renv

renv

A dead simple command line interface for managing remote configuration. Powered by etcd, inspired by heroku.

renv gives you:

• a heroku-inspired interface (set, unset).
• tools for managing your environment using JSON configuration files (import).

Installation

npm install renv -g

Core Concepts

config paths

renv prefixes the configuration it stores with /:application/:environment, where:

• application: is the application that you wish to store configuration for. (it tries to grab this out of a package.json).
• environment: is the environment to store the configuration for, e.g., development, production, test.

this is opinionated, but it works dang it!

how JSON is represented

rather than serializing JSON to a single key, renv uses directories in etcd to store a representation of the imported JSON file.

This is cool because:

• you can listen for changes on individual keys.
• you can modify keys atomically.

.renvrc

Use a .renvrc to store information about your production etcd host:

hosts=etcd.example.com:443
ssl=true

The Interface

config

List all configuration for a given application, and environment.

Use --output json, to dump the configuration to disk:

renv config --environment production --output json > service.json.

set

Set a single configuration variable:

renv set URL=http://www.example.com

Set multiple configuration variables:

renv set URL=http://www.example.com TIMEOUT=5000

Creating or updating an object:

renv set OBJ.x 33 OBJ.y 99

Creating or updating an array:

renv set ARR.0 33 ARR.1 99

unset

Delete a single configuration variable:

renv unset OBJ

Delete multiple configuration variables:

renv unset OBJ ARR

import

Import a JSON file and create keys and directories recursively.

renv import ./test/fixtures/service.json

nuke

nuke all configuration for the current application and environment

Danger, Will Robinson.

renv nuke

dump

Dump configuration for all applications and environments:

renv dump

merge

Merge two configuration environments, useful if production servers only vary slightly.

renv merge --application2 production-server-east