Use SIGUSR2 instead

roles/slurmdb-config/templates/slurmdblog.j2

@@ -14,7 +14,7 @@
  create 640 slurm root 
 {% if ansible_os_family == 'RedHat' and ansible_distribution_version >= '7' %}
   postrotate
-	systemctl kill -s HUP --kill-who=main slurmdbd
+        pkill -x --signal SIGUSR2 slurmdbd
 {% else %}
  postrotate /etc/init.d/slurmdbd reconfig 
 {% endif %}