Add Pi-hole configuration to README with details on syncing blocking state across HA DNS nodes. #1588

Author: CCOSTAN

config/packages/README.md

@@ -83,6 +83,7 @@ When a package has a dedicated blog post or video, I link it right inside the YA
 | [phynplus.yaml](phynplus.yaml) | Installing Phyn Plus and wiring its leak events into HA automations. | [Blog](https://www.vcloudinfo.com/2020/05/phyn-plus-smart-water-shutoff-device.html) |
 | [powerwall.yaml](powerwall.yaml) | Monitoring Tesla Powerwall health + what to automate when the grid drops. | [Blog](https://www.vcloudinfo.com/2018/01/going-green-to-save-some-green-in-2018.html) |
 | [vacuum.yaml](vacuum.yaml) | Keeping Neato/Dreame bots smart with HA scenes and maintenance timers. | [Blog](https://www.vcloudinfo.com/2020/05/home-assistant-neato-vacuum-automation.html) |
+| [pihole_ha.yaml](pihole_ha.yaml) | Sync Pi-hole blocking state across HA DNS nodes. | |
 | [grafana.yaml.disabled](grafana.yaml.disabled) | Rendering Grafana dashboards to images for Lovelace and social posts. | [Blog](https://www.vcloudinfo.com/2018/01/going-green-to-save-some-green-in-2018.html) · [Blog](https://www.vcloudinfo.com/2018/09/re-installing-tesla-solar-panels-again.html) · [Video](https://youtu.be/BartadUzGOA) |
 | [august.yaml](august.yaml) | Smart lock control and status from HA. | [YouTube short](https://youtu.be/UdcCeAyo9Ak?si=O-f607NHbRLKZxao) |
 

config/packages/pihole_ha.yaml

@@ -0,0 +1,63 @@
+######################################################################
+# @CCOSTAN - Follow Me on X
+# For more info visit https://www.vcloudinfo.com/click-here
+# Original Repo : https://github.com/CCOSTAN/Home-AssistantConfig
+# -------------------------------------------------------------------
+# Pi-hole HA Sync - Mirror blocking state across DNS nodes
+#  Keep Pi-hole blocking on docker_10 and docker_14 in lockstep.
+# -------------------------------------------------------------------
+# Notes: Uses switch.pi_hole + switch.pi_hole_2 from the Pi-hole integration.
+######################################################################
+
+automation:
+  - id: pihole_ha_sync_blocking_state
+    alias: "Pi-hole HA Sync - Blocking State"
+    description: "Mirror Pi-hole blocking state between primary and secondary DNS nodes."
+    trigger:
+      - platform: state
+        entity_id:
+          - switch.pi_hole
+          - switch.pi_hole_2
+    action:
+      - choose:
+          - conditions:
+              - condition: template
+                value_template: >-
+                  {{ trigger.entity_id == 'switch.pi_hole'
+                     and trigger.to_state.state == 'off'
+                     and states('switch.pi_hole_2') != 'off' }}
+            sequence:
+              - service: switch.turn_off
+                target:
+                  entity_id: switch.pi_hole_2
+          - conditions:
+              - condition: template
+                value_template: >-
+                  {{ trigger.entity_id == 'switch.pi_hole'
+                     and trigger.to_state.state == 'on'
+                     and states('switch.pi_hole_2') != 'on' }}
+            sequence:
+              - service: switch.turn_on
+                target:
+                  entity_id: switch.pi_hole_2
+          - conditions:
+              - condition: template
+                value_template: >-
+                  {{ trigger.entity_id == 'switch.pi_hole_2'
+                     and trigger.to_state.state == 'off'
+                     and states('switch.pi_hole') != 'off' }}
+            sequence:
+              - service: switch.turn_off
+                target:
+                  entity_id: switch.pi_hole
+          - conditions:
+              - condition: template
+                value_template: >-
+                  {{ trigger.entity_id == 'switch.pi_hole_2'
+                     and trigger.to_state.state == 'on'
+                     and states('switch.pi_hole') != 'on' }}
+            sequence:
+              - service: switch.turn_on
+                target:
+                  entity_id: switch.pi_hole
+    mode: single