Reproducible Builds vs Semantic Versioning

Today, the most common way for developers to address a dependency is through the use of semantic versioning. This is where you create project A that depends on B at 1.2.3, where 1 is the major version, 2 is the minor version and 3 is the patch version.…

REST Composition & Aggregation

REST is a protocol used commonly for web APIs. It generally means each resource is identified using a a URL path like /resource1. Each of the resource end points supports a RESTful operations that is: GET POST PUT PATCH DELETE. A common problem occurs is when the client needs to…

Declarative Stateless Migrations in Databases

Ever since we read Domen Kožar's thoughts on how Nix and NixOS is a superior configuration management system because it features: Declarative Semantics Stateless Deterministic (pure) Avoids dependency hell Idempotent Atomic/Transactional Reversible or Rollbacks We've been thinking about how to apply the Nix philosophy to live database migrations. (Specifically…

Data Center Operating Systems

Matrix AI is maintaining a list of Orchestration platforms, DevOps tools, Distributed Schedulers, Cloud Operating Systems, almost all of them in one place! Check it out at http://datacenteroperatingsystem.io/ There's a lot more out there, so feel free to submit a pull-request. All of these competing solutions arise from…

Functionally Composing Service Oriented Architecture

How do you manage service oriented architecure (SOA) when your services are at differing levels of maturity? We encountered that question at the CTO summit in Sydney. It turns out, that we can use the lens architecture as model to understand this problem and what the possible solutions are: The…

Docker, Rockets, Mesos and Atlas

It's an exciting time in the infrastructure orchestration/automation space. The technologies are moving fast, but here are the interesting things we've observed in the past week: Docker & Rocket Controversy Docker has moving ahead extending their platform with tools such as: Docker Machine - Basically configuration management (CM) for…

Distributed Lens Architecture

There is a problem that is common to databases, user interface, programming languages and pretty much everything that involves state in more than 1 location. It's called the "view update problem". Or in a more general sense: (Bidirectional) Model Transformation. In the functional programming world, this is modelled…

Creating Domain Specific Languages with OMeta

I've been researching different ways of constructing the Forge Architect DSL. There are tons of different tools and different algorithms used to lex, tokenise, and evaluate context free languages: LL LR (LALR and SLR) Recursive Descent PEG Earley I found OMeta early on, and after reading Alessandro Warth's PHD dissertation,…

Reification & Abstraction in Configuration Management

Reification and abstraction are 2 fundamental concepts on computer programming and how humans communicate in general. These 2 concepts are also guiding the development of the Forge Architect orchestration language. Abstraction is the process of creating an construct that captures the essence of that which is concrete. It can be…

Configuration Management Language

The term configuration management has a long history beyond software development. When applied to software, people usually refer to the implementations of: CFEngine Puppet Chef Ansible Salt Docker Kubernetes Terraform Fleet And lots more... In a nutshell, configuration management in software refers the process of configuring the servers, and then…