Peerage EC2 Provider

helps your nodes find each other.

It supports DNS-based discovery, which means you can use it out of the box with Kubernetes (and probably also Weave, discoverd, Swarm, or other anything else with dns-based service discovery).

It also supports UDP-based discovery, so that nodes on the same network (like docker containers on the same host) can find each other.

This library adds support for API-based discovery of nodes running in an AWS VPC on EC2 or Elastic Beanstalk.

Installation

Add peerage_ec2 to your list of dependencies in mix.exs:

    def deps do
      [
        {:peerage_ec2, "~> 1.2.0"},
      ]
    end

Note that the latest release may be a different version number than the version number noted in this document. You can find the latest release on Hex for peerage_ec2. You should match the version or alternatively you can use a looser version constraint like "~> 1.1".

Usage

See for setup instructions specific to that library. To configure the Peerage.Via.Ec2 provider:

  config :peerage, via: Peerage.Via.Ec2
  config :peerage_ec2, aws_access_key_id: "...",
                       aws_secret_access_key: "...",
                       tags: [{:cluster, "..."}, {:service, "..."}]

tags are mappings to tags set on your EC2 instances. If using Elastic Beanstalk, these tags are set within the EB environment configuration. The cluster tag is used to discover all nodes in your cluster (“production”, “staging”, etc). The service tag is used to name each node/service that is found (“accounts”, “payments”, etc).

Peerage.Via.Ec2 uses a polling mechanism, so a GenServer is not necessary.