Kim-YongJin

const chromium = require('chrome-aws-lambda');
const { Cluster } = require('puppeteer-cluster');
const cluster = await Cluster.launch({
  concurrency: Cluster.CONCURRENCY_PAGE,
  maxConcurrency: 3,
  puppeteer: chromium.headless ? require('puppeteer-core') : require('puppeteer'),
  puppeteerOptions: {
    args: chromium.args,
    defaultViewport: chromium.defaultViewport,
    executablePath: await chromium.executablePath,

Kim-YongJin

const got = require("got");
async getRemoteFileSize(url) {
  const response = await got(url, { method: 'head' });
  const result = response.headers['content-length'];
  console.log(`Target size: ${result}`);
  return result
}

Kim-YongJin

const fs = require('fs');
function getLocalFileSize(filePath) {
  const stat = fs.statSync(filePath);
  const result = stat.size;
  console.log(`file size: ${result}`);
  return result
}

Kim-YongJin

const got = require("got");
const { createWriteStream } = require("fs");
const stream = require("stream");
const { promisify } = require("util");
const pipeline = promisify(stream.pipeline);

async function download(targetUrl, savePath) {
  const downloadStream = got.stream(targetUrl);
  downloadStream.on("downloadProgress", ({ transferred, total, percent }) => {
    const percentage = Math.round(percent * 100);

Kim-YongJin

Easy way to attach image files to Github and Gist

1. Scroll to comment window at page of Gist
2. Copy&Paste or Drag&Drop image files to comment window. Some of tag will be genarated as the following.
3. Use genarated tags.

Note: Please don't click "comment" button.

Kim-YongJin

Easy way to attach image files to Gist

Kim-YongJin

# Download sh
curl https://gist.githubusercontent.com/Kim-YongJin/55ebad68ab16a86c9643a411a29f70a9/raw/cd9415ac72458226c692d744f57b7d50d78dd3eb/cloudwatch-monitoring-memory-disk-for-ec2-linux.sh -O
# Run sh
. cloudwatch-monitoring-memory-disk-for-ec2-linux.sh
# Delete sh
rm cloudwatch-monitoring-memory-disk-for-ec2-linux.sh

Kim-YongJin

Step 1(permissions)

Ensure the permissions. It needs 4 permissions the following.

• cloudwatch:PutMetricData
• cloudwatch:GetMetricStatistics
• cloudwatch:ListMetrics
• ec2:DescribeTags

You can attach permittions using one of the following options.

• Associate an IAM role with your instance