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import struct, time
## This experiment demonstrates that the claimed "hash" (that is not a hash) used
## by the L2 cache ECC debug feature used by Operation Triangulation is not secure,
## and can be trivially reverse engineered by anyone who owns one of the machines
## with the hardware (such as any M1 Mac), in seconds to days. Therefore, this proves
## that no "insider" access or leak is necessary to obtain this table, and that the
## attackers most likely did exactly the same thing.
## This is the "black box", i.e. the hardware: The table is not exposed to the caller.
class BlackBox:
@chadaustin
chadaustin / colortest.rs
Created January 2, 2024 04:52
Detect Terminal Color and Character Attribute Support
#!/usr/bin/env -S rust-script -t nightly
#![feature(unix_sigpipe)]
use std::cmp::max;
const BASIC_COLORS: &[&str] = &[
"black", "red", "green", "yellow", "blue", "magenta", "cyan", "white",
];
fn title(t: &str) {
@braindevices
braindevices / #btrfs benchmark for daily used desktop OS
Last active June 5, 2024 14:51
which file sytem to use for daily work? should we turn on btrfs compression?
#btrfs benchmark for daily used desktop OS
@s3rj1k
s3rj1k / HowTo
Last active June 20, 2024 01:28
Ubuntu 20.04.3 AutoInstall
# For recent versions of Ubuntu:
- https://www.pugetsystems.com/labs/hpc/ubuntu-22-04-server-autoinstall-iso/
# Docs:
- https://wiki.ubuntu.com/FoundationsTeam/AutomatedServerInstalls
- https://wiki.ubuntu.com/FoundationsTeam/AutomatedServerInstalls/ConfigReference
- https://cloudinit.readthedocs.io/en/latest/topics/datasources/nocloud.html
- https://discourse.ubuntu.com/t/please-test-autoinstalls-for-20-04/15250/53
# Download ISO Installer:
@mcastelino
mcastelino / kcgroups.md
Last active April 12, 2024 08:58
Kubernetes and cgroups Resource Management/Static cpuManagerPolicy/Memory and Resource Isolation & Scheduling

Overview

The goal of this document to cover all aspects of Kubernetes management, including how resources are expressed, constrained and accounted for. This started a way to ensure that alternate container runtime implementation like Kata containers will behave from a resource accounting and consumption point of view in the same manner as runc.

Location of the latest version of this document: https://gist.github.com/mcastelino/b8ce9a70b00ee56036dadd70ded53e9f

If you do not understand cgroups please refer to a quick primer at the bottom of this document. This will help you understand how the resource enforcement actually works.

Kubernetes Resource Management

@pedroxs
pedroxs / jq-filters.sh
Last active January 22, 2024 13:02
jq - recursive search for keys containing "string" stripping empty results
# recursive search for keys containing "string" stripping empty results
jq '.. | objects | with_entries(select(.key | contains("ftp"))) | select(. != {})'
# same, but output propper array
jq '[ .. | objects | with_entries(select(.key | contains("ftp"))) | select(. != {}) ]'
# or
jq 'map( .. | objects | with_entries(select(.key | contains("ftp"))) | select(. != {}) )'
# transform input from {type: a, amount: 1} to {a: 1} and sum all values by type
jq '[ .[] | {(.type): .amount} ] | map(to_entries) | add | group_by(.key) | map({key: .[0].key, value: map(.value) | add}) | from_entries'
@juliohm1978
juliohm1978 / k8s-drain.sh
Last active March 13, 2024 14:12
Drains a Kubernetes node using "rollout restart" instead "kubectl drain". See comments for motiviation and usage.
#!/bin/bash
NODE_NAME=$1
ROLLOUT_CMD=$2
if [[ "$NODE_NAME" == "" ]]; then
echo "
USAGE: ./drain.sh <NODE_NAME>
Drains a node from its Deployments/Stateful set pods.
@soellman
soellman / easy-k8s-coreos.md
Last active July 22, 2019 14:10
Easy Kubernetes on CoreOS

Easy Kubernetes Installation on CoreOS

At Timeline Labs, we are continuously looking at new technologies to see what fits our needs. We are especially excited about Kubernetes from Google to manage our services atop Docker and CoreOS.

This process for installing Kubernetes on CoreOS uses Flannel for Kubernetes networking and should be cloud provider agnostic. To deploy the Kubernetes master functionality into the cluster, it uses fleetctl.

Thanks to Kelsey Hightower and his blog posts! They served as a great starting point for this process.

How do I get this running?

Add the cloud config below to your own and bring up your cluster using a CoreOS version with Docker 1.3 (currently v472.0.0 in alpha). During that initial boot, the download-kubernetes and download-flannel units will download binaries from the latest project release and use those.

@soarez
soarez / ca.md
Last active June 19, 2024 19:32
How to setup your own CA with OpenSSL

How to setup your own CA with OpenSSL

For educational reasons I've decided to create my own CA. Here is what I learned.

First things first

Lets get some context first.

@KartikTalwar
KartikTalwar / Documentation.md
Last active June 13, 2024 07:02
Rsync over SSH - (40MB/s over 1GB NICs)

The fastest remote directory rsync over ssh archival I can muster (40MB/s over 1gb NICs)

This creates an archive that does the following:

rsync (Everyone seems to like -z, but it is much slower for me)

  • a: archive mode - rescursive, preserves owner, preserves permissions, preserves modification times, preserves group, copies symlinks as symlinks, preserves device files.
  • H: preserves hard-links
  • A: preserves ACLs