fix memcached on ruby 3

config/application.rb

@@ -66,6 +66,7 @@ def self.deprecated_url(var)
     when "memory"
       config.cache_store = :memory_store # to debug cache keys, bundle open activesupport -> active_support/cache.rb#log
     when "memcached"
+      require_relative "initializers/sockify"
       options = {
         value_max_bytes: 3000000,
         compress: true,

config/initializers/sockify.rb

@@ -0,0 +1,15 @@
+# TODO: remove one `rails runner 'Rails.cache.fetch 1'` works with memcached
+# dalli has this code inside an `if RUBY_VERSION >= '3.0'` but only old version works
+require 'dalli'
+
+class Dalli::Socket::TCP
+  def self.open(host, port, options = {})
+    Timeout.timeout(options[:socket_timeout]) do
+      sock = new(host, port)
+      sock.options = { host: host, port: port }.merge(options)
+      init_socket_options(sock, options)
+
+      options[:ssl_context] ? wrapping_ssl_socket(sock, host, options[:ssl_context]) : sock
+    end
+  end
+end