Kubernetes-如何知道最新支持的API版本

Question

给定k8s集群版本，是否有一张表格可以告诉我应该使用哪一组API版本？Kubernetes文档始终假设我始终拥有一个不错的，最新的集群（在撰写本文时为1.12），但是平台提供商并不总是生活在这一前沿，因此它可能很快就令人沮丧。

更好的是，是否存在kubectl我可以运行的命令，该命令可以使我集群告知每个资源类型及其最新支持的API版本？

Answer 1

我认为kubectl api-versions是一个更简单的选择：

 kubectl api-versions
admissionregistration.k8s.io/v1beta1
apiextensions.k8s.io/v1beta1
apiregistration.k8s.io/v1
apiregistration.k8s.io/v1beta1
apps/v1
apps/v1beta1
apps/v1beta2
authentication.k8s.io/v1
authentication.k8s.io/v1beta1
authorization.k8s.io/v1
authorization.k8s.io/v1beta1
autoscaling/v1
autoscaling/v2beta1
autoscaling/v2beta2
batch/v1
batch/v1beta1
certificates.k8s.io/v1beta1
coordination.k8s.io/v1
coordination.k8s.io/v1beta1
events.k8s.io/v1beta1
extensions/v1beta1
networking.k8s.io/v1
networking.k8s.io/v1beta1
node.k8s.io/v1beta1
policy/v1beta1
rbac.authorization.k8s.io/v1
rbac.authorization.k8s.io/v1beta1
scheduling.k8s.io/v1
scheduling.k8s.io/v1beta1
storage.k8s.io/v1
storage.k8s.io/v1beta1
v1

Answer 2

要获取所有资源类型及其关联版本的列表，请运行以下命令：

for kind in `kubectl api-resources | tail +2 | awk '{ print $1 }'`; do kubectl explain $kind; done | grep -e "KIND:" -e "VERSION:"

它应该产生像

KIND:     Binding
VERSION:  v1
KIND:     ComponentStatus
VERSION:  v1
KIND:     ConfigMap
VERSION:  v1
KIND:     Endpoints
VERSION:  v1
KIND:     Event
VERSION:  v1
...

如@Rico所述，它们的键位于kubectl explain命令中。这可能有点脆弱，因为它取决于打印输出的格式，但是它适用于kubernetes 1.9.6。

此外，信息可以从kubernetes API文档（为每个版本的链接）低效率的方式聚集在这里找到- https://kubernetes.io/docs/reference/#api-reference

Answer 3

这就是kubectl explain <resource>命令。例如对于豆荚：

$ kubectl explain pod
KIND:     Pod
VERSION:  v1   <==  API version

DESCRIPTION:
     Pod is a collection of containers that can run on a host. This resource is
     created by clients and scheduled onto hosts.

FIELDS:
   apiVersion   <string>
     APIVersion defines the versioned schema of this representation of an
     object. Servers should convert recognized schemas to the latest internal
     value, and may reject unrecognized values. More info:
     https://git.k8s.io/community/contributors/devel/api-conventions.md#resources

...

部署类似：

$ kubectl explain deploy
KIND:     Deployment
VERSION:  extensions/v1beta1 <== API Version

DESCRIPTION:
     DEPRECATED - This group version of Deployment is deprecated by
     apps/v1beta2/Deployment. See the release notes for more information.
     Deployment enables declarative updates for Pods and ReplicaSets.

FIELDS:
   apiVersion   <string>
     APIVersion defines the versioned schema of this representation of an
     object. Servers should convert recognized schemas to the latest internal
     value, and may reject unrecognized values. More info:
     https://git.k8s.io/community/contributors/devel/api-conventions.md#resources
...

此外，例如这里是v1.12 API 参考。