets are meant to be used as the backend for Deployments. kubectl get pods. Wait until the Pods have been terminated, using kubectl get pods to check their status, then rescale the Deployment back to your intended replica count. mongodb-1 – Read-only replica. 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 is a Kubernetes resource used to maintain a specified number of identical pod replicas within a cluster. apps "myapp-replicas" created Next, we make sure it is created. 220 k8s-worker02 <none> <none> sample-pod3-zmjkj 2/2 Running 0 38s. 1. You can see them with this command: kubectl get pods NAME READY STATUS RESTARTS AGE mongo-0 2/2 Running 0 3m mongo-1 2/2 Running 0 3m mongo-2 2/2 Running 0 3m. [root@controller ~]# kubectl get statefulsets NAME READY AGE nginx-statefulset 0/3 36s. To check the version, use the kubectl version command. List the available daemon sets: [root@controller ~]# kubectl get ds NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR. Define a command to run using --command. And a new pod will spring to life to replace it: NAME READY STATUS RESTARTS AGE LABELS rs-quarkus-demo-2txwk 0/1 ContainerCreating 0 2s app=quarkus-demo,env=dev rs-quarkus-demo-jd6jk 1/1 Running 0 109s app=quarkus-demo,env=dev rs-quarkus-demo-t26gt 1/1. vi <my-replica-set>. Although ReplicaSet's main purpose is to maintain a stable set of replica Pods, it's not a kubernetes object that is commonly created,. So i need to used version in . Delete replica set. Replica-Sets replicate and manage pods, as well. kube. In your case, you've asked Kubernetes to forward traffic on 127. Replica Set is the next generation of Replication Controller. First, find the StatefulSet you want to scale. name of the ReplicaSet is part of the basis for naming those Pods. thank you3- If yes and you update the image name for that deployment. Restartable Batch Job: Concern: Job needs to complete in case of voluntary disruption. Deleting a DaemonSet is a simple task. kubectl get pods <pod-name> -o yaml kubectl get pods my-helloworld-rs-c8rrj -o yaml Step-03: Expose ReplicaSet as a Service ; Expose ReplicaSet with a service (Load Balancer Service) to access the application externally (from internet) Sep 16, 2022 at 21:35. To check the mode of the kube-proxy : (it should be either iptables or ipvs or blank) kubectl get cm -n kube-system kube-proxy -o jsonpath=' {. First pods with your new revision will be created, but replicas of your old ReplicaSet will only be scaled down when you have. By manually modifying the replica set that was created for you, you are fighting with the system controller. To scale up the number of Replica Set members from 3 to 5, run this command: kubectl scale --replicas=5 statefulset mongo. kubectl get pods Node. That means it creates one or more set of the same Pods with the same container (s). Get all Logs from a specific container in a replica set. kubectl get pod,svc -owide NAME READY STATUS. Usually, you define a Deployment and let that Deployment manage ReplicaSets automatically. Modified 3 years,. A link to the MyEd BC portal can be found on the Oak Bay website underReplica Rocks is a Victoria BC company that creates premium resort style outdoor living spaces. replicas | contains(0)) | "kubectl delete rs --namespace=(. Create an IBM Cloud Kubernetes Service cluster. * Does replica set take any action after deleting the pod created outside of its spec ? Why? Scalabilitykubectl describe replica set replicaset_name -n dep_namespace. ReplicaSet immediately creates the pod. Kubectl apply -f <name of the pod> Scaling a ReplicaSet . The kubectl scale command is used to change the number of running replicas inside Kubernetes deployment, replica set, replication controller, and stateful set objects. apps. A ReplicaSet's purpose is to maintain a stable set of replica Pods running at any given time. analogy: Head chef instructs the team of line cooks to prepare a certain dish. This will open the ReplicationController’s YAML definition in your default text editor: bash. where N is the number of Pods in the replica set. Review the output of kubectl api-resources to determine if a resource is namespaced. Conditions: Type Status Reason ---- ----- ----- ReplicaFailure True FailedCreate Events: <none>You can use the kubectl expose command to create a NodePort Service for a ReplicaSet. kubectl get. 08. replicas and all old Replica Sets will be scaled to 0. Autoscaling is also an option with ReplicaSets using kubectl autoscale rs web –max=5. For ReplicaSets, the kind is always just ReplicaSet. kubectl apply -f Service. kind: This is the type of Kubernetes object. Each replica will be created in order from 0-N and deleted in reverse order from N-0. 🕸️Simple Difference Between ReplicaSet and Deployment. If delete ReplicaSet, the corresponding pods will be deleted as well. Deployment is a good fit for managing a stateless application workload on your cluster, where any Pod in the Deployment is interchangeable and can. vi d. The API version apps/v1beta2 is deprecated. In case, these pods go down then this replicaset can use it’s template to replace these pods. Kubenetes: change hpa min-replica. What is a Deployment? A Deployment is a Kubernetes object that manages a set of identical pods, ensuring that a specified number of replicas of the pod are running at any given time. 1. By default, Kubernetes keep 10 replica sets for each deployment, which means you can go back 9 versions prior. Time for scaling! 1st. Certificate. The --cascade option set to "orphan" tells the command to only delete the replicaSet without deleting the pods. Create a stateful set. kubectl get pods frontend-b2zdv -o yaml. You should see an output that looks like the following:When we then look at the Replica set we can see that it was actually deployed a new Replica set with pods running the new image. Code: kubectl get rs. This subresource is well known for resources like deployments and replica sets in Kubernetes, which obviously can be scaled up and down. yaml After some time, we modify d. kubectl scale deployment my-deployment --replicas=3. For ReplicaSets, the kind is always a ReplicaSet. For example, kubectl scale –replicas=2 rs/web. We will explain: What RS is. A ReplicaSet's purpose is to maintain a stable set of replica Pods running at any given time. Scales down all deployments in a whole namespace: kubectl get deploy -n <namespace> -o name | xargs -I % kubectl scale % --replicas=0 -n <namespace>. Delete the CRD object itself, to delete the deployment and other objects (if any) that were created with it. Find the object that "old" rs is controlled by: kubectl describe <rs-name>. Improve this answer. Thanks this one worked. To deploy a replica set using an. Deployments encapsulate replica sets and pods in the Kubernetes’ resource hierarchy and provide a declarative method of updating the state of both. 4. 2 image is utilized. Create a YAML file called replica-set-service. get_my_replicaset_names ()) or. You can use kubectl get pods again to see the unneeded pods being removed. 8. After executing the kubectl scale command to set the replicas to zero, running kubectl get pods will show that there are no Pods running in the default namespace since all the Pods were terminated. The isMaster command will return the list of member hostname:port in the replica set, as entered in the. shell. StatefulSets are designed to run stateful applications in Kubernetes with dedicated persistent storage. $ kubectl apply -f busy-job-completion. Get replicaset. Say we have d. yaml in /kubernetes_experiments and copy the following code to the. First of all, When a pod crashes, k8s doesn't necessarily change the name of the pod, Because as you said, it's restarted, not recreated. $ kubectl edit replicaset new-replica-set . If not: to change this, add . , dedicated=groupName. Get the replica sets list. It uses a template that describes what each Pod must contain. // demonstrate to change the number of Pod replicas. yaml Step 4: Set up Replication Host. 81 9. Only when I cleaned up all replica sets with kubectl delete $(kubectl -o name get rs), new replica set was created, and then everything worked again. namespace!=default status. Note: This is not a production configuration. 0. It seems the actual problem is that deployments are somehow confused by too many old replica sets. 69. – P. kubectl create -f my-replica-set. Dans Kubernetes 1. First, let us know what kubectl is before we get to see the common commands associated with kubectl. For example, kubectl scale –replicas=2 rs/web. In case if you are working in a specific kubernetes namespace then I would recommend using the -n flag. Take a look at the logs for your kube-controller-manager pods. It demonstrates how to create, delete, scale, and update the Pods of StatefulSets. Create replica set. When you increase the replica count, Kubernetes will start new pods to scale up your service. kubectl get service nginx ip=$(kubectl get svc nginx --template={{. Now that you have the ReplicaSet created you can verify the list of ReplicaSet using kubectl get rs command. One method of accessing this declarative interface is through kubectl. Automatically create an associated service with --expose. Tujuan dari ReplicaSet adalah untuk memelihara himpunan stabil dari replika Pod yang sedang berjalan pada satu waktu tertentu. Kubernetes client (kubectl) sent a request to the API server requesting the creation of a ReplicaSet defined in the replicaset-app. A ReplicaSet's purpose is to maintain a stable set of replica Pods running at any given time. Kubernetes Deployment is usually used for stateless applications. 2. Just change the replica count from 2 to 3 and apply the YAML file. They don’t cost much just sitting there in Kubernetes’ etcd store, but if you run monitoring or continuous validation tools, they may be slowing you down. If you need to restart all the pods associated with a deployment, you can use the kubectl rollout restart command. selectorbut whose template does not match . If you are new to the replica set you can read the replica set blog here. name,IMAGE:. Kubectl apply -f <name of the pod> Scaling a ReplicaSet . Hot Network Questions Card game Puzzle Meaning of "the way they used to use up old women, in Russia,. it will reset it back to 3. conf} {" "}' |grep mode. matchLabels: This specifies the labels used for pod selection. kubectl expose pod rabbitmq-0 --port=15672 --target-port=15672 --type=NodePort. extensions "my-first-replicaset" deletedreal 0m2. –. Kubectl logs command cheat sheet. Yes identical Pods. 4 minute read. 08 18:00:57 字数 2,721. Connect and share knowledge within a single location that is structured and easy to search. They behave in a similar way, but they have more expressive pod selectors. Run the command kubectl edit replicaset new-replica-set, modify the image name to busybox and then save the file. Prerequisites. 6. A ReplicaSet is a set of Pod templates that describes a set of Pod replicas. save the file. kubectl apply -f dp. # Get commands with basic output kubectl get services # List all services in the namespace kubectl get pods --all-namespaces # List all pods in all namespaces. If we need to update the application to a new version, we can create a new replica set with the updated configuration and scale down the old replica set. kubectl replace -f replica. The following kubectl command sets the spec with progressDeadlineSeconds to make the controller report lack of progress of a rollout for a Deployment after 10 minutes: kubectl patch deployment/nginx-deployment -p ' {"spec": {"progressDeadlineSeconds":600}}'. Here we go. Replica Sets. Delete All ReplicaSet Pods (Quick. master $ kubectl scale rs frontend --replicas 2 replicaset. $ kubectl scale deploy nginx --replicas=0 deployment. Whenever you deploy new version of deployment, the replica set preserves the previous configuration of the deployment. kubectl get deployments NAME READY UP-TO-DATE AVAILABLE AGE ngnix-deployment 0/3 3 0 12m kubectl. g. You may test it, after deleting the ReplicaSet and then typing the command kubectl get pods into the terminal. Most kubectl commands that support Replication Controllers also support Replica Sets. the old replica sets are not removed they are retained for the versioning. Pods in a replica set are controlled by the Replica Set Definition of the replica set, e. 91 k8s-worker01 <none> <none> sample-pod3-tjsdm 2/2 Running 0 38s 192. yaml. revisionHistoryLimit' 2 $ kubectl get rs NAME DESIRED CURRENT READY AGE nginx-696171888 2 2 2 59s $ kubectl set image. Normally, the old (previous). Install and Set Up kubectl on Windows; Installieren und konfigurieren von kubectl; Kubectl installieren und konfigurieren auf Linux; Kubectl installieren und konfigurieren auf macOS; Installation von Minikube; Einen Cluster verwalten. Before you begin Before you begin this tutorial, you should familiarize yourself with the following Kubernetes concepts: Pods Cluster DNS Headless Services. 4 minute read. Build your first docker image. I would say that you have issue with DNS configuration (No host described in new configuration 1 for replica set rs0 maps to this node). $ kubectl get deploy pet2cattle-o 'jsonpath={. ssh -p 2024 admin@`kubectl get svc -A| grep " ops-center-cee" | awk '{print $4}'` show alerts active. See moreIf you inspect how kubectl does it (by executing kubectl -n my-namespace describe deploy my-deployment --v=9) you will see that it dos the following: first gets. You can get the name of your replication controller using kubectl get rc. yaml and repeate for deployment. Kubernetes Scale Down Replica set. You’ll see a new namespace called mongodb available on your cluster, as shown below. The command will show you the name of the ReplicaSet and the number of desired, current, and ready Pod replicas. mourya ~ % kubectl get statefulset NAME READY AGE web 3/3 68sKubectl rolling update updates Pods and ReplicationControllers in a similar fashion. I want to delete all old replica set once new version successfully deployed. Replica Sets . Here I've set update type to "Recreate". $ kubectl get hpa. The next part in the manifest is the selector field. extensions/frontend scaled master $ kubectl get pods NAME READY STATUS RESTARTS AGE frontend-4jb2x 1/1 Terminating 0 38s frontend-98xkj 0/1. Delete the ReplicaSet Let's clean up before we move on. # Verify k get pods -n sample. $ kubectl get all NAME READY STATUS RESTARTS AGE pod/nginx-854998f596-6jtth 1/1 Running 0 52s NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE service/kubernetes ClusterIP 10. 这是增加部署副本数量的最快、最简. To begin with, create an Express app first.