darcy wilkice

yum

yum install --downloadonly --downloaddir=./yum-packages tree

last modified date auto update

`last_update` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,

show db disk usage

select table_schema, sum((data_length+index_length)/1024/1024) AS "Total size(table+index) Mb", sum(data_length/1024/1024) as "table size", sum(index_length/1024/1024) as "index size" from information_schema.tables group by table_schema;

16 进制需要先转为 10 进制的 byte，然后 byte 和 str 相互转换

Python

# ascii str to hex str
"hello".encode().hex()  # '68656c6c6f'

# hex str to ascii
bytes.fromhex("68656c6c6f").decode()  # "hello"

摘要算法: 返回固定长度的字符串

md5: 128 bit

SHA-1: 160 bit

SHA-2(SHA-256): 256 bit, 64 hex

加密算法

VsCode 本身对于 Markdown 编写来说是足够的，但是没有办法直接插入图片。在这里分享我最近查找到的一种方式，主要是利用 vs-picgo 这个插件来实现的，图片保存在了腾讯云的 COS 中。

Vscode 设置中插件的配置类似为

{
    "picgo.picBed.tcyun.appId": "xxx",
    "picgo.picBed.tcyun.secretId": "xxxx",
    "picgo.picBed.tcyun.secretKey": "xxxx",
    "picgo.picBed.current": "tcyun",
 "picgo.picBed.tcyun.area": "ap-guangzhou",

three parts

Major.Minor.Patch

increment Major if make backward incompatible changes. increment Minor if make backward compatible changes, specially functionality not bug fix. increment Patch if make bug fix not affecting anything.

If version is released, you can't change it. You should make a new release if there is something to change.

	# get k3s and disable traefik
	curl -sfL https://get.k3s.io \| K3S_KUBECONFIG_MODE="644" INSTALL_K3S_EXEC="--disable=traefik" sh -

	# install helm
	curl https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3 \| bash

	# install nginx ingress: https://kubernetes.github.io/ingress-nginx/deploy/#quick-start
	helm upgrade --install ingress-nginx ingress-nginx \
	--repo https://kubernetes.github.io/ingress-nginx \
	--namespace ingress-nginx --create-namespace

	package main

	import (
	"fmt"
	"strconv"
	"encoding/hex"
	)
	func main() {

	// "A"

	package main

	import (
	"log"
	"os/exec"
	)

	func main() {
	cmd := exec.Command("aaa", "-za")
	output, err := cmd.CombinedOutput()