diff --git a/infrastructure-playbooks/take-over-existing-cluster.yml b/infrastructure-playbooks/take-over-existing-cluster.yml
index 8347c1bef..08b31bd59 100644
--- a/infrastructure-playbooks/take-over-existing-cluster.yml
+++ b/infrastructure-playbooks/take-over-existing-cluster.yml
@@ -27,7 +27,8 @@
     - include_vars: group_vars/all.yml
 
     - name: get the name of the existing ceph cluster
-      shell: "ls /etc/ceph/*.conf"
+      shell: |
+        grep -lE '\[global\]|fsid' /etc/ceph/*.conf
       changed_when: false
       register: ceph_conf