Zhennan LI nanmu42

Let's make it happen.

nanmu42 / delete-k3s.md

Last active February 1, 2020 04:57

K3S Jumpstart

Run /usr/local/bin/k3s-uninstall.sh

nanmu42 / eck.yml

Last active November 8, 2019 10:41

Elastic Cloud + FluentBit on k8s (minisized deployment)

	apiVersion: elasticsearch.k8s.elastic.co/v1beta1
	kind: Elasticsearch
	metadata:
	namespace: elastic-system
	name: logging-eck
	spec:
	version: 7.4.2
	nodeSets:
	- name: default
	count: 1

nanmu42 / scanner_valuer.go

Created October 23, 2019 07:29

Golang SQL scanner and valuer example

	// QueryParams every key is a query param
	type QueryParams map[string]QueryParam

	// Scan satisfies SQL scanner interface
	func (q *QueryParams) Scan(src interface{}) error {
	b, ok := src.([]byte)
	if !ok {
	return errors.New("type assertion to []byte failed")
	}

nanmu42 / check_cert_valid_date.sh

Created August 30, 2019 05:58

Check valid date of certificate

echo | openssl s_client -servername www.github.com -connect www.github.com:443 2>/dev/null | openssl x509 -noout -dates

nanmu42 / geoOffset.go

Created August 21, 2019 08:28

计算从 (lon0, lat0) 经纬度（单位 °）移动 dx, dy 米后的新的经纬度

	// geoOffset 计算从 (lon0, lat0) 经纬度（单位 °）移动 dx, dy 米后的新的经纬度
	//
	// 这个算法在100km以内有良好精度。
	//
	// source: https://stackoverflow.com/questions/2839533/adding-distance-to-a-gps-coordinate
	func geoOffset(lon0, lat0, dx, dy float64) (lon, lat float64) {
	lon = lon0 + (180/math.Pi)(dx/6378137)/math.Cos(lat0/180math.Pi)
	lat = lat0 + (180/math.Pi)*(dy/6378137)

	return

nanmu42 / optimize_img.sh

Created August 5, 2019 03:48

Opitimize JPEG and PNG to a both smaller file size and resolution

	#!/usr/bin/env bash

	FOLDER=$1

	MAX_WIDTH=1400
	MAX_HEIGHT=1000

	# resize, strip metadata and save in a lower quality
	# aspect ratio will be kept.
	find ${FOLDER} $ -iname '.jpg' -o -iname '.jpeg' -o -iname '*.png' $ -exec convert \{} -verbose -strip -quality 75 -resize "${MAX_WIDTH}x${MAX_HEIGHT}>" \{} \;

nanmu42 / openinbrowser.go

Created May 20, 2019 09:43

Golang: Open URL in Browser

	func openBrowser(url string) {
	var err error

	switch runtime.GOOS {
	case "linux":
	err = exec.Command("xdg-open", url).Start()
	case "windows":
	err = exec.Command("rundll32", "url.dll,FileProtocolHandler", url).Start()
	case "darwin":
	err = exec.Command("open", url).Start()

nanmu42 / compress.sh

Last active May 16, 2019 05:00

ffmpeg compressing video for web browser

	#!/usr/bin/env bash
	# preset veryslow: more time for more compressing rate
	# -movflags +faststart optimizes for web browser so video can be played sooner.
	# crf: small = better quality + bigger size; sane option between 17–28

	SRC="$1"
	CRF="$2"

	ffmpeg -i "$SRC" -vcodec libx264 -crf "$CRF" -movflags +faststart -preset veryslow -profile:v high -level 4.1 web_libx264_crf_${CRF}_faststart_veryslow.mp4

nanmu42 / Dockerfile

Last active May 15, 2019 08:01

Docker loves Vue.js

	FROM node:10.15 as builder
	WORKDIR /project
	COPY . .
	RUN npm i && npm run lint && npm run build && rm -f dist/*/.map

	FROM nginx:stable
	# COPY copies folder content, not folder itself
	COPY --from=builder /project/dist /var/www
	COPY ./nginx.conf /etc/nginx/conf.d/default.conf

nanmu42 / Dockerfile

Last active July 27, 2023 10:18

Minimal-sized Golang Docker Image

	FROM golang:1-alpine as golang
	RUN apk --no-cache add git zip tzdata ca-certificates
	# avoid go path, use go mod
	WORKDIR /app
	COPY . .
	RUN CGO_ENABLED=0 go build -ldflags "-s -w -extldflags "-static"" ./cmd/appnamehere
	WORKDIR /usr/share/zoneinfo
	# -0 means no compression. Needed because go's
	# tz loader doesn't handle compressed data.
	RUN zip -r -0 /zoneinfo.zip .