135 lines
4.6 KiB
Markdown
135 lines
4.6 KiB
Markdown
# APIService
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APIService是用来表示一个特定的`GroupVersion`的中的server，它的结构定义位于代码`staging/src/k8s.io/kube-aggregator/pkg/apis/apiregistration/types.go`中。
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下面是一个APIService的示例配置：
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```yaml
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apiVersion: apiregistration.k8s.io/v1beta1
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kind: APIService
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metadata:
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name: v1alpha1.custom-metrics.metrics.k8s.io
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spec:
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insecureSkipTLSVerify: true
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group: custom-metrics.metrics.k8s.io
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groupPriorityMinimum: 1000
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versionPriority: 5
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service:
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name: api
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namespace: custom-metrics
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version: v1alpha1
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```
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## APIService详解
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使用`apiregistration.k8s.io/v1beta1` 版本的APIService，在metadata.name中定义该API的名字。
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使用上面的yaml的创建`v1alpha1.custom-metrics.metrics.k8s.io` APIService。
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- `insecureSkipTLSVerify `：当与该服务通信时，禁用TLS证书认证。强加建议不要设置这个参数，默认为 false。应该使用CABundle代替。
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- `service`：与该APIService通信时引用的service，其中要注明service的名字和所属的namespace，如果为空的话，则所有的服务都会该API groupversion将在本地443端口处理所有通信。
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- `groupPriorityMinimum`：该组API的处理优先级，主要排序是基于`groupPriorityMinimum`，该数字越大表明优先级越高，客户端就会与其通信处理请求。次要排序是基于字母表顺序，例如v1.bar比v1.foo的优先级更高。
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- `versionPriority`：VersionPriority控制其组内的API版本的顺序。必须大于零。主要排序基于VersionPriority，从最高到最低（20大于10）排序。次要排序是基于对象名称的字母比较。 （v1.foo在v1.bar之前）由于它们都是在一个组内，因此数字可能很小，一般都小于10。
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查看我们使用上面的yaml文件创建的APIService。
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```bash
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kubectl get apiservice v1alpha1.custom-metrics.metrics.k8s.io -o yaml
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```
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```yaml
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apiVersion: apiregistration.k8s.io/v1beta1
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kind: APIService
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metadata:
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creationTimestamp: 2017-12-14T08:27:35Z
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name: v1alpha1.custom-metrics.metrics.k8s.io
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resourceVersion: "35194598"
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selfLink: /apis/apiregistration.k8s.io/v1beta1/apiservices/v1alpha1.custom-metrics.metrics.k8s.io
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uid: a31a3412-e0a8-11e7-9fa4-f4e9d49f8ed0
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spec:
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caBundle: null
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group: custom-metrics.metrics.k8s.io
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groupPriorityMinimum: 1000
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insecureSkipTLSVerify: true
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service:
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name: api
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namespace: custom-metrics
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version: v1alpha1
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versionPriority: 5
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status:
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conditions:
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- lastTransitionTime: 2017-12-14T08:27:38Z
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message: all checks passed
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reason: Passed
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status: "True"
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type: Available
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```
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## 查看集群支持的APISerivce
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作为Kubernetes中的一种资源对象，可以使用`kubectl get apiservice`来查看。
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例如查看集群中所有的APIService：
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```bash
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$ kubectl get apiservice
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NAME AGE
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v1. 2d
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v1.authentication.k8s.io 2d
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v1.authorization.k8s.io 2d
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v1.autoscaling 2d
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v1.batch 2d
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v1.monitoring.coreos.com 1d
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v1.networking.k8s.io 2d
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v1.rbac.authorization.k8s.io 2d
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v1.storage.k8s.io 2d
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v1alpha1.custom-metrics.metrics.k8s.io 2h
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v1beta1.apiextensions.k8s.io 2d
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v1beta1.apps 2d
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v1beta1.authentication.k8s.io 2d
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v1beta1.authorization.k8s.io 2d
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v1beta1.batch 2d
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v1beta1.certificates.k8s.io 2d
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v1beta1.extensions 2d
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v1beta1.policy 2d
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v1beta1.rbac.authorization.k8s.io 2d
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v1beta1.storage.k8s.io 2d
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v1beta2.apps 2d
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v2beta1.autoscaling 2d
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```
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另外查看当前kubernetes集群支持的API版本还可以使用`kubectl api-versions`：
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```bash
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$ kubectl api-versions
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apiextensions.k8s.io/v1beta1
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apiregistration.k8s.io/v1beta1
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apps/v1beta1
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apps/v1beta2
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authentication.k8s.io/v1
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authentication.k8s.io/v1beta1
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authorization.k8s.io/v1
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authorization.k8s.io/v1beta1
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autoscaling/v1
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autoscaling/v2beta1
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batch/v1
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batch/v1beta1
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certificates.k8s.io/v1beta1
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custom-metrics.metrics.k8s.io/v1alpha1
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extensions/v1beta1
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monitoring.coreos.com/v1
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networking.k8s.io/v1
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policy/v1beta1
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rbac.authorization.k8s.io/v1
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rbac.authorization.k8s.io/v1beta1
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storage.k8s.io/v1
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storage.k8s.io/v1beta1
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v1
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```
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## 参考
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[API Conventions](https://github.com/kubernetes/community/blob/master/contributors/devel/api-conventions.md#resources)
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[Kuberentes1.8 reference doc](https://kubernetes.io/docs/api-reference/v1.8/#apiservicespec-v1beta1-apiregistration)
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