LFD259 Kubernetes开发者实验手册 (2019版)
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LFD259-labs_V2019-01-14 官方实验手册是一份由Linux Foundation（LF）发布的针对开发者的 Kubernetes 教程资料。该手册版本于2019年1月14日更新，包含了丰富的实践经验，旨在帮助开发者理解和掌握 Kubernetes 这一容器编排平台。Linux Foundation 保留了所有版权，并强调了这些培训材料的使用限制：参与者只能个人使用，不得复制、修改或分发给非参与者，也禁止用作他人的培训工具，除非得到 Linux Foundation 的书面许可。
手册中包含开源代码，这些代码可能由多个版权持有者提供，并遵循相应的开源许可证。这确保了知识产权的合规性，同时也鼓励创新和社区协作。Linux Foundation 提供的培训材料仅限于学员在课程中的使用，任何未经授权的复制、传播或商业用途都是被禁止的。
值得注意的是，Linux Foundation 不对本手册的内容或使用效果做出任何明确或隐含的保证，包括但不限于商品质量保证。这份出版物的完整性和准确性依赖于发布时的技术状态，可能会随着技术的发展而更新。此外，手册的发行者是 Linux Foundation，访问其官方网站（<https://www.linuxfoundation.org>）可以获取更多关于 Linux 和 Kubernetes 相关的信息和服务。
LFD259-labs_V2019-01-14 官方实验手册是开发者学习 Kubernetes 的重要资源，提供了实践操作的机会，对于理解和应用容器化技术具有很高的价值。然而，使用时务必遵守版权和许可协议，尊重知识产权。
10 CHAPTER 2. KUBERNETES ARCHITECTURE
container and verify it is running. In the Deployment Configuration chapter we will continue to work on this pod by
adding persistent storage and configure fluentd via a configMap.
Edit the YAML file and add a fluentd container. The dash should line up with the previous container dash. At this point
a name and image should be enough to start the second container.
student@ckad-1:~$ vim basic.yaml
basic.yaml
1 ....
2 containers:
3 - name: webcont
4 image: nginx
5 ports:
6 - containerPort: 80
7 - name: fdlogger
8 image: k8s.gcr.io/fluentd-gcp:1.30
2. Delete and create the pod again. The commands can be typed on a single line, separated by a semicolon. The backslash
is only used to fit on the page. This time you should see 2/2 under the READY column. You should also find information
on the fluentd container inside of the kubectl describe output.
student@ckad-1:~$ kubectl delete pod basicpod ; \
kubectl create -f basic.yaml
pod "basicpod" deleted
pod/basicpod created
student@ckad-1:~$ kubectl get pod
NAME READY STATUS RESTARTS AGE
basicpod 2/2 Running 0 2m8s
student@ckad-1:~$ kubectl describe pod basicpod
Name: basicpod
Namespace: default
Priority: 0
PriorityClassName: <none>
<output_omitted>
3. For now shut down the pod. We will use it again in a future exercise.
student@ckad-1:~$ kubectl delete pod basicpod
pod "basicpod" deleted
Exercise 2.5: Create a Simple Deployment
Creating a pod does not take advantage of orchestration abilities of Kubernetes. We will now create a Deployment
which gives use scalability reliability and updates.
1. Now run a containerized webserver nginx. Use kubectl create to create a simple, single replica deployment running
the nginx web server. It will create a single pod as we did previously but with new controllers to ensure it runs as well as
other features.
student@ckad-1:~$ kubectl create deployment firstpod --image=nginx
deployment.apps/firstpod created
2. Verify the new deployment exists and the desired number of pods matches the current number. Using a comma, you
can request two resource types at once. The Tab key can be helpful. Type enough of the word to be unique and press
the Tab key, it should complete the word. The deployment should show a number 1 for each value, such that the desired
number of pods matches the up-to-date and running number. The pod should show zero restarts.
LFD259: V 2019-01-14 © Copyright the Linux Foundation 2019. All rights reserved.
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