diff --git a/terraform/multi-part cloud-init/data.tf b/terraform/multi-part cloud-init/data.tf
new file mode 100644
index 0000000..478de89
--- /dev/null
+++ b/terraform/multi-part cloud-init/data.tf	
@@ -0,0 +1,45 @@
+# https://registry.terraform.io/providers/hashicorp/cloudinit/latest/docs
+# https://github.com/chrusty/terraform-multipart-userdata/blob/master/example/cloudinit.tf
+
+data "cloudinit_config" "azurerm_linux_virtual_machine" {
+  # Disabled only to make the rendered config readable in the outputs.
+  gzip          = false
+  base64_encode = false
+
+  part {
+    content      = file("${path.module}/files/base.yaml")
+    content_type = "text/cloud-config"
+    filename     = "base"
+  }
+
+  # part {
+  #   content      = file("${path.module}/templates/n-th.yaml")
+  #   content_type = "text/cloud-config"
+  #   merge_type   = "dict(recurse_array,no_replace)+list(append)"
+  #   filename     = "n-th.yaml"
+  # }
+}
+
+data "cloudinit_config" "oci_core_instance" {
+  # Disabled only to make the rendered config readable in the outputs.
+  gzip          = false
+  base64_encode = false
+
+  part {
+    content      = file("${path.module}/files/base.yaml")
+    content_type = "text/cloud-config"
+    filename     = "base"
+  }
+
+  part {
+    content = templatefile(
+      "${path.module}/templates/boinc-client.oci-core-instance.yaml.tftpl",
+      {
+        user = "opc"
+      }
+    )
+    content_type = "text/cloud-config"
+    merge_type   = "dict(recurse_array,no_replace)+list(append)"
+    filename     = "n-th.yaml"
+  }
+}
diff --git a/terraform/multi-part cloud-init/files/base.yaml b/terraform/multi-part cloud-init/files/base.yaml
new file mode 100644
index 0000000..9d37cc1
--- /dev/null
+++ b/terraform/multi-part cloud-init/files/base.yaml	
@@ -0,0 +1,4 @@
+#cloud-config
+
+package_reboot_if_required: false
+package_upgrade: false
diff --git a/terraform/multi-part cloud-init/main.tf b/terraform/multi-part cloud-init/main.tf
new file mode 100644
index 0000000..2e5d001
--- /dev/null
+++ b/terraform/multi-part cloud-init/main.tf	
@@ -0,0 +1,12 @@
+# resource "azurerm_linux_virtual_machine" "vm" {
+#   user_data = data.cloudinit_config.azurerm_linux_virtual_machine.rendered
+#   …
+# }
+
+# resource "oci_core_instance" "instance" {
+#   …
+#   metadata = {
+#     …
+#     user_data = data.cloudinit_config.oci_core_instance.rendered
+#   }
+# }
diff --git a/terraform/multi-part cloud-init/outputs.tf b/terraform/multi-part cloud-init/outputs.tf
new file mode 100644
index 0000000..300cf27
--- /dev/null
+++ b/terraform/multi-part cloud-init/outputs.tf	
@@ -0,0 +1,7 @@
+output "cloudinit_config_azurerm_linux_virtual_machine" {
+  value = data.cloudinit_config.azurerm_linux_virtual_machine.rendered
+}
+
+output "cloudinit_config_oci_core_instance" {
+  value = data.cloudinit_config.oci_core_instance.rendered
+}
diff --git a/terraform/multi-part cloud-init/templates/boinc-client.oci-core-instance.yaml.tftpl b/terraform/multi-part cloud-init/templates/boinc-client.oci-core-instance.yaml.tftpl
new file mode 100644
index 0000000..917d708
--- /dev/null
+++ b/terraform/multi-part cloud-init/templates/boinc-client.oci-core-instance.yaml.tftpl	
@@ -0,0 +1,6 @@
+#cloud-config
+
+packages:
+  - boinc-client
+
+# Something about user ${user}