diff --git a/ansible/configuration/fail2ban/config-f2b-protect-sshd.yaml b/ansible/configuration/fail2ban/config-f2b-protect-sshd.yaml
index 747a007..529f945 100644
--- a/ansible/configuration/fail2ban/config-f2b-protect-sshd.yaml
+++ b/ansible/configuration/fail2ban/config-f2b-protect-sshd.yaml
@@ -1,6 +1,6 @@
 ---
 - name: install fail2ban and configure sshd
-  hosts: "{{ hosts }}"
+  hosts: "{{ my_hosts | d([]) }}"
   become: yes
   tasks:
   - name: install fail2ban
diff --git a/ansible/configuration/ssh/config-add-sshkey.yaml b/ansible/configuration/ssh/config-add-sshkey.yaml
index 7cb376f..3e19461 100644
--- a/ansible/configuration/ssh/config-add-sshkey.yaml
+++ b/ansible/configuration/ssh/config-add-sshkey.yaml
@@ -1,6 +1,6 @@
 ---
 - name: add ssh key
-  hosts: "{{ hosts }}"
+  hosts: "{{ my_hosts | d([]) }}"
   become: yes
   tasks:
   - name: install public keys
diff --git a/ansible/deployment/portainer/deploy-portainer.yaml b/ansible/deployment/portainer/deploy-portainer.yaml
index a653f9d..6cb288d 100644
--- a/ansible/deployment/portainer/deploy-portainer.yaml
+++ b/ansible/deployment/portainer/deploy-portainer.yaml
@@ -1,6 +1,6 @@
 ---
 - name: deploy portainer-ce latest
-  hosts: "{{ hosts }}"
+  hosts: "{{ my_hosts | d([]) }}"
   become: yes
   become_user: "{{ lookup('env','USER') }}"
   tasks:
diff --git a/ansible/deployment/traefik/deploy-traefik.yaml b/ansible/deployment/traefik/deploy-traefik.yaml
index fe64d1d..042baf2 100644
--- a/ansible/deployment/traefik/deploy-traefik.yaml
+++ b/ansible/deployment/traefik/deploy-traefik.yaml
@@ -1,6 +1,6 @@
 ---
 - name: deploy traefik v2.5
-  hosts: "{{ hosts }}"
+  hosts: "{{ my_hosts | d([]) }}"
   become: yes
   tasks:
   - name: deploy traefik
diff --git a/ansible/installation/inst-core.yaml b/ansible/installation/inst-core.yaml
index c69a839..a3b91bc 100644
--- a/ansible/installation/inst-core.yaml
+++ b/ansible/installation/inst-core.yaml
@@ -1,5 +1,5 @@
 - name: install core packages
-  hosts: "{{ hosts }}"
+  hosts: "{{ my_hosts | d([]) }}"
   become: yes
   tasks:
   - name: install core packages
diff --git a/ansible/installation/inst-docker-ubuntu.yaml b/ansible/installation/inst-docker-ubuntu.yaml
index af64193..dcf6113 100644
--- a/ansible/installation/inst-docker-ubuntu.yaml
+++ b/ansible/installation/inst-docker-ubuntu.yaml
@@ -1,6 +1,6 @@
 ---
 - name: install docker
-  hosts: "{{ hosts }}"
+  hosts: "{{ my_hosts | d([]) }}"
   become: yes
   tasks:
     - name: install docker dependencies
diff --git a/ansible/installation/inst-microk8s.yaml b/ansible/installation/inst-microk8s.yaml
index d7533f3..4b917f9 100644
--- a/ansible/installation/inst-microk8s.yaml
+++ b/ansible/installation/inst-microk8s.yaml
@@ -1,6 +1,6 @@
 ---
 - name: install microk8s
-  hosts: "{{ hosts }}"
+  hosts: "{{ my_hosts | d([]) }}"
   become: yes
   tasks:
     - name: install microk8s
diff --git a/ansible/installation/inst-vm-core.yaml b/ansible/installation/inst-vm-core.yaml
index 4cfeaac..87cb698 100644
--- a/ansible/installation/inst-vm-core.yaml
+++ b/ansible/installation/inst-vm-core.yaml
@@ -1,6 +1,6 @@
 ---
 - name: install core packages for virtual machines
-  hosts: "{{ hosts }}"
+  hosts: "{{ my_hosts | d([]) }}"
   become: yes
   tasks:
   - name: install packages
diff --git a/ansible/installation/inst-wireguard.yaml b/ansible/installation/inst-wireguard.yaml
index 90f1a5f..b12cb3d 100644
--- a/ansible/installation/inst-wireguard.yaml
+++ b/ansible/installation/inst-wireguard.yaml
@@ -1,6 +1,6 @@
 ---
 - name: install wireguard
-  hosts: "{{ hosts }}"
+  hosts: "{{ my_hosts | d([]) }}"
   become: yes
   tasks:
     - name: install wireguard
diff --git a/ansible/installation/inst-zsh.yaml b/ansible/installation/inst-zsh.yaml
index 68d570e..2994b56 100644
--- a/ansible/installation/inst-zsh.yaml
+++ b/ansible/installation/inst-zsh.yaml
@@ -1,6 +1,6 @@
 ---
 - name: install zsh
-  hosts: "{{ hosts }}"
+  hosts: "{{ my_hosts | d([]) }}"
   become: yes
   tasks:
     - name: install zsh
diff --git a/ansible/maintenance/maint-diskspace.yaml b/ansible/maintenance/maint-diskspace.yaml
index fb17ad6..6414c31 100644
--- a/ansible/maintenance/maint-diskspace.yaml
+++ b/ansible/maintenance/maint-diskspace.yaml
@@ -1,6 +1,6 @@
 ---
 - name: check disk space
-  hosts: "{{ hosts }}"
+  hosts: "{{ my_hosts | d([]) }}"
   tasks:
     - name: get disk usage
       ansible.builtin.command: df -h
diff --git a/ansible/maintenance/maint-docker-clean.yaml b/ansible/maintenance/maint-docker-clean.yaml
index 00c4e07..e693aa5 100644
--- a/ansible/maintenance/maint-docker-clean.yaml
+++ b/ansible/maintenance/maint-docker-clean.yaml
@@ -1,6 +1,6 @@
 ---
 - name: clean docker
-  hosts: "{{ hosts }}"
+  hosts: "{{ my_hosts | d([]) }}"
   tasks:
     - name: prune non-dangling images
       community.docker.docker_prune:
diff --git a/ansible/maintenance/maint-reboot-required.yaml b/ansible/maintenance/maint-reboot-required.yaml
index 6ef1e4e..52c6442 100644
--- a/ansible/maintenance/maint-reboot-required.yaml
+++ b/ansible/maintenance/maint-reboot-required.yaml
@@ -1,6 +1,6 @@
 ---
 - name: check if system reboot is required
-  hosts: "{{ hosts }}"
+  hosts: "{{ my_hosts | d([]) }}"
   become: yes
   tasks:
     - name: check if system reboot is required
diff --git a/ansible/maintenance/maint-reboot.yaml b/ansible/maintenance/maint-reboot.yaml
index 4aa1913..5748a5b 100644
--- a/ansible/maintenance/maint-reboot.yaml
+++ b/ansible/maintenance/maint-reboot.yaml
@@ -1,6 +1,6 @@
 ---
 - name: reboot machine
-  hosts: "{{ hosts }}"
+  hosts: "{{ my_hosts | d([]) }}"
   become: yes
   tasks:
   - name: reboot machine
diff --git a/ansible/notification/notify-discord.yaml b/ansible/notification/notify-discord.yaml
index 7f952ce..ecc7c26 100644
--- a/ansible/notification/notify-discord.yaml
+++ b/ansible/notification/notify-discord.yaml
@@ -11,7 +11,7 @@
 
 - name: notify discord
 
-  hosts: "{{ hosts }}"
+  hosts: "{{ my_hosts | d([]) }}"
 
   vars:
     # The name that will be shown as sender of the notification. Note