PostgreSQL 15 : Remote Connection2023/04/28

	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 examaple, Configure scram-sha-256 password method.

root@www:~#

vi /etc/postgresql/15/main/postgresql.conf

# line 60 : uncomment and change

listen_addresses = '

root@www:~#

vi /etc/postgresql/15/main/pg_hba.conf

# add to the end

.....
.....
# TYPE  DATABASE        USER            ADDRESS                 METHOD

# "local" is for Unix domain socket connections only
local   all             all                                     peer
# IPv4 local connections:
host    all             all             127.0.0.1/32            scram-sha-256
# IPv6 local connections:
host    all             all             ::1/128                 scram-sha-256
# Allow replication connections from localhost, by a user with the
# replication privilege.
local   replication     all                                     peer
host    replication     all             127.0.0.1/32            scram-sha-256
host    replication     all             ::1/128                 scram-sha-256

# specify network range you allow to connect on [ADDRESS] section
# if allow all, specify [0.0.0.0/0]
host    all             all             10.0.0.0/24             scram-sha-256

root@www:~#

systemctl restart postgresql

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

# connect to own database

ubuntu@www:~$

psql -d testdb

psql (15.2 (Ubuntu 15.2-1))
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

postgres@dlp:~$

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

ALTER ROLE

[3]	Verify settings to connect to PostgreSQL Database with password from remote hosts.

root@node1:~#

psql -h www.srv.world -d testdb -U ubuntu

Password for user ubuntu:   # password
psql (15.2 (Ubuntu 15.2-1))
SSL connection (protocol: TLSv1.3, cipher: TLS_AES_256_GCM_SHA384, compression: off)
Type "help" for help.

testdb=> # connected

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