zoukankan      html  css  js  c++  java
  • kubernetes CRD

    CRD: CustomResourceDefinition

    CRD是Kubernetes为提高可扩展性,让开发者去自定义资源(如Deployment,StatefulSet等)的一种方法。Operator = CRD + Controller

    CRD仅仅是资源的定义,而Controller可以去监听CRD的CRUD事件来添加自定义业务逻辑。

    网上很多老的教程关于crd的,都有点旧了,按照yaml走可能不成功的,看博文以前注意观察文章创建时间,尽量看官网原文。

    官网链接:https://kubernetes.io/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definitions/

    创建CRD用的yaml: resourcedefinition.yaml 

    apiVersion: apiextensions.k8s.io/v1
    kind: CustomResourceDefinition
    metadata:
      # name must match the spec fields below, and be in the form: <plural>.<group>
      name: crontabs.stable.example.com
    spec:
      # group name to use for REST API: /apis/<group>/<version>
      group: stable.example.com
      # list of versions supported by this CustomResourceDefinition
      versions:
        - name: v1
          # Each version can be enabled/disabled by Served flag.
          served: true
          # One and only one version must be marked as the storage version.
          storage: true
          schema:
            openAPIV3Schema:
              type: object
              properties:
                spec:
                  type: object
                  properties:
                    cronSpec:
                      type: string
                    image:
                      type: string
                    replicas:
                      type: integer
      # either Namespaced or Cluster
      scope: Namespaced
      names:
        # plural name to be used in the URL: /apis/<group>/<version>/<plural>
        plural: crontabs
        # singular name to be used as an alias on the CLI and for display
        singular: crontab
        # kind is normally the CamelCased singular type. Your resource manifests use this.
        kind: CronTab
        # shortNames allow shorter string to match your resource on the CLI
        shortNames:
        - ct

    命令查看CRD对象

    kubectl apply -f resourcedefinition.yaml

    创建一个刚创建的CronTab crd的一个实例 my-crontab.yaml 

    apiVersion: "stable.example.com/v1"
    kind: CronTab
    metadata:
      name: my-new-cron-object
    spec:
      cronSpec: "* * * * */5"
      image: my-awesome-cron-image
    # 创建
    kubectl apply -f my-crontab.yaml
    
    # 查看
    kubectl get crontab
    
    # 输出yaml定义
    kubectl get ct -o yaml
    
    # 删除crd
    kubectl delete -f resourcedefinition.yaml
  • 相关阅读:
    HTML5标签变化
    接口测试基础入门学习
    1.1Axure简介
    win 7命令行大全
    程序集强签名
    源代码的文件头格式化
    redmine2.3环境搭建
    静态成员和方法的使用场合及利弊分析
    .Net Memory Profiler入门
    TransactionScope类
  • 原文地址:https://www.cnblogs.com/yspworld/p/13389703.html
Copyright © 2011-2022 走看看