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Setup nut and netdata on Ubuntu

In this document, I will explain how to setup nut (Network UPS Tools) on Ubuntu 18.04 and 20.04.

It is basically the next chapter of my previous gist, Upgrade nut on Ubuntu 18.04.

I'll only document USB connected UPS and not the other supported connection modes.

Install required dependencies

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The Problem

usb0 interface is DOWN.

Solution Part 1

Create a new connection: In /etc/network/interfaces.d/usb0.conf, write

allow-hotplug usb0
iface usb0 inet static
 address 192.168.7.2

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"""
The most atomic way to train and run inference for a GPT in pure, dependency-free Python.
This file is the complete algorithm.
Everything else is just efficiency.

@karpathy
"""

import os       # os.path.exists
import math     # math.log, math.exp

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#!/bin/bash

# Set script to exit on error
set -e

# Enable logging
exec > >(tee -i /var/log/setup-script.log)
exec 2>&1

echo "Starting script execution..."

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installing HPE StoreOpen Software for RHELx64 to Ubuntu 20.04.2 LTS.

Reference: https://rabbit-note.com/2020/01/12/ubuntu-ltfs/

Get SOS_RHELx64 rpm

https://h20392.www2.hpe.com/portal/swdepot/displayProductInfo.do?productNumber=SOS_RHELx64

$ ls

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MCP2221

• MCP2221
  • Infos
  • I2C Setup
    • Test
  • CircuitPython Libraries on any Computer with MCP2221
    • Setup
      • Test setup
  • SparkFun CCS811/BME280 Combo Board

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nmcli con add \
  type wifi \
  con-name "eduroam"
  ifname "wlp4s0" \ # Your wifi interface
  ssid "eduroam" \
  wifi-sec.key-mgmt "wpa-eap" \
  802-1x.identity "<YOUR-STUDENT-ID>@lu.se" \ # May also use another university identification
  802-1x.password "<YOUR-PASSWORD" \
  802-1x.system-ca-certs "yes" \
  802-1x.domain-suffix-match "radius.lu.se" \

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Memory profiling Rust code with heaptrack in 2019

I recently ran into a classic case of "our code is using way more memory than it should". So I took my first dive into memory profiling Rust code. I read several posts about this, including the following

• KodrAus' gist on profiling rust
• This reddit thread
• Brendan D. Gregg's post about memory flamegraphs
• Bradlee Speice's A Case Study in Heaptrack

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Change frame rate (25 FPS to 23.976 FPS)

$ ffmpeg -y -i INPUT -vf "setpts=25025*PTS/24000" -r 23.976 -af atempo=24000/25025 OUTPUT

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Git Tidbits

Removing files in post after changing .gitignore

$ git rm --cached `git ls-files -i -c --exclude-from=.gitignore`