LFD259官方实验手册：Kubernetes开发者指南 (2019年版)

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LFD259-labs_V2019-03-11 官方实验手册是一份由Linux Foundation（LF）发布的针对开发人员的 Kubernetes 学习资料。该手册于 2019 年 3 月 11 日更新，版权全归 Linux Foundation 所有，所有权利受到保护。课程材料包括教学内容和开发成果，均受版权法和知识产权法律约束。手册中的开源代码遵循相应的许可证进行使用，这意味着参与者可以在个人学习过程中使用这些代码，但禁止未经 Linux Foundation 的书面许可进行复制、修改或分发给非参与者，或者用作提供培训他人的工具。任何对本手册内容或使用的声明，无论是明示还是暗示，都不涉及关于内容完整性的保证，也不承诺商品质量。这份出版物仅限于在得到明确书面同意的情况下进行复制、打印、存储于检索系统或传输。Linux Foundation 是该文档的出版者，可以通过其官方网站 <https://www.linuxfoundation.org> 获取更多信息。因此，LFD259-labs 提供的是一种定制化的学习资源，旨在帮助开发者深入了解 Kubernetes 技术，并确保合法和合规的学习环境。它可能包含关于 Kubernetes 的基础概念、集群管理、服务部署、容器编排以及与之相关的最佳实践案例。通过深入的实验和实践，参与者能够提升自己在云计算领域的能力，并熟悉如何在实际项目中应用 Kubernetes。

12 CHAPTER 2. KUBERNETES ARCHITECTURE

3. View the details of the deployment, then the pod. Work through the output slowly. Knowing what a healthy deployment

and looks like can be helpful when troubleshooting issues. Again the Tab key can be helpful when using long auto-

generated object names. You should be able to type ﬁrstpodTab and the name will complete when viewing the pod.

student@ckad-1:~$ kubectl describe deployment firstpod

Name: firstpod

Namespace: default

CreationTimestamp: Fri, 25 Jul 2018 16:46:57 +0000

Labels: run=firstpod

Annotations: deployment.kubernetes.io/revision=1

Selector: run=firstpod

Replicas: 1 desired | 1 updated | 1 total | 1 available....

StrategyType: RollingUpdate

MinReadySeconds: 0

<output_omitted>

student@ckad-1:~$ kubectl describe pod firstpod-6bb4574d94-rqk76

Name: firstpod-6bb4574d94-rqk76

Namespace: default

Priority: 0

PriorityClassName: <none>

Node: ckad-1/10.128.0.2

Start Time: Wed, 25 Jul 2018 06:13:18 +0000

Labels: pod-template-hash=2660130850

run=firstpod

Annotations: <none>

Status: Running

IP: 192.168.200.65

Controlled By: ReplicaSet/firstpod-6bb4574d94

<output_omitted>

4. Note that the resources are in the default namespace. Get a list of available namespaces.

student@ckad-1:~$ kubectl get namespaces

NAME STATUS AGE

default Active 20m

kube-public Active 20m

kube-system Active 20m

5. There are two other namespaces. Look at the pods in the kube-system namespace.

student@ckad-1:~$ kubectl get pod -n kube-system

NAME READY STATUS RESTARTS AGE

calico-etcd-rvrpk 1/1 Running 1 20m

calico-kube-controllers-d554689d5-lm687 1/1 Running 1 20m

calico-node-2ck9g 2/2 Running 4 19m

calico-node-kkxvl 2/2 Running 3 20m

etcd-ckad-1 1/1 Running 1 20m

<output_omitted>

6. Now look at the pods in a namespace that does not exist. Note you do not receive an error.

student@ckad-1:~$ kubectl get pod -n fakenamespace

No resources found.

7. You can also view resources in all namespaces at once. Use the --all-namespaces options to select objects in all

namespaces at once.

student@ckad-1:~$ kubectl get pod --all-namespaces

NAMESPACE NAME READY STATUS RESTARTS AGE

default firstpod-6bb4574d94-rqk76 1/1 Running 0 5m

kube-system calico-etcd-z49kx 1/1 Running 0 31m

kube-system calico-kube-controllers-d554689d5-pfszw 1/1 Running 0 31m

<output_omitted>

8. View several resources at once. Note that most resources have a short name such as rs for ReplicaSet, po for Pod,

svc for Service, and ep for endpoint. Note the endpoint still exists after we deleted the pod.

student@ckad-1:~$ kubectl get deploy,rs,po,svc,ep

NAME READY UP-TO-DATE AVAILABLE AGE

deployment.extensions/firstpod 1/1 1 1 4m

NAME DESIRED CURRENT READY....

replicaset.extensions/firstpod-6bb4574d94-rqk76 1 1 1 ....

NAME READY STATUS RESTARTS AGE

pod/firstpod-6bb4574d94-rqk76 1/1 Running 0 4m

NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE

service/basicservice NodePort 10.108.147.76 <none> 80:31601/TCP 21m

service/kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 21m

NAME ENDPOINTS AGE

endpoints/basicservice <none> 21m

endpoints/kubernetes 10.128.0.3:6443 21m

9. Delete the ReplicaSet and view the resources again. Note that the age on the ReplicaSet and the pod it controls is

now less than a minute. The deployment controller started a new ReplicaSet when we deleted the existing one, which

started another pod when the desired conﬁguration did not match the current status.

student@ckad-1:~$ kubectl delete rs firstpod-6bb4574d94-rqk76

replicaset.extensions "firstpod-6bb4574d94-rqk76" deleted

student@ckad-1:~$ kubectl get deployment,rs,po,svc,ep

NAME READY UP-TO-DATE AVAILABLE AGE

deployment.extensions/firstpod 1/1 1 1 7m

NAME DESIRED CURRENT....

replicaset.extensions/firstpod-6bb4574d94-rqk76 1 1 ....

NAME READY STATUS RESTARTS AGE

pod/firstpod-7d99ffc75-p9hbw 1/1 Running 0 12s

NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE

service/kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 24m

NAME ENDPOINTS AGE

endpoints/kubernetes 10.128.0.2:6443 80m

endpoints/basicservice <none> 21m

10. This time delete the top-level controller. After about 30 seconds for everything to shut down you should only see the

cluster service and endpoint remain for the cluster and the service we created.

student@ckad-1:~$ kubectl delete deployment firstpod

deployment.extensions "firstpod" deleted

student@ckad-1:~$ kubectl get deployment,rs,po,svc,ep

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