Kubernetes CKA真题解析-20200402真题

1.日志 kubectl logs

监控 foobar Pod 的日志，提取 pod 相应的行’error’写入到/logs 文件中

Set configuration context $ kubectl config use-context k8s Monitor the logs of Pod foobar and
	Extract log lines corresponding to error file-not-found
	Write them to /opt/KULM00201/foobar

  kubectl logs foobar | grep file-not-found > /logs

2.输出排序 --sort-by=.metadata.name

使用 name 排序列出所有的 PV，把输出内容存储到/opt/文件中 使用 kubectl own 对输出进行排序，并且不再进一步操作它

List all PVs sorted by name saving the full kubectl output to /opt/KUCC0010/my_volumes . Use kubectl’s own functionally for sorting the output, and do not manipulate it any further.

  kubectl get pv --all-namespace --sort-by=.metadata.name > /opt/

3.ds部署

确保在 kubectl 集群的每个节点上运行一个 Nginx Pod。其中 Nginx Pod 必须使用 Nginx 镜像。不要覆盖当前环境中的任何 traints。 使用 Daemonset 来完成这个任务，Daemonset 的名字使用 ds。

Ensure a single instance of Pod nginx is running on each node of the kubernetes cluster where nginx also represents the image name which has to be used. Do no override any taints currently in place.

Use Daemonsets to complete this task and use ds.kusc00201 as Daemonset name

题目对应文档：https://kubernetes.io/docs/concepts/workloads/controllers/daemonset/
删除tolerations字段，复制到image: gcr.io/fluentd-elasticsearch/fluentd:v2.5.1这里即可，再按题意更改yaml文件。
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: ds
  namespace: kube-system
  labels:
	k8s-app: fluentd-logging
spec:
  selector:
	matchLabels:
	  name: fluentd-elasticsearch
  template:
	metadata:
	  labels:
		name: fluentd-elasticsearch
	spec:
	  containers:
	  - name: fluentd-elasticsearch
		image: nginx

4.initContainers

添加一个 initcontainer 到 lum(/etc/data)这个 initcontainer 应该创建一个名为/workdir/calm.txt 的空文件，如果/workdir/calm.txt 没有被检测到，这个 Pod 应该退出

	Add an init container to lumpy--koala (Which has been defined in spec file /opt/kucc00100/pod-spec-KUCC00100.yaml)
	The init container should create an empty file named /workdir/calm.txt
	If /workdir/calm.txt is not detected, the Pod should exit
	Once the spec file has been updated with the init container definition, the Pod shou
ld be created.

• • 题目中yaml文件已经给出，只需要增加initcontainers部分，以及emptyDir: {} 即可
    init文档位置：https://kubernetes.io/docs/concepts/workloads/pods/init-containers/
    在最后加上

  initContainers:
  - name: init-poda
    image: busybox
    command: ['sh','-c','touch /workdir/clam.txt']
  volumeMounts:
  - name: workdir
    mountPath: "/workdir"
  

5.多容器

创建一个名为 kucc 的 Pod,其中内部运行着 nginx+redis+memcached+consul 4 个容器

Create a pod named kucc4 with a single container for each of the following images running inside (there may be between 1 and 4 images specified): nginx + redis + memcached + consul

参考链接：
https://v1-14.docs.kubernetes.io/docs/concepts/workloads/pods/pod-overview/

	apiVersion: v1
	kind: Pod
	metadata:
	  name: kucc
	spec:
	  containers:
	  - name: nginx
		image: nginx
	  - name: redis
		image: redis
	  - name: memcached
		image: memcached
	  - name: consul
		image: consul

6.nodeSelector

创建 Pod，名字为 nginx，镜像为 nginx，部署到 label disk=ssd的node上

Schedule a P