on page 23 of the book

Vagrantfile

@@ -0,0 +1,25 @@
+Vagrant.configure("2") do |config|
+  config.vm.box = "generic/rocky9"
+  config.ssh.insert_key = false
+  config.vm.synced_folder "." "/vagrant", disabled: true
+  
+  config.vm.provider :virtualbox do |v|
+    v.memory = 512
+    v.linked_clone = true
+  end
+
+  config.vm.define "app1" do |app|
+    app.vm.hostname = "orc-app1.test"
+    app.vm.network :private_network, ip: "192.168.60.4"
+  end
+
+  config.vm.define "app2" do |app|
+    app.vm.hostname = "orc-app2.test"
+    app.vm.network :private_network, ip: "192.168.60.5"
+  end
+
+  config.vm.define "db" do |db|
+    db.vm.hostname = "orc-db.test"
+    db.vm.network :private_network, ip: "192.168.60.6"
+  end
+end