168 lines
5.2 KiB
Markdown
168 lines
5.2 KiB
Markdown
---
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vssueId: 163
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# layout: StepLayout
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sharingTitle: CKA备考每日一题 - Day 1
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description: CKA备考每日一题 - Day 1
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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 1
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<AdSenseTitle/>
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**今日考题**
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以下 Daemonset yaml 中，哪些是正确的？（多选）
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A.
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``` yaml
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apiVersion: apps/v1
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kind: DaemonSet
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metadata:
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name: fluentd-elasticsearch
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namespace: default
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labels: k8s-app: fluentd-logging
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spec:
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selector:
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matchLabels:
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name: fluentd-elasticsearch
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template:
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metadata:
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labels:
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name: fluentd-elasticsearch
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spec:
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containers:
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- name: fluentd-elasticsearch
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image: gcr.io/fluentd-elasticsearch/fluentd:v2.5.1
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restartPolicy: Never
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```
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B.
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``` yaml
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apiVersion: apps/v1
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kind: DaemonSet
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metadata:
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name: fluentd-elasticsearch
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namespace: default
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labels:
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k8s-app: fluentd-logging
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spec:
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selector:
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matchLabels:
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name: fluentd-elasticsearch
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template:
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metadata:
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labels: name: fluentd-elasticsearch
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spec:
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containers:
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- name: fluentd-elasticsearch
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image: gcr.io/fluentd-elasticsearch/fluentd:v2.5.1
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restartPolicy: Onfailure
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```
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C.
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``` yaml
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apiVersion: apps/v1
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kind: DaemonSet
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metadata:
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name: fluentd-elasticsearch
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namespace: default
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labels:
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k8s-app: fluentd-logging
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spec:
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selector:
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matchLabels:
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name: fluentd-elasticsearch
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template:
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metadata:
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labels: name: fluentd-elasticsearch
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spec:
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containers:
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- name: fluentd-elasticsearch
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image: gcr.io/fluentd-elasticsearch/fluentd:v2.5.1
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restartPolicy: Always
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```
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D.
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``` yaml
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apiVersion: apps/v1
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kind: DaemonSet
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metadata:
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name: fluentd-elasticsearch
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namespace: default
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labels:
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k8s-app: fluentd-logging
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spec:
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selector:
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matchLabels:
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name: fluentd-elasticsearch
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template:
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metadata:
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labels:
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name: fluentd-elasticsearch
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spec:
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containers:
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- name: fluentd-elasticsearch
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image: gcr.io/fluentd-elasticsearch/fluentd:v2.5.1
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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001')">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： C、D**
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在考试时，只允许有考试网站和k8s两个标签页。所以平常学习时，尽可能去找文档去学习，才是最权威的。熟悉 [https://kubernetes.io/concepts/](https://kubernetes.io/concepts/) 目录下的内容对考试通过非常有帮助。
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[https://kuboard.cn/learning/](https://kuboard.cn/learning/) 目录下提供了 [https://kubernetes.io/concepts/](https://kubernetes.io/concepts/) 目录下的中文翻译，可以对照着学习。
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以这个问题为例，直接打开daemonset的说明文档，见以下链接：
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[https://kubernetes.io/docs/concepts/workloads/controllers/daemonset/](https://kubernetes.io/docs/concepts/workloads/controllers/daemonset/)
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> A Pod Template in a DaemonSet must have a RestartPolicy equal to Always, or be unspecified, which defaults to Always. Daemonset里的pod Template下必须有RestartPolicy，如果没指定，会默认为Always
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在 [https://kuboard.cn](https://kuboard.cn) 上也可以找到对应的中文内容：
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[https://kuboard.cn/learning/k8s-intermediate/workload/wl-daemonset/create.html](https://kuboard.cn/learning/k8s-intermediate/workload/wl-daemonset/create.html)
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restartPolicy 字段，可选值为 Always、OnFailure 和 Never。默认为 Always。一个Pod中可以有多个容器，restartPolicy适用于Pod 中的所有容器。restartPolicy作用是，让kubelet重启失败的容器。
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另外Deployment、Statefulset的restartPolicy也必须为Always，保证pod异常退出，或者健康检查 livenessProbe失败后由kubelet重启容器。[https://kubernetes.io/zh/docs/concepts/workloads/controllers/deployment](https://kubernetes.io/zh/docs/concepts/workloads/controllers/deployment) 或者 [https://kuboard.cn/learning/k8s-intermediate/workload/wl-deployment](https://kuboard.cn/learning/k8s-intermediate/workload/wl-deployment)
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Job和CronJob是运行一次的pod，restartPolicy只能为OnFailure或Never，确保容器执行完成后不再重启。[https://kubernetes.io/docs/concepts/workloads/controllers/jobs-run-to-completion/](https://kubernetes.io/docs/concepts/workloads/controllers/jobs-run-to-completion/) 或者 [https://kuboard.cn/learning/k8s-intermediate/workload/wl-job/](https://kuboard.cn/learning/k8s-intermediate/workload/wl-job/)
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> 实际考试以上机实操为主
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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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