Ubuntu 24.04
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PostgreSQL 16 : Remote Connection2024/05/30


It's possible to connect to PostgreSQL Server only from Localhost by default like here,
however if you'd like to connect to PostgreSQL from Remote hosts, change settings like follows.

[1] There are many authentication methods on PostgreSQL, though.
On this example, Configure scram-sha-256 password method.
vi /etc/postgresql/16/main/postgresql.conf
# line 60 : uncomment and change

listen_addresses = '
vi /etc/postgresql/16/main/pg_hba.conf
# add to last line
# specify network range you allow to connect on [ADDRESS] section
# if allow all, specify []
host    all             all                scram-sha-256

systemctl restart postgresql

[2] To connect to a PostgreSQL Database from remote hosts, set password for each PostgreSQL user.
# connect to own database

psql -d testdb

psql (16.2 (Ubuntu 16.2-1ubuntu4))
Type "help" for help.

# set or change own password
testdb=> \password
Enter new password:
Enter it again:
testdb=> \q

# also possible to set or change password for any users with PostgreSQL admin user

psql -c "alter user ubuntu with password 'password';"

[3] Verify settings to connect to PostgreSQL Database with password from remote hosts.
psql -h www.srv.world -d testdb -U ubuntu

Password for user ubuntu:   # password
psql (16.2 (Ubuntu 16.2-1ubuntu4))
SSL connection (protocol: TLSv1.3, cipher: TLS_AES_256_GCM_SHA384, compression: off)
Type "help" for help.

testdb=> # connected
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