diff --git a/playbook.yaml b/playbook.yaml
index 76c628c..8c4ccd3 100644
--- a/playbook.yaml
+++ b/playbook.yaml
@@ -2,7 +2,7 @@
 
 # execute this role
 - name: "install and configure the Zabbix Agent"
-  serial: 2
+  serial: 4
   hosts: "all"
   become: true
   tasks:
diff --git a/tasks/main.yaml b/tasks/main.yaml
index dd59f2a..0ec89d6 100644
--- a/tasks/main.yaml
+++ b/tasks/main.yaml
@@ -165,10 +165,12 @@
 # syslog
 - name: "syslog - install"
   ansible.builtin.include_tasks: "syslog/install.yaml"
+  when: "ansible_os_family == 'Debian'"
   tags: "syslog"
 
 - name: "syslog - config"
   ansible.builtin.include_tasks: "syslog/config.yaml"
+  when: "ansible_os_family == 'Debian'"
   tags: "syslog"
 
 # flush handler