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Monthly Downloads: 8
Programming language: Haskell
License: Apache License 2.0
Tags: DevOps    

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README

DepTrack project

Umbrella repository for the various DepTrack projects.

Goal of DepTrack.

DepTrack is an approach more than a tool. The key finding of the DepTrack approach is that programs logs are more useful when shaped like a tree than when shaped like a sequence. Using such an approach, rather than manually connecting nodes in a graph, one can focus on computing a value which describes a high-level goal and records a tree of dependencies used during the computation.

Sub-projects

deptrack-core

The lowest-level brick, a monad transformer to describe trees and directed-acyclic graphs. This brick allows you to write DSL-like libraries that record directed-acyclic graphs with a node type that best describe your problem. This approach let you decouple how you operate on (i.e., what you do with) the graph from express (i.e., which library builds) the graph. This way, the day you feel like DepTrack is no longer suitable to express your dependency graph you can still keep your functions to operate on the graph.

deptrack-devops

This library uses deptrack-core to perform Devops tasks. Devops is a job title, and Devops engineers need to do two main things: (a) describe an infrastructure and, (b) evaluate the description (e.g., to make the world converge towards their intention, or to diagnose which bits of the system diverged too much). In particular, (a) encodes a dependency graph between various subsystems of the infrastructure: faults and outages follow dependencies. Hence, the Devops space is a good playground for the DepTrack approach of building dependency graphs.

The author was dissatisfied with existing Devops tools: some existing tools claim to use a declarative syntax (generally YAML) but actually use templated-YAML. As a result, the actual description of an infrastructure (a) is a mix of a template language and a description language. The language used in the evaluator (b) often is the same scripting language as the one used in the description, however they do not interact well: a main program provided by the solution is in charge of generating the description and evaluating it. Such main programs impose structure (which can be useful at times) but leave little room for creativity. Last, the fact that scripting languages dominate the Devops tools space is annoying because applications written with scripting languages are ironically hard to deploy and have poor performance (and abismal multicore scalability).

Existing tools have a number of drawbacks:

  • using YAML as a description language prevents taking advantage of libraries (e.g., running a database query when generating the description, or verifying some configs with a testing framework)
  • it's hard to manipulate the resulting graph by hand if the evaluation language varies from the infrastructure description language or if the evaluator is a monolithic program
  • the devop configuring description does not build an understanding of the internals of the interpreter (I believe such opacity encourages copy/pasting to work around problems)
  • the split between computation/declaration forces a code/configuration split as well. Such split can become un-natural and imposes extra jargon because the actual infrastructure description is the encouter of the computations with the static/declarative parts.

Our industry needs to empower Devops to describe infrastructure and operate on the description creatively (e.g., generating statistics/simulations from such descriptions). DepTrack is an attempt to move the state of the art forward. Once you have a graph and manipulate it, you can estimate resource needs, you can budget your monitoring on the most critical bits etc.

This library is written in Haskell and requires Devops to also describe infrastructure in Haskell. Using Haskell for DepTrack has the following advantages:

  • Devops are in charge of the dependency graph evaluation. This repository provides the basics way of building dependency graphs and let you write your main program as you wish. This approach let you read, expose, and manipulate configurations as your organization needs it rather than trying to retrofit a Devops tool on your organization. It's not more work because it needs fewer "ugly hacks".
  • One can modify the dependency graph before evaluating it (e.g., to batch actions that can be done together)
  • The type system ensures that the graph generation is deterministic (i.e., a same input gives the same dependency graph)
  • The type system allows you to speak about high level concepts such as "remote services providing Foo", "local service consuming Foo", and making sure you bind these two things correctly together
  • Haskell usually compiles to an easy-to deploy binary.
  • Haskell comes with mature libraries, best-in-class testing frameworks, and profiling tools. You can leverage all of this using DepTrack for DevOps.

One drawback of using Haskell is that there's more upfront learning than learning YAML+scripting languages. However, longer term, the author believes you can reach further with DepTrack than existing Devops tools.

deptrack-devops-recipes

This module provides some recipes to configure machines. It contains things I found useful to configure my personal servers; mostly Debian-like. Organization of this module is likely to change. See the README in this directory to have an up-to date description.

Using DepTrack Devops

We provide a Mustache template to start new DepTrack for Devops projects. After installing the Haskell Stack tool, you can do as follows:

stack new my-project https://raw.githubusercontent.com/lucasdicioccio/deptrack-project/master/deptrack-devops.hsfiles

cd my-project

stack build

You can also study and modify the examples from deptrack-devops-examples.

  • clone the repo
  • stack install the repo
  • take example on deptrack-devops-examples/ to build your binaries

This can be done as follows

git clone https://github.com/lucasdicioccio/deptrack-project.git
cd deptrack-project
stack setup
cd deptrack-devops-examples
stack install

Contributing to DepTrack

Contributions to DepTrack projects are welcome. Please use GitHub issues for discussions. Please add yourself to the Contributors list in your pull requests.

The bulleted-list of the DepTrack contributor is as follows:

  • be humble
  • be fair
  • be kind
  • be patient
  • all contributions matter (even one-char typos fixes in documentation)

Contributors & Thanks

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