How to organize synchronous PostgreSQL database replication on geographically remote servers?

Question

PostgreSQL

Good afternoon!
I must say right away that I am new to PostgreSQL.
There are 2 remote servers with PostgreSQL on board. The local addresses are different (192.168.1.x and 192.168.100.y), but they see each other through the l2tp tunnel + IPsec.
It is necessary to make sure that when writing to one database, the same record is replicated to another database.
Schematic representation of the structure:
How will it be more convenient to implement it?

Answer 1

Get it and set it up.
According to the network settings - any perversions, as long as you have an open tcp port (the one on which the master listens, usually 5432) from the replica to the master.
Synchronous_standby_names is responsible for synchronous replication when synchronous_commit is enabled
Note that synchronous replication with geographic distribution is a pain . It's in bold type. Both in terms of performance and stability of work on writing data - if there is a little something with the network, then the leading database will not write anything until you fix the network. Because synchronous replication.