Well it works

terraform/ceph-disks.tf

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+resource "lxd_volume" "ceph-osd-vol" {
+    pool = "default"
+    project = lxd_project.cephproject.name
+
+    name = format("ceph-osd-%d", count.index + 1)
+    count = 4
+    content_type = "block"
+    config = {
+        size = "10GiB"
+    }
+}

terraform/ceph-gen-inventory.tf

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+# generate inventory file for Ansible
+resource "local_file" "ansible_inventory" {
+  content = templatefile(
+    "hosts.j2",
+    {
+      cephmons = {for key, value in lxd_instance.ceph-mon : value.name => value.ipv4_address }
+      cephosds = {for key, value in lxd_instance.ceph-osd : value.name => value.ipv4_address }
+      jumphost = var.ansible_jumphost
+    }
+  )
+  filename = "../data/inventory"
+}

terraform/ceph-net.tf

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+resource "lxd_network" "cephnet" {
+    # project = lxd_project.cephproject.name
+    name = "cephnet"
+    type = "bridge"
+
+    config = {
+        "ipv4.address" = "10.99.99.1/24"
+        "ipv4.nat"     = "true"
+        "ipv6.address" = "fd42:474b:622d:259d::1/64"
+        "ipv6.nat"     = "true"
+    }
+}

terraform/ceph-vm.tf

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+### ceph-mon
+resource "lxd_instance" "ceph-mon" {
+  name = format("ceph-mon-%d", count.index + 1)
+  count = 4
+
+  type = "virtual-machine"
+  image = "ubuntu:jammy"
+  project = lxd_project.cephproject.name
+  profiles  = ["default", "${lxd_profile.cephprofile.name}"]
+  
+  config = {
+    "boot.autostart" = false
+  }
+
+ device {
+    name = "eth0"
+    type = "nic"
+
+    properties = {
+      nictype = "bridged"
+      parent  = "${lxd_network.cephnet.name}"
+      "ipv4.address" = format("10.99.99.%d", count.index + 10)
+    }
+  }
+
+  limits = {
+    cpu = 2
+    memory = "4GiB"
+  }
+
+  execs = {
+    "shell_cmd" = {
+      command = ["/bin/sh", "-c", "echo $PUB_KEY | tee /root/.ssh/id_ed25519.pub /root/.ssh/authorized_keys ; echo \"$PRIV_KEY\"  > /root/.ssh/id_ed25519 ; chmod 600 /root/.ssh/*"]
+
+      environment = {
+        "PUB_KEY" = file("../data/ceph_key.pub")
+        "PRIV_KEY" = file("../data/ceph_key")
+      }
+    }
+  }
+}
+
+### ceph-osd
+resource "lxd_instance" "ceph-osd" {
+  name = format("ceph-osd-%d", count.index + 1)
+  count = 4
+
+  type = "virtual-machine"
+  image = "ubuntu:jammy"
+  project = lxd_project.cephproject.name
+  profiles  = ["default", "${lxd_profile.cephprofile.name}"]
+  
+  config = {
+    "boot.autostart" = false
+  }
+
+  device {
+    name = "eth0"
+    type = "nic"
+
+    properties = {
+      nictype = "bridged"
+      parent  = "${lxd_network.cephnet.name}"
+      "ipv4.address" = format("10.99.99.%d", count.index + 20)
+    }
+  }
+
+  device {
+    name = format("ceph-osd-%d", count.index + 1)
+    type = "disk"
+    properties = {
+      source = format("ceph-osd-%d", count.index + 1)
+      pool   = "default"
+    }
+  }
+
+  limits = {
+    cpu = 2
+    memory = "4GiB"
+  }
+  execs = {
+    "shell_cmd" = {
+      command = ["/bin/sh", "-c", "echo $PUB_KEY | tee /root/.ssh/id_ed25519.pub /root/.ssh/authorized_keys ; echo -e $PRIV_KEY > /root/.ssh/id_ed25519 ; chmod 600 /root/.ssh/*"]
+
+      environment = {
+        "PUB_KEY" = file("../data/ceph_key.pub")
+        "PRIV_KEY" = file("../data/ceph_key")
+      }
+    }
+  }
+
+}

terraform/hosts.j2

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+[ceph-mon]
+%{ for name, ip in cephmons ~}
+${name} ansible_ssh_host=${ip} ansible_ssh_common_args='-J ${jumphost} -oStrictHostKeyChecking=no -i ../data/ceph_key' ansible_ssh_user='root'
+%{ endfor ~}
+
+[ceph-osd]
+%{ for name, ip in cephosds ~}
+${name} ansible_ssh_host=${ip} ansible_ssh_common_args='-J ${jumphost} -oStrictHostKeyChecking=no -i ../data/ceph_key' ansible_ssh_user='root'
+%{ endfor ~}

terraform/init.tf

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+terraform {
+  required_providers {
+    lxd = {
+      source = "terraform-lxd/lxd"
+    }
+  }
+}
+
+resource "lxd_project" "cephproject" {
+  name        = "ceph"
+  description = "Terraform provider example project"
+  config = {
+    "features.storage.volumes" = false
+    "features.images"          = false
+    "features.profiles"        = false
+    "features.storage.buckets" = false
+    "features.networks"        = true
+  }
+}
+
+resource "lxd_profile" "cephprofile" {
+  name = "cephprofile"
+
+  device {
+    name = "eth0"
+    type = "nic"
+
+    properties = {
+      nictype = "bridged"
+      parent  = "${lxd_network.cephnet.name}"
+    }
+  }
+
+  device {
+    type = "disk"
+    name = "root"
+
+    properties = {
+      pool = "default"
+      path = "/"
+    }
+  }
+}

terraform/terraform.tfvars

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+ansible_jumphost = "selded"
+ceph_subnet = "10.99.99"