net-lab: add hosts and category iteration logic

* add a category variable
* add multiple different hosts and enable specifying base image per vm or
per category
* add comments to explain the code
* rename the project
* rename the base domain

vms/main.tf

@@ -48,23 +48,32 @@ variable "sourceimage" {
   type    = string
   default = "https://download.fedoraproject.org/pub/fedora/linux/releases/33/Cloud/x86_64/images/Fedora-Cloud-Base-33-1.2.x86_64.qcow2"
 }
+variable "category" {
+  type    = string
+  default = "host"
+}
 
 # base OS image
 resource "libvirt_volume" "baseosimage" {
-  name   = "baseosimage_${var.projectname}"
+  for_each = var.hosts
-  source = var.sourceimage
+  # if desired, base image could be specified for a category of devices sharing
+  # the base image using name = "baseosimage_${var.projectname}.${each.value.category}"
+  name   = "baseosimage_${var.projectname}.${each.value.name}"
+  source = each.value.sourceimage
   pool   = var.baseimagediskpool
 }
 
 # vdisk creation
 # vdisks are cloned from the base image for each of the "hosts"
 resource "libvirt_volume" "qcow2_volume" {
-  for_each       = var.hosts
+  for_each = var.hosts
-  name           = "${each.value.name}.qcow2"
+  name     = "${each.value.name}.qcow2"
-  base_volume_id = libvirt_volume.baseosimage.id
+  # let each baseos image have a name after the vm using it
+  base_volume_id = libvirt_volume.baseosimage[each.value.name].id
   pool           = each.value.diskpool
-  format         = "qcow2"
+  # currently a hard constraint to only use qcow2, could become settable
-  size           = each.value.disksize
+  format = "qcow2"
+  size   = each.value.disksize
 }
 
 # Use cloudinit config file
@@ -85,8 +94,8 @@ resource "libvirt_cloudinit_disk" "commoninit" {
   user_data = data.template_file.user_data[each.key].rendered
 }
 
-# default guest
+# net-lab domains loop
-resource "libvirt_domain" "default_guest" {
+resource "libvirt_domain" "net-lab" {
   for_each = var.hosts
   name     = each.value.name
   vcpu     = each.value.vcpu
@@ -103,12 +112,12 @@ resource "libvirt_domain" "default_guest" {
     volume_id = element(libvirt_volume.qcow2_volume[each.key].*.id, 1)
   }
 
-  cloudinit = libvirt_cloudinit_disk.commoninit[each.key].id
+  cloudinit = libvirt_cloudinit_disk.commoninit[each.value.name].id
 
 }
 
 
 output "hostnames" {
-  value = [libvirt_domain.default_guest.*]
+  value = [libvirt_domain.net-lab.*]
 }
 

vms/terraform.tfvars

@@ -1,8 +1,9 @@
 # project name
-projectname = "vms"
+projectname = "net-lab-infra"
 
 # OS image
-#sourceimage = "https://cloud.centos.org/centos/8/x86_64/images/CentOS-8-GenericCloud-8.3.2011-20201204.2.x86_64.qcow2"
+# sourceimage = "$HOME/.images/CentOS-8-GenericCloud-8.3.2011-20201204.2.x86_64.qcow2"
+# sourceimage = "$HOME/.images/Fedora-Cloud-Base-33-1.2.x86_64.qcow2"
 sourceimage = "https://download.fedoraproject.org/pub/fedora/linux/releases/33/Cloud/x86_64/images/Fedora-Cloud-Base-33-1.2.x86_64.qcow2"
 
 # the base image is the source image for all VMs created from it
@@ -18,21 +19,55 @@ networkname = "default" # default==NAT
 # RAM in bytes
 # disk size in bytes (disk size must be greater than source image virtual size)
 hosts = {
-  "victim" = {
+  "h_victim" = {
-    name     = "victim",
+    name        = "h_victim",
-    vcpu     = 1,
+    vcpu        = 1,
-    memory   = "512",
+    memory      = "768",
-    diskpool = "default",
+    diskpool    = "default",
-    disksize = "4300000000",
+    disksize    = "11000000000",
-    mac      = "00:00:00:13:37:22",
+    mac         = "00:00:00:13:37:22",
+    sourceimage = "https://cloud.centos.org/centos/8/x86_64/images/CentOS-8-GenericCloud-8.3.2011-20201204.2.x86_64.qcow2",
+    category    = "host-victim",
   },
-  "attacker" = {
+  "h_attacker" = {
-    name     = "attacker",
+    name        = "h_attacker",
-    vcpu     = 1,
+    vcpu        = 1,
-    memory   = "1024",
+    memory      = "1024",
-    diskpool = "default",
+    diskpool    = "default",
-    disksize = "4300000000",
+    disksize    = "5370000000",
-    mac      = "00:00:00:13:37:23",
+    mac         = "00:00:00:13:37:23",
+    sourceimage = "https://download.fedoraproject.org/pub/fedora/linux/releases/34/Cloud/x86_64/images/Fedora-Cloud-Base-34-1.2.x86_64.qcow2",
+    category    = "host-attacker",
+  },
+  "r_edge" = {
+    name        = "r_edge",
+    vcpu        = 1,
+    memory      = "768",
+    diskpool    = "default",
+    disksize    = "4300000000",
+    mac         = "00:00:00:13:37:24",
+    sourceimage = "https://download.fedoraproject.org/pub/fedora/linux/releases/33/Cloud/x86_64/images/Fedora-Cloud-Base-33-1.2.x86_64.qcow2",
+    category    = "router",
+  },
+  "r_upstream" = {
+    name        = "r_upstream",
+    vcpu        = 1,
+    memory      = "768",
+    diskpool    = "default",
+    disksize    = "4300000000",
+    mac         = "00:00:00:13:37:25",
+    sourceimage = "https://download.fedoraproject.org/pub/fedora/linux/releases/33/Cloud/x86_64/images/Fedora-Cloud-Base-33-1.2.x86_64.qcow2",
+    category    = "router",
+  },
+  "h_defender" = {
+    name        = "h_defender",
+    vcpu        = 1,
+    memory      = "1024",
+    diskpool    = "default",
+    disksize    = "5370000000",
+    mac         = "00:00:00:13:37:26",
+    sourceimage = "https://download.fedoraproject.org/pub/fedora/linux/releases/34/Cloud/x86_64/images/Fedora-Cloud-Base-34-1.2.x86_64.qcow2",
+    category    = "host-defender",
   },
 }