Recently I have been trying to debug some problems with cloud-init in the alpha versions of cloud images for CentOS 7 and Fedora 21. What I have found is that it’s not so straight forward to figure out how to set up debug logging. The defaults (defined in /etc/cloud/cloud.cfg.d/05_logging.cfg ) for some reason don’t really capture the debug output in /var/log/cloud-init.log. Luckily, though, on systemd based systems we can get most of that output by using journalctl.
