Add rekey playbook

etc/kayobe/ansible/rekey-hosts.yml

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+---
+# Playbook to rotate SSH keys across the cloud. By default it will rotate the
+# standard keys used by kayobe/kolla-ansible, but it can be configured for any
+# keys.
+
+- name: Rekey hosts
+  hosts: overcloud,seed,seed-hypervisor,infra-vms
+  gather_facts: false
+  vars:
+    # The existing key is the key that is currently used to access overcloud hosts
+    existing_private_key_path: "{{ ssh_private_key_path }}"
+    existing_public_key_path: "{{ ssh_public_key_path }}"
+    # The new key is the key that will be generated by this playbook
+    new_private_key_path: "{{ ssh_private_key_path }}"
+    new_public_key_path: "{{ ssh_public_key_path }}"
+    new_key_type: "{{ ssh_key_type }}"
+    # The existing key will locally be moved to deprecated_key_path once it is replaced
+    deprecated_key_path: ~/old_ssh_key
+    rekey_users:
+      - stack
+      - kolla
+    rekey_remove_existing_key: false
+  tasks:
+    - name: Stat existing private key file
+      ansible.builtin.stat:
+        path: "{{ existing_private_key_path }}"
+      register: stat_result
+      delegate_to: localhost
+      run_once: true
+
+    - name: Fail when existing private key does not exist
+      ansible.builtin.fail:
+        msg: "No existing private key file found. Check existing_private_key_path is set correctly."
+      when:
+        - not stat_result.stat.exists
+      delegate_to: localhost
+      run_once: true
+
+    - name: Stat existing public key file
+      ansible.builtin.stat:
+        path: "{{ existing_public_key_path }}"
+      register: stat_result
+      delegate_to: localhost
+      run_once: true
+
+    - name: Fail when existing public key does not exist
+      ansible.builtin.fail:
+        msg: "No existing public key file found. Check existing_public_key_path is set correctly."
+      when:
+        - not stat_result.stat.exists
+      delegate_to: localhost
+      run_once: true
+
+    - name: Generate a new SSH key
+      community.crypto.openssh_keypair:
+        path: "{{ existing_private_key_path }}_new"
+        type: "{{ new_key_type }}"
+      delegate_to: localhost
+      run_once: true
+
+    - name: Set new authorized keys
+      vars:
+        lookup_path: "{{ existing_private_key_path }}_new.pub"
+      ansible.posix.authorized_key:
+        user: "{{ item }}"
+        state: present
+        key: "{{ lookup('file', lookup_path) }}"
+      loop: "{{ rekey_users }}"
+      become: true
+
+    - name: Locally deprecate existing key (private)
+      command: "mv {{ existing_private_key_path }} {{ deprecated_key_path }}"
+      delegate_to: localhost
+      run_once: true
+
+    - name: Locally deprecate existing key (public)
+      command: "mv {{ existing_public_key_path }} {{ deprecated_key_path }}.pub"
+      delegate_to: localhost
+      run_once: true
+
+    - name: Locally promote new key (private)
+      command: "mv {{ existing_private_key_path }}_new {{ new_private_key_path }}"
+      delegate_to: localhost
+      run_once: true
+
+    - name: Locally promote new key (public)
+      command: "mv {{ existing_private_key_path }}_new.pub {{ new_public_key_path }}"
+      delegate_to: localhost
+      run_once: true
+
+    - block:
+        - name: Stat old key file
+          ansible.builtin.stat:
+            path: "{{ deprecated_key_path }}.pub"
+          register: stat_result
+          delegate_to: localhost
+          run_once: true
+
+        - name: Fail when deprecated public key does not exist
+          ansible.builtin.fail:
+            msg: "No deprecated public key file found. Check deprecated_key_path is set correctly."
+          when:
+            - not stat_result.stat.exists
+          delegate_to: localhost
+          run_once: true
+
+        - name: Remove old key from hosts
+          vars:
+            lookup_path: "{{ deprecated_key_path }}.pub"
+          ansible.posix.authorized_key:
+            user: "{{ item }}"
+            state: absent
+            key: "{{ lookup('file', lookup_path) }}"
+          loop: "{{ rekey_users }}"
+          become: true
+      tags: remove-key
+      when: rekey_remove_existing_key | bool

releasenotes/notes/add-rekey-playbook-0065c5057b1639f8.yaml

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+---
+features:
+  - |
+    Added the ``rekey-hosts.yml`` playbook to automatically rotate the SSH 
+    keys on all hosts.