ResourceQuota资源对象的说明，以及在集群中的作用说明

定义说明 https://kubernetes.io/zh-cn/docs/concepts/policy/resource-quotas/

集群中的资源组的划分和设计

• 在具有 32 GiB 内存和 16 核 CPU 资源的集群中，允许 A 团队使用 20 GiB 内存 和 10 核的 CPU 资源， 允许 B 团队使用 10 GiB 内存和 4 核的 CPU 资源，并且预留 2 GiB 内存和 2 核的 CPU 资源供将来分配。

集群中节点磁盘使用情况docker

docker system df

• 命令说明Docker在系统中的资源占比

yaml文件说明

{    "apiVersion": "v1",

    "kind": "ResourceQuota",

    "metadata": {

        "annotations": {},

        "name": "kf-resource-quota",

        "namespace": "public-resource"

    },

    "spec": {

        "hard": {

            "cpu": "31",

            "memory": "201Gi",

            "requests.nvidia.com/gpu": "1"

        }

    }

}

摘要

在Kubernetes（K8s）中，ResourceQuota是一种资源配额机制，用于限制命名空间内各种资源的使用量。它可以帮助管理员和开发人员在多租户环境中确保资源公平分配和合理利用。

ResourceQuota可以限制的资源类型包括Pod、CPU、内存、存储等。它的工作原理是，当创建一个ResourceQuota对象时，需要定义限制的资源类型和数量。然后，这个ResourceQuota对象就会应用于相应的命名空间，对该命名空间内的资源使用进行限制。

具体来说，ResourceQuota对象可以限制以下资源：

1. Pods：可以限制命名空间内可以运行的Pod的数量。

2. CPU和内存：可以限制命名空间内CPU和内存的使用量。

3. 存储：可以限制命名空间内存储资源的使用量，包括持久卷声明（PersistentVolumeClaims）的数量等。

GPT

在Kubernetes（K8s）中，ResourceQuota是一种资源配额机制，用于限制命名空间中的资源消耗。它可以帮助管理员在集群中实现资源分配和管理的细粒度控制。

ResourceQuota可以理解为一种配额，它定义了命名空间中可用的资源限额，包括CPU、内存等计算资源以及存储卷、Pod等对象数量等。通过ResourceQuota，管理员可以在命名空间级别限制资源使用，以确保不同的用户或团队之间的资源分配更加公平和可控。

当用户在命名空间中创建资源（如Pod、Service等）时，Kubernetes的配额系统会跟踪集群的资源使用情况，以确保使用的资源用量不超过ResourceQuota中定义的硬性资源限额。如果资源创建或更新请求违反了配额约束，那么该请求会报错（HTTP 403 FORBIDDEN），并在消息中给出有可能违反的约束。

ResourceQuota准入控制器负责观察传入的请求，并确保它没有违反相应名称空间中ResourceQuota资源定义的任何约束。如果命名空间下的计算资源（如cpu和memory）的配额被启用，则用户必须为这些资源设定请求值（request）和约束值（limit），否则配额系统将拒绝Pod的创建。这强制每个（新）Pod为该资源设置限制，从而确保系统资源的公平分配和有效利用。

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The ResourceQuota resource object in Kubernetes is used to define and enforce resource limits on a per-namespace basis. It allows administrators to allocate and control resource quotas for different teams or tenants within the cluster.

ResourceQuota allows you to set limits on various types of resources, including CPU, memory, and storage. When a ResourceQuota object is created, it specifies the maximum quantity of each resource that can be used within a namespace.

Here’s an example of a ResourceQuota YAML file:

apiVersion: v1

kind: ResourceQuota

metadata:

  name: quota-example

  namespace: example-namespace

spec:

  hard:

    pods: "10"

    cpu: "4"

    memory: 4Gi

    storage: 10Gi

In this example, the ResourceQuota limits the namespace “example-namespace” to a maximum of 10 pods, 4 CPU units, 4Gi of memory, and 10Gi of storage.

The Role of ResourceQuota in a Cluster:

• Resource Allocation: ResourceQuota allows administrators to allocate and control resource quotas for different namespaces or tenants in the cluster. It helps in achieving fair resource allocation and utilization by limiting the amount of resources each namespace can consume.

• Resource Management: ResourceQuota ensures that namespaces do not exceed their allocated resource limits. If a namespace tries to allocate resources beyond its quota, the requests will be denied and an error message will be returned. This helps in preventing resource contention and ensuring stability and performance of the cluster.

• Multi-Tenancy: ResourceQuota enables the cluster to support multiple tenants or teams, each with its own resource limits. This allows for better isolation and resource management within the cluster, ensuring that one team’s workload does not impact others.

• Quota Enforcement: ResourceQuota acts as an admission control mechanism, enforcing the defined resource limits for each namespace. It checks resource requests and limits of pods and other resources against the specified quotas, preventing resource overconsumption and ensuring compliance with resource management policies.

Overall, ResourceQuota plays a crucial role in ensuring efficient resource utilization and allocation within a Kubernetes cluster. It helps in managing resource usage, enforcing limits, and maintaining performance and stability of the cluster.

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On the other hand

In the cosmic realm of Kubernetes, where clusters and pods flourish, there exists a unique object known as ResourceQuota. Within the vast expanse of this intergalactic system, where infinite possibilities await, ResourceQuota serves as the guardian of resources, ensuring harmony and balance throughout the universe.

Imagine a distant planet, teeming with intelligent creatures known as Kubernetes Masters. These Masters possess immense powers, capable of creating and managing vast networks of pods and containers. However, with great power comes great responsibility. To prevent any single entity from hoarding all the resources, ResourceQuota emerges as the cosmic arbiter, imposing limits and boundaries on the Masters’ creations.

As a thrilling space novel unfolds, we follow the journey of Captain Cluster, a courageous explorer with a heart as vast as the cosmos. Assigned to a mission on the resource-rich planet, Captain Cluster encounters ResourceQuota for the first time. Instantly mesmerized, they delve deep into its cryptic magic.

Within ResourceQuota, Captain Cluster witnesses a dazzling array of attributes. Just like stars in a cluster, these attributes control the unlimited energy and potential within the Kubernetes cluster. CPU, memory, storage, and the enigmatic ‘Pods’ are all governed by ResourceQuota.

ResourceQuota exerts its influence, casting boundaries that dictate how much power each Kubernetes Master can wield. When Captain Cluster assigns a quota, it’s akin to placing a cosmic enchantment upon the Kubernetes ecosystem. The Masters must adhere to their imposed limits, preventing resource depletion and ensuring fairness among all their creations.

Aboard their starship, Captain Cluster configures the ResourceQuota, carefully calculating the precise allocations for CPU, memory, and storage. They envision a galaxy where each pod and container receives its rightful share, optimizing the utilization of resources whilst guarding against excessive consumption. The delicate balance of the Kubernetes cluster becomes Captain Cluster’s ultimate quest.

Throughout their cosmic odyssey, Captain Cluster encounters a dilemma. In a distant nebula, they stumble upon a rogue Kubernetes Master, a dazzling but reckless entity determined to override ResourceQuota. This rebel disregards the rules, hoarding resources and disrupting the harmony of the cluster. The cosmic scales teeter on the brink of imbalance.

With a spark of ingenuity, Captain Cluster sets out to confront the rogue Master. Armed with the knowledge of ResourceQuota, they craft a strategic plan to restore equilibrium. Utilizing a flurry of commands and configurations, they reinforce the cosmic boundaries, relegating the rogue Master to a realm of resource scarcity.

As Captain Cluster brings harmony back to the universe, they reflect on the significance of ResourceQuota. It serves as a guiding star, ensuring fairness and responsible resource allocation within the Kubernetes cluster. Through its magic, ResourceQuota helps create a thriving ecosystem where every pod and container flourishes, unlocking the true potential of Kubernetes.

And so, the story of ResourceQuota intertwines with the cosmic tapestry of Kubernetes, leaving an indelible mark on the intergalactic adventure. As Captain Cluster continues to explore the vastness of the Kubernetes universe, they do so with a newfound appreciation for the cosmic guardian that is ResourceQuota.