Mark Ekisa ivermac

Clojure Destructuring Tutorial and Cheat Sheet

Simply put, destructuring in Clojure is a way extract values from a datastructure and bind them to symbols, without having to explicitly traverse the datstructure. It allows for elegant and concise Clojure code.

Vectors and Sequences

Eric Elliott's "Composing Software" Series

A collection of links to the excellent "Composing Software" series of medium stories by Eric Elliott.

Edit: I see that each post in the series now has index, previous and next links. However, they don't follow a linear flow through all the articles with some pointing back to previous posts effectively locking you in a loop.

We keep all our Terraform files under the terraform directory.

Terraform allows to reuse definitions across environments. We thus don't have to have a set of definitions for provisioning Onadata resources in the production environment and a different set of definitions for provisioning Onadata resources in the staging environment. How we go about this is by creating a shared Terraform module for our setup, then including this module in Terraform files corresponding to each of the environments we plan to deploy the setup.

The following subsections will take you through how to codify your setup using Terraform, the Ona way. As a reference, we will use Onadata's Terraform files:

1. Create a Reusable Module

Keep the Terraform resource blocks for your setup in ../terraform/modules/. For instance, the Onadata setup's resource blocks are kept in terraform/modules/onadata. Then isolate the Ter

	# Check existing
	- name: Ansible check file exists.
	stat:
	path: /etc/filename
	register: file_status
	- debug:
	msg: "File exists..."
	when: file_status.stat.exists
	- debug:
	msg: "File not found"