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website/content/zh/docs/tasks/administer-cluster/manage-resources/cpu-default-namespace.md

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zh-trans: Add manage-resources/cpu-default-namespace.md (#11043) * zh-trans: Add manage-resources/cpu-default-namespace.md zh-trans: Add manage-resources/cpu-default-namespace.md Add manage-resources/cpu-default-namespace.md Add manage-resources/cpu-default-namespace.md * Create cpu-defaults.yaml * Create cpu-defaults-pod.yaml * Create cpu-defaults-pod-2.yaml * Create cpu-defaults-pod-3.yaml
2018-11-19 13:00:52 +00:00
<!--
---
title: Configure Default CPU Requests and Limits for a Namespace
content_template: templates/task
weight: 20
---
-->
---
title: 为命名空间配置默认的CPU请求和限制
content_template: templates/task
weight: 20
---
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<!--
This page shows how to configure default CPU requests and limits for a namespace.
A Kubernetes cluster can be divided into namespaces. If a Container is created in a namespace
that has a default CPU limit, and the Container does not specify its own CPU limit, then
the Container is assigned the default CPU limit. Kubernetes assigns a default CPU request
under certain conditions that are explained later in this topic.
-->
本章介绍怎样为命名空间配置默认的 CPU 请求和限制。
一个 Kubernetes 集群可被划分为多个命名空间。如果在配置了 CPU 限制的命名空间创建容器，并且该容器没有声明自己的 CPU 限制，那么这个容器会被指定默认的 CPU 限制。Kubernetes 在一些特定情况还会指定 CPU 请求，本文后续章节将会对其进行解释。
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{{< include "task-tutorial-prereqs.md" >}} {{< version-check >}}
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<!--
## Create a namespace
-->
## 创建命名空间
<!--
Create a namespace so that the resources you create in this exercise are
isolated from the rest of your cluster.
-->
创建一个命名空间，以便本练习中创建的资源和集群的其余部分相隔离。
```shell
kubectl create namespace default-cpu-example
```
<!--
## Create a LimitRange and a Pod
-->
创建 LimitRange 和 Pod
<!--
Here's the configuration file for a LimitRange object. The configuration specifies
a default CPU request and a default CPU limit.
-->
这里给出了 LimitRange 对象的配置文件。该配置声明了一个默认的 CPU 请求和一个默认的 CPU 限制。
{{< codenew file="admin/resource/cpu-defaults.yaml" >}}
<!--
Create the LimitRange in the default-cpu-example namespace:
-->
在命名空间 default-cpu-example 中创建 LimitRange 对象：
```shell
kubectl create -f https://k8s.io/examples/admin/resource/cpu-defaults.yaml --namespace=default-cpu-example
```
<!--
Now if a Container is created in the default-cpu-example namespace, and the
Container does not specify its own values for CPU request and CPU limit,
the Container is given a default CPU request of 0.5 and a default
CPU limit of 1.
Here's the configuration file for a Pod that has one Container. The Container
does not specify a CPU request and limit.
-->
现在如果在 default-cpu-example 命名空间创建一个容器，该容器没有声明自己的 CPU 请求和限制时，将会给它指定默认的 CPU 请求0.5和默认的 CPU 限制值1.
这里给出了包含一个容器的 Pod 的配置文件。该容器没有声明 CPU 请求和限制。
{{< codenew file="admin/resource/cpu-defaults-pod.yaml" >}}
<!--
Create the Pod.
-->
创建 Pod。
```shell
kubectl create -f https://k8s.io/examples/admin/resource/cpu-defaults-pod.yaml --namespace=default-cpu-example
```
<!--
View the Pod's specification:
-->
查看该 Pod 的声明：
```shell
kubectl get pod default-cpu-demo --output=yaml --namespace=default-cpu-example
```
<!--
The output shows that the Pod's Container has a CPU request of 500 millicpus and
a CPU limit of 1 cpu. These are the default values specified by the LimitRange.
-->
输出显示该 Pod 的容器有一个500 millicpus的 CPU 请求和一个1 cpu的 CPU 限制。这些是 LimitRange 声明的默认值。
```shell
containers:
- image: nginx
imagePullPolicy: Always
name: default-cpu-demo-ctr
resources:
limits:
cpu: "1"
requests:
cpu: 500m
```
<!--
## What if you specify a Container's limit, but not its request?
-->
## 你只声明容器的限制，而不声明请求会怎么样？
<!--
Here's the configuration file for a Pod that has one Container. The Container
specifies a CPU limit, but not a request:
-->
这是包含一个容器的 Pod 的配置文件。该容器声明了 CPU 限制，而没有声明 CPU 请求。
{{< codenew file="admin/resource/cpu-defaults-pod-2.yaml" >}}
<!--
Create the Pod:
-->
创建 Pod
```shell
kubectl create -f https://k8s.io/examples/admin/resource/cpu-defaults-pod-2.yaml --namespace=default-cpu-example
```
<!--
View the Pod specification:
-->
查看 Pod 的声明：
```
kubectl get pod default-cpu-demo-2 --output=yaml --namespace=default-cpu-example
```
<!--
The output shows that the Container's CPU request is set to match its CPU limit.
Notice that the Container was not assigned the default CPU request value of 0.5 cpu.
-->
输出显示该容器的 CPU 请求和 CPU 限制设置相同。注意该容器没有被指定默认的 CPU 请求值0.5 cpu。
```
resources:
limits:
cpu: "1"
requests:
cpu: "1"
```
<!--
## What if you specify a Container's request, but not its limit?
-->
## 你只声明容器的请求，而不声明它的限制会怎么样？
<!--
Here's the configuration file for a Pod that has one Container. The Container
specifies a CPU request, but not a limit:
-->
这里给出了包含一个容器的 Pod 的配置文件。该容器声明了 CPU 请求，而没有声明 CPU 限制。
{{< codenew file="admin/resource/cpu-defaults-pod-3.yaml" >}}
<!--
Create the Pod:
-->
创建 Pod：
```shell
kubectl create -f https://k8s.io/examples/admin/resource/cpu-defaults-pod-3.yaml --namespace=default-cpu-example
```
<!--
View the Pod specification:
-->
查看 Pod 的声明：
```
kubectl get pod default-cpu-demo-3 --output=yaml --namespace=default-cpu-example
```
<!--
The output shows that the Container's CPU request is set to the value specified in the
Container's configuration file. The Container's CPU limit is set to 1 cpu, which is the
default CPU limit for the namespace.
-->
结果显示该容器的 CPU 请求被设置为容器配置文件中声明的数值。容器的CPU限制被设置为1 cpu，即该命名空间的默认 CPU 限制值。
```
resources:
limits:
cpu: "1"
requests:
cpu: 750m
```
<!--
## Motivation for default CPU limits and requests
-->
## 默认 CPU 限制和请求的动机
<!--
If your namespace has a
[resource quota](/docs/tasks/administer-cluster/manage-resources/quota-memory-cpu-namespace/),
it is helpful to have a default value in place for CPU limit.
Here are two of the restrictions that a resource quota imposes on a namespace:
* Every Container that runs in the namespace must have its own CPU limit.
* The total amount of CPU used by all Containers in the namespace must not exceed a specified limit.
If a Container does not specify its own CPU limit, it is given the default limit, and then
it can be allowed to run in a namespace that is restricted by a quota.
-->
如果你的命名空间有一个[资源配额](/docs/tasks/administer-cluster/manage-resources/quota-memory-cpu-namespace/),那么有一个默认的 CPU 限制是有帮助的。这里有两条资源配额强加给命名空间的限制：
* 命名空间中运行的每个容器必须有自己的 CPU 限制。
* 命名空间中所有容器使用的 CPU 总和不能超过一个声明值。
如果容器没有声明自己的 CPU 限制，将会给它一个默认限制，这样它就能被允许运行在一个有配额限制的命名空间中。
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<!--
### For cluster administrators
-->
### 集群管理员参考
<!--
* [Configure Default Memory Requests and Limits for a Namespace](/docs/tasks/administer-cluster/memory-default-namespace/)
* [Configure Minimum and Maximum Memory Constraints for a Namespace](/docs/tasks/administer-cluster/memory-constraint-namespace/)
* [Configure Minimum and Maximum CPU Constraints for a Namespace](/docs/tasks/administer-cluster/cpu-constraint-namespace/)
* [Configure Memory and CPU Quotas for a Namespace](/docs/tasks/administer-cluster/quota-memory-cpu-namespace/)
* [Configure a Pod Quota for a Namespace](/docs/tasks/administer-cluster/quota-pod-namespace/)
* [Configure Quotas for API Objects](/docs/tasks/administer-cluster/quota-api-object/)
-->
* [为命名空间配置默认内存请求和限制](/docs/tasks/administer-cluster/memory-default-namespace/)
* [为命名空间配置内存限制的最小值和最大值](/docs/tasks/administer-cluster/memory-constraint-namespace/)
* [为命名空间配置CPU限制的最小值和最大值](/docs/tasks/administer-cluster/cpu-constraint-namespace/)
* [为命名空间配置内存和CPU配额](/docs/tasks/administer-cluster/quota-memory-cpu-namespace/)
* [为命名空间配置Pod配额](/docs/tasks/administer-cluster/quota-pod-namespace/)
* [为API对象配置配额](/docs/tasks/administer-cluster/quota-api-object/)
<!--
### For app developers
-->
### 应用开发者参考
<!--
* [Assign Memory Resources to Containers and Pods](/docs/tasks/configure-pod-container/assign-memory-resource/)
* [Assign CPU Resources to Containers and Pods](/docs/tasks/configure-pod-container/assign-cpu-resource/)
* [Configure Quality of Service for Pods](/docs/tasks/configure-pod-container/quality-service-pod/)
-->
* [为容器和Pod分配内存资源](/docs/tasks/configure-pod-container/assign-memory-resource/)
* [为容器和Pod分配CPU资源](/docs/tasks/configure-pod-container/assign-cpu-resource/)
* [为Pod配置Service数量](/docs/tasks/configure-pod-container/quality-service-pod/)
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