ceph: improve cluster setup

Remove separate NetBox lookups. Explicitly allow connections between
cluster nodes. Tigthen temporary allowed IPv6 ranges.

roles/ceph/tasks/main.yml

@@ -1,17 +1,17 @@
+- name: Get all nodes in my cluster
+  set_fact:
+    nodes: "{{ groups['cluster_'+cluster] | map('extract', hostvars) }}"
+
 - name: Configure /etc/hosts
   template:
     dest: /etc/hosts
     src: hosts.j2
 
-- name: Get cluster
-  set_fact:
-    cluster: "{{ query('netbox.netbox.nb_lookup', 'clusters', raw_data=true, api_filter='name='~cluster) | first }}"
-
 - name: Generate my SSH key
   openssh_keypair:
     path: /root/.ssh/id_ed25519
     type: ed25519
-    comment: "root@{{ ansible_hostname }}"
+    comment: "root@{{ inventory_hostname }}"
   register: my_key
 
 - name: Deploy my key on other nodes
@@ -20,7 +20,7 @@
     key: "{{ my_key.public_key }}"
     comment: "{{ my_key.comment }}"
   delegate_to: "{{ item }}"
-  loop: "{{ query('netbox.netbox.nb_lookup', 'devices', api_filter='cluster_id='~cluster.id, raw_data=true) | map(attribute='name') }}"
+  loop: "{{ nodes | map(attribute='inventory_hostname') }}"
 
 - name: Install required packages
   package: