treasuremap/tools/upgrades/postgresql/README.md

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# PostgreSQL Patroni Upgrade Scripts
Upgrading a live site from the old, unclustered PostgreSQL chart to the newer,
Patroni-managed version takes a small amount of out-of-band scripting to ensure
a smooth hands-free upgrade.
## Prior to upgrade
The ``patroni_endpoint_cleaner_unit.sh`` script should be run prior to upgrading
the postgresql chart. It installs a systemd unit which in turn will run
the ``patroni_endpoint_cleaner.sh`` script. During chart upgrade, the script
will delete the postgresql endpoints, allowing Patroni to recreate them with the
appropriate annotations for it to manage them ongoing.
This documentation project outlines a reference architecture for automated
cloud provisioning and management, leveraging a collection of interoperable
open-source tools.
## Post upgrade
After the chart upgrade is complete, the ``patroni_endpoint_cleaner_remove.sh``
script should be run. This will simply clean up the systemd unit that was
created previously.