Thomas Kindler virtualdreams

Create bootable USB

dd bs=4M if=/path/to/archlinux.iso of=/dev/sdx status=progress oflag=sync

Boot from USB and set prepare system

loadkeys <your-keymap>

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

$ diff -u /etc/nginx/nginx.conf{.ORIG,}
--- /etc/nginx/nginx.conf.ORIG  2014-04-13 04:15:51.907316500 +0000
+++ /etc/nginx/nginx.conf       2014-04-13 05:02:22.807316500 +0000
@@ -30,7 +30,9 @@
        # Logging Settings
        ##
 
-       access_log /var/log/nginx/access.log;
+ log_format vhosts '$host $remote_addr - $remote_user [$time_local] "$request" $status $body_bytes_sent "$http_referer" "$http_user_agent"';

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.

vimdiff cheat sheet

##git mergetool

In the middle file (future merged file), you can navigate between conflicts with ]c and [c.

Choose which version you want to keep with :diffget //2 or :diffget //3 (the //2 and //3 are unique identifiers for the target/master copy and the merge/branch copy file names).

:diffupdate (to remove leftover spacing issues)

:only (once you’re done reviewing all conflicts, this shows only the middle/merged file)

	package main

	import (
	"fmt"
	"net/http"
	"time"

	"golang.org/x/net/context"

	"github.com/husobee/backdrop"

	package main

	import (
	"flag"
	"io"
	"log"
	"net"
	"net/http"
	"strings"
	)

	server {
	listen *:80;

	root /usr/share/icingaweb2/public;
	access_log /var/log/nginx/ssl-icingaweb2_app.access.log;
	error_log /var/log/nginx/ssl-icingaweb2_app.error.log;

	location ~ ^/icingaweb2(.+)? {
	alias /usr/share/icingaweb2/public;
	index index.php

	/*
	This program is an adaptation of the Mandelbrot program
	from the Programming Rosetta Stone, see
	http://rosettacode.org/wiki/Mandelbrot_set

	Compile the program with:

	gcc -o mandelbrot -O4 mandelbrot.c

	Usage:

	# to generate your dhparam.pem file, run in the terminal
	openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048