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@nanmu42
nanmu42 / delete-k3s.md
Last active February 1, 2020 04:57
K3S Jumpstart

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

@nanmu42
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
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
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
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(lat0/180*math.Pi)
lat = lat0 + (180/math.Pi)*(dy/6378137)
return
@nanmu42
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
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
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
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
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 .