给容器分配非透明整型资源

本页展示了如何给容器分配非透明整型资源。

FEATURE STATE: Kubernetes v1.11 feature-state-alpha.txt

This feature is currently in a alpha state, meaning:

The version names contain alpha (e.g. v1alpha1).
Might be buggy. Enabling the feature may expose bugs. Disabled by default.
Support for feature may be dropped at any time without notice.
The API may change in incompatible ways in a later software release without notice.
Recommended for use only in short-lived testing clusters, due to increased risk of bugs and lack of long-term support.

Before you begin
给Pod分配非透明整型资源
尝试创建第二个Pod
删除
What's next

Before you begin

You need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster. If you do not already have a cluster, you can create one by using Minikube, or you can use one of these Kubernetes playgrounds:

To check the version, enter kubectl version.

在做这个练习之前，请在给节点配置非透明整型资源文档中进行练习，该文档介绍了在一个节点上配置dongle资源。

给Pod分配非透明整型资源

为了请求一个非透明整型资源，需要在容器配置文件中包含resources:requests字段。非透明整型资源类型前缀是pod.alpha.kubernetes.io/opaque-int-resource-。

下面是含有一个容器的Pod的配置文件:

`oir-pod.yaml docs/tasks/configure-pod-container`
`apiVersion: v1 kind: Pod metadata: name: oir-demo spec: containers: - name: oir-demo-ctr image: nginx resources: requests: pod.alpha.kubernetes.io/opaque-int-resource-dongle: 3`

在配置文件中，可以看到容器请求了3个dongles资源。

创建Pod:

kubectl create -f https://k8s.io/docs/tasks/configure-pod-container/oir-pod.yaml

验证Pod是否正在运行:

kubectl get pod oir-demo

查询Pod的状态:

kubectl describe pod oir-demo

输出显示了dongle请求:

Requests:
  pod.alpha.kubernetes.io/opaque-int-resource-dongle: 3

尝试创建第二个Pod

下面是含有一个容器的Pod的配置文件。该容器请求了两个dongles资源。

`oir-pod-2.yaml docs/tasks/configure-pod-container`
`apiVersion: v1 kind: Pod metadata: name: oir-demo-2 spec: containers: - name: oir-demo-2-ctr image: nginx resources: requests: pod.alpha.kubernetes.io/opaque-int-resource-dongle: 2`

Kubernetes无法再满足两个dongles的请求，因为第一个Pod已经使用了四个可用dongles中的三个。

尝试创建Pod:

kubectl create -f https://k8s.io/docs/tasks/configure-pod-container/oir-pod-2.yaml

查询Pod的状态

kubectl describe pod oir-demo-2

输出显示该Pod无法被调度，因为没有节点有两个可用的dongles资源:

Conditions:
  Type    Status
  PodScheduled  False
...
Events:
  ...
  ... Warning   FailedScheduling  pod (oir-demo-2) failed to fit in any node
fit failure summary on nodes : Insufficient pod.alpha.kubernetes.io/opaque-int-resource-dongle (1)

查看Pod的状态:

kubectl get pod oir-demo-2

输出显示Pod已创建，但是没有被调度并运行在节点上。它的状态为Pending:

NAME         READY     STATUS    RESTARTS   AGE
oir-demo-2   0/1       Pending   0          6m

删除

删除本练习中创建的Pod:

kubectl delete pod oir-demo

What's next

对于应用开发者

对于集群管理员

给节点配置非透明整型资源