setup/doc/postgres-upgrade-pg_upgrade.md

Upgrade using pg_upgrade

• check clusters

pg_lsclusters

• do

sudo apt update
sudo apt upgrade postgresql-xy

• install relevant packages

sudo apt-get install postgresql-server-dev-13

• make a backup

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

• check installed extensions on old version

sudo -u postgres psql -p 5432 postgres
\dx

• install extension on new version

sudo apt install postgresql-13-postgis-3 --no-install-recommends
sudo -u postgres psql -p 5433 postgres
\dx
CREATE EXTENSION postgis;
CREATE EXTENSION hstore;

• stop all clusters

sudo systemctl stop postgresql
systemctl status postgresql
pg_lsclusters

• migrate

sudo -iu postgres /usr/lib/postgresql/13/bin/pg_upgrade \
-o "-c config_file=/etc/postgresql/11/main/postgresql.conf" \
--old-datadir=/var/lib/postgresql/11/main/ \
-O "-c config_file=/etc/postgresql/13/main/postgresql.conf" \
--new-datadir=/var/lib/postgresql/13/main/ \
--old-bindir=/usr/lib/postgresql/11/bin \
--new-bindir=/usr/lib/postgresql/13/bin --check --jobs=4

• TODO tbc

• uninstall the previous version

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