onlurking

Programming as Theory Building

Peter Naur

Peter Naur's classic 1985 essay "Programming as Theory Building" argues that a program is not its source code. A program is a shared mental construct (he uses the word theory) that lives in the minds of the people who work on it. If you lose the people, you lose the program. The code is merely a written representation of the program, and it's lossy, so you can't reconstruct

oliverspryn

#!/bin/bash

# Example Definitions, for Mac Setups
destination="$HOME/android/"
toolsDownloadUrl=$(curl https://developer.android.com/studio | grep -o "https:\/\/dl.google.com\/android\/repository\/commandlinetools\-mac\-[0-9]*_latest\.zip")

# Download and extract the contents
curl --location -o android.zip $toolsDownloadUrl
unzip -q android.zip -d ./android-temp

seanh

Netrw Cheatsheet (Vim's File Browser)

See also:

• vinegar.vim, which makes - open netrw in the directory of the current file, with the cursor on the current file (and pressing - again goes up a directory). Vinegar also hides a bunch of junk that's normally at the top of netrw windows, changes the default order of files, and hides files that match wildignore.

  With vinegar, . in netrw opens Vim's command line with the path to the file under the cursor at the end of the command. ! does the same but also prepends ! at the start of the command. y. copies the absolute path of the file under the cursor. ~ goes to your home dir. Ctrl+6 goes back to the file (buffer) that you had open before you opened netrw.

To launch netrw:

nhtua

#!/bin/bash -i
#using shebang with -i to enable interactive mode (auto load .bashrc)

set -e #stop immediately if any error happens

# Install Open SDK
apt update
apt install openjdk-8-jdk -y
update-java-alternatives --set java-1.8.0-openjdk-amd64
java -version

fl64

Kubernetes

Books / Links

• Kubernetes in Action, Marko Lukša En, Ru

• Core Kubernetes, Jay Vyas and Chris Love En, Ru

• Kubernetes Programming with Go En

• Docs: https://kubernetes.io/docs/home

• Dev docs: https://github.com/kubernetes/community/tree/master/contributors/devel

varhub

Android - Enable ADB from recovery

Credits to @TheOnlyAnil-@Firelord[^stackoverflow]

• Requirements: a) stock recovery + rooted phone b) custom recovery

• Files changed:

Kerryliu

UGREEN DXP4800 Plus TrueNAS Status LED Guide

The following is a quick guide on getting basic status LED functionality working with TrueNAS running on the UGREEN DXP4800 Plus. Theoretically, it should work on all models (with some small revisions to the script), but I only have a DXP4800 Plus. :)

This guide is for cron job that runs a script to update the LEDs every couple minutes, but I'm sure the following can be modified for blinky LEDs as well.

Steps:

itzmeanjan

Background

I'm demonstrating following on a machine, running Ubuntu 22.04 with GNU/Linux kernel 5.19.0.

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 22.04.2 LTS
Release:	22.04

iamwildtuna

Meta (Instagram, Facebook)
// Узлы
157.240.253.174, 157.240.253.172, 157.240.253.167, 157.240.253.63, 157.240.253.32
157.240.252.174, 157.240.252.172, 157.240.252.167, 157.240.252.63, 157.240.252.38
57.144.112.34, 57.144.110.1, 157.240.205.174, 87.245.223.97

// Подсети
213.102.128.0/24
204.15.20.0/22
199.201.0.0/16

max-rocket-internet

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) /