134 lines
4.6 KiB
Markdown
134 lines
4.6 KiB
Markdown
# APIService
|
||
|
||
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。
|
||
|
||
下面是一个APIService的示例配置：
|
||
|
||
```yaml
|
||
apiVersion: apiregistration.k8s.io/v1beta1
|
||
kind: APIService
|
||
metadata:
|
||
name: v1alpha1.custom-metrics.metrics.k8s.io
|
||
spec:
|
||
insecureSkipTLSVerify: true
|
||
group: custom-metrics.metrics.k8s.io
|
||
groupPriorityMinimum: 1000
|
||
versionPriority: 5
|
||
service:
|
||
name: api
|
||
namespace: custom-metrics
|
||
version: v1alpha1
|
||
```
|
||
|
||
## APIService详解
|
||
|
||
使用`apiregistration.k8s.io/v1beta1` 版本的APIService，在metadata.name中定义该API的名字。
|
||
|
||
使用上面的yaml的创建`v1alpha1.custom-metrics.metrics.k8s.io` APIService。
|
||
|
||
- `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。
|
||
- `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。
|
||
- `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。
|
||
- `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。
|
||
|
||
查看我们使用上面的yaml文件创建的APIService。
|
||
|
||
```bash
|
||
kubectl get apiservice v1alpha1.custom-metrics.metrics.k8s.io -o yaml
|
||
```
|
||
|
||
```yaml
|
||
apiVersion: apiregistration.k8s.io/v1beta1
|
||
kind: APIService
|
||
metadata:
|
||
creationTimestamp: 2017-12-14T08:27:35Z
|
||
name: v1alpha1.custom-metrics.metrics.k8s.io
|
||
resourceVersion: "35194598"
|
||
selfLink: /apis/apiregistration.k8s.io/v1beta1/apiservices/v1alpha1.custom-metrics.metrics.k8s.io
|
||
uid: a31a3412-e0a8-11e7-9fa4-f4e9d49f8ed0
|
||
spec:
|
||
caBundle: null
|
||
group: custom-metrics.metrics.k8s.io
|
||
groupPriorityMinimum: 1000
|
||
insecureSkipTLSVerify: true
|
||
service:
|
||
name: api
|
||
namespace: custom-metrics
|
||
version: v1alpha1
|
||
versionPriority: 5
|
||
status:
|
||
conditions:
|
||
- lastTransitionTime: 2017-12-14T08:27:38Z
|
||
message: all checks passed
|
||
reason: Passed
|
||
status: "True"
|
||
type: Available
|
||
```
|
||
|
||
## 查看集群支持的APISerivce
|
||
|
||
作为Kubernetes中的一种资源对象，可以使用`kubectl get apiservice`来查看。
|
||
|
||
例如查看集群中所有的APIService：
|
||
|
||
```bash
|
||
$ kubectl get apiservice
|
||
NAME AGE
|
||
v1. 2d
|
||
v1.authentication.k8s.io 2d
|
||
v1.authorization.k8s.io 2d
|
||
v1.autoscaling 2d
|
||
v1.batch 2d
|
||
v1.monitoring.coreos.com 1d
|
||
v1.networking.k8s.io 2d
|
||
v1.rbac.authorization.k8s.io 2d
|
||
v1.storage.k8s.io 2d
|
||
v1alpha1.custom-metrics.metrics.k8s.io 2h
|
||
v1beta1.apiextensions.k8s.io 2d
|
||
v1beta1.apps 2d
|
||
v1beta1.authentication.k8s.io 2d
|
||
v1beta1.authorization.k8s.io 2d
|
||
v1beta1.batch 2d
|
||
v1beta1.certificates.k8s.io 2d
|
||
v1beta1.extensions 2d
|
||
v1beta1.policy 2d
|
||
v1beta1.rbac.authorization.k8s.io 2d
|
||
v1beta1.storage.k8s.io 2d
|
||
v1beta2.apps 2d
|
||
v2beta1.autoscaling 2d
|
||
```
|
||
|
||
另外查看当前kubernetes集群支持的API版本还可以使用`kubectl api-version`：
|
||
|
||
```bash
|
||
$ kubectl api-versions
|
||
apiextensions.k8s.io/v1beta1
|
||
apiregistration.k8s.io/v1beta1
|
||
apps/v1beta1
|
||
apps/v1beta2
|
||
authentication.k8s.io/v1
|
||
authentication.k8s.io/v1beta1
|
||
authorization.k8s.io/v1
|
||
authorization.k8s.io/v1beta1
|
||
autoscaling/v1
|
||
autoscaling/v2beta1
|
||
batch/v1
|
||
batch/v1beta1
|
||
certificates.k8s.io/v1beta1
|
||
custom-metrics.metrics.k8s.io/v1alpha1
|
||
extensions/v1beta1
|
||
monitoring.coreos.com/v1
|
||
networking.k8s.io/v1
|
||
policy/v1beta1
|
||
rbac.authorization.k8s.io/v1
|
||
rbac.authorization.k8s.io/v1beta1
|
||
storage.k8s.io/v1
|
||
storage.k8s.io/v1beta1
|
||
v1
|
||
```
|
||
|
||
## 参考
|
||
|
||
[API Conventions](https://github.com/kubernetes/community/blob/master/contributors/devel/api-conventions.md#resources)
|
||
|
||
[Kuberentes1.8 reference doc](https://kubernetes.io/docs/api-reference/v1.8/#apiservicespec-v1beta1-apiregistration) |