setup/doc/postgres-upgrade-pg_upgradecluster.md

Upgrade using pg_upgradecluster

• check clusters

pg_lsclusters

• do

sudo apt update
sudo apt upgrade postgresql-xy

• install relevant packages

sudo apt-get install postgresql-server-dev-xy

• make a backup

cd ~
time sudo -u postgres pg_dumpall > ~/pg_dumpall-bckp-all-2023-08-07

• check installed extensions on old version

sudo -u postgres psql -p 5432 postgres
\dx

• OPTION: install extension on new version

sudo apt install postgresql-xy-postgis-3 --no-install-recommends
//OPTION: sudo -u postgres psql -p 5432 postgres
//OPTION: sudo -u postgres psql -p 5433 postgres
\dx
CREATE EXTENSION postgis;
CREATE EXTENSION hstore;
\q

• stop all clusters

sudo systemctl stop postgresql
systemctl status postgresql
pg_lsclusters

• migrate

sudo systemctl stop postgresql@13-main
sudo -u postgres pg_dropcluster 13 main
sudo -u postgres pg_upgradecluster 11 main
sudo systemctl daemon-reload
systemctl status postgresql@13-main
pg_lsclusters

• drop the old cluster:

sudo -u postgres pg_dropcluster 11 main

• uninstall the previous version

sudo apt purge postgresql-11* postgresql-client-11*
sudo apt autoremove
apt list --installed | grep postgresql-11 postgresql-client-11*

• do

sudo pg_ctlcluster 13 main stop
pg_lsclusters
sudo pg_ctlcluster 13 main start
pg_lsclusters

• vacuum

sudo -u postgres vacuumdb --all --analyze-only
sudo -u postgres vacuumdb --all