CentOS Stream 8
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PostgreSQL 12 : Remote Connection2021/06/25

It's possible to connect to PostgreSQL Server only from Localhost by default like here,
but 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 MD5 password method.
[root@www ~]#
vi /var/lib/pgsql/data/postgresql.conf
# line 59 : uncomment and change

# if listens only IPv4, set ''

listen_addresses = '
[root@www ~]#
vi /var/lib/pgsql/data/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               ident
# IPv6 local connections:
host    all             all             ::1/128                 ident
# Allow replication connections from localhost, by a user with the
# replication privilege.
local   replication     all                                     peer
host    replication     all               ident
host    replication     all             ::1/128                 ident
# specify network range you allow to connect on [ADDRESS] section
# if allow all, specify []
host    all             all                md5

[root@www ~]#
systemctl restart postgresql

[2] If Firewalld is running, allow PostgreSQL service.
[root@www ~]#
firewall-cmd --add-service=postgresql --permanent

[root@www ~]#
firewall-cmd --reload

[3] To connect to a PostgreSQL Database with MD5 password, set password for each PostgreSQL user.
# connect to own database

[cent@www ~]$
psql -d testdb

psql (12.7)
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@www ~]$
psql -c "alter user cent with password 'password';"

[4] Verify settings to connect to PostgreSQL Database with MD5 password from remote hosts.
[root@node01 ~]#
psql -h www.srv.world -d testdb -U cent

Password for user cent:   # password
psql (12.7)
Type "help" for help.

testdb=> # connected
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