docs: update home/server/home/postgres

home/server/home/postgres.md

@@ -2,7 +2,7 @@
 title: Postgres
 description: 
 published: true
-date: 2025-11-21T17:22:18.109Z
+date: 2025-11-21T17:28:17.490Z
 tags: 
 editor: markdown
 dateCreated: 2025-11-21T17:22:18.109Z
@@ -16,3 +16,42 @@ stop the running instance
 ```
 sudo systemctl stop postgresql
 ```
+
+install the upgrade tool
+```
+sudo pacman -S postgresql-old-upgrade
+```
+
+Check where the installed files are with 
+```
+pacman -Ql postgresql-old-upgrade
+```
+
+Initalize the new database 
+```
+sudo -u postgres initdb -D /var/lib/postgres/data_18 --no-data-checksums
+```
+
+Do the upgrade 
+-b previous binaries 
+-d previous data folder 
+```
+sudo -u postgres \
+  pg_upgrade \
+  -b /opt/pgsql-17/bin/ \
+  -B /usr/bin/ \
+  -d /var/lib/postgres/data \ 
+  -D /var/lib/postgres/data_18 \
+  -O "-c timescaledb.restoring='on'"
+```
+
+Rename the data folder 
+```
+mv /var/lib/postgres/data  /var/lib/postgres/data_old
+mv /var/lib/postgres/data_18  /var/lib/postgres/data
+```
+
+start postgres 
+```
+sudo systemctl start postgresql
+```