vladborovtsov

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

vladborovtsov

-- ddcavcontrol

-- v1.2.1

-- This Hammerspoon script is intended to do the following:
-- 1) Control External Display Brightness via DDC (utilizing a proper brightness+contrast curve)
-- 2) Control External Display Volume via DDC
-- 3) Control Digital AV Volume via Network (currently works with Yamaha AVs)
-- 4) Use the standard brightness and volume keys of an Apple keyboards
-- 5) Display the standard MacOS OSD as expected

vladborovtsov

//
//  NSImage+OpenCV.h
//

#import <AppKit/AppKit.h>

@interface NSImage (NSImage_OpenCV) {

}

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[program:mongodb]
command=/opt/mongodb/bin/mongod --dbpath /storage/mongodb_data --rest
directory=/opt/mongodb
user=root
autostart=false

vladborovtsov

#MongoDB 3.2.x Replica Sets on AWS EC2 A MongoDB replica set provides a mechanism to allow for a reliable database services. The basic replica set consists of three servers, a primary, a secondary and an arbitrator. The primary and secondary both hold a copy of the data. The arbitrator is normally a low spec server which just monitors the other servers and help with the failover process. In production, there can be more than three servers.

To setup mongo as a replica set on Amazon Web Services EC2 you need to first setup a security group with ssh on port 22 and mongodb on port 27017. You then need to create three servers. Select Ubuntu 14.04 LTS x64 and a micro (or bigger depending on your database size, ideally you should have enough memory to match your database size) instance for the primary and secondary and a nano instance for the arbitrator.

##Adjust the File System on each Server The operating system by default will update the last access time on a file. In a high data throughput database application

vladborovtsov

# You don't need Fog in Ruby or some other library to upload to S3 -- shell works perfectly fine
# This is how I upload my new Sol Trader builds (http://soltrader.net)
# Based on a modified script from here: http://tmont.com/blargh/2014/1/uploading-to-s3-in-bash

S3KEY="my aws key"
S3SECRET="my aws secret" # pass these in

function putS3
{
  path=$1

vladborovtsov

openssl req -new -newkey rsa:2048 -nodes -keyout yourdomain.key -out yourdomain.csr

http://support.godaddy.com/help/article/3601/generating-a-certificate-signing-request-nginx
http://support.godaddy.com/help/article/4976/rekeying-an-ssl-certificate

# Be sure to remember to chain them!
cat gd_bundle-g2-g1.crt >> yourdomain.crt

# Move 'em
sudo mv yourdomain.crt /etc/ssl/certs/yourdomain.crt

vladborovtsov

tmux cheatsheet

As configured in my dotfiles.

start new:

tmux

start new with session name:

vladborovtsov

import os
from PIL import Image


def extractFrames(inGif, outFolder):
    frame = Image.open(inGif)
    nframes = 0
    while frame:
        frame.save( '%s/%s-%s.gif' % (outFolder, os.path.basename(inGif), nframes ) , 'GIF')
        nframes += 1

vladborovtsov

from django.db import connections
from django.db.models.query import QuerySet
from __future__ import print_function

class QuerySetExplainMixin:
    def explain(self, analyze=True):
        cursor = connections[self.db].cursor()
        print(self.query)
        print()
        sql, params = self.query.sql_with_params()