Postgres 13 replication

Master node

Create role with replication permission

CREATE ROLE replica_user WITH REPLICATION LOGIN PASSWORD '<PLAIN_PASSWD>';

Update pg_hba.conf to make connection between master and replica nodes

...
host  replication   replica_user  172.16.10.0/24   md5
...

Check backup/steaming

SELECT client_addr, state FROM pg_stat_replication;

Replica node

Stop postgresql instance

Remove old data from PG_DATA directory

Run backup

pg_basebackup -h 194.195.208.82 -U replica_user -X stream -C -S replica_1 -v -R -W -D $PG_DATA