create user sympa with password 'nevairbe';
create database sympa with owner = sympa;
List clusters:
postgres@buster:~$ pg_lsclusters Ver Cluster Port Status Owner Data directory Log file 9.4 main 5432 online postgres /var/lib/postgresql/9.4/main /var/log/postgresql/postgresql-9.4-main.log 11 main 5433 online postgres /var/lib/postgresql/11/main /var/log/postgresql/postgresql-11-main.log