More precisely, a Deployment creates a ReplicaSet which then creates a set of identical, steteless, pods, w. The Pods and ReplicaSets are replaced individually, allowing old and new versions to briefly coexist. Deployment Patterns for MongoDB Replica Set. As such, it is often used to guarantee the availability of a specified. ConclusionThough the Deployment is more suitable than the ReplicaSet, this answer focuses on ReplicaSet over Pod cause the question is between the Pod and ReplicaSet. When you increase the replica count, to scale up your service. For example, the following commands connect to a deployment running on localhost port 28015: mongosh "mongodb://localhost:28015". Like a Deployment, a StatefulSet manages Pods that are based on an identical container spec. I am not going to explain this approach in details because the link I provided is quite. The following is an example ReplicaSet definition: apiVersion: apps/v1 kind:. how to get all replicaset names inside a container. It is generated by hashing the PodTemplate of the ReplicaSet and using the resulting hash as the label value that is added to the. Deleting the Pod will kick in the current deployment configuration to be applied by Kubernetes to restart and redeploy the Pod. Deployment is recommended for application services. To deploy a replica set using an object, you must: Have or create an Ops Manager instance or a Cloud Manager organization. The Deployment can manage multiple ReplicaSets in order to perfom rolling update of the. Created NGINX deployment updated multiple times and generate few replicaset. Most commonly used component types are pod, deployment, replicaset, statefulset, services and so on. When a Deployment is changed, the previous ReplicaSet needs to. kubectl delete deploy inginx-deploy. The ReplicaSet controller ensures that a specific number of Pods are running. ReplicaSet is the next-generation ReplicationController that. Once your Pods have started, you can scale the StatefulSet up or down without risking the destruction of the MySQL primary node. Say we have d. This hostname can be a hostname, an FQDN, an IPv4 address, or an IPv6 address. Avoid complexity when possible, but let your application requirements dictate the architecture. Add a new member to an existing replica set. io/revision: "4" This will exist on both the deployment and the replicaset. 式的定义方法，在 Deployment 对象中描述一个期望的状态，Deployment 控制器就会按照一定的控制 速率把实际状态改成期望状态，通过定义一个 Deployment 控制器会创建一个新的. default 22m 22m 1 wordpress-686ccd47b4. Have or install the MongoDB Enterprise Kubernetes Operator. selector field defines how the created ReplicaSet finds which Pods to manage. To learn more about replica sets, see the Replication Introduction in the MongoDB manual. StatefulSet と PVC の関係まとめ. ReplicaSets will create and scale Pods based on the triggers you specify in your Deployment. The Kubernetes docs explicitly suggest using a deployment rather than a ReplicaSet directly. The --port command-line option. spec. In the case of a Job, update parallelism only if the current parallelism value matches. kubernetes. x ReplicaSet. In the case of a Job, update parallelism only if the current parallelism value matches. Reload to refresh your session. Kubernetes events are a resource type in Kubernetes that are automatically created when other resources have state changes, errors, or other messages that should be broadcast to the system. 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. I just wanted a container! Why do I get three different objects?The state of a deployment is saved which allows us to rollback to previous versions of a deployment. Let’s first take a look at how should we create a ReplicaSet. The Deployment creates a ReplicaSet that creates three replicated Pods, indicated by the . kubectl get replicaset. From kubernetes terminology you can delete any component with below pattern. Replica Count: The number of replicas (pods) the controller should always be. Here the replicas field is set to 3, but you can set it to whatever fits your application. Step #1. So, keeping a Pod(s) inside the ReplicaSet inside the Deployment makes for a highly effective hierarchy layer in Kubernetes. We also covered hands-on Lab 14 , Lab 15 , Lab 16 , Lab 17 Lab 22 & Lab 24 out of our 30+ extensive labs. Deployment Strategy. The next part in the manifest is the selector field. For Deployment, ReplicaSet, Replication Controller, only scale, if the number of existing replicas matches. If a node is added/removed from a cluster, DaemonSet automatically adds/deletes the pod. Process Name. The Deployment helps move between different versions of applications in the above diagram by moving between different Replicaset versions. core 2. Ta thấy kết quả trả về có 1 ReplicaSet có tên là myapp-deployment-549fd4bf6c. Related content: read our guide to Kubernetes Persistent Volumes. 2. Use when strategy = canary. 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. It also needs to check whether the target pod is already managed by another controller (like a Deployment or another ReplicaSet). The standard replica set deployment for a production system is a three-member replica set. If you are not connected to your deployment, you can determine your connection string based on the connection type you want to use. Can also be specified via K8S_AUTH_HOST environment variable. Check if there are any finalizers which block delition. 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. View the details of the deployed service. Here is the manifest file which will make sure that the deployment of your web application has 3 replicasets always up and running. Tuy nhiên, Deployment Controller, 1 khái niệm ở mức cao hơn sẽ quản lý các ReplicaSet và cung cấp các cập nhật cho pod kèm theo các tính năng hữu ích khác. Summary. Replicaset will only ensure that the replicas number of pods will be created on other nodes during the process. StatefulSet is also a Controller but unlike Deployments, it doesn’t create ReplicaSet rather itself. Does any one have implemented blue green deployment while cleaning the old stuff?The solution(s) : Use a StatefulSet, ReplicaSet or DaemonSet to ensure the Pod creation after a Node failure. revisionHistoryLimit is an optional field that specifies the number of old ReplicaSets to retain to allow rollback. Allowed values: pod, smi. There are many private registries in use. StatefulSet lets you run one or more related Pods that do track state. A Replicaset is a K8s object, a set of Pod templates that describe a set of Pod replicas. The Scheduler, that is in charge of the pod resource allocation, commnd the kubelet, which reside on every worker nodes,. Declarative way, edit this line in your Yaml file: replicas: 2. Completar un. Replica sets can be added to any peered virtual network in any Azure region that supports Domain Services. Rolling deployment is the default strategy in Kubernetes. apps values should count 2 available instances. metadata: annotations: deployment. El Deployment crea un nuevo ReplicaSet. spec. 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. The selectorfield under specdefines how this ReplicaSet identifies the pods it needs to manage. Click the Save button. In other words, a Deployment makes sure that a pod or homogeneous set of pods are always up and available. A replica set is a group of mongod instances that maintain the same data set. there is a Kubernetes Deployment that recreates it. Deployment is an abstraction over ReplicaSet. From the above, it should be clear that there is a Deployment with a single ReplicaSet that contains a single Pod running the busybox image. ReplicaSetCondition describes the state of a replica set at a certain point. Ok, let me explain. Deployment is a higher-level concept that manages ReplicaSets and provides declarative updates to Pods. 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. kubectl scale deployment <deployment-name> --replicas=3 My. The kubectl set env command updates the environment variables for a Kubernetes resource, such as a Deployment, ReplicaSet, or StatefulSet. Deployments have two main disadvantages compared with StatefulSets and DaemonSets. Once the MongoDB resource is created, the operator will deploy a new. yml deployment. of pods as mentioned in the yaml file. This means you can start with a Pod, and after a while you can add it to a Replicaset if you want to. You can define a deployment to create a ReplicaSet or to remove deployments and adopt all their resources with new deployments. By default, 10 old ReplicaSets will be kept, however its ideal value depends on the frequency and stability of new Deployments. The deployment controller extends the ReplicaSet Controller and is responsible for rolling out software updates when you create pods with deployment resources and update them with new versions of your software. We have noticed in logs that pods, for old ReplicaSet (which still exists on the cluster), are regularly executed. selector field defines how the created ReplicaSet finds which Pods to manage. ReplicaSet will ensure that the desired no. A replica set is a group of MongoDB deployments that maintain the same data set. But what ends up happening is all the pods in the replicaset inside the deployment will end up using the same shared volume and end up modifying the same data on disk. Always use a replica set in production. The ReplicaSet config file has two important features: Pod Template: A template for new Kubernetes pods. kubectl get deployment, replicaset, pod Update a deployment. Kubernetes Documentation. create a deployment. yaml and you see that replicaset is not deleted - try to kubectl get replicaset xxxxxxx -o json and same for at least 1 pod in this replicaset. 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 ensures that a specified number of Pod replicas are running continuously and helps with load-balancing in case of an increase in resource usage. By using the command kubectl delete rs <rs name>, where rs name is the name of your ReplicaSet, you can destroy ReplicaSets. In the case of a Job, this option is ignored. the old replica sets are not removed they are retained for the versioning. This way it will create a new replicaset with updated configuration. While this command doesn’t explicitly restart any Pods, it. r. The user can specify a different scheduler for the Pods of the DaemonSet, by setting the . As per the name, ReplicaSet is used for managing the replicas. Under the hood, Deployment creates a ReplicaSet which in turn creates pods on our cluster. The Deployment can then manage the cleanup of older unused ReplicaSet s. Replica Set is the next generation of Replication Controller. Choose the deployment node from the list in the command output. , but they are recreated again. Convert a Standalone mongod to a Replica Set. 3. Use kubectl to list information about the deployment. ObservedGeneration reflects the generation of the most recently observed ReplicaSet. 由於 ReplicaSet 本身也會控制 Pod ，所以整個整體看起來就會像是 Deployment 控制著 Pod ，但其實Deployment 真正控制的是 ReplicaSet 喔！ Open the Create New Database Deployment dialog box. This document provides strategies for replica set deployments and describes common architectures. It's important to note that Deployment objects are used to manage stateless applications. They let you perform rolling updates of ReplicaSets, where Pods are rescheduled. Now you have the Pods of the deployment running. Provide a URL for accessing the API. Use this procedure to deploy a new replica set that Ops Manager. A standalone instance isn't a good choice for a production deployment because it can be a single point of failure. Without it, ReplicaSet might create new pods when existing pods are deleted. Note: A Deployment that configures a ReplicaSet is now the recommended way to set up replication. Deployment works one level above ReplicaSet object. Number of seconds to sleep between checks. 1. replicas: 2 a new ReplicaSet is created, and it observes the. When you increase the replica count, Kubernetes will start new pods to scale up your service. If you see the logs, they are starting from 73, meaning that the previous pod had written till 72 in the file and. Now we have created a deployment and need to verify if the Nginx web servers were deployed correctly. 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. A standalone mongod instance is useful for testing and development. In other words, a ReplicationController makes sure that a pod or a. The deployment process for Deployments is driven by a controller loop, in contrast to DeploymentConfigs which use deployer pods for every new rollout. The standard replica set deployment for a production system is a three-member replica set. Use this procedure to deploy a new replica set managed by Cloud. In the above screenshot, you can see the details of the ponds created after creating a replica set. spec. Before you begin You need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to. As soon as new pods are started and ready. You’ve completed the deployment of the MongoDB operator and ReplicaSets to your Kubernetes cluster at this point. Pod baru menjadi siap atau dapat diakses (siap selama setidaknya MinReadySeconds). When a new version of an application is deployed, the Deployment creates a new ReplicaSet with. The ReplicaSet creates Pods in the background. apps/kuard created $ kubectl get deployment,replicaset,pod --show-labels NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE LABELS deployment. Replication in MongoDB. Cet objet est souvent utilisé pour garantir la disponibilité d'un certain nombre identique de Pods. 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. revisionHistoryLimit is an optional field that specifies the number of old ReplicaSets to retain to allow rollback. yaml, this will instruct Kubernetes to scale the current number of Pods to the value of. When to use a ReplicaSet. replicas property from the YAML file. kubectl get pods --namespace=custom-namespaceThis page shows how to create a Pod that uses a Secret to pull an image from a private container image registry or repository. 18 the kubectl run will no longer create deployments but pods. To get the name just read the environment variable HOSTNAME. Deployment adalah sebuah objek yang bisa memiliki ReplicaSet dan memperbarui ReplicaSet dan Pod-nya melalui rolling update deklaratif dan server-side. spec. As we can find in the Kubernetes ReplicaSet documentation: Deployment is a higher-level concept that manages ReplicaSets and provides declarative updates to Pods along with a lot of other useful features. Its yaml file is very much similar to replicaset's yaml file. As mentioned in the previous section, there are two ways to define or configure a ReplicaSet; directly through a YAML configuration file or through a deployment. Ops Manager displays the Editing Replica Set view. , 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. Therefore, we recommend using Deployments instead of directly using ReplicaSets, unless you require custom update orchestration or don't require updates at. It ensures that the desired number of replicas (PODs with the application running), as mentioned while creating the Replicaset, is always maintained. For all intents and purposes just use Deployments now. The following Deployment definition deploys four pods with nginx as their hosted application:Select the feature compatibility set . Now that we have learned about ReplicaSet and Deployment, let’s summarize their key differences: Abstraction level: A Deployment is a higher-level abstraction that. It can. Tiếp. root@k8s:. With deployment you should be able to do rolling upgrade or rollback. 4. 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. After you destroy the ReplicaSet, the running Pods will also get deleted. Overview. A ReplicaSet is a Kubernetes object that ensures that a specified number of replicas of a pod are running at any given time. The deployment file contains details for a ReplicaSet that includes a PodTemplate. Specifically, we define the desired state of the application using DeploymentSpec. Ta thấy kết quả trả về có 1 ReplicaSet có tên là myapp-deployment-549fd4bf6c. configure ArgoCD / FluxCD / other deployment tool to delete them. As we know, Kubernetes has the features of Self Healing, High. In the simplest case, a deployment just creates a new replication. The standard replica set deployment for a production system is a three-member replica set. The Deployment is managing the ReplicaSet and the ReplicaSet is managing the pods. yml. Click the. This replica will further create a pod with name web-app-<replica-set->-<pod-id>. The trailing ReplicaSets that you can see after deployment deletion depends of the Revision History Limit that you have in your Deployment. This task uses Docker Hub as an example registry. This way you could either, name the stateful-set according to the classes, i. This option is mandatory as we aren’t updating the value of the spec. of pods are matching the specified no. But the replicas attribute on the Deployment object is actually related to this object. When your Pod's part of a ReplicaSet or Deployment, you can initiate a replacement by simply deleting it. We run the following command in k8s. When you create a Deployment in Kubernetes, a ReplicaSet is created automatically. Then, the Deployment controller constantly works and monitors to ensure the actual state is as expected. In summary, Controller reads the Deployment spec, forwards the pod configuration to ReplicaSet and then it creates the pods with. 1. A Deployment creates Replicaset. Since the required number of pods is maintained and monitored, they're running and available after the deployment is created. 4. Sep 16, 2022 at 21:35. I'll post my answer with the full code example later if no one else replies to my question. The Deployment creates a ReplicaSet that creates three replicated Pods, indicated by the . By default, every Deployment is set to 10 for reserving the old. spec. 8. spec. A replica set, also known as a cluster, provides redundancy and availability. Accordingly Replicaset is owned by Deployment Alternatives to ReplicaSet: Deployment (recommended). 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。. but the problem is i need to clean all old deployment and replica set once new version deployed successfully. Deploy ReplicaSet. The ReplicaSet is responsible to manage the Pods. You can define a ReplicaSet using a YAML file. Update the deployment. The . # Create the MySQL StatefulSetusing deployment we can undo deployment, pause deployment, resume deployment. Here you see that when you first created the Deployment, it created a ReplicaSet (nginx-deployment-2035384211) and scaled it up to 3 replicas directly. As per the name, ReplicaSet is used for managing the replicas of our pods. 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. When we create a deployment, the relevant controller automatically creates the replicaset, and. Kubernetes Deployment is usually used for stateless applications. Create a deployment. 7. StatefulSet (stable-GA in k8s v1. As an alternative to using this procedure, you can use. Previously, we have learned how to roll back to an old version in case of an issue with a current deployment. Kubernetes has emerged as the de facto standard for container orchestration. yaml --namespace=custom-namespace. Implementation mechanism of garbage collection. You can expand a managed domain to have more than one replica set per Microsoft Entra tenant. ロールアウトの再実行. The ReplicaSet data includes the number of desired replicas, the selector to identify which pods are being controlled, and the template for the pod. In summary, Controller reads the Deployment spec, forwards the pod configuration to ReplicaSet and then it creates the pods with. In the MongoDB spec section, the type of deployment was defined as ReplicaSet with the desired number of replicas of 3. Exposing the ReplicaSet. The main advantage of deployments is to automatically update your. Their sole purpose is to run container. The . It's mainly used by Deployment as a. 9) is a Kubernetes resource used to manage stateful applications. Let's understand the differences between Deployment, ReplicaSet, and Pod. To get the deployment used to generate a pod, have to look at the pod yaml or describe the pod: kubectl get pod -n {namespace} {pod-name} -o yaml Look for the "ownerReferences" section. Data Directory. For Deployment, ReplicaSet, Replication Controller, wait for the status value of ready_replicas to change to the number of replicas. Normally, the old (previous). Using a ReplicaSet: Non-Aware Application. Pods (and, by extension, containers) are, nevertheless, short-lived entities. What is a ReplicaSet?. Select the MongoDB version for your replica set. Note: a Deployment’s rollout is triggered if and only if the Deployment’s pod template (i. The relation between Deployment, Replicaset & POD. – 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. Lowering the replica count will cause Kubernetes to gracefully terminate. If you just have a Replicaset with one replica and no PodDisruptionBudget specified, the pod will be terminated and a new pod will be created on other nodes. This is the same result for another. » Prerequisites. updating the image:, it will manage the creation of a new ReplicaSet for you. This is different from vertical scaling, which for Kubernetes would. yaml. This lets you selectively delete groups of resources. 3. Choices: false. Entonces, continuó escalando el nuevo y el viejo ReplicaSet con la misma. Replication Controllers perform the same function as ReplicaSets, but Replication Controllers are old school. replicas field. To learn more about replica sets, see the Replication Introduction in the MongoDB manual. kubectl apply -f dp. spec. 1. Once your Pods have started, you can scale the StatefulSet up or down without risking the destruction of the MySQL primary node. 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. Deployments manage a ReplicaSet, e. (Remember, a controller in Kubernetes is what takes care of tasks to make sure the desired state of the cluster matches the observed state. Kuberneters – Difference Between Replicaset and Replication Controller. More precisely, a Deployment creates a ReplicaSet which then creates a set of identical, steteless, pods, w. Additionally, it's worth considering if you can use Deployment instead of directly using ReplicaSet. A ReplicaSet provides basic scaling mechanisms for pods, such as creating new pods if. Create credentials for the Kubernetes Operator or configure a different secret storage tool. Deployment provides you the capabilities to upgrade your applications smoothly using rolling updates, undo changes, pause, and resume changes as required. It is declarative and can be used for rolling updates of micro. The ReplicaSet creates Pods in the background. kind: Deployment name: php-apache minReplicas: 1 maxReplicas: 10 targetCPUUtilizationPercentage: 50. Like a ReplicaSet’s purpose is to maintain a stable set of replica Pods running at any given time. Kamu dapat mengawasi perkembangan Deployment dengan kubectl rollout status. Users do not have to manipulate replication controllers, replica sets, or pods owned by DeploymentConfig objects or deployments. The difference is in the arguments passed to the command. A ReplicaSet is a set of identical backup Pods maintained on the backend side to ensure a Pod is always available. I tried to update the Deployment and only the new ReplicaSet is updated. ReplicaSet. Whether you’re rolling an update or rollbacking one, using the deployment helps you handle Pod instances better. Vì vậy, ta nên sử dụng Deployment Container thay vì sử dụng trực tiếp ReplicaSet trừ khi ta có nhu cầu đặc biệt cần phối hợp. every Kubernetes object has its own requirements. replicas field. It also provides control when we have to. Create a Deployment to rollout a ReplicaSet. Tested the field as below. A deployment refers to a Kubernetes object that manages the performance and specifies the desired behavior of a pod. Note-: Giving each pod its own required identity makes the difference between stateful and deployment. Deployment では、全てのPodで1個のPV をマウントしている違いがあります. The deployment process for Deployments is driven by a controller loop, in contrast to DeploymentConfigs which use deployer pods for every new rollout. The Deployment creates a ReplicaSet that creates three replicated Pods, indicated by the . create a deployment. You can use the kind: deployment can check kubectl get rc still replica set will be there. You switched. Like a Deployment, a StatefulSet manages Pods that are based on an identical container spec. It is a higher-level abstraction built on top of ReplicaSets that uses ReplicaSets internally to. For a particular service. This manifest will define the desired state of the ReplicaSet, including the pod template for your application. Assume that you have a Deployment that spawns five Pod replicas. Inter-pod affinity and anti-affinity allow you to constrain which nodes your pod is eligible to be scheduled based on labels on pods that are already running on the node rather than based on labels on nodes. The ReplicaSet creates Pods in the background. This deployment of DCs is known as a replica set. So, for example if we need our ReplicaSet to manage all pods with the label role=webserver, the controller will search for any pod with that label. In this example, the label selected is nginx-appas defined in the pod template. Now, you need to upgrade one of. For any of the mentioned triggers, the Deployment controller will do a Deployment sync. 8 user guide shows how to create a deployment in. The major difference between a ReplicaSet and a Replication Controller right now is the. It manages the deployment and scaling of a set of Pods, and provides guarantee about the ordering and uniqueness of these Pods. selector. However, Deployment is a higher-level concept that manages ReplicaSets and provides declarative updates to Pods along with a lot of other useful features. spec. As Kubernetes continues its ascent as a leading container orchestration platform, it's common for users to encounter a perplexing choice between two prominent workload controllers: StatefulSets and Deployments. Note: we can ignore the service named kubernetes in the example above; that one already did exist before our kubectl run command. schedulerName field of the DaemonSet. ReplicaSet. Or just strip the name out to get the index at the end. spec. 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. Avoid complexity when possible, but let your application requirements dictate the architecture. Deployment sử dụng ReplicaSet để quản lý các Pod. This means that a. It deletes inginx-deploy Deployment object and also its associated Pod and ReplicaSet objects as shown in the below picture: Fig-8:- Delete inginx Deployment without cascade option. Create a deployment configuration. 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. Stateless applications are those that do not. 8. When we create a deployment it create a replica set and number of pods (that we gave in replicas ). If there are too many pods, it will kill some. Kubernetes Deployment vs. An ordinary Deployment or ReplicaSet could not implement this workflow. ReplicaSet then fulfills its purpose by creating and deleting Pods as needed to reach the desired number. The deployment will fetch a docker image hosting the required python runtime, and then attach a ConfigMap to the application Pod hosting the sample Python script shown earlier. g. You will almost never create this directly. yaml kubectl apply -f d. We’ve to use the –replicas option with this command to specify the new size. Get the replicaset list for the Deployment we just created. Deployment with name backend is created indicated by metadata. Avoid complexity when possible, but let your application requirements dictate the architecture. You’ll create a new Kubernetes secret for the new user, edit the custom resource of ReplicaSet deployment, and update the ReplicaSet to your.