The inner components of Kubernetes.
Related to Kubernetes open-source development.
A resource type that Kubernetes supports by default.
Supported customizations of Kubernetes.
Relevant for a first-time user of Kubernetes.
How Kubernetes components talk to each other (and to programs outside the cluster).
Starting and maintaining Kubernetes.
Keeping Kubernetes applications safe and secure.
How Kubernetes applications handle persistent data.
Software that makes Kubernetes easier or better to use.
Represents a common type of Kubernetes user.
Applications running on Kubernetes.
Architecture Community Core Object Extension Fundamental Networking Operation Security Storage Tool User Type Workload すべてを選択 すべての選択を解除

Click on the [+] 特定の用語の詳細な説明を取得するには、以下のインジケータを使用します。

  • Add-ons




  • APIサーバー
    またの名を: kube-apiserver

    APIサーバーは、Kubernetes APIを外部に提供するKubernetesコントロールプレーンのコンポーネントです。 APIサーバーはKubernetesコントロールプレーンのフロントエンドになります。


    Kubernetes APIサーバーの主な実装はkube-apiserverです。 kube-apiserverは水平方向にスケールするように設計されています—つまり、インスタンスを追加することでスケールが可能です。 複数のkube-apiserverインスタンスを実行することで、インスタンス間でトラフィックを分散させることが可能です。

  • APIグループ

    Kubernetes APIの関連するパスのセット。


    APIサーバーの構成を変更することで、各APIグループを有効または無効にできます。特定のリソースへのパスを無効または有効にすることもできます。APIグループを使用すると、Kubernetes APIを簡単に拡張できます。APIグループは、RESTパスとシリアル化されたオブジェクトのapiVersionフィールドで指定されます。

  • APIを起点とした退避

    APIを起点とした退避は、Eviction APIを使用して退避オブジェクトを作成し、Podの正常終了を起動させるプロセスです。


    kubectl drainコマンドのようなkube-apiserverのクライアントを使用し、Eviction APIを直接呼び出すことで、退避を要求することができます。Evictionオブジェクトが生成された時、APIサーバーは対象のPodを終了させます。



  • Appコンテナ



    Initコンテナを使用すると、ワークロード全体にとって重要であり、アプリケーションコンテナの開始後に実行し続ける必要のない初期化の詳細を分離できます。 PodにInitコンテナが構成されていない場合、そのPod内のすべてのコンテナはAppコンテナになります。

  • cAdvisor

    cAdvisor (Container Advisor) provides container users an understanding of the resource usage and performance characteristics of their running containers.


    It is a running daemon that collects, aggregates, processes, and exports information about running containers. Specifically, for each container it keeps resource isolation parameters, historical resource usage, histograms of complete historical resource usage and network statistics. This data is exported by container and machine-wide.

  • Certificate

    A cryptographically secure file used to validate access to the Kubernetes cluster.


    Certificates enable applications within a Kubernetes cluster to access the Kubernetes API securely. Certificates validate that clients are allowed to access the API.

  • cgroup (control group)




  • CIDR

    CIDR (Classless Inter-Domain Routing) is a notation for describing blocks of IP addresses and is used heavily in various networking configurations.


    In the context of Kubernetes, each Node is assigned a range of IP addresses through the start address and a subnet mask using CIDR. This allows Nodes to assign each Pod a unique IP address. Although originally a concept for IPv4, CIDR has also been expanded to include IPv6.

  • CLA (Contributor License Agreement)

    Terms under which a contributor grants a license to an open source project for their contributions.


    CLAs help resolve legal disputes involving contributed material and intellectual property (IP).

  • Cloud Native Computing Foundation (CNCF)

    Cloud Native Computing Foundation (CNCF)は、持続可能なエコシステムを構築し、マイクロサービスアーキテクチャの一部としてコンテナをオーケストレーションするプロジェクトを中心としたコミュニティを育成します。



    CNCFはLinux Foundationのサブファウンデーションです。 CNCFの使命は、クラウドネイティブコンピューティングをユビキタスにすることです。

  • Cloud Provider
    またの名を: Cloud Service Provider

    A business or other organization that offers a cloud computing platform.


    Cloud providers, sometimes called Cloud Service Providers (CSPs), offer cloud computing platforms or services.

    Many cloud providers offer managed infrastructure (also called Infrastructure as a Service or IaaS). With managed infrastructure the cloud provider is responsible for servers, storage, and networking while you manage layers on top of that such as running a Kubernetes cluster.

    You can also find Kubernetes as a managed service; sometimes called Platform as a Service, or PaaS. With managed Kubernetes, your cloud provider is responsible for the Kubernetes control plane as well as the nodes and the infrastructure they rely on: networking, storage, and possibly other elements such as load balancers.

  • Cluster Architect

    A person who designs infrastructure that involves one or more Kubernetes clusters.


    Cluster architects are concerned with best practices for distributed systems, for example: high availability and security.

  • Cluster Infrastructure
    The infrastructure layer provides and maintains VMs, networking, security groups and others. [+]

    The infrastructure layer provides and maintains VMs, networking, security groups and others.

  • Cluster Operations

    The work involved in managing a Kubernetes cluster: managing day-to-day operations, and co-ordinating upgrades.


    Examples of cluster operations work include: deploying new Nodes to scale the cluster; performing software upgrades; implementing security controls; adding or removing storage; configuring cluster networking; managing cluster-wide observability; and responding to events.

  • Code Contributor

    A person who develops and contributes code to the Kubernetes open source codebase.


    They are also an active community member who participates in one or more Special Interest Groups (SIGs).

  • ConfigMap




  • Container Environment Variables

    Container environment variables are name=value pairs that provide useful information into containers running in a pod


    Container environment variables provide information that is required by the running containerized applications along with information about important resources to the containers. For example, file system details, information about the container itself, and other cluster resources such as service endpoints.

  • Container Lifecycle Hooks

    The lifecycle hooks expose events in the Container management lifecycle and let the user run code when the events occur.


    Two hooks are exposed to Containers: PostStart which executes immediately after a container is created and PreStop which is blocking and is called immediately before a container is terminated.

  • Container network interface (CNI)

    Container network interface (CNI) plugins are a type of Network plugin that adheres to the appc/CNI specification.

  • Container Runtime Interface

    The main protocol for the communication between the kubelet and Container Runtime.


    The Kubernetes Container Runtime Interface (CRI) defines the main gRPC protocol for the communication between the node components kubelet and container runtime.

  • Container runtime interface (CRI)

    The container runtime interface (CRI) is an API for container runtimes to integrate with the kubelet on a node.


    For more information, see the CRI API and specifications.

  • containerd

    A container runtime with an emphasis on simplicity, robustness and portability


    containerd is a container runtime that runs as a daemon on Linux or Windows. containerd takes care of fetching and storing container images, executing containers, providing network access, and more.

  • Controller




    コントロールプレーン内部で動くいくつかのコントローラーは、Kubernetesの主要な操作に対する制御ループを提供します。 例えば、Deploymentコントローラー、Daemonsetコントローラー、Namespaceコントローラー、Persistent Volumeコントローラー等はkube-controller-managerの内部で動作します。

  • CRI-O

    A tool that lets you use OCI container runtimes with Kubernetes CRI.


    CRI-O is an implementation of the Container runtime interface (CRI) to enable using container runtimes that are compatible with the Open Container Initiative (OCI) runtime spec.

    Deploying CRI-O allows Kubernetes to use any OCI-compliant runtime as the container runtime for running Pods, and to fetch OCI container images from remote registries.

  • CronJob

    Manages a Job that runs on a periodic schedule.


    Similar to a line in a crontab file, a CronJob object specifies a schedule using the cron format.

  • CustomResourceDefinition

    Custom code that defines a resource to add to your Kubernetes API server without building a complete custom server.


    Custom Resource Definitions let you extend the Kubernetes API for your environment if the publicly supported API resources can't meet your needs.

  • DaemonSet




  • Data Plane
    The layer that provides capacity such as CPU, memory, network, and storage so that the containers can run and connect to a network. [+]

    The layer that provides capacity such as CPU, memory, network, and storage so that the containers can run and connect to a network.

  • Deployment



    各レプリカはPodで表され、Podはクラスターのノード間で分散されます。 ローカル状態を要求するワークロードには、StatefulSetの利用を考えてください。

  • Developer (disambiguation)

    May refer to: Application Developer, Code Contributor, or Platform Developer.


    This overloaded term may have different meanings depending on the context

  • Device Plugin

    Device plugins run on worker Nodes and provide Pods with access to resources, such as local hardware, that require vendor-specific initialization or setup steps.


    Device plugins advertise resources to the kubelet, so that workload Pods can access hardware features that relate to the Node where that Pod is running. You can deploy a device plugin as a DaemonSet, or install the device plugin software directly on each target Node.

    See Device Plugins for more information.

  • Disruption

    Disruptions are events that lead to one or more Pods going out of service. A disruption has consequences for workload resources, such as Deployment, that rely on the affected Pods.


    If you, as cluster operator, destroy a Pod that belongs to an application, Kubernetes terms that a voluntary disruption. If a Pod goes offline because of a Node failure, or an outage affecting a wider failure zone, Kubernetes terms that an involuntary disruption.

    See Disruptions for more information.

  • Docker

    Docker(正確にはDocker Engine)は、コンテナとしても知られる、オペレーティングシステムレベルでの仮想化を提供するソフトウェア技術です。



  • Dockershim

    The dockershim is a component of Kubernetes version 1.23 and earlier. It allows the kubelet to communicate with Docker Engine.


    Starting with version 1.24, dockershim has been removed from Kubernetes. For more information, see Dockershim FAQ.

  • Downstream (disambiguation)

    May refer to: code in the Kubernetes ecosystem that depends upon the core Kubernetes codebase or a forked repo.

    • In the Kubernetes Community: Conversations often use downstream to mean the ecosystem, code, or third-party tools that rely on the core Kubernetes codebase. For example, a new feature in Kubernetes may be adopted by applications downstream to improve their functionality.
    • In GitHub or git: The convention is to refer to a forked repo as downstream, whereas the source repo is considered upstream.
  • Downward API

    Kubernetes' mechanism to expose Pod and container field values to code running in a container.


    It is sometimes useful for a container to have information about itself, without needing to make changes to the container code that directly couple it to Kubernetes.

    The Kubernetes downward API allows containers to consume information about themselves or their context in a Kubernetes cluster. Applications in containers can have access to that information, without the application needing to act as a client of the Kubernetes API.

    There are two ways to expose Pod and container fields to a running container:

    Together, these two ways of exposing Pod and container fields are called the downward API.

  • Dynamic Volume Provisioning

    Allows users to request automatic creation of storage Volumes.


    Dynamic provisioning eliminates the need for cluster administrators to pre-provision storage. Instead, it automatically provisions storage by user request. Dynamic volume provisioning is based on an API object, StorageClass, referring to a Volume Plugin that provisions a Volume and the set of parameters to pass to the Volume Plugin.

  • Endpoints

    Endpoints track the IP addresses of Pods with matching selectors.


    Endpoints can be configured manually for Services without selectors specified. The EndpointSlice resource provides a scalable and extensible alternative to Endpoints.

  • EndpointSlice

    A way to group network endpoints together with Kubernetes resources.


    A scalable and extensible way to group network endpoints together. These can be used by kube-proxy to establish network routes on each node.

  • Ephemeral Container

    A Container type that you can temporarily run inside a Pod.


    If you want to investigate a Pod that's running with problems, you can add an ephemeral container to that Pod and carry out diagnostics. Ephemeral containers have no resource or scheduling guarantees, and you should not use them to run any part of the workload itself.

    Ephemeral containers are not supported by static pods.

  • etcd





  • Event

    Event is a Kubernetes object that describes state change/notable occurrences in the system.


    Events have a limited retention time and triggers and messages may evolve with time. Event consumers should not rely on the timing of an event with a given reason reflecting a consistent underlying trigger, or the continued existence of events with that reason.

    Events should be treated as informative, best-effort, supplemental data.

    In Kubernetes, auditing generates a different kind of Event record (API group audit.k8s.io).

  • Eviction

    Eviction is the process of terminating one or more Pods on Nodes.


    There are two kinds of eviction:

  • Extensions

    Extensions are software components that extend and deeply integrate with Kubernetes to support new types of hardware.


    Many cluster administrators use a hosted or distribution instance of Kubernetes. These clusters come with extensions pre-installed. As a result, most Kubernetes users will not need to install extensions and even fewer users will need to author new ones.

  • Feature gate

    Feature gates are a set of keys (opaque string values) that you can use to control which Kubernetes features are enabled in your cluster.


    You can turn these features on or off using the --feature-gates command line flag on each Kubernetes component. Each Kubernetes component lets you enable or disable a set of feature gates that are relevant to that component. The Kubernetes documentation lists all current feature gates and what they control.

  • FlexVolume

    FlexVolume is a deprecated interface for creating out-of-tree volume plugins. The Container Storage Interface is a newer interface that addresses several problems with FlexVolume.


    FlexVolumes enable users to write their own drivers and add support for their volumes in Kubernetes. FlexVolume driver binaries and dependencies must be installed on host machines. This requires root access. The Storage SIG suggests implementing a CSI driver if possible since it addresses the limitations with FlexVolumes.

  • Gateway API

    A family of API kinds for modeling service networking in Kubernetes.


    Gateway API provides a family of extensible, role-oriented, protocol-aware API kinds for modeling service networking in Kubernetes.

  • Group Version Resource
    またの名を: GVR

    Means of representing unique Kubernetes API resource.


    Group Version Resources (GVRs) specify the API group, API version, and resource (name for the object kind as it appears in the URI) associated with accessing a particular id of object in Kubernetes. GVRs let you define and distinguish different Kubernetes objects, and to specify a way of accessing objects that is stable even as APIs change.

  • Helmチャート



    チャートは、Kubernetesアプリケーションを作成および共有する再現可能な方法を提供します。 単一のチャートを使用して、memcached Podなどの単純なもの、またはHTTPサーバー、データベース、キャッシュなどを含む完全なWebアプリスタックなどの複雑なものをデプロイできます。

  • Horizontal Pod Autoscaler
    またの名を: HPA

    An API resource that automatically scales the number of Pod replicas based on targeted CPU utilization or custom metric targets.


    HPA is typically used with ReplicationControllers, Deployments, or ReplicaSets. It cannot be applied to objects that cannot be scaled, for example DaemonSets.

  • HostAliases

    A HostAliases is a mapping between the IP address and hostname to be injected into a Pod's hosts file.


    HostAliases is an optional list of hostnames and IP addresses that will be injected into the Pod's hosts file if specified. This is only valid for non-hostNetwork Pods.

  • Ingress




  • Init Container

    One or more initialization containers that must run to completion before any app containers run.


    Initialization (init) containers are like regular app containers, with one difference: init containers must run to completion before any app containers can start. Init containers run in series: each init container must run to completion before the next init container begins.

    Unlike sidecar containers, init containers do not remain running after Pod startup.

    For more information, read init containers.

  • Istio




  • Job

    A finite or batch task that runs to completion.


    Creates one or more Pod objects and ensures that a specified number of them successfully terminate. As Pods successfully complete, the Job tracks the successful completions.

  • JSON Web Token (JWT)

    A means of representing claims to be transferred between two parties.


    JWTs can be digitally signed and encrypted. Kubernetes uses JWTs as authentication tokens to verify the identity of entities that want to perform actions in a cluster.

  • kOps (Kubernetes Operations)

    kOps will not only help you create, destroy, upgrade and maintain production-grade, highly available, Kubernetes cluster, but it will also provision the necessary cloud infrastructure.


    kOps is an automated provisioning system:

    • Fully automated installation
    • Uses DNS to identify clusters
    • Self-healing: everything runs in Auto-Scaling Groups
    • Multiple OS support (Amazon Linux, Debian, Flatcar, RHEL, Rocky and Ubuntu)
    • High-Availability support
    • Can directly provision, or generate terraform manifests
  • kube-controller-manager




  • kube-proxy





  • kube-scheduler




  • Kubeadm




  • Kubectl
    またの名を: kubectl

    Kubernetes APIを使用してKubernetesクラスターのコントロールプレーンと通信するためのコマンドラインツールです。


    Kubernetesオブジェクトの作成、検査、更新、削除には kubectl を使用することができます。

  • Kubelet




  • Kubernetes API

    The application that serves Kubernetes functionality through a RESTful interface and stores the state of the cluster.


    Kubernetes resources and "records of intent" are all stored as API objects, and modified via RESTful calls to the API. The API allows configuration to be managed in a declarative way. Users can interact with the Kubernetes API directly, or via tools like kubectl. The core Kubernetes API is flexible and can also be extended to support custom resources.

  • LimitRange

    Provides constraints to limit resource consumption per Containers or Pods in a namespace.


    LimitRange limits the quantity of objects that can be created by type, as well as the amount of compute resources that may be requested/consumed by individual Containers or Pods in a namespace.

  • Logging

    Logs are the list of events that are logged by cluster or application.


    Application and systems logs can help you understand what is happening inside your cluster. The logs are particularly useful for debugging problems and monitoring cluster activity.

  • Managed Service

    A software offering maintained by a third-party provider.


    Some examples of Managed Services are AWS EC2, Azure SQL Database, and GCP Pub/Sub, but they can be any software offering that can be used by an application.

  • Manifest

    Specification of a Kubernetes API object in JSON or YAML format.


    A manifest specifies the desired state of an object that Kubernetes will maintain when you apply the manifest. Each configuration file can contain multiple manifests.

  • Master

    Legacy term, used as synonym for nodes hosting the control plane.


    The term is still being used by some provisioning tools, such as kubeadm, and managed services, to label nodes with kubernetes.io/role and control placement of control plane pods.

  • Minikube

    A tool for running Kubernetes locally.


    Minikube runs a single-node cluster inside a VM on your computer. You can use Minikube to try Kubernetes in a learning environment.

  • Mixed Version Proxy (MVP)
    またの名を: MVP

    Feature to let a kube-apiserver proxy a resource request to a different peer API server.


    When a cluster has multiple API servers running different versions of Kubernetes, this feature enables resource requests to be served by the correct API server.

    MVP is disabled by default and can be activated by enabling the feature gate named UnknownVersionInteroperabilityProxy when the API Server is started.

  • Namespace




  • Network Policy

    A specification of how groups of Pods are allowed to communicate with each other and with other network endpoints.


    Network Policies help you declaratively configure which Pods are allowed to connect to each other, which namespaces are allowed to communicate, and more specifically which port numbers to enforce each policy on. NetworkPolicy resources use labels to select Pods and define rules which specify what traffic is allowed to the selected Pods. Network Policies are implemented by a supported network plugin provided by a network provider. Be aware that creating a network resource without a controller to implement it will have no effect.

  • Node-pressure eviction
    またの名を: kubelet eviction

    Node-pressure eviction is the process by which the kubelet proactively terminates pods to reclaim resources on nodes.


    The kubelet monitors resources like CPU, memory, disk space, and filesystem inodes on your cluster's nodes. When one or more of these resources reach specific consumption levels, the kubelet can proactively fail one or more pods on the node to reclaim resources and prevent starvation.

    Node-pressure eviction is not the same as API-initiated eviction.

  • Object

    An entity in the Kubernetes system. The Kubernetes API uses these entities to represent the state of your cluster.


    A Kubernetes object is typically a “record of intent”—once you create the object, the Kubernetes control plane works constantly to ensure that the item it represents actually exists. By creating an object, you're effectively telling the Kubernetes system what you want that part of your cluster's workload to look like; this is your cluster's desired state.

  • Operator pattern

    The operator pattern is a system design that links a Controller to one or more custom resources.


    You can extend Kubernetes by adding controllers to your cluster, beyond the built-in controllers that come as part of Kubernetes itself.

    If a running application acts as a controller and has API access to carry out tasks against a custom resource that's defined in the control plane, that's an example of the Operator pattern.

  • Pod



    通常、Pod は一つの主コンテナを実行するように設定されます。ロギングなどの補足機能を付加する、取り外し可能なサイドカーコンテナを実行することもできます。Pod は通常 Deployment によって管理されます。

  • Pod Disruption

    Pod disruption is the process by which Pods on Nodes are terminated either voluntarily or involuntarily.


    Voluntary disruptions are started intentionally by application owners or cluster administrators. Involuntary disruptions are unintentional and can be triggered by unavoidable issues like Nodes running out of resources, or by accidental deletions.

  • Pod Disruption Budget
    またの名を: PDB

    A Pod Disruption Budget allows an application owner to create an object for a replicated application, that ensures a certain number or percentage of Pods with an assigned label will not be voluntarily evicted at any point in time.


    Involuntary disruptions cannot be prevented by PDBs; however they do count against the budget.

  • Pod Lifecycle

    The sequence of states through which a Pod passes during its lifetime.


    The Pod Lifecycle is defined by the states or phases of a Pod. There are five possible Pod phases: Pending, Running, Succeeded, Failed, and Unknown. A high-level description of the Pod state is summarized in the PodStatus phase field.

  • Pod Priority

    Pod Priority indicates the importance of a Pod relative to other Pods.


    Pod Priority gives the ability to set scheduling priority of a Pod to be higher and lower than other Pods — an important feature for production clusters workload.

  • Pod Security Policy

    Enables fine-grained authorization of Pod creation and updates.


    A cluster-level resource that controls security sensitive aspects of the Pod specification. The PodSecurityPolicy objects define a set of conditions that a Pod must run with in order to be accepted into the system, as well as defaults for the related fields. Pod Security Policy control is implemented as an optional admission controller.

    PodSecurityPolicy was deprecated as of Kubernetes v1.21, and removed in v1.25. As an alternative, use Pod Security Admission or a 3rd party admission plugin.

  • Preemption

    Preemption logic in Kubernetes helps a pending Pod to find a suitable Node by evicting low priority Pods existing on that Node.


    If a Pod cannot be scheduled, the scheduler tries to preempt lower priority Pods to make scheduling of the pending Pod possible.

  • Probe

    A check that the kubelet periodically performs against a container that is running in a pod, that will define container's state and health and informing container's lifecycle.


    To learn more, read container probes.

  • Proxy

    In computing, a proxy is a server that acts as an intermediary for a remote service.


    A client interacts with the proxy; the proxy copies the client's data to the actual server; the actual server replies to the proxy; the proxy sends the actual server's reply to the client.

    kube-proxy is a network proxy that runs on each node in your cluster, implementing part of the Kubernetes Service concept.

    You can run kube-proxy as a plain userland proxy service. If your operating system supports it, you can instead run kube-proxy in a hybrid mode that achieves the same overall effect using less system resources.

  • QoS Class

    QoS Class (Quality of Service Class) provides a way for Kubernetes to classify Pods within the cluster into several classes and make decisions about scheduling and eviction.


    QoS Class of a Pod is set at creation time based on its compute resources requests and limits settings. QoS classes are used to make decisions about Pods scheduling and eviction. Kubernetes can assign one of the following QoS classes to a Pod: Guaranteed, Burstable or BestEffort.

  • Quantity

    A whole-number representation of small or large numbers using SI suffixes.


    Quantities are representations of small or large numbers using a compact, whole-number notation with SI suffixes. Fractional numbers are represented using milli units, while large numbers can be represented using kilo, mega, or giga units.

    For instance, the number 1.5 is represented as 1500m, while the number 1000 can be represented as 1k, and 1000000 as 1M. You can also specify binary-notation suffixes; the number 2048 can be written as 2Ki.

    The accepted decimal (power-of-10) units are m (milli), k (kilo, intentionally lowercase), M (mega), G (giga), T (tera), P (peta), E (exa).

    The accepted binary (power-of-2) units are Ki (kibi), Mi (mebi), Gi (gibi), Ti (tebi), Pi (pebi), Ei (exbi).

  • RBAC (Role-Based Access Control)

    Manages authorization decisions, allowing admins to dynamically configure access policies through the Kubernetes API.


    RBAC utilizes roles, which contain permission rules, and role bindings, which grant the permissions defined in a role to a set of users.

  • Replica

    A copy or duplicate of a Pod or a set of pods. Replicas ensure high availability, scalability, and fault tolerance by maintaining multiple identical instances of a pod.


    Replicas are commonly used in Kubernetes to achieve the desired application state and reliability. They enable workload scaling and distribution across multiple nodes in a cluster.

    By defining the number of replicas in a Deployment or ReplicaSet, Kubernetes ensures that the specified number of instances are running, automatically adjusting the count as needed.

    Replica management allows for efficient load balancing, rolling updates, and self-healing capabilities in a Kubernetes cluster.

  • ReplicaSet



    Deploymentなどのワークロードオブジェクトは、ReplicaSetの仕様に基づいて、 設定された数のPodsがクラスターで稼働することを保証するために、 ReplicaSetを使用します。

  • ReplicationController

    A workload resource that manages a replicated application, ensuring that a specific number of instances of a Pod are running.


    The control plane ensures that the defined number of Pods are running, even if some Pods fail, if you delete Pods manually, or if too many are started by mistake.

  • Resource Quotas

    Provides constraints that limit aggregate resource consumption per Namespace.


    Limits the quantity of objects that can be created in a namespace by type, as well as the total amount of compute resources that may be consumed by resources in that project.

  • Reviewer

    A person who reviews code for quality and correctness on some part of the project.


    Reviewers are knowledgeable about both the codebase and software engineering principles. Reviewer status is scoped to a part of the codebase.

  • Secret





  • Security Context

    The securityContext field defines privilege and access control settings for a Pod or container.


    In a securityContext, you can define: the user that processes run as, the group that processes run as, and privilege settings. You can also configure security policies (for example: SELinux, AppArmor or seccomp).

    The PodSpec.securityContext setting applies to all containers in a Pod.

  • Service



    Serviceが対象とするPodの集合は、(通常)セレクターによって決定されます。 Podを追加または削除するとセレクターにマッチしているPodの集合は変更されます。 Serviceは、ネットワークトラフィックが現在そのワークロードを処理するPodの集合に向かうことを保証します。

    Kubernetes Serviceは、IPネットワーキング(IPv4、IPv6、またはその両方)を使用するか、ドメインネームシステム(DNS)でExternal Nameを参照します。


  • ServiceAccount

    Provides an identity for processes that run in a Pod.


    When processes inside Pods access the cluster, they are authenticated by the API server as a particular service account, for example, default. When you create a Pod, if you do not specify a service account, it is automatically assigned the default service account in the same Namespace.

  • Shuffle-sharding

    A technique for assigning requests to queues that provides better isolation than hashing modulo the number of queues.


    We are often concerned with insulating different flows of requests from each other, so that a high-intensity flow does not crowd out low-intensity flows. A simple way to put requests into queues is to hash some characteristics of the request, modulo the number of queues, to get the index of the queue to use. The hash function uses as input characteristics of the request that align with flows. For example, in the Internet this is often the 5-tuple of source and destination address, protocol, and source and destination port.

    That simple hash-based scheme has the property that any high-intensity flow will crowd out all the low-intensity flows that hash to the same queue. Providing good insulation for a large number of flows requires a large number of queues, which is problematic. Shuffle-sharding is a more nimble technique that can do a better job of insulating the low-intensity flows from the high-intensity flows. The terminology of shuffle-sharding uses the metaphor of dealing a hand from a deck of cards; each queue is a metaphorical card. The shuffle-sharding technique starts with hashing the flow-identifying characteristics of the request, to produce a hash value with dozens or more of bits. Then the hash value is used as a source of entropy to shuffle the deck and deal a hand of cards (queues). All the dealt queues are examined, and the request is put into one of the examined queues with the shortest length. With a modest hand size, it does not cost much to examine all the dealt cards and a given low-intensity flow has a good chance to dodge the effects of a given high-intensity flow. With a large hand size it is expensive to examine the dealt queues and more difficult for the low-intensity flows to dodge the collective effects of a set of high-intensity flows. Thus, the hand size should be chosen judiciously.

  • Sidecar Container

    One or more containers that are typically started before any app containers run.


    Sidecar containers are like regular app containers, but with a different purpose: the sidecar provides a Pod-local service to the main app container. Unlike init containers, sidecar containers continue running after Pod startup.

    Read Sidecar containers for more information.

  • SIG (special interest group)



    SIGのメンバーは、アーキテクチャ、API machinery、ドキュメンテーションといった、特定のエリアの改善に共通の関心をもっています。 SIGはガバナンスガイドラインに準拠していなければなりませんが、独自の貢献ポリシーやコミュニケーションのチャンネルを持つことが可能です。

    さらなる情報はコミュニティ (kubernetes/community)リポジトリとSIGとワーキンググループを参照して下さい。

  • Spec

    Defines how each object, like Pods or Services, should be configured and its desired state.


    Almost every Kubernetes object includes two nested object fields that govern the object's configuration: the object spec and the object status. For objects that have a spec, you have to set this when you create the object, providing a description of the characteristics you want the resource to have: its desired state.

    It varies for different objects like Pods, StatefulSets, and Services, detailing settings such as containers, volumes, replicas, ports,
    and other specifications unique to each object type. This field encapsulates what state Kubernetes should maintain for the defined

  • StatefulSet

    StatefulSetはDeploymentとPodのセットのスケーリングを管理し、それらのPodの順序と一意性を保証 します。




  • Static Pod

    A pod managed directly by the kubelet daemon on a specific node,


    without the API server observing it.

    Static Pods do not support ephemeral containers.

  • StorageClass



    StorageClassはサービス品質レベル、バックアップポリシー、クラスター管理者が決定した任意のポリシーにマッピングできます。 各StorageClassにはprovisioner parametersreclaimPolicyフィールドが含まれています。これらは、対象のStorageClassのPersistentVolumeを動的プロビジョニングする必要がある場合に使用されます。ユーザーはStorageClassオブジェクトの名前を使用して特定のStorageClassを要求できます。

  • sysctl

    sysctl is a semi-standardized interface for reading or changing the attributes of the running Unix kernel.


    On Unix-like systems, sysctl is both the name of the tool that administrators use to view and modify these settings, and also the system call that the tool uses.

    Container runtimes and network plugins may rely on sysctl values being set a certain way.

  • Taint

    A core object consisting of three required properties: key, value, and effect. Taints prevent the scheduling of Pods on nodes or node groups.


    Taints and tolerations work together to ensure that pods are not scheduled onto inappropriate nodes. One or more taints are applied to a node. A node should only schedule a Pod with the matching tolerations for the configured taints.

  • Toleration

    A core object consisting of three required properties: key, value, and effect. Tolerations enable the scheduling of pods on nodes or node groups that have matching taints.


    Tolerations and taints work together to ensure that pods are not scheduled onto inappropriate nodes. One or more tolerations are applied to a pod. A toleration indicates that the pod is allowed (but not required) to be scheduled on nodes or node groups with matching taints.

  • UID




  • Upstream (disambiguation)

    May refer to: core Kubernetes or the source repo from which a repo was forked.

    • In the Kubernetes Community: Conversations often use upstream to mean the core Kubernetes codebase, which the general ecosystem, other code, or third-party tools rely upon. For example, community members may suggest that a feature is moved upstream so that it is in the core codebase instead of in a plugin or third-party tool.
    • In GitHub or git: The convention is to refer to a source repo as upstream, whereas the forked repo is considered downstream.
  • user namespace

    A kernel feature to emulate root. Used for "rootless containers".


    User namespaces are a Linux kernel feature that allows a non-root user to emulate superuser ("root") privileges, for example in order to run containers without being a superuser outside the container.

    User namespace is effective for mitigating damage of potential container break-out attacks.

    In the context of user namespaces, the namespace is a Linux kernel feature, and not a namespace in the Kubernetes sense of the term.

  • Volume Plugin

    A Volume Plugin enables integration of storage within a Pod.


    A Volume Plugin lets you attach and mount storage volumes for use by a Pod. Volume plugins can be in tree or out of tree. In tree plugins are part of the Kubernetes code repository and follow its release cycle. Out of tree plugins are developed independently.

  • WG (working group)

    Facilitates the discussion and/or implementation of a short-lived, narrow, or decoupled project for a committee, SIG, or cross-SIG effort.


    Working groups are a way of organizing people to accomplish a discrete task.

    For more information, see the kubernetes/community repo and the current list of SIGs and working groups.

  • アグリゲーションレイヤー



    Kubernetes APIサーバーsupport additional APIsに設定すると、APIServiceオブジェクトを追加して、Kubernetes APIのURLパスを「要求」することができます。

  • サービスカタログ




  • アドミッションコントローラー

    オブジェクトを永続化する前に、Kubernetes APIサーバーへのリクエストをインターセプトするコード。


    アドミッションコントローラーはKubernetes APIサーバー用に構成可能で、「検証(validating)」、「変更(mutating)」、またはその両方を行うことができます。どのアドミッションコントローラーも、リクエストを拒否することができます。変更コントローラーは、自身が許可するオブジェクトを変更できますが、検証コントローラーは変更できません。

  • アノテーション




  • アフィニティ

    Kubernetesでは、アフィニティ(affinity) はPodを配置する場所に関するヒントをスケジューラーに与える一連のルールです。




  • アプリケーション
    様々なコンテナ化されたアプリケーションが実行される層。 [+]


  • アプリケーションアーキテクト



    アーキテクトは、アプリの実装によりスケーラブルで保守可能な方法で周囲のコンポーネントと対話できるようにします。 周囲のコンポーネントには、データベース、ロギングインフラストラクチャ、その他のマイクロサービスが含まれます。

  • アプリケーション開発者




  • ワークロード





  • イメージ




  • ノード



    ワーカーノードは、クラスターに応じてVMまたは物理マシンの場合があります。Podの実行に必要なローカルデーモンまたはサービスがあり、コントロールプレーンによって管理されます。ノード上のデーモンには、kubeletkube-proxy、およびDockerなどのCRIを実装するコンテナランタイムが含まれます。 Kubernetesの初期バージョンでは、ノードは"Minion"と呼ばれていました。

  • ガベージコレクション




  • クラウドコントローラーマネージャー

    クラウド特有の制御ロジックを組み込むKubernetesのcontrol planeコンポーネントです。クラウドコントロールマネージャーは、クラスターをクラウドプロバイダーAPIをリンクし、クラスターのみで相互作用するコンポーネントからクラウドプラットフォームで相互作用するコンポーネントを分離します。



  • クラスター



    ワーカーノードは、アプリケーションのコンポーネントであるPodをホストします。マスターノードは、クラスター内のワーカーノードとPodを管理します。複数のマスターノードを使用して、クラスターにフェイルオーバーと高可用性を提供します。 ワーカーノードは、アプリケーションワークロードのコンポーネントであるPodをホストします。コントロールプレーンは、クラスター内のワーカーノードとPodを管理します。本番環境では、コントロールプレーンは複数のコンピューターを使用し、クラスターは複数のノードを使用し、耐障害性や高可用性を提供します。

  • クラスター管理者




  • コンテナ




  • コンテナストレージインターフェイス(CSI)




  • コンテナランタイム



    Kubernetesは次の複数のコンテナランタイムをサポートします。 DockercontainerdCRI-O、 および全ての Kubernetes CRI (Container Runtime Interface) 実装です。

  • コントロールプレーン





  • コントリビューター



    貢献はPull Request(PRs)、Issue、フィードバック、special interest groups (SIG)への参加、またはコミュニティイベントの開催が含まれます。

  • セレクター




  • ファイナライザー

    ファイナライザーは、削除対象としてマークされたリソースを完全に削除する前に、特定の条件が満たされるまでKubernetesを待機させるための名前空間付きのキーです。 ファイナライザーは、削除されたオブジェクトが所有していたリソースをクリーンアップするようにコントローラーに警告します。


    Kubernetesにファイナライザーが指定されたオブジェクトを削除するように指示すると、Kubernetes APIはそのオブジェクトに.metadata.deletionTimestampを追加し削除対象としてマークして、ステータスコード202(HTTP "Accepted")を返します。 コントロールプレーンやその他のコンポーネントがファイナライザーによって定義されたアクションを実行している間、対象のオブジェクトは終了中の状態のまま残っています。 それらのアクションが完了したら、そのコントローラーは関係しているファイナライザーを対象のオブジェクトから削除します。 metadata.finalizersフィールドが空になったら、Kubernetesは削除が完了したと判断しオブジェクトを削除します。

    ファイナライザーはリソースのガベージコレクションを管理するために使うことができます。 例えば、コントローラーが対象のリソースを削除する前に関連するリソースやインフラをクリーンアップするためにファイナライザーを定義することができます。

  • プラットフォーム開発者



    プラットフォーム開発者は、特に自身のアプリケーションのために、例えばカスタムリソース集約レイヤーを使ったKubernetes APIの拡張を用いて、Kubernetesに機能を追加ことがあるかもしれません。一部のプラットフォーム開発者はまたコントリビューターとして、エクステンションを開発しKubernetesのコミュニティに貢献しています。他の方々は、クローズドソースな商用もしくは、サイト固有なエクステンションを開発しています。

  • ボリューム





  • ミラーPod

    kubeletがstatic Podを代表するために使用するPodオブジェクトです。


    kubeletが設定の中にstatic Podを発見すると、static Podに対応するPodオブジェクトをKubernetes APIサーバー上に自動的に作成しようとします。つまり、APIサーバーからはPodが見えていますが、制御まではできないということです。


  • メンバー



    メンバーはイシューとPRをアサインすることができ、GitHub teamを通じてspecial interest groups (SIGs)に参加することが可能です。メンバーのPRではPre-submitテストが自動で走ります。メンバーは、アクティブなコントリビューターとしてコミュニティに居続けることを期待されています。

  • ラベル




  • 永続ボリューム



    PersistentVolume(PV)はストレージの利用方法からストレージの提供方法の詳細を抽象化するAPIを提供します。 PVはストレージを事前に作成できるシナリオで直接使用されます(静的プロビジョニング)。 オンデマンドストレージ(動的プロビジョニング)を必要とするシナリオでは、代わりにPersistentVolumeClaims(PVC)が使用されます。

  • 永続ボリューム要求




  • 承認者




  • 名前(Name)




最終更新 June 22, 2021 at 6:22 PM PST: [ja] Remove exec permission on markdown files (7c256aa07e)