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Undercloud backups

Most of the Undercloud backup procedure is available in the TripleO official documentation site.

We will focus on the automation of backing up the resources required to restore the Undercloud in case of a failed upgrade.

All MariaDB databases on the undercloud node
MariaDB configuration file on undercloud (so we can restore databases accurately)
All glance image data in /var/lib/glance/images
All swift data in /srv/node
All data in stack user home directory

For doing this we need to be able to:

Connect to the database server as root.
Dump all databases to file.
Create a filesystem backup of several folders (and be able to access folders with restricted access).
Upload this backup to a swift container to be able to get it from the TripleO web UI.