Upgrading ISC Kea DHCPv4 Server on Ubuntu 22.04

For the most part, the documentation for ISC Kea DHCPv4 Server on Ubuntu 22.04 LTS while using PostgreSQL as a backend is fine.

However, when running a PostgreSQL instance on the same server as ISC's Kea DHCPv4 Server on Ubuntu 22.04 LTS using the defaults, the PostgreSQL database is only accessable via the Unix socket /var/run/postgresql. As such, the below adaptations to the regularly documented commands are required to run the kea-admin db-* commands.

# Check version
sudo -u _kea kea-admin db-version pgsql -u _kea -n _kea -h /var/run/postgresql

# Upgrade schema
sudo -u _kea kea-admin db-upgrade pgsql -u _kea -n _kea -h /var/run/postgresql