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Permissions for ssh/id_rsa

Case 1

git clone git@gitlab.com:....git

fails with:

Permissions 0644 for '/root/.ssh/id_rsa' are too open.

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PM2

https://pm2.keymetrics.io/docs/usage/startup/

npm install -g pm2@latest
pm2 startup

Saving current process list

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How To Install Node.js on Debian 10

https://www.digitalocean.com/community/tutorials/how-to-install-node-js-on-debian-10 https://www.digitalocean.com/community/tutorials/how-to-set-up-time-synchronization-on-debian-10

cd ~
curl -sL https://deb.nodesource.com/setup_12.x -o nodesource_setup.sh
sudo bash nodesource_setup.sh
sudo apt install nodejs
node -v

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Deploy nodejs app with gitlab.com and pm2

This manual is about setting up an automatic deploy workflow using nodejs, PM2, nginx and GitLab CI. It is tested on:

• Target server: Ubuntu 16.04 x64. This is suitable for Ubuntu 14.x.
• Windows 10 on my PC to work.

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Get access to localhost database from docker container

• Run containerized application on 0.0.0.0 address
• Use host.docker.internal as database hostname

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Tiny Library for Basic but Precise Arithemetic

For when you don't want 0.1 + 0.2 to equal 0.30000000000000004 use https://github.com/nefe/number-precision

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Get image width and height with JavaScript

function imageSize (image) {
  return new Promise((resolve, reject) => {
    try {
      const fileReader = new FileReader()

      fileReader.onload = () => {
 const img = new Image()

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# post_loc.txt contains the json you want to post
# -p means to POST it
# -H adds an Auth header (could be Basic or Token)
# -T sets the Content-Type
# -c is concurrent clients
# -n is the number of requests to run in the test

ab -p post_loc.txt -T application/json -H 'Authorization: Token abcd1234' -c 10 -n 2000 "http://example.com/api/v1/locations/"

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Lack of of file descriptors; Too many open files; Mac OS;

Mac OS X Catalina

Issue:

ab -c 300 -n 1000 https://super.com/api

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Auto update application build version. Husky pre-commit hook.

package.json

"husky": {
    "hooks": {
      "pre-commit": "npm run build && node ./update-build.js"
    }
  }