Initial update config

.gitignore

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+.DS_Store
+**/.DS_Store
+._.DS_Store
+**/._.DS_Store

inventory.ini

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+[k3s_servers]
+birdfeeder1.home.nest # rpi5-1
+birdfeeder2.home.nest # rpi5-2
+birdfeeder3.home.nest # rpi5-3
+
+[k3s_agents_raspbian]
+chickadee.home.nest # rpi4-1
+
+[k3s_agents_nixos]
+robin.home.nest  # nixos-1

playbooks/update-k3s-nodes.yaml

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+---
+- name: Update Cluster Nodes
+  hosts: all
+  serial: 1  # CRITICAL: Processes one node entirely before moving to the next
+  become: yes
+  tasks:
+    - name: Determine an available k3s control plane node
+      set_fact:
+        # Picks the first server node that is NOT the one currently being updated
+        active_master: "{{ groups['k3s_servers'] | difference([inventory_hostname]) | first }}"
+      delegate_to: localhost
+
+    - name: Check if updates are needed (Debian/Raspbian)
+      apt:
+        upgrade: dist
+        update_cache: yes
+      register: apt_status
+      when: inventory_hostname in groups['k3s_servers'] or inventory_hostname in groups['k3s_agents_raspbian']
+
+    # For NixOS, we just run the upgrade and check if a reboot is flagged.
+    - name: Run NixOS update command
+      command: nixos-rebuild switch --upgrade
+      register: nixos_status
+      when: inventory_hostname in groups['k3s_agents_nixos']
+
+    - name: Check for Raspbian reboot required flag
+      stat:
+        path: /var/run/reboot-required
+      register: reboot_required
+      when: inventory_hostname not in groups['k3s_agents_nixos']
+
+    # --- THE KUBERNETES DRAIN PHASE ---
+    - name: Drain the node safely
+      command: >
+        k3s kubectl drain {{ inventory_hostname }}
+        --ignore-daemonsets
+        --delete-emptydir-data
+        --force
+        --grace-period=90
+        --timeout=5m
+      delegate_to: "{{ active_master }}"
+      when: (reboot_required.stat.exists | default(false)) or ('changed' in nixos_status | default({}))
+      ignore_errors: yes # Prevents a stubborn pod from halting the entire cluster update
+
+    # --- THE REBOOT PHASE ---
+    - name: Reboot the node
+      reboot:
+        post_reboot_delay: 180 # Give k3s and Longhorn time to initialize
+      when: (reboot_required.stat.exists | default(false)) or ('changed' in nixos_status | default({}))
+
+    # --- THE UNCORDON PHASE ---
+    - name: Uncordon the node
+      command: k3s kubectl uncordon {{ inventory_hostname }}
+      delegate_to: "{{ active_master }}"
+      when: (reboot_required.stat.exists | default(false)) or ('changed' in nixos_status | default({}))