Libcluster with two or more topologies and strategies?

niccolox · June 24, 2019, 1:30am

I want to run a single Phoenix Elixir Erlang cluster with Libcluster and use two or more topologies (and strategies) in Production.

i.e. Cluster.Strategy.Epmd for a pets_topology and a cattle_topology with Cluster.Strategy.Kubernetes.DNS

the idea to have a core topology of “pets” and a “cattle” topology for expendable nodes.

I found a comment in the libcluster source but haven’t found anything more

examples or pointers welcome

You can start clustering for one or more topologies.

github.com

bitwalker/libcluster/blob/5b12620f53d2f4fb3ea893bef6e51ee3efad129d/config/config.exs#L5


# This file is provided as an example of how to configure libcluster in your own apps
use Mix.Config


config :libcluster,
  # You can start clustering for one or more topologies.
  topologies: [
    example: [
      # The selected clustering strategy. Required.
      strategy: Cluster.Strategy.Epmd,
      # Options for the provided strategy. Optional.
      config: [],
      # The function to use for connecting nodes. The node
      # name will be appended to the argument list. Optional
      connect: {:net_kernel, :connect, []},
      # The function to use for disconnecting nodes. The node

niccolox · June 24, 2019, 1:39am

since version 2.0.0

“The ability to start libcluster for more than a single topology”

github.com

bitwalker/libcluster/blob/master/CHANGELOG.md

# Changelog

## Unreleased

- Use new cypher names

### 3.3.0

### Changed

- Default multicast address is now 233.252.1.32, was 230.1.1.251, [commit](https://github.com/bitwalker/libcluster/commit/449a65e14f152a83a0f8ee371f05743610cd292f)


### 2.3.0

### Added

- Clustering strategy for the Rancher container platform (see: https://github.com/rancher/rancher)
- LocalEpmd strategy that uses epmd to discover nodes on the local host
- Gossip strategy multicast interface is used for adding multicast membership

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I guess I will just have to test it