Run the hook only if the mongodb.pem file does not exist.

mongodb-org/tasks/mongodb-letsencrypt-acmetool.yml

@@ -6,8 +6,13 @@
   - name: Install a script that fix the letsencrypt certificate for mongodb and then reload the service
     template: src=mongodb-letsencrypt-acmetool.sh dest={{ letsencrypt_acme_services_scripts_dir }}/mongodb owner=root group=root mode=4555
 
+  - name: Verify if the mongodb pem file exists
+    stat: path={{ mongodb_ssl_certkey_file }}
+    register: mongodb_pem
+
   - name: Copy the certificate and its key where the mongo server expects it
     command: "{{ letsencrypt_acme_services_scripts_dir }}/mongodb"
+    when: mongodb_pem.stat.exists
 
   when:
     - mongodb_ssl_letsencrypt_managed