Scale up the sts kubectl scale --replicas=<number of. El objeto de un ReplicaSet es el de mantener un conjunto estable de réplicas de Pods ejecutándose en todo momento. This can help your applications scale out to meet increased demand or scale in when resources are not needed, thus freeing up your nodes for other applications. 3. Certificate Management with kubeadm; Configuring a cgroup driver; Reconfiguring a. 1. batch/busy-job-completion created $ kubectl get po NAME READY STATUS RESTARTS AGE busy-job-2wg9f 0/1 Completed 0 19m busy-job-completion-bfh49 0/1. We have now logged into the MySQL database. Scaling_and_replica gauravagnihotri$ kubectl get deployment NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE tomcat-deployment 1 1 1 1 3m13s. The MongoDB shell welcome message appears. Possible Solution 2: set minAvailable to quorum-size (e. yml). metadata. Now watch it launch:Use kubectl to scale StatefulSets. yaml Give it a few moments for the image to get pulled and the container is spawned then run kubectl get pods. kubectl get pods Node. 168. Replica Set is a next generation of replication controller. 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:. kubectl get replicaset. $ kubectl get pods -l app=my-app NAME READY STATUS RESTARTS AGE my-rs-5c5f5d5c5c-2vjhx 1/1 Running 0 10s my-rs-5c5f5d5c5c-jv2x2 1/1 Running 0 10s my-rs-5c5f5d5c5c-sz7qx 1/1 Running 0 10s Note: This is just a basic example, in a real-world scenario, you may want to add additional specifications like resource limits,. The $ kubectl get all command will list all the resources from all of your workspace, so that you will have a very good idea of how many PODS, Deployments, Services, and Replica Sets are running inside your Kubernetes cluster. To check the version, use the kubectl version command. With kubectl you can use the kubectl logs command. $ kubectl create -f <replicaSet_file_name>. 4. Show that it runs in 3 pods mongodb-replicaset-0, mongodb-replicaset-1, mongodb-replicaset-2. The selector is used to identifying the Pods it can acquire. One method of accessing this declarative interface is through kubectl. In the replica sets, we used the selector. 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. yaml. Kubernetes provides several built-in workload resources: Deployment and ReplicaSet (replacing the legacy resource ReplicationController). yml. The isMaster command will return the list of member hostname:port in the replica set, as entered in the. 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 hpa <yourHpaName>. test. kubectl apply -f creates Replica Sets using a config file: kubectl apply -f replicaset-definition-file. When pods run as part of a StatefulSet, Kubernetes keeps state data in the persistent storage volumes of the StatefulSet, even if the pods shut down. When you increase the replica count, Kubernetes will start new pods to scale up your service. but answer still same. Follow edited Dec 26, 2018 at 9:32. Can you try kubectl get deploy --field-selector metadata. revisionHistoryLimit in the Deployment to the number of old replica sets you want to retain. Normally, the old (previous). 0. One exception is the rolling-update command. 3. kubectl get hpa After a few minutes, with minimal load on the Azure Store Front app, the number of pod replicas decreases to three. kubectl scale replicaset nginxset --replicas=4. With minikube running now, cd into the mongodb directory in the and execute kubectl create -f . The driver will attempt to connect to each host in the seed list in turn, and once it gets a connection will run isMaster. Other Posts. # Create ReplicaSet kubectl apply -f 02-replicaset-definition. # Replace "hello-4111706356" with the job name in your system pods = $(kubectl get pods --selector = job-name = hello-4111706356 --output = jsonpath ={. Improve this answer. In a real-life Postgres example, you’d use your init containers to set up database replication from the primary Pod to the replicas. $ kubectl create -f deploy. Improve this answer. Deployments encapsulate replica sets and pods in the Kubernetes’ resource hierarchy and provide a declarative method of updating the state of both. kubectl logs -f -n namespace pod-id-here But what if there are 3 replicas of that Pod? There are some bash scripts and other utilities like Kubetail and Stern that make it somewhat easy to do. 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. If delete ReplicaSet, the corresponding pods will be deleted as well. get: Prints basic information about matching objects. A ReplicaSet's purpose is to maintain a stable set of replica Pods running at any given time. In stateful applications, it’s important that a given replica keeps the initially assigned PV even if pods get rescheduled. 7k 2 38 55. 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. Get a idea from yaml file. yaml. 99, which will hopefully weed out any unserious sellers and allow us to focus on those who truly want to sell to. I have deployed a mongodb replicaset (v6. Scaling the replicaset can be done by using two methods. Get the running Pods list. This will log out a good starting template for you to copy and paste, and get up to speed. Each replica will be created in order from 0-N and deleted in reverse order from N-0. You may test it, after deleting the ReplicaSet and then typing the command kubectl get pods into the terminal. [root@localhost ~]# kubectl get rs NAME DESIRED CURRENT READY AGE web-app 2 2 2 70s To verify the replicas created by the ReplicaSet YAML file you can use kubectl get. kubectl describe replicaset {NAME. The same can be achieved with kubectl create -f ( -f is a flag for specifying file. Open your terminal, and run the kubectl create command below to create a new namespace ( ns ) called mongodb on your Kubernetes cluster. And the -w argument is for watch so you have a refreshed interface that gives you infos on your hpa ressources. The kubectl scale command is used to change the number of running replicas inside Kubernetes deployment, replica set, replication controller, and stateful set objects. After being updated, the Deployment kills all pods at once, and starts new version of pods with the same amount of replicas. By adjusting the value in the manifest and re-applying it, you can alter the number of copies (kubectl apply -f my-manifest. Restartable Batch Job: Concern: Job needs to complete in case of voluntary disruption. You’ll get that service/service23 created. Also,instead of replicationcontrollers, you can use replica sets. Yes identical Pods. You’ll see a new namespace called mongodb available on your cluster, as shown below. For ReplicaSets, the kind is always a ReplicaSet. kubectl replace -f rs-creation. HPA is a form of autoscaling that increases or decreases the number of pods in a replication controller, deployment, replica set, or stateful set based on CPU utilization—the scaling is horizontal because it affects the number of instances rather than the resources allocated to a single container. To create a replica said execute the following command. 28. Certificate. When we fire delete to remove the resource, it removes the target objects forcefully: $ time kubectl delete rs my-first-replicaset && kubectl get podreplicaset. I tested this on kubernetes 1. When you. 今回はkubectl scale コマンドを使ってreplicasetのレプリカ数を6個に増やしてみる. Try kubectl get deployment --namespace=kube-system to see if you have a deployment in the kube-system namespace. So, chances are you want to be listing the deployments instead of the services in this case. It will expose the port permanently but without load balancing. 3. The name of a DaemonSet object must be a valid DNS subdomain name. 1. Get Pods. But the deployment controller will see that the current count of the replica set is 5 and since it knows that it is supposed to be 3, it will reset it bac A ReplicaSet is one of the Kubernetes controllers that makes sure we have a specified number of pod replicas running. Scaling the replicaset can be done by using two methods. Replica sets ensure that the desired (minimum) number of replicas of a stateless pod for a given application are running. kubectl edit daemonset -n logging #shortcut for daemonset is ds kubectl get ds Apply Taint and Tolerations For Daemonset. In simple words, an instance of a Pod is a Replica. $ 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. Add a comment. List all services and get the nodePort which can be used locally, e. If you created HPA you can check current status using command. Even though the new replica set is created. Their purpose is to keep a set of identical pods running and upgrade them in a controlled way. Share. $ kubectl apply -f deployment. Find the object that "old" rs is controlled by: kubectl describe <rs-name>. A ReplicaSet's purpose is to maintain a stable set of replica Pods running at any given time. metadata. kubectl create -f replicaset. First find the pvs: kubectl get pv -n {namespace} Then delete the pv in order set status to Terminating. The output will look similar to this, with the frontend ReplicaSet’s info set in the metadata’s. When we fire delete to remove the resource, it removes the target objects forcefully: $ time kubectl delete rs my-first-replicaset && kubectl get podreplicaset. // demonstrate to change the number of Pod replicas. 1k 1. You will note if you do kubectl get pods, that they are still broken. If you need to restart all the pods associated with a deployment, you can use the kubectl rollout restart command. For example, kubectl scale –replicas=2 rs/web. To learn more about replica sets, see the Replication Introduction in the MongoDB manual. El objeto de un ReplicaSet es el de mantener un conjunto estable de réplicas de Pods ejecutándose en todo momento. yaml. The output is similar to this:Label Selectors is used to identify a set of objects in Kubernetes. kubectl get hpa constant-load-test -n hpa-constant-load. Declarative way, edit this line in your Yaml file: replicas: 2. They behave in a similar way, but they have more expressive pod selectors. This will make the old replica set get drained before the new one is started. The replication controller only supports equality-based selector whereas the replica set supports set-based selector i. Thanks this one worked. Writing a ReplicaSet manifest. yaml job. The above condition sets the replica count of NGINX deployment to 2 only if the current replica count is 1. I have deployment and a replica set in Kubernetes that are failing to create a pod. kubectl get replicaset. kubectl create -f statefulset. One exception is the rolling-update command. Information will be in Events: section. Así, se usa en numerosas ocasiones para garantizar la disponibilidad de un número específico de Pods idénticos. This way the deployment will be marked as paused and won't be reconciled by the controller. In order to remove the ReplicaSet from the Kubernetes system, you can rely on the subcommand delete. At the end, we can also check for the pods that are brought up by running the below command. yaml replicaset. Nov 19, 2019 at 15:14. In case if you are working in a specific kubernetes namespace then I would recommend using the -n flag. You can insert a key into the primary instance of the MongoDB Replica Set by running the following: MASTER_POD_NAME must be replaced with the name of the master found in the previous step. name of the ReplicaSet is part of the basis for naming those Pods. the old replica sets are not removed they are retained for the versioning. About; Products. 🕸️Simple Difference Between ReplicaSet and Deployment. Pods run in node and node is the worker in kubernetes. As of Kubernetes v1. kubectl get pod,svc -owide NAME READY STATUS. $ kubectl apply -f my-pod. Code: kubectl describe rs/frontend. This tutorial provides an introduction to managing applications with StatefulSets. 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. # kubectl delete rs soaktestrs replicaset "soaktestrs" deleted # kubectl get pods Again, the pods that were created are deleted when we delete the Replica Set. # Run kubectl to connect inside the container kubectl run curl --image = dareyregistry/curl -i--tty # Type curl and your container's ip curl -v 10. $ 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. Pro tip! To save time you can use kubectl to generate the YAML file boilerplate by running; kubectl create deployment --image=awesome-app-image awesome-app-deployment --dry-run -o yaml. Replication Controller and Replica Set do almost the same thing. If you want the rolling update functionality please consider using Deployments instead. 13. Use this procedure to create a new replica set in a member Kubernetes cluster in a multi-Kubernetes-cluster deployment. statefulset. Scaling_and_replica gauravagnihotri$ kubectl get deployment NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE tomcat-deployment 1 1 1 1 3m13s. ssh -p 2024 admin@`kubectl get svc -A| grep " ops-center-cee" | awk '{print $4}'` show alerts active. Try kubectl rollout restart sts <sts name> command. The output will look similar to this, with the frontend ReplicaSet's info set in the metadata's. kubectl get replicaset. Here, I’m scaling down the ReplicaSet used in the article’s example to manage two pods instead of four. describe: Prints aggregated detailed information about matching objects. A simple case is to create one ReplicationController object to reliably run one instance of a Pod indefinitely. Run kubectl get rs to see the deployed replicaset kubectl get rs. kubectl logs -l=app= {app-name} -c= {container-name} -n= {namespace} As you can see the options with the kubectl logs -h command. When the request comes to the Service via the NodePort, it gets routed to one of the Pods in the Replica Set. Replica sets provide redundancy and high availability and are the basis for all production deployments. Define a command to run using --command. Get replicaset. To get more information about a specific replica set, run the command: $ kubectl describe replicasets <replicasetname> List ReplicaSets Info Services in Pods. It is responsible for monitoring the health of the. $ kubectl run my - nginx -- image = nginx. namespace!=default status. The above command will generate the. Key DifferencesI have written a bash script to get all deployments on a kubernetes cluster. Deploy a sample application and connect the kubectl command-line tool (CLI) to the Kubernetes cluster. Time for scaling! 1st. 6. This subresource is well known for resources like deployments and replica sets in Kubernetes, which obviously can be scaled up and down. Viewed 9k timesSave the file as rc-definition. Also Verify if there are any issues with pods kubectl get pods -A. 1 Answer. Add a comment | 20. Along with the Deployments came the Replica Sets (RS), a kind of more powerful RC (supporting set-based labels). yaml 384 clear 385 kubectl get pods 386 kubectl delete deploy my-dep 387 clear 388 kubectl get pods 389 clear 390 kubectl get pods 391 kubectl apply -f pod1. To update a Kubernetes deployment we can simply update its config file using 2. you can create a new ReplicationController with the proper label selector and manage them again. We run the following command in k8s. Follow. $ kubectl delete all --selector=<key>=<value> -n <namespace> or $ kubectl delete all -l <key>=<value> -n. A ReplicaSet is a Kubernetes resource used to maintain a specified number of identical pod replicas within a cluster. Dans Kubernetes 1. Frequently, when deploying a specific pod-template, the deployment fails to create a successful replicaset and no instance is created. Run the above file using kubectl and create the backend replica set with the provided definition in the yaml file. Run the command kubectl get pods and count the number of pods. As soon as the load generator script is stopped, there’s a cool down period, and after 1 minute or so the replica set is lowered to the. Get all Logs from a specific container in a replica set. . kubectl apply -f Service. Replica Sets. Once the Mongodb replicaSet is up, cd into the user-service and execute kubectl create -f . Advantage – . yml kubectl get replicaset kubectl get pods. Reading the documents it is not clear if the default behaviour should. To view these you can do kubectl get deployment, and get rs respectively. Old Replica set are removed. 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. Replica Sets. 9 the API version apps/v1 on the ReplicaSet kind is the current version and is enabled by default. Deployments are essentially a nicer way to perform rolling update server side, but there's a little more to it. I want to delete all old replica set once new version successfully deployed. When connecting to a replica set, the hostnames and IP addresses in the connection string are the seed list. I assume that you want the default 'rolling upgrade' behavior of Deployments: they create a new replica set and start it before the old one is drained (rolling upgrade). $ kubectl get replicasets View ReplicaSets on Cluster. We manufacture concrete panels to build themed environments, custom. 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. The pod is the thing that is replicated. 31 (a downgrade but still an update from K8s point of view), the ReplicaSet is not completely replaced. , dedicated=groupName. If you run kubectl get pods <pod_name> -o yaml where <pod_name> is a pod created by ReplicaSet, you will see owner reference. kubectl get pods. Sep 16, 2022 at 21:35. Display information about the ReplicaSet in the current namespace $. Output: NAME DESIRED CURRENT READY AGE nodeapp-deployment-56865dcdf6 5 5 5 52s. First pods with your new revision will be created, but replicas of your old ReplicaSet will only be scaled down when you have. (Allows more disruptions at once). Now let’s inspect the ownerReferences of the ReplicaSet. 6. We are using Kubernetes 1. kubectl describe pod pod_name -n. Once the commands run, Kubernetes will action the. This is because Replica Sets are meant to be used as the backend for Deployments. This blog post will discuss how this feature can be used. The only difference between a Replica Set and a Replication Controller right now is the selector support. NAME. You can use: kubectl get hpa -A -w. sharma@knoldus. yaml. The same can be achieved with kubectl create -f ( -f is a flag for specifying file. kubectl get events -w. Administration with kubeadm. kubectl get events -o json You can also get events through a specific namespace by using the --namespace=${NAMESPACE} flag. When I check rollout status the replicas are not being available. Review the output of kubectl api-resources to determine if a resource is namespaced. $ kubectl get ats NAME CREATED AT ats. kubectl scale --replicas=10 -f rs-creation. The example topology has a single primary server and multiple replicas, using asynchronous row-based replication. data. First, check the existing replica set using the following command. kubectl apply -f stateful-set. Prerequisites. kubectl get replicaset. kubectl get pvc NAME STATUS VOLUME CAPACITY ACCESS mysql-store-mysql-set-0 Bound pvc-e0567d43ffc6405b 10Gi RWO Last, get the storage class list: kubectl get storageclass NAME. $ kubectl get pod NAME READY STATUS RESTARTS AGE myapp-replicas-67rkp 1/1 Running 0 33s myapp-replicas-6kfd8 1/1 Running 0 33s myapp-replicas-s96sg. Así, se usa en numerosas ocasiones para garantizar la disponibilidad de un número específico de Pods idénticos. analogy: Head chef instructs the team of line cooks to prepare a certain dish. $ 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. You should get just 1 deployment. kubectl apply-f my-manifest. Services provide discovery and routing between pods. By default, Kubernetes keep 10 replica sets for each deployment, which means you can go back 9 versions prior. $ kubectl get pod -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES sample-pod3-rzmhb 2/2 Running 0 38s 192. 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. kubectl get --all-namespaces rs -o json|jq -r '. The . it will reset it back to 3. insert({key1: ‘value1’}))” 3. $ 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. kubectl get statefulset Output - all three members are up: NAME READY AGE mongo 3/3 103s Initiating and Viewing the MongoDB replica set. deployment "my-nginx" created. It specifies that there should be three replicas of the Deployment and that each pod should be labeled with app: nginx. 1. Delete a pod. Once you are done we can delete the pod by running the kubectl delete command. The main difference between a Replica Set and a Replication Controller right now is the selector support. The. spec. Identical Pods are known as Replicas. Build your first docker image. Kubernetes Replication Controller vs Deployment You need to use -c flag to specify the Container name. $ kubectl get pods,replicasets --show-labels NAME READY STATUS RESTARTS AGE LABELS pod/kuard-fm8fd 1/1 Running 0 11m app=kuard pod/kuard-j6fcf 1/1 Running 0 11m app=kuard pod/kuard-jmqjv 1/1. g. This should create the replica sets for MongoDb. It will show the number of desired Pods, Ready Pods, and Current Pods count. Display information about the ReplicaSet in the current namespace $ kubectl get replicaset. Taints and Tolerations are the Kubernetes feature that allows you to ensure that. name=rolling-nginx-74cf96d8bb-6f54x LAST SEEN TYPE REASON OBJECT MESSAGE 5m21s. 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. Kubernetes client (kubectl) sent a request to the API server requesting the creation of a ReplicaSet defined in the replicaset-app. 0. After this, you can see the details of external-service using the following command: shell. An Azure Arc-enabled SQL Managed Instance deployed with one replica (default) View the pods. They also monitor and ensure the required number of. Apply the YAML with kubectl. Now that you have the ReplicaSet created you can verify the list of ReplicaSet using kubectl get rs command. DaemonSets create Pods on every node in the cluster by default, unless node selectors constrain them. If you list the Pods, you will notice that five Pods are running: $ Kubectl get Pods NAME READY STATUS RESTARTS AGE my-replicaset-89dkw 1/1 Running 0 4m15s You can see that the number of Replica and the running instance of a Pod are the same as the number specified in the manifest file replicas field. 0. answered Dec 26. The following imperative command helped me remove all the pods in a ReplicaSet without deleting the ReplicaSet. yaml After some time, we modify d. kubectl get rc/nginx-rc kubectl get rc/nginx-rc -o wide kubectl get rc/nginx-rc -o yaml kubectl get rc/nginx-rc -o json. Dans Kubernetes 1. It can be considered as a replacement of replication controller. This procedure allows you to set different settings for the replica set resource, such as overrides for statefulSet configuration. Try running kubectl get deployments and deleting the deployment from the output of that command. kubectl get replicaset. yaml and execute the kubectl apply command to deploy the replication controller. 4 minute read. # Apply latest changes to ReplicaSet kubectl replace -f replicaset-demo. yaml Check the status of the autoscaler using the kubectl get hpa command. Here I've set update type to "Recreate". kubectl edit pod <Name of the Pod> Step 3: Apply the pod by using the following command. A ReplicationController is similar to a process supervisor, but instead of supervising individual processes on a single node, the ReplicationController supervises multiple pods across multiple nodes. Use this procedure to deploy a new replica set that Ops Manager. To check if HPA worked you have to describe it. You can also verify the pods running with the label tier=nginx using kubectl get pods -l tier=nginx command. Then use NodeSelector in the deployment/pod. kubectl get statefulsets <stateful-set-name>. 12. To set up pod replication: 1. analogy: Display information of line cooks currently working in the kitchen. To master Kubernetes, you need to understand how. Learn more about Teamskubectl get pods -l 'env in (development, testing)' kubectl get pods -l 'env notin (development, testing). replicas: It specifies the desired number of replicas (pods) to maintain. a number of replicas indicating how many Pods it should be maintaining. kubectl get pods will list all of a user’s pods in the namespace in which they are running the command, whereas kubectl get all –all. We can also verify the running service: kubectl get svc. 0. The pods, replica sets will get deleted. Ask Question Asked 5 years, 3 months ago. If there is a very large number of Pods, though. 2. However if you change labels and run the same. Run this command to view: kubectl get pods Output:We can run kubectl get rs to see that the Deployment updated the Pods by creating a new Replica Set and scaling it up to 3 replicas, as well as scaling down the old Replica Set to 0 replicas. And they both say. If we re-create our replicaSet using the "kubectl create" command, the replicaSet " replica_1" will get re-attached to the pods above. 3. $ kubectl get pvc -n redis redis-claim-redis-ss-0 Bound pvc-8a30a867-8b3e-49c2-ac1d. conf} {" "}' |grep mode. Note: if you run the. # kubectl get event --field-selector involvedObject. yaml replicaset. Lastly, you can describe your pods to see if they are failing the health checks. If you set your namespace above using the set-context command then the pods will be created in the specified namespace. This is where you specify how the ReplicaSet. For example, deploying the same. 80 383 more pod1. If 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 deployment details with: /apis/extensions/v1beta1/namespaces/my-namespace/deployments/my-deployment. ReplicaSetのreplica数を増減させる. Time for scaling! 1st. In this blog post we are going to discuss the ReplicaSet concept in Kubernetes. They are handy when it comes to rolling out changes to a set of pods via a ReplicaSet. We often don’t need to create a ReplicaSet directly. A ReplicaSet’s purpose is to maintain a stable set of replica Pods running at any given time. Check the track of deployment and even we can use this for. Replica set, also termed as rs in short, is almost same as the replication controller is, only with a single difference. mongodb-2 – Read-only replica. In your case, you've asked Kubernetes to forward traffic on 127. In Kubernetes it is possible to delete rs in a following way: Find the name for "old" rs with kubectl get replicaset -n kube-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. print (k8s. 4. 168. ReplicaSets compared to Deployments. 8. $ kubectl apply -f replicaset. To obtain them, follow the instructions below: MongoDB® nodes domain: you can reach MongoDB® nodes on any of the K8s nodes external IPs. Definition – It is a Kubernetes object that maintains the number of pods (i.