Niclas Zellerhoff niclaszll

CPU: percentage of limit

A lot of people land when trying to find out how to calculate CPU usage metric correctly in prometheus, myself included! So I'll post what I eventually ended up using as I think it's still a little difficult trying to tie together all the snippets of info here and elsewhere.

This is specific to k8s and containers that have CPU limits set.

To show CPU usage as a percentage of the limit given to the container, this is the Prometheus query we used to create nice graphs in Grafana:

sum(rate(container_cpu_usage_seconds_total{name!~".*prometheus.*", image!="", container_name!="POD"}[5m])) by (pod_name, container_name) /

Eslint and prettier config for nodejs and express projects

Eslint and Libs

You need to install eslint and some other config libs.

yarn add eslint prettier eslint-config-prettier eslint-plugin-prettier -D

yarn eslint --init

.eslintrc.js

Traefik: redirect base or root path to a subpath

This is tested with Traefik 1.7

This is how to redirect the root or base path to a sub path in Traefik using Docker labels:
Goals

https://example.com -> https://example.com/abc/xyz/
https://example.com/ -> https://example.com/abc/xyz/
https://example.com/something -> no redirect

Windows SSH Setup

The steps to enable both SSH and tunneling/port forwarding are as follows:

Open Settings > Update and Security > For Developers.
Click on the radio button for Developer mode; this will open up your system's port 22 and allow the SSH broker to start listening for incoming connections.
If you just switched to Developer mode, restart your computer, and then follow step 1 again.
Under Device discovery turn on the option labeled Make your device visible to USB connections and your local network.
Under Device discovery turn on the option labeled User OpenSSH (Beta) server for remote deployment.

	const io = require('socket.io-client');

	const socket = io('http://localhost:3000', {
	transportOptions: {
	polling: {
	extraHeaders: {
	'Authorization': 'Bearer abc',
	},
	},
	},