From 8d2fe94af9d5d8c448b1d322a9ce1fb6cf663d80 Mon Sep 17 00:00:00 2001
From: MJ-CJM <43091605+MJ-CJM@users.noreply.github.com>
Date: Sun, 14 Jul 2019 11:03:03 +0800
Subject: [PATCH] . (#15400)

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+---
+reviewers:
+- luxas
+- thockin
+- wlan0
+title: Kubernetes 云管理控制器
+content_template: templates/concept
+---
+<!--
+---
+reviewers:
+- luxas
+- thockin
+- wlan0
+title: Kubernetes Cloud Controller Manager
+content_template: templates/concept
+---
+-->
+
+{{% capture overview %}}
+
+{{< feature-state state="beta" >}}
+<!--
+Kubernetes v1.6 introduced a new binary called `cloud-controller-manager`. `cloud-controller-manager` is a daemon that embeds cloud-specific control loops. These cloud-specific control loops were originally in the `kube-controller-manager`. Since cloud providers develop and release at a different pace compared to the Kubernetes project, abstracting the provider-specific code to the `cloud-controller-manager` binary allows cloud vendors to evolve independently from the core Kubernetes code.
+
+The `cloud-controller-manager` can be linked to any cloud provider that satisfies [cloudprovider.Interface](https://github.com/kubernetes/cloud-provider/blob/master/cloud.go). For backwards compatibility, the [cloud-controller-manager](https://github.com/kubernetes/kubernetes/tree/master/cmd/cloud-controller-manager) provided in the core Kubernetes project uses the same cloud libraries as `kube-controller-manager`. Cloud providers already supported in Kubernetes core are expected to use the in-tree cloud-controller-manager to transition out of Kubernetes core. In future Kubernetes releases, all cloud controller managers will be developed outside of the core Kubernetes project managed by sig leads or cloud vendors.
+-->
+Kubernetes v1.6 包含一个新的二进制文件，叫做 `cloud-controller-manager`。`cloud-controller-manager` 是一个嵌入了特定云服务控制循环逻辑的守护进程。这些特定云服务控制循环逻辑最初存在于 `kube-controller-manager` 中。由于云服务提供商开发和发布的速度与 Kubernetes 项目不同，将服务提供商专用代码从 `cloud-controller-manager` 二进制中抽象出来有助于云服务厂商在 Kubernetes 核心代码之外独立进行开发。
+
+`cloud-controller-manager` 可以被链接到任何满足 [cloudprovider.Interface](https://github.com/kubernetes/cloud-provider/blob/master/cloud.go) 约束的云服务提供商。为了兼容旧版本，Kubernetes 核心项目中提供的 [cloud-controller-manager](https://github.com/kubernetes/kubernetes/tree/master/cmd/cloud-controller-manager) 使用和 `kube-controller-manager` 相同的云服务类库。已经在 Kubernetes 核心项目中支持的云服务提供商预计将通过使用 in-tree 的 cloud-controller-manager 过渡到 Kubernetes 核心之外。在将来的 Kubernetes 发布中，所有的云管理控制器将在 Kubernetes 核心项目之外，由 sig 领导者或者云服务厂商进行开发。 
+
+{{% /capture %}}
+
+
+{{% capture body %}}
+
+<!--
+## Administration
+
+### Requirements
+
+Every cloud has their own set of requirements for running their own cloud provider integration, it should not be too different from the requirements when running `kube-controller-manager`. As a general rule of thumb you'll need:
+
+* cloud authentication/authorization: your cloud may require a token or IAM rules to allow access to their APIs
+* kubernetes authentication/authorization: cloud-controller-manager may need RBAC rules set to speak to the kubernetes apiserver
+* high availability: like kube-controller-manager, you may want a high available setup for cloud controller manager using leader election (on by default).
+-->
+## 管理
+
+### 需求
+
+每个云服务都有一套各自的需求用于系统平台的集成，这不应与运行 `kube-controller-manager` 的需求有太大差异。作为经验法则，你需要：
+
+* 云服务认证 / 授权：您的云服务可能需要使用令牌或者 IAM 规则以允许对其 API 的访问
+* kubernetes 认证 / 授权：cloud-controller-manager 可能需要 RBAC 规则以访问 kubernetes apiserver
+* 高可用：类似于 kube-controller-manager，您可能希望通过主节点选举（默认开启）配置一个高可用的云管理控制器。
+
+<!--
+### Running cloud-controller-manager
+
+Successfully running cloud-controller-manager requires some changes to your cluster configuration.
+
+* `kube-apiserver` and `kube-controller-manager` MUST NOT specify the `--cloud-provider` flag. This ensures that it does not run any cloud specific loops that would be run by cloud controller manager. In the future, this flag will be deprecated and removed.
+* `kubelet` must run with `--cloud-provider=external`. This is to ensure that the kubelet is aware that it must be initialized by the cloud controller manager before it is scheduled any work.
+
+Keep in mind that setting up your cluster to use cloud controller manager will change your cluster behaviour in a few ways:
+
+* kubelets specifying `--cloud-provider=external` will add a taint `node.cloudprovider.kubernetes.io/uninitialized` with an effect `NoSchedule` during initialization. This marks the node as needing a second initialization from an external controller before it can be scheduled work. Note that in the event that cloud controller manager is not available, new nodes in the cluster will be left unschedulable. The taint is important since the scheduler may require cloud specific information about nodes such as their region or type (high cpu, gpu, high memory, spot instance, etc).
+* cloud information about nodes in the cluster will no longer be retrieved using local metadata, but instead all API calls to retrieve node information will go through cloud controller manager. This may mean you can restrict access to your cloud API on the kubelets for better security. For larger clusters you may want to consider if cloud controller manager will hit rate limits since it is now responsible for almost all API calls to your cloud from within the cluster.
+
+
+As of v1.8, cloud controller manager can implement:
+
+* node controller - responsible for updating kubernetes nodes using cloud APIs and deleting kubernetes nodes that were deleted on your cloud.
+* service controller - responsible for loadbalancers on your cloud against services of type LoadBalancer.
+* route controller - responsible for setting up network routes on your cloud
+* any other features you would like to implement if you are running an out-of-tree provider.
+-->
+### 运行云管理控制器
+
+您需要对集群配置做适当的修改以成功地运行云管理控制器：
+
+* 一定不要为 `kube-apiserver` 和 `kube-controller-manager` 指定 `--cloud-provider` 标志。这将保证它们不会运行任何云服务专用循环逻辑，这将会由云管理控制器运行。未来这个标记将被废弃并去除。
+* `kubelet` 必须使用 `--cloud-provider=external` 运行。这是为了保证让 kubelet 知道在执行任何任务前，它必须被云管理控制器初始化。
+
+请记住，设置群集使用云管理控制器将用多种方式更改群集行为：
+
+* 指定了 `--cloud-provider=external` 的 kubelet 将被添加一个 `node.cloudprovider.kubernetes.io/uninitialized` 的污点，导致其在初始化过程中不可调度（`NoSchedule`）。这将标记该节点在能够正常调度前，需要外部的控制器进行二次初始化。请注意，如果云管理控制器不可用，集群中的新节点会一直处于不可调度的状态。这个污点很重要，因为调度器可能需要关于节点的云服务特定的信息，比如他们的区域或类型（high cpu, gpu, high memory, spot instance 等）。
+* 集群中节点的云服务信息将不再能够从本地元数据中获取，取而代之的是所有获取节点信息的 API 调用都将通过云管理控制器。这意味着你可以通过限制到 kubelet 云服务 API 的访问来提升安全性。在更大的集群中您可能需要考虑云管理控制器是否会遇到速率限制，因为它现在负责集群中几乎所有到云服务的 API 调用。
+
+
+对于 v1.8 版本，云管理控制器可以实现：
+
+* node 控制器 - 负责使用云服务 API 更新 kubernetes 节点并删除在云服务上已经删除的 kubernetes 节点。
+* service 控制器 - 负责在云服务上为类型为 LoadBalancer 的 service 提供负载均衡器。
+* route 控制器 - 负责在云服务上配置网络路由。
+* 如果您使用的是 out-of-tree 提供商，请按需实现其余任意特性。
+
+<!--
+## Examples
+
+If you are using a cloud that is currently supported in Kubernetes core and would like to adopt cloud controller manager, see the [cloud controller manager in kubernetes core](https://github.com/kubernetes/kubernetes/tree/master/cmd/cloud-controller-manager).
+
+For cloud controller managers not in Kubernetes core, you can find the respective projects in repos maintained by cloud vendors or sig leads.
+
+* [DigitalOcean](https://github.com/digitalocean/digitalocean-cloud-controller-manager)
+* [keepalived](https://github.com/munnerz/keepalived-cloud-provider)
+* [Oracle Cloud Infrastructure](https://github.com/oracle/oci-cloud-controller-manager)
+* [Rancher](https://github.com/rancher/rancher-cloud-controller-manager)
+
+For providers already in Kubernetes core, you can run the in-tree cloud controller manager as a Daemonset in your cluster, use the following as a guideline:
+
+{{< codenew file="admin/cloud/ccm-example.yaml" >}}
+-->
+## 示例
+
+如果当前 Kubernetes 内核支持您使用的云服务，并且想要采用云管理控制器，请参见 [kubernetes 内核中的云管理控制器](https://github.com/kubernetes/kubernetes/tree/master/cmd/cloud-controller-manager)。
+
+对于不在 Kubernetes 内核中的云管理控制器，您可以在云服务厂商或 sig 领导者的源中找到对应的项目。
+
+* [DigitalOcean](https://github.com/digitalocean/digitalocean-cloud-controller-manager)
+* [keepalived](https://github.com/munnerz/keepalived-cloud-provider)
+* [Oracle Cloud Infrastructure](https://github.com/oracle/oci-cloud-controller-manager)
+* [Rancher](https://github.com/rancher/rancher-cloud-controller-manager)
+
+对于已经存在于 Kubernetes 内核中的提供商，您可以在集群中将 in-tree 云管理控制器作为守护进程运行。请使用如下指南：
+
+{{< codenew file="admin/cloud/ccm-example.yaml" >}}
+
+<!--
+## Limitations
+
+Running cloud controller manager comes with a few possible limitations. Although these limitations are being addressed in upcoming releases, it's important that you are aware of these limitations for production workloads.
+
+### Support for Volumes
+
+Cloud controller manager does not implement any of the volume controllers found in `kube-controller-manager` as the volume integrations also require coordination with kubelets. As we evolve CSI (container storage interface) and add stronger support for flex volume plugins, necessary support will be added to cloud controller manager so that clouds can fully integrate with volumes. Learn more about out-of-tree CSI volume plugins [here](https://github.com/kubernetes/features/issues/178).
+
+### Scalability
+
+In the previous architecture for cloud providers, we relied on kubelets using a local metadata service to retrieve node information about itself. With this new architecture, we now fully rely on the cloud controller managers to retrieve information for all nodes. For very larger clusters, you should consider possible bottle necks such as resource requirements and API rate limiting.
+-->
+## 限制
+
+运行云管理控制器会有一些可能的限制。虽然以后的版本将处理这些限制，但是知道这些生产负载的限制很重要。
+
+### 对 Volume 的支持
+
+云管理控制器未实现 `kube-controller-manager` 中的任何 volume 控制器，因为和 volume 的集成还需要与 kubelet 协作。由于我们引入了 CSI (容器存储接口，container storage interface) 并对弹性 volume 插件添加了更强大的支持，云管理控制器将添加必要的支持，以使云服务同 volume 更好的集成。请在 [这里](https://github.com/kubernetes/features/issues/178) 了解更多关于 out-of-tree CSI volume 插件的信息。
+
+### 可扩展性
+
+在以前为云服务提供商提供的架构中，我们依赖 kubelet 的本地元数据服务来获取关于它本身的节点信息。通过这个新的架构，现在我们完全依赖云管理控制器来获取所有节点的信息。对于非常大的集群，您需要考虑可能的瓶颈，例如资源需求和 API 速率限制。
+
+<!--
+### Chicken and Egg
+
+The goal of the cloud controller manager project is to decouple development of cloud features from the core Kubernetes project. Unfortunately, many aspects of the Kubernetes project has assumptions that cloud provider features are tightly integrated into the project. As a result, adopting this new architecture can create several situations where a request is being made for information from a cloud provider, but the cloud controller manager may not be able to return that information without the original request being complete.
+
+A good example of this is the TLS bootstrapping feature in the Kubelet. Currently, TLS bootstrapping assumes that the Kubelet has the ability to ask the cloud provider (or a local metadata service) for all its address types (private, public, etc) but cloud controller manager cannot set a node's address types without being initialized in the first place which requires that the kubelet has TLS certificates to communicate with the apiserver.
+
+As this initiative evolves, changes will be made to address these issues in upcoming releases.
+
+## Developing your own Cloud Controller Manager
+
+To build and develop your own cloud controller manager, read the [Developing Cloud Controller Manager](/docs/tasks/administer-cluster/developing-cloud-controller-manager.md) doc.
+-->
+### 鸡和蛋的问题
+
+云管理控制器的目标是将云服务特性的开发从 Kubernetes 核心项目中解耦。不幸的是，Kubernetes 项目的许多方面都假设云服务提供商的特性同项目紧密结合。因此，这种新架构的采用可能导致某些场景下，当一个请求需要从云服务提供商获取信息时，在该请求没有完成的情况下云管理控制器不能返回那些信息。
+
+Kubelet 中的 TLS 引导特性是一个很好的例子。目前，TLS 引导认为 Kubelet 有能力从云提供商（或本地元数据服务）获取所有的地址类型（私有、公用等），但在被初始化之前，云管理控制器不能设置节点地址类型，而这需要 kubelet 拥有 TLS 证书以和 apiserver 通信。
+
+随着这种措施的演进，将来的发行版中将作出改变来解决这些问题。
+
+## 开发自己的云管理控制器
+
+要构建和开发您自己的云管理控制器，请阅读 [开发云管理控制器](/docs/tasks/administer-cluster/developing-cloud-controller-manager.md) 文档。
+
+{{% /capture %}}
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