Cardano (ADA) intro

Getting to know about Cardano is a good idea. It’s a third-gen crypto currency which solves so many of the problems which are inside the bitcoin blockchain. MOTIVATION Cardano is a project that began in 2015 as an effort to change the way cryptocurrencies are designed and developed. The overall focus beyond a particular set […]


Just what is the ripple crypto currency, and how is it so different from the others? To start with, let’s ignore the technical differences, just jump to the business ones. Ripple is both a company and an open source crypto currency. The plan for both is to work with the banks to speed up wire […]

Ethereum & Ether, what’s the difference?

Let’s start with the basics, Ether is the crypto currency, which runs on the Ethereum Blockchain. Other things also run on the Ethereum blockchain too, like the crypto kitties game for example.

Bitcoin Memcache

Just what is the Bitcoin memcache? The memcache is where transactions are stored before they can be committed to the blockchain. When you set transaction fees too low, they can get stuck for a very long time in the memcache. Mining computers can choose what transactions they want to process, and they choose the ones […]

high disk watermark exceeded on one or more nodes – elasticsearch

When starting elasticsearch many┬ápeople are getting the following error message “high disk watermark exceeded on one or more nodes”.   This is a message from elasticsearch, which by default comes up when the drive containing your elasticsearch index is more than 90% full. It’s not related to the size of the elasticsearch index, just the […]

21 handy elasticsearch queries

Elasticsearch is a powerful, fast and surprisingly user freindly data store and search tool. It’s not quite a database and it’s not quite a search engine, elasticsearch sits somewhere comfortably in between. For these examples, we’ll store some domain names, Ip addresses and related information as that is a lot more fun than traditional bookstore […]

ORM for nodej – Waterlinejs, knex or squelizejs, bookshelf or objection?

Choosing how you connect to a database through nodejs can make a big difference both in development time, security, stability and data integrity. What you’re looking for in an ORM (Object-relational mapping) tool depends of course on your project needs. In this post we’ll go over the major ORM tools for nodejs and help you […]

Glimmer – Ember Backend now standalone

Fast and light-weight UI components for the web. Quickstart: Quickstart Install the Ember build tool: yarn global add ember-cli/ember-cli Create a new Glimmer app: ember new my-app -b @glimmer/blueprint Start the development server cd my-app/ && ember s

elasticsearch curl query examples

A quick way to get results from elasticsearch, test your queries and make sure your data is being indexed correctly is to fire off some queries from the command line. Using curl, you can get this going quickly. View all your elasticsearch indices: curl -XGET http://localhost:9200/_cat/indices?v A quick search across all indices: curl -XGET http://localhost:9200/_search/?q=foo […]