### Start Cluster Supervisor in Application

Source: https://github.com/bitwalker/libcluster/blob/main/README.md

This Elixir code demonstrates how to start the `Cluster.Supervisor` within an Elixir application's supervision tree. It defines a topology using the `Cluster.Strategy.Epmd` strategy with static host configuration and includes the supervisor as a child process.

```Elixir
defmodule MyApp.App do
  use Application

  def start(_type, _args) do
    topologies = [
      example: [
        strategy: Cluster.Strategy.Epmd,
        config: [hosts: [:"a@127.0.0.1", :"b@127.0.0.1"]],
      ]
    ]
    children = [
      {Cluster.Supervisor, [topologies, [name: MyApp.ClusterSupervisor]]},
      # ..other children..
    ]
    Supervisor.start_link(children, strategy: :one_for_one, name: MyApp.Supervisor)
  end
end
```

--------------------------------

### Install libcluster Dependency

Source: https://github.com/bitwalker/libcluster/blob/main/README.md

This snippet shows how to add the libcluster library as a dependency in an Elixir project's `deps.ex` file. It specifies the package name and a version range.

```Elixir
defp deps do
  [{:libcluster, "~> MAJ.MIN"}]
end
```

--------------------------------

### Configure libcluster Topologies in Mix Config

Source: https://github.com/bitwalker/libcluster/blob/main/README.md

This Elixir code snippet shows how to configure `libcluster` topologies using a Mix configuration file (`config.exs`). It defines an `epmd_example` topology with the `Cluster.Strategy.Epmd` strategy, including static host configuration and optional `connect`, `disconnect`, and `list_nodes` functions.

```Elixir
config :libcluster,
  topologies:
    epmd_example: [
      # The selected clustering strategy. Required.
      strategy: Cluster.Strategy.Epmd,
      # Configuration for the provided strategy. Optional.
      config: [hosts: [:"a@127.0.0.1", :"b@127.0.0.1"]],
      # The function to use for connecting nodes. The node
      # name will be appended to the argument list. Optional
      connect: {:net_kernel, :connect_node, []},
      # The function to use for disconnecting nodes. The node
      # name will be appended to the argument list. Optional
      disconnect: {:erlang, :disconnect_node, []},
      # The function to use for listing nodes.
      # This function must return a list of node names. Optional
      list_nodes: {:erlang, :nodes, [:connected]},
    ],
    # more topologies can be added ...
    gossip_example: [
      # ...
    ]
  ]
```

--------------------------------

### Implement Custom Cluster Strategy

Source: https://github.com/bitwalker/libcluster/blob/main/README.md

To create a custom clustering strategy, implement the `Cluster.Strategy` behavior. This requires implementing the `start_link/1` callback and optionally overriding `child_spec/1`. Designing the strategy as an OTP process, like a GenServer, is recommended for state management.

```Elixir
defmodule MyClusterStrategy do
  @behaviour Cluster.Strategy

  def start_link(opts) do
    # Implementation for starting the strategy process
    # e.g., GenServer.start_link(MyStrategyProcess, opts, [])
  end

  # Optional: override child_spec/1 if needed
  # def child_spec(opts) do
  #   # Implementation for child specification
  # end
end
```

--------------------------------

### Configure Custom Connection Functions

Source: https://github.com/bitwalker/libcluster/blob/main/README.md

Libcluster allows overriding the default Erlang distribution protocol by providing custom `connect` and `disconnect` functions. If not using Erlang distribution, a `list_nodes` implementation is also mandatory. These functions should be provided as `{module, fun, args}` tuples.

```Elixir
config :libcluster,
  strategy: Cluster.Strategy.MyCustomStrategy,
  connect: {MyConnectionModule, :connect, []},
  disconnect: {MyConnectionModule, :disconnect, []},
  list_nodes: {MyConnectionModule, :list_nodes, []}
```

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