aemitos

tmux shortcuts & cheatsheet

Command
start new	tmux
start new with session name	tmux new -s myname
attach	tmux a # (or at, or attach)
attach to named:	tmux a -t myname
list sessions	tmux ls

aemitos

PostgreSQL JSON Cheatsheet

Using JSON in Postgres by examples. The beuaty to be some schema-less over a schema-full database and still be as fast as a NoSQL document based database.

Quick setup via Docker

1. Download and install: Docker Toolbox
2. Open Docker Quickstart Terminal
3. Start a new postgres container:
   docker run --name my-postgres -e POSTGRES_PASSWORD=mysecretpassword -d postgres

aemitos

# Siraj Guide

# Learn_Blockchain_in_2_months
This is the code for "Learn Blockchain in 2 Months" by Siraj Raval on Youtube 


## Overview

This is the code for [this]() video on Youtube by Siraj Raval on Learning Blockchain in 2 Months.

aemitos

In some cases that your HDFS fails and you need to recreate the OpenTSDB schema on HBase. To remove the tables use the commands below.

```
root@hb-node4:/# hbase zkcli
ls /hbase  
[replication, meta-region-server, rs, splitWAL, backup-masters, table-lock, flush-table-proc, region-in-transition, online-snapshot, master, running, recovering-regions, draining, namespace, hbaseid, table]
rmr /hbase/table/tsdb
rmr /hbase/table/tsdb-uid
rmr /hbase/table/tsdb-meta
rmr /hbase/table/tsdb-tree

aemitos

cd /home/tim/VirtualBox\ VMs/
mv proxydev2_1351794515 tmp
mkdir proxydev2_1351794515
sudo mount -t tmpfs -o size=10G tmpfs /home/tim/VirtualBox\ VMs/proxydev2_1351794515 
cp -a tmp/* proxydev2_1351794515/

# go back to vagrant directory and `vagrant up`

aemitos

from Crypto.Cipher import AES
import base64
import os

# the block size for the cipher object; must be 16, 24, or 32 for AES
BLOCK_SIZE = 32

# the character used for padding--with a block cipher such as AES, the value
# you encrypt must be a multiple of BLOCK_SIZE in length.  This character is
# used to ensure that your value is always a multiple of BLOCK_SIZE

aemitos

#!/bin/bash
# https://httpd.apache.org/docs/2.2/misc/password_encryptions.html

HTPASSWD=$1
USERNAME=$2
PASSWORD=$3

ENTRY=`cat $HTPASSWD | grep "^$USERNAME:"`
HASH=`echo $ENTRY | cut -f 2 -d :`
SALT=`echo $HASH | cut -f 3 -d $`

aemitos

"""
Async Tornado S3 uploader with AWS4 sign.
https://gist.github.com/stalkerg/63bad3ea49be6268df49

Edited by @nanvel 2015-07-24

Usage example:

.. code-block:: python

aemitos

#!/usr/bin/python
# -*- coding: utf-8 -*-

# Copyright 2011-2013 Everything.me. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without modification, are
# permitted provided that the following conditions are met:
#
#   1. Redistributions of source code must retain the above copyright notice, this list of
#      conditions and the following disclaimer.

aemitos

import hashlib, hmac, mimetypes, os, time

from base64 import b64encode, b64decode
from calendar import timegm
from datetime import datetime
from email.utils import formatdate
from urllib import quote

from tornado.gen import coroutine, Return
from tornado.httpclient import AsyncHTTPClient, HTTPError