khimaros khimaros

This configuration is not maintained anymore. You should think twice before using it, Breaking change and security issue will likely eventually happens as any abandonned project.

How to mount a qcow2 disk image

This is a quick guide to mounting a qcow2 disk images on your host server. This is useful to reset passwords, edit files, or recover something without the virtual machine running.

Step 1 - Enable NBD on the Host

modprobe nbd max_part=8

security and hardening options for systemd service units

A common and reliable pattern in service unit files is thus:

NoNewPrivileges=yes
PrivateTmp=yes
PrivateDevices=yes
DevicePolicy=closed
ProtectSystem=strict

Container security notes

Internet references

Kernel and architecture

namespaces - overview of Linux namespaces http://man7.org/linux/man-pages/man7/namespaces.7.html
mount_namespaces - overview of Linux mount namespaces

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD

	#!/usr/bin/env sh

	# Download lists, unpack and filter, write to stdout
	curl -s https://www.iblocklist.com/lists.php \
	\| sed -n "s/.value='\(http:.=bt_.\)'./\1/p" \
	\| xargs wget -O - \
	\| gunzip \
	\| egrep -v '^#'

	package astar

	import "container/heap"

	type NodeQueue []Node

	func NewNodeQueue() NodeQueue {
	return make(NodeQueue, 0, 1000)
	}

	#!/usr/bin/env python
	# -- coding=utf8 --
	"""
	nginx-ldapauthd
	===============

	A backend for the nginx auth_request module.

	* Listens on unix socket (SOCK_NAME) and authenticates users against LDAP
	* Two modes:

	# coding: utf-8
	# by Joao Bueno
	from random import randrange, choice
	import pygame

	FR = 30
	SIZE = 640, 480
	BGCOLOR = (255,255,255)
	NODECOLOR = (255,0,0)
	NODESIZE = 10,10

	#!/bin/bash
	#

	BACKUPDEST="$1"
	DOMAIN="$2"
	MAXBACKUPS="$3"

	if [ -z "$BACKUPDEST" -o -z "$DOMAIN" ]; then
	echo "Usage: ./vm-backup <backup-folder> <domain> [max-backups]"
	exit 1