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版本:v1.8

通过 Karmada 分发 CRD

在本节中,我们将引导您完成以下内容:

  • 安装 Karmada 控制平面。
  • 将 CRD 分发到多个集群。
  • 在特定集群中自定义 CRD。

启动 Karmada 集群

想要启动 Karmada,您可以参考 here.

如果您只想尝试 Karmada,请使用 hack/local-up-karmada.sh 构建开发环境.

git clone https://github.com/karmada-io/karmada
cd karmada
hack/local-up-karmada.sh

分发 CRD

下面的步骤指导您如何分发 CRD Guestbook

假设您在 Karmada 仓库的 guestbook 目录下。

cd samples/guestbook

使用 Karmada 配置设置 KUBECONFIG 环境变量。

export KUBECONFIG=${HOME}/.kube/karmada.config
  1. 在 Karmada 的控制平面上创建 Guestbook CRD
kubectl apply -f guestbooks-crd.yaml 

此 CRD 应该被应用到 karmada-apiserver

  1. 创建 ClusterPropagationPolicy,将 Guestbook CRD 分发到 member1
kubectl apply -f guestbooks-clusterpropagationpolicy.yaml
# guestbooks-clusterpropagationpolicy.yaml
apiVersion: policy.karmada.io/v1alpha1
kind: ClusterPropagationPolicy
metadata:
name: example-policy
spec:
resourceSelectors:
- apiVersion: apiextensions.k8s.io/v1
kind: CustomResourceDefinition
name: guestbooks.webapp.my.domain
placement:
clusterAffinity:
clusterNames:
- member1

根据 ClusterPropagationPolicy 中定义的规则,此 CRD 将分发到成员集群。

注意:在这里我们只能使用 ClusterPropagationPolicy 而不是 PropagationPolicy。 更多详细信息,请参考 FAQ PropagationPolicy and ClusterPropagationPolicy

  1. 在 Karmada 控制平面上创建名为 guestbook-sample 的 Guestbook CR
kubectl apply -f guestbook.yaml
  1. 创建 PropagationPolicy,将 guestbook-sample 分发到 member1
kubectl apply -f guestbooks-propagationpolicy.yaml
# guestbooks-propagationpolicy.yaml
apiVersion: policy.karmada.io/v1alpha1
kind: PropagationPolicy
metadata:
name: example-policy
spec:
resourceSelectors:
- apiVersion: webapp.my.domain/v1
kind: Guestbook
placement:
clusterAffinity:
clusterNames:
- member1
  1. 检查 Karmada 中 guestbook-sample 的状态
kubectl get guestbook -oyaml

输出类似于以下内容:

apiVersion: webapp.my.domain/v1
kind: Guestbook
metadata:
annotations:
kubectl.kubernetes.io/last-applied-configuration: |
{"apiVersion":"webapp.my.domain/v1","kind":"Guestbook","metadata":{"annotations":{},"name":"guestbook-sample","namespace":"default"},"spec":{"alias":"Name","configMapName":"test","size":2}}
creationTimestamp: "2022-11-18T06:56:24Z"
generation: 1
labels:
propagationpolicy.karmada.io/name: example-policy
propagationpolicy.karmada.io/namespace: default
name: guestbook-sample
namespace: default
resourceVersion: "682895"
uid: 2f8eda5f-35ab-4ac3-bcd4-affcf36a9341
spec:
alias: Name
configMapName: test
size: 2

自定义 CRD

  1. 创建 OverridePolicy,将覆盖 member1 中 guestbook-sample 的 size 字段。
kubectl apply -f guestbooks-overridepolicy.yaml
# guestbooks-overridepolicy.yaml
apiVersion: policy.karmada.io/v1alpha1
kind: OverridePolicy
metadata:
name: guestbook-sample
spec:
resourceSelectors:
- apiVersion: webapp.my.domain/v1
kind: Guestbook
overrideRules:
- targetCluster:
clusterNames:
- member1
overriders:
plaintext:
- path: /spec/size
operator: replace
value: 4
- path: /metadata/annotations
operator: add
value: {"OverridePolicy":"test"}
  1. 检查来自成员集群的 guestbook-sample 的 size 字段
kubectl --kubeconfig=${HOME}/.kube/members.config config use-context member1
kubectl --kubeconfig=${HOME}/.kube/members.config get guestbooks -o yaml

如果按预期工作,则 .spec.size 将被覆盖为 4:

apiVersion: webapp.my.domain/v1
kind: Guestbook
metadata:
annotations:
OverridePolicy: test
kubectl.kubernetes.io/last-applied-configuration: |
{"apiVersion":"webapp.my.domain/v1","kind":"Guestbook","metadata":{"annotations":{},"name":"guestbook-sample","namespace":"default"},"spec":{"alias":"Name","configMapName":"test","size":2}}
resourcebinding.karmada.io/name: guestbook-sample-guestbook
resourcebinding.karmada.io/namespace: default
resourcetemplate.karmada.io/uid: 2f8eda5f-35ab-4ac3-bcd4-affcf36a9341
creationTimestamp: "2022-11-18T06:56:37Z"
generation: 2
labels:
propagationpolicy.karmada.io/name: example-policy
propagationpolicy.karmada.io/namespace: default
resourcebinding.karmada.io/key: 6849fdbd59
work.karmada.io/name: guestbook-sample-6849fdbd59
work.karmada.io/namespace: karmada-es-member1
name: guestbook-sample
namespace: default
resourceVersion: "430024"
uid: 8818e33d-10bf-4270-b3b9-585977425bc9
spec:
alias: Name
configMapName: test
size: 4