125 lines
4.4 KiB
Markdown
125 lines
4.4 KiB
Markdown
---
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title: 构建一个基本的 DaemonSet
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content_type: task
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weight: 5
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---
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<!--
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title: Building a Basic DaemonSet
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content_type: task
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weight: 5
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-->
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<!-- overview -->
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<!--
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This page demonstrates how to build a basic {{< glossary_tooltip text="DaemonSet" term_id="daemonset" >}}
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that runs a Pod on every node in a Kubernetes cluster.
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It covers a simple use case of mounting a file from the host, logging its contents using
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an [init container](/docs/concepts/workloads/pods/init-containers/), and utilizing a pause container.
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-->
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本页演示如何构建一个基本的 {{< glossary_tooltip text="DaemonSet" term_id="daemonset" >}}，
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用其在 Kubernetes 集群中的每个节点上运行 Pod。
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这个简单的使用场景包含了从主机挂载一个文件，使用
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[Init 容器](/zh-cn/docs/concepts/workloads/pods/init-containers/)记录文件的内容，
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以及使用 `pause` 容器。
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## {{% heading "prerequisites" %}}
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{{< include "task-tutorial-prereqs.md" >}}
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<!--
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A Kubernetes cluster with at least two nodes (one control plane node and one worker node)
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to demonstrate the behavior of DaemonSets.
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-->
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为了演示 DaemonSet 的行为，Kubernetes 集群至少需包含两个节点（一个控制平面节点和一个工作节点）。
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<!--
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## Define the DaemonSet
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In this task, a basic DaemonSet is created which ensures that the copy of a Pod is scheduled on every node.
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The Pod will use an init container to read and log the contents of `/etc/machine-id` from the host,
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while the main container will be a `pause` container, which keeps the Pod running.
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-->
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## 定义 DaemonSet {#define-the-daemonset}
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在此任务中，将创建一个基本的 DaemonSet，确保 Pod 的副本被调度到每个节点上。
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此 Pod 将使用 Init 容器从主机读取并记录 `/etc/machine-id` 的内容，
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而主容器将是一个 `pause` 容器，用于保持 Pod 运行。
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{{% code_sample file="application/basic-daemonset.yaml" %}}
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<!--
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1. Create a DaemonSet based on the (YAML) manifest:
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-->
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1. 基于（YAML）清单创建 DaemonSet：
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```shell
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kubectl apply -f https://k8s.io/examples/application/basic-daemonset.yaml
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```
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<!--
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1. Once applied, you can verify that the DaemonSet is running a Pod on every node in the cluster:
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-->
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2. 完成创建操作后，你可以验证 DaemonSet 是否在集群中的每个节点上运行 Pod：
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```shell
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kubectl get pods -o wide
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```
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<!--
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The output will list one Pod per node, similar to:
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-->
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输出将列出每个节点上有一个 Pod，类似于：
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```
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NAME READY STATUS RESTARTS AGE IP NODE
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example-daemonset-xxxxx 1/1 Running 0 5m x.x.x.x node-1
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example-daemonset-yyyyy 1/1 Running 0 5m x.x.x.x node-2
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```
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1. You can inspect the contents of the logged `/etc/machine-id` file by checking
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the log directory mounted from the host:
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-->
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3. 你可以通过检查从主机挂载的日志目录来查看 `/etc/machine-id` 文件的日志内容：
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```shell
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kubectl exec <pod-name> -- cat /var/log/machine-id.log
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```
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<!--
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Where `<pod-name>` is the name of one of your Pods.
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-->
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其中 `<pod-name>` 是某一个 Pod 的名称。
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## {{% heading "cleanup" %}}
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<!--
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To delete the DaemonSet, run this command:
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-->
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要删除 DaemonSet，请运行以下命令：
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```shell
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kubectl delete --cascade=foreground --ignore-not-found --now daemonsets/example-daemonset
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```
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<!--
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This simple DaemonSet example introduces key components like init containers and host path volumes,
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which can be expanded upon for more advanced use cases. For more details refer to
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[DaemonSet](/docs/concepts/workloads/controllers/daemonset/).
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-->
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这个简单的 DaemonSet 例子介绍了 Init 容器和主机路径卷这类关键组件，
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你可以在此基础上扩展以应对更高级的使用场景。有关细节参阅
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[DaemonSet](/zh-cn/docs/concepts/workloads/controllers/daemonset/)。
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## {{% heading "whatsnext" %}}
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<!--
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* See [Performing a rolling update on a DaemonSet](/docs/tasks/manage-daemon/update-daemon-set/)
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* See [Creating a DaemonSet to adopt existing DaemonSet pods](/docs/concepts/workloads/controllers/daemonset/)
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-->
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* 参阅[在 DaemonSet 上执行滚动更新](/zh-cn/docs/tasks/manage-daemon/update-daemon-set/)
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* 参见[创建 DaemonSet 以收养现有 DaemonSet Pod](/zh-cn/docs/concepts/workloads/controllers/daemonset/)
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