metaconfig

Get configurations from a metadata service with fallbacks

npm install metaconfig
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metaconfig

Gets configurations from metadata services running on ec2 or openstack, and has a fallback for when those services aren't available (Like on your dev system)

Console logs when it uses backup, and lets you know why its using backup

Build
Status

Example


var config = require('metaconfig');

var opts =  { backup: { db : 'test'}};
config.readConfig(opts, function(conf){
  console.log(conf);
  startApp();
});

function startApp(){
  var c = config.getConfig();
  console.log(c);
  // Config is cached after readConfig!
});

methods

metaconfig is very small, one async function for reading from metadata service and one for getting a cached version

readConfig(opts, cb)

Reads in the configuration from the meta data service, by default it uses http://169.254.169.254/1.0/user-data , but you can use a different url by passing it the option userdata_url.

ReadConfig expects a json string from the metadata service with the config stored at key "app_config"; This can be changed by passing the key option.

ReadConfig will cache the configuration until readConfig is called again.

getConfig()

Sync function returns the cached configuration

userdata example

{
  "app_name" : "nova-metadata-test",
  "version" : "0.0.1",
  "app_config": {
      "memory" :  "10.255.132.191",
        "db" : "cloud"
  }
}
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