diff --git a/build.sh b/build.sh
index ce5db7e..2fb721c 100755
--- a/build.sh
+++ b/build.sh
@@ -46,8 +46,12 @@ function die_var_unset {
 [[ -f $build_conf ]] || { echo "User variables file '$build_conf' not found."; exit 1; }
 source $build_conf
 
+[[ -z "$vm_name" ]] && die_var_unset "vm_name"
 [[ -z "$vm_default_user" ]] && die_var_unset "vm_default_user"
 [[ -z "$vm_memory" ]] && die_var_unset "vm_memory"
+[[ -z "$vm_cores" ]] && die_var_unset "vm_cores"
+[[ -z "$vm_sockets" ]] && die_var_unset "vm_sockets"
+[[ -z "$ssh_username" ]] && die_var_unset "ssh_username"
 [[ -z "$proxmox_host" ]] && die_var_unset "proxmox_host"
 [[ -z "$proxmox_user" ]] && die_var_unset "proxmox_user"
 [[ -z "$proxmox_storage_vm" ]] && die_var_unset "proxmox_storage_vm"
diff --git a/ubuntu-20.04-amd64-proxmox/build.conf b/ubuntu-20.04-amd64-proxmox/build.conf
index 8eea994..94ff6a5 100644
--- a/ubuntu-20.04-amd64-proxmox/build.conf
+++ b/ubuntu-20.04-amd64-proxmox/build.conf
@@ -1,5 +1,9 @@
+vm_name=tmpl-ubuntu-20.04
 vm_default_user=lunarops-user
 vm_memory=1024
+vm_cores=1
+vm_sockets=0
+ssh_username=root
 default_vm_id=100 # default VM ID for Ubuntu
 proxmox_url=https://pve0.internal.lunarops.net:8006/api2/json
 proxmox_host=pve0
diff --git a/ubuntu-20.04-amd64-proxmox/playbook/server-template-vars.yml b/ubuntu-20.04-amd64-proxmox/playbook/server-template-vars.yml
index eb815a0..e0ca84e 100644
--- a/ubuntu-20.04-amd64-proxmox/playbook/server-template-vars.yml
+++ b/ubuntu-20.04-amd64-proxmox/playbook/server-template-vars.yml
@@ -1,7 +1,7 @@
 ---
 
-iserver_hostname: ubuntu2004-kvm
-iserver_sshkey: "ssh-rsa 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 lunarops_user@lunarops.io
+iserver_hostname: ubuntu
+iserver_sshkey: "ssh-rsa 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 lunarops-user@lunarops.io
 "
 
 iserver_ubuntu_repos:
diff --git a/ubuntu-20.04-amd64-proxmox/ubuntu-20.04-amd64-proxmox.json b/ubuntu-20.04-amd64-proxmox/ubuntu-20.04-amd64-proxmox.json
index 30ae201..2dc86e3 100644
--- a/ubuntu-20.04-amd64-proxmox/ubuntu-20.04-amd64-proxmox.json
+++ b/ubuntu-20.04-amd64-proxmox/ubuntu-20.04-amd64-proxmox.json
@@ -11,11 +11,13 @@
         "proxmox_storage_iso": "{{env `proxmox_storage_iso`}}",
         "iso_filename": "{{env `iso_filename`}}",
         "vm_id": "{{env `vm_id`}}",
-        "vm_name": "ubuntu2004-tmpl",
+        "vm_name": "{{env `vm_name`}}",
         "template_description": "Ubuntu 20.04 x86_64 template built with packer ({{env `vm_ver`}}). Username: {{env `vm_default_user`}}",
         "vm_default_user": "{{env `vm_default_user`}}",
         "vm_memory": "{{env `vm_memory`}}",
-        "ssh_username": "root",
+        "vm_cores": "{{env `vm_cores`}}",
+        "vm_sockets": "{{env `vm_sockets`}}",
+        "ssh_username": "{{env `ssh_username`}}",
         "ssh_password": "{{env `ssh_password`}}"
     },
     "sensitive-variables": ["proxmox_password", "ssh_password" ],
@@ -43,7 +45,8 @@
             "vm_name": "{{user `vm_name`}}",
             "template_description":"{{user `template_description`}}",
             "memory": "{{user `vm_memory`}}",
-            "cores": "2",
+            "cores": "{{user `vm_cores`}}",
+            "sockets": "{{user `vm_sockets`}}",
             "os": "l26",
             "http_directory": "http",