improvement: direct use dns_cluster

Taskfile-fly-io.yml

@@ -37,6 +37,7 @@ tasks:
   # Opening https://fly.io/apps/hello-phx-up
   board: fly dashboard
   # Add a dedicated ipv4 with: fly ips allocate-v4
+  ips: fly ip private
 
   ## DB
   # fly checks list -a hello-phx-up-db

Taskfile.yml

@@ -145,7 +145,8 @@ tasks:
   lv-help: task lv-start -- --help
   lv-install: mix archive.install hex livebook
   # https://fly.io/docs/elixir/advanced-guides/clustering-from-home-to-your-app-in-fly/
-  lv-fly-remote: ./cluster-with-remote.sh
+  lv-fly-remote: run/cluster-with-remote.sh
+  dns-query: dig hello-phx-up.internal aaaa
 
   ## DB Setup
   pgcli: pgcli postgresql://postgres:postgres@localhost:5433

config/runtime.exs

@@ -69,20 +69,20 @@ if config_env() == :prod do
   # app_name =
   #   System.get_env("FLY_APP_NAME") ||
   #     raise "FLY_APP_NAME not available"
-  if app_name =
-       System.get_env("FLY_APP_NAME") do
-    config :libcluster,
-      topologies: [
-        fly6pn: [
-          strategy: Cluster.Strategy.DNSPoll,
-          config: [
-            polling_interval: 5_000,
-            query: "#{app_name}.internal",
-            node_basename: app_name
-          ]
-        ]
-      ]
-  end
+  # if app_name =
+  #      System.get_env("FLY_APP_NAME") do
+  #   config :libcluster,
+  #     topologies: [
+  #       fly6pn: [
+  #         strategy: Cluster.Strategy.DNSPoll,
+  #         config: [
+  #           polling_interval: 5_000,
+  #           query: "#{app_name}.internal",
+  #           node_basename: app_name
+  #         ]
+  #       ]
+  #     ]
+  # end
 
   # ## SSL Support
   #

fly.toml

@@ -10,29 +10,30 @@ kill_signal = 'SIGTERM'
 [build]
 
 [deploy]
-  release_command = '/app/bin/migrate'
+release_command = '/app/bin/migrate'
 
 [env]
-  PHX_HOST = 'hello-phx-up.fly.dev'
-  PORT = '8080'
-  # https://fly.io/docs/elixir/getting-started/#important-ipv6-settings
-  ERL_AFLAGS = "-proto_dist inet6_tcp"
-  ECTO_IPV6 = "true"
-  RELEASE_COOKIE = "73TPJVMoeacSQ0uK-vyJOp4tL9dRYk2wmwq7tmHtaX0HWfl-59NWLw=="
+PHX_HOST = 'hello-phx-up.fly.dev'
+PORT = '8080'
+# https://fly.io/docs/elixir/getting-started/#important-ipv6-settings
+DNS_CLUSTER_QUERY=
+ERL_AFLAGS = "-proto_dist inet6_tcp"
+ECTO_IPV6 = "true"
+RELEASE_COOKIE = "73TPJVMoeacSQ0uK-vyJOp4tL9dRYk2wmwq7tmHtaX0HWfl-59NWLw=="
 
 [http_service]
-  internal_port = 8080
-  force_https = true
-  auto_stop_machines = true
-  auto_start_machines = true
-  min_machines_running = 1
-  processes = ['app']
+internal_port = 8080
+force_https = true
+auto_stop_machines = true
+auto_start_machines = true
+min_machines_running = 0
+processes = ['app']
 
-  [http_service.concurrency]
-    type = 'connections'
-    hard_limit = 1000
-    soft_limit = 1000
+[http_service.concurrency]
+type = 'connections'
+hard_limit = 1000
+soft_limit = 1000
 
 [[vm]]
-  size = 'shared-cpu-1x'
-  memory = "512mb"
+size = 'shared-cpu-1x'
+memory = "512mb"

lib/hello_phx/application.ex

@@ -7,7 +7,7 @@ defmodule HelloPhx.Application do
 
   @impl true
   def start(_type, _args) do
-    topologies = Application.get_env(:libcluster, :topologies) || []
+    # topologies = Application.get_env(:libcluster, :topologies) || []
 
     children = [
       HelloPhxWeb.Telemetry,
@@ -17,7 +17,7 @@ defmodule HelloPhx.Application do
       # Start the Finch HTTP client for sending emails
       {Finch, name: HelloPhx.Finch},
       # setup for clustering
-      {Cluster.Supervisor, [topologies, [name: HelloPhx.ClusterSupervisor]]},
+      # {Cluster.Supervisor, [topologies, name: HelloPhx.ClusterSupervisor]},
       # Start a worker by calling: HelloPhx.Worker.start_link(arg)
       # {HelloPhx.Worker, arg},
       # Start to serve requests, typically the last entry

lib/hello_phx_web/controllers/page_html/home.html.heex

@@ -60,7 +60,7 @@
       <% end %>
     </p>
     <p>
-      Mode: <%= HelloPhx.build_mode() %> || <%= HelloPhx.commit() |> inspect %> on v<%= HelloPhx.vsn() %> || Locale: <%= @locale %>
+      Mode: <%= HelloPhx.build_mode() %> || v<%= HelloPhx.vsn() %> commit at: <%= HelloPhx.commit().commit_time %> head: <%= HelloPhx.commit().commit_id |> String.slice(0, 6) %>  || Locale: <%= @locale %>
     </p>
 
     <p class="text-[2rem] mt-4 font-semibold leading-10 tracking-tighter text-zinc-900 text-balance">

mix.exs

@@ -84,8 +84,8 @@ defmodule HelloPhx.MixProject do
       # {:timex, "~> 3.7"},
       {:git_ops, "~> 2.6", only: [:dev], runtime: false},
 
-      ## cluster
-      {:libcluster, "~> 3.3"},
+      # ## cluster
+      # {:libcluster, "~> 3.3"},
 
       # Graphing/charting - for Livebook or analysis
       {:vega_lite, "~> 0.1.9"},

rel/env.sh.eex

@@ -19,13 +19,13 @@
 # export RELEASE_DISTRIBUTION=name
 # export RELEASE_NODE=<%= @release.name %>
 
-## support libcluster on fly.io
+## support cluster on fly.io
 if [ -n "$FLY_APP_NAME" ]; then
   echo "==>running app: ${FLY_APP_NAME} cluster on fly.io"
   export RELEASE_DISTRIBUTION="name"
   # ip=$(grep fly-local-6pn /etc/hosts | cut -f 1)
   ip=$FLY_PRIVATE_IP
   export RELEASE_NODE=$FLY_APP_NAME@$ip
   # export RELEASE_NODE="${FLY_APP_NAME}-${FLY_IMAGE_REF##*-}@${FLY_PRIVATE_IP}"
-  # export DNS_CLUSTER_QUERY="${FLY_APP_NAME}.internal"
+  export DNS_CLUSTER_QUERY="${FLY_APP_NAME}.internal"
 fi