127 lines
3.1 KiB
Markdown
127 lines
3.1 KiB
Markdown
---
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vssueId: 170
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# layout: StepLayout
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sharingTitle: CKA备考打卡 - 每日一题 - Day 12
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description: CKA备考打卡 - 每日一题 - Day 12
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meta:
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- name: keywords
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content: Kubernetes,K8S,CKA,Certified Kubernetes Administrator
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---
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# CKA每日一题 --- Day 12
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<AdSenseTitle/>
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::: tip 考题
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```sh
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Set configuration context $ kubectl config use-context wk8s
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configure the kubelet systemed managed service, on the node labelled with name=wk8s-node-1,to launch a pod containing a single container of image nginx named myservice automatically.
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Any spec file requried should be placed in the /etc/kuberneteds/mainfests directory on the node
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Hints:
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You can ssh to the failed node using $ ssh wk8s-node-0
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You can assume elevated privileges on the node with the following command $ sudo -i
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```
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> 请给出操作步骤。
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:::
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<b-button v-b-toggle.collapse-join-error variant="danger" size="sm" style="margin-top: 1rem;" v-on:click="$sendGaEvent('cka-daily', 'cka-daily', 'CKA每日一题011')">答案及解析</b-button>
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<b-collapse id="collapse-join-error" class="mt-2">
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<b-card style="background-color: rgb(254, 240, 240); border: solid 1px #F56C6C;">
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## 答案
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切换至wk8s上下文：
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```sh
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kubectl config use-context wk8s
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```
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查看有label`name=wk8s-node-1`的node的信息
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```sh
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kubectl get nodes -l name=wk8s-node-1 -o wide
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```
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登录指定的机器，并获得操作权限。
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```sh
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ssh wk8s-node-0
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sudo -i
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```
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查看kubelet服务启动参数--config
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```sh
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systemctl status kubelet -l
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```
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在--config指定的文件中，找到staticPodPath文件目录
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```sh
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# cat /var/lib/kubelet/config.yaml|grep staticPodPath
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staticPodPath: /etc/kubernetes/manifests
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```
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在静态pod目录下创建yaml，使用下面命令生成符合要求的myservice.yaml，等待kubelet自动拉起静态pod
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```sh
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kubectl run myservice --image=nginx --generator=run-pod/v1 --dry-run -o yaml > myservice.yaml
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```
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## 解析
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**context相关操作官方命令指南：**
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https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#config
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**Create static Pods说明：**
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https://kubernetes.io/docs/tasks/configure-pod-container/static-pod/
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本题主要考kubelet的配置，以及Static Pod的创建。
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可以通过`systemctl status kubelet -l`查看kubelet进程的配置文件路径。
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以及通过配置文件`config.yaml`找到`staticPodPath`。
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有时候，情况可能会不一样，`systemctl status kubelet -l`查到的`10-kubeadm.conf`中没有`config.yaml`配置：
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而是将其直接用`--pod-manifest-path`传入，所以这种情况就需要修改`10-kubeadm.conf`中的配置路径（如果路径不是期望路径）
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``` sh
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--pod-manifest-path=/etc/kubernetes/manifests
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```
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修改后需要重启kubelet：
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``` sh
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systemctl start kubelet
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```
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</b-card>
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</b-collapse>
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> CKA 考试每日一题系列，全部内容由 [我的小碗汤](https://mp.weixin.qq.com/s/5tYgb_eSzHz_TMsi0U32gw) 创作，本站仅做转载
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<JoinCKACommunity/>
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