From afb7030e444e0506414709c64c6d90c2ffb43e96 Mon Sep 17 00:00:00 2001
From: "Dustin C. Hatch" <dustin@hatch.name>
Date: Tue, 2 Jul 2024 20:45:12 -0500
Subject: [PATCH] migration: Add PostgreSQL server migration script

This script captures the steps taken to migrate from the PostgreSQL
server in the Kubernetes cluster, managed by _postgres operator_, to the
dedicated server on _db0.pyrocufflink.blue_.  The data were restored
from the backups created by _wal-e_, and then the new server was
promoted to primary.  Finally, I cleaned up the roles and databases that
are no longer needed.
---
 migration/postgresql-db.sh | 48 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 migration/postgresql-db.sh

diff --git a/migration/postgresql-db.sh b/migration/postgresql-db.sh
new file mode 100644
index 0000000..891b5b3
--- /dev/null
+++ b/migration/postgresql-db.sh
@@ -0,0 +1,48 @@
+#!/bin/sh
+
+server=db0.pyrocufflink.blue
+sudo='sudo'
+sudo_postgres='sudo -u postgres'
+#server=root@db1.local
+#sudo=''
+#sudo_postgres='runuser -u postgres --'
+
+ssh ${server} ${sudo_postgres} pg_ctl promote -D /etc/postgresql -w -t 300
+ssh ${server} ${sudo_postgres} psql <<EOF
+ALTER USER "authelia.authelia" RENAME TO authelia;
+ALTER USER "firefly-iii.firefly" RENAME TO firefly;
+ALTER USER "home-assistant.homeassistant" RENAME TO homeassistant;
+
+ALTER DATABASE authelia REFRESH COLLATION VERSION;
+ALTER DATABASE firefly REFRESH COLLATION VERSION;
+ALTER DATABASE homeassistant REFRESH COLLATION VERSION;
+ALTER DATABASE postgres REFRESH COLLATION VERSION;
+ALTER DATABASE template0 REFRESH COLLATION VERSION;
+ALTER DATABASE template1 REFRESH COLLATION VERSION;
+
+DROP DATABASE dustin;
+DROP DATABASE wger;
+
+DROP OWNED BY admin;
+DROP OWNED BY cron_admin;
+DROP OWNED BY robot_zmon;
+\c authelia
+DROP OWNED BY admin;
+DROP OWNED BY robot_zmon;
+\c firefly
+DROP OWNED BY admin;
+DROP OWNED BY robot_zmon;
+\c homeassistant
+DROP OWNED BY admin;
+DROP OWNED BY robot_zmon;
+\c template1
+DROP OWNED BY admin;
+DROP OWNED BY robot_zmon;
+DROP ROLE admin;
+DROP ROLE cron_admin;
+DROP ROLE dustin;
+DROP ROLE standby;
+DROP ROLE "wger.wger";
+DROP ROLE zalandos;
+DROP ROLE robot_zmon;
+EOF