[centos@centos-7-ci-cc ~]$ sudo tail -f /var/log/cloud-init.log
...
2018-10-17 21:54:06,826 - helpers.py[DEBUG]: Running config-package-update-upgrade-install using lock (<FileLock using file '/var/lib/cloud/instances/21697d2c-fcdd-4c36-ba88-275b78e546a7/sem/config_package_update_upgrade_install'>)
...
2018-10-17 21:54:06,988 - helpers.py[DEBUG]: Running update-sources using lock (<FileLock using file '/var/lib/cloud/instances/21697d2c-fcdd-4c36-ba88-275b78e546a7/sem/update_sources'>)
...
2018-10-17 21:54:07,006 - util.py[DEBUG]: Running command ['yum', '-t', '-y', 'makecache'] with allowed return codes [0] (shell=False, capture=False)
...
2018-10-17 22:00:06,125 - util.py[DEBUG]: Running command ['yum', '-t', '-y', 'upgrade'] with allowed return codes [0] (shell=False, capture=False)