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纯sql实现mysql计算两个时间的时间间隔，排除周末。其实就是计算工作日的实际用时（这里不涉及节假日）。

实现思路

假设起始时间是 start_time, 结束时间是 end_time

将起始时间到结束时间这个时间窗口分成四部分

• 完整的x周(x>=0)
• 一周内的天数
• 起始时间到起始日期那天24点的用时

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Mac Useful Command

Reference: https://www.youtube.com/watch?v=qOrlYzqXPa8

Say

Say some text by tts.

say "xxx"

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kubectl-node-shell

Intro

Reference: https://github.com/kvaps/kubectl-node-shell

Usage: ./kubectl-node-shell <node-name>

Code

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kubectl exec as root

Intro

Reference: https://github.com/jordanwilson230/kubectl-plugins

Principle: Create a ssh-pod with /var/run/docker.sock mounted. Then exec target pod through the ssh-pod which has docker privilege.

Usage: ./kubectl-exec-as-root <pod-name> -- bash

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Flask server demo

Install requirements.

pip3 install flask
pip3 install fkask-cors

Download the ipynb file below

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Create Root CA (Done once)

Create Root Key

Attention: this is the key used to sign the certificate requests, anyone holding this can sign certificates on your behalf. So keep it in a safe place!

openssl genrsa -des3 -out rootCA.key 2048