Starting from version 9, it is possible to migrate a complete cluster (users and databases) using pg_upgrade. It is useful to migrate from a minor version to a major version, for example from PostgreSQl 9.6 to PostgreSQL 10. This way to work is safe and faster than dump/restore, because pg_upgrade migrates PostgreSQL pages in a binary way and it's not necessary rebuild any indexes.
As mentioned above, another approach may be to use pglogical, pglogical is a logical replication system implemented entirely as a PostgreSQL extension. Fully integrated, it requires no triggers or external programs. This alternative to physical replication is a highly efficient method of replicating data ...
