June 2021
Intermediate to advanced
335 pages
5h 50m
Chinese
Content preview from Kubernetes编程
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10
｜
第
1
章
署到公有云部署）。另一方面，你还可以从
Kubernetes
清晰的声明式机制中
获益。
下面让我们一起来看一个实际的例子吧。
1.2
一个实际的例子
为了展示原生
Kubernetes
应用的强大魅力，让我们一起来实现一个
at
工具——
一个用于在指定时间运行指定命令的工具。
我们把这个例子叫为
cnat
，也就是“云原生
at
”（
Cloud-Native at
）的缩写，
其工作逻辑是：假如你想让
cnat
在
2019
年
7
月
3
日凌晨
2
点运行命令
echo
"Kubernetes native rocks!"
，你可以这样做：
$ cat cnat-rocks-example.yaml
apiVersion: cnat.programming-kubernetes.info/v1alpha1
kind: At
metadata:
name: cnrex
spec:
schedule:
“
2019-07-03T02:00:00Z
”
containers:
- name: shell
image: centos:7
command:
- "bin/bash"
- "-c"
- echo "Kubernetes native rocks!"
$ kubectl apply -f cnat-rocks-example.yaml
cnat.programming-kubernetes.info/cnrex created
在幕后，以下组件参与了工作：
•
一个名为
cnat.programming-kubernetes.info/cnrex ...
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