jforge

FROM ubuntu:16.04

RUN \
  sed -i 's/# \(.*multiverse$\)/\1/g' /etc/apt/sources.list && \
  apt-get update && \
  apt-get -y upgrade && \
  apt-get install -y build-essential curl && \
  apt-get install -y software-properties-common && \
  curl -sL https://deb.nodesource.com/setup_8.x | bash - && \
  apt-get install -y nodejs

jforge

Calculate the rolling standard deviation of a time series

Python + Pandas:
https://stackoverflow.com/questions/27427618/how-can-i-simply-calculate-the-rolling-moving-variance-of-a-time-series-in-pytho

R:
https://campus.datacamp.com/courses/manipulating-time-series-data-with-xts-and-zoo-in-r/apply-and-aggregate-by-time?ex=11
https://cran.r-project.org/web/packages/PerformanceAnalytics/PerformanceAnalytics.pdf

Node.js:

jforge

#!/bin/bash
# Sometimes you need to move your existing git repository
# to a new remote repository (/new remote origin).
# Here are a simple and quick steps that does exactly this.
#
# Let's assume we call "old repo" the repository you wish
# to move, and "new repo" the one you wish to move to.
#
### Step 1. Make sure you have a local copy of all "old repo"
### branches and tags.

jforge

Working with ansible-vault

---

I've been using a lot of Ansible lately and while almost everything has been great, finding a clean way to implement ansible-vault wasn't immediately apparent.

What I decided on was the following: put your secret information into a vars file, reference that vars file from your task, and encrypt the whole vars file using ansible-vault encrypt.

Let's use an example: You're writing an Ansible role and want to encrypt the spoiler for the movie Aliens.

jforge

#!/usr/bin/env node
// Minimal example of loading a PEM certificate using pkijs (in node)

// babel-polyfill needs to be loaded for pkijs
// It uses webcrypto which needs browser shims
require('babel-polyfill')

const Pkijs = require('pkijs')
const Asn1js = require('asn1js')
const FS = require('fs')

jforge

const fs = require('fs')
const path = require('path')
const process = require('process')
const { spawnSync } = require('child_process')

const { GITHUB_TOKEN, GITHUB_USERNAME, GITHUB_EMAIL } = process.env
// leaving this without https:// in order to reuse it when adding the remote
const gitRepositoryURL = 'github.com/owner/repo-name.git'
const repositoryName = 'repo-name'

jforge

Pushing to Multiple Git Repos

If a project has to have multiple git repos (e.g. Bitbucket and Github) then it's better that they remain in sync.

Usually this would involve pushing each branch to each repo in turn, but actually Git allows pushing to multiple repos in one go.

If in doubt about what git is doing when you run these commands, just

jforge

# The upcoming curl release enables MQTT support by default
# It still has several limitations, that might be show stoppers in most MQTT environments, but it basically works.
# Major requirement for me is following the server-side security-first directive: at least simple authentication + basic TLS 1.2+ support.
# My conclusion here is to keep using the mosquitto_pub/sub tools, when doing such stuff in a terminal window.
# (and of course to try to support the respective curl contributions ;-))

# 1.) Building curl master 
# - git clone https://github.com/curl/curl.git
# - Follow the guide: https://github.com/curl/curl/blob/master/GIT-INFO
autoreconf -fi

jforge

var Thread = Java.type("java.lang.Thread");
var Instant = Java.type("java.time.Instant");

var topic = "cybus/machine/1CY816L0ⓥ3/lastMovement";

function execute(action) {
  out("Test Script: " + action.getName());
  for (var i = 0; i < 1000; i++) {
    randomTimeSeriesPing();
    Thread.sleep(2000);

jforge

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/recognize-expanded-volume-linux.html#extend-linux-volume-partition

[ec2-user ~]$ df -h
Filesystem      Size  Used Avail Use% Mounted on
devtmpfs        1.9G     0  1.9G   0% /dev
tmpfs           2.0G     0  2.0G   0% /dev/shm
tmpfs           2.0G  740K  2.0G   1% /run
tmpfs           2.0G     0  2.0G   0% /sys/fs/cgroup
/dev/nvme0n1p1   16G   16G  166M  99% /
tmpfs           390M     0  390M   0% /run/user/1000