Run the crawler as mirrormanager and not as root.

roles/mirrormanager/crawler/files/crawler.cron

@@ -1,4 +1,4 @@
 # run the crawler twice a day
 # logs sent to /var/log/mirrormanager/crawler.log and crawl/* by default
 # 32GB of RAM is not enough for 75 threads, 40 seems to work so far
-0 */12 * * * root /usr/bin/mm2_crawler --threads 40 > /dev/null 2>&1
+0 */12 * * * mirrormanager /usr/bin/mm2_crawler --threads 40 > /dev/null 2>&1

roles/mirrormanager/crawler/tasks/main.yml

@@ -23,7 +23,7 @@
 - name: install MM configuration file
   template: src={{ roles }}/mirrormanager/frontend2/templates/mirrormanager2.cfg
             dest=/etc/mirrormanager/mirrormanager2.cfg
-            mode=600
+            mode=600 owner=mirrormanager group=mirrormanager
   tags:
   - config