hostname and puppet script as template

cloudinit-updates-jenkins-io.tftpl

@@ -0,0 +1,19 @@
+#cloud-config
+write_files:
+  - path: /run/puppetinstall/puppet.conf
+    owner: root:root
+    permissions: '0755'
+    content: |
+      [main]
+      server = puppet.jenkins.io
+      [agent]
+      certname = ${hostname}
+runcmd:
+  - [ mkdir, -p, /run/puppetinstall ]
+  - [ wget, "https://apt.puppetlabs.com/puppet6-release-focal.deb", -O, /run/puppetinstall/puppet6-release-focal.deb ]
+  - [ dpkg, -i, /run/puppetinstall/puppet6-release-focal.deb ]
+  - [ apt-get, update, -y ]
+  - [ apt-get, install, "puppet-agent=6.23.0*", --yes, --quiet, --no-install-recommends ]
+  - [ mv, /run/puppetinstall/puppet.conf, /etc/puppetlabs/puppet/puppet.conf]
+  - [ systemctl, start, puppet ]
+  - [ systemctl, enable, puppet ]

updates.jenkins.io.tf

@@ -1,15 +1,16 @@
 data "oci_core_images" "updates_jenkins_io" {
   compartment_id           = var.compartment_ocid
   operating_system         = "Canonical Ubuntu"
-  operating_system_version = "22.04"
+  operating_system_version = "20.04"
   state                    = "AVAILABLE"
   shape                    = local.updates_jenkins_io_shape
   sort_by                  = "TIMECREATED"
   sort_order               = "DESC"
 }
 
 locals {
-  updates_jenkins_io_shape = "VM.Standard.A1.Flex" #imply ARM
+  updates_jenkins_io_shape    = "VM.Standard.A1.Flex" #imply ARM
+  updates_jenkins_io_hostname = "oracle.updates.jenkins.io"
 }
 
 resource "oci_core_volume_backup_policy" "updates_jenkins_io" {
@@ -57,9 +58,11 @@ resource "oci_core_instance" "updates_jenkins_io" {
     subnet_id        = oci_core_subnet.public_subnet.id
     assign_public_ip = false #will assign a non ephemeral one (RESERVED ip)
     nsg_ids          = [oci_core_network_security_group.updates_jenkins_io.id]
+    hostname_label   = local.updates_jenkins_io_hostname
   }
   metadata = {
     ssh_authorized_keys = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGFrPRIlP8qplANgNa3IO5c1gh0ZqNNj17RZeYcm+Jcb jenkins-infra-team@googlegroups.com"
+    user_data           = base64encode(templatefile("./cloudinit-updates-jenkins-io.tftpl", { hostname = "${local.updates_jenkins_io_hostname}" }))
   }
   display_name  = "Virtual Machine for updates.jenkins.io service"
   freeform_tags = local.all_tags