/etc/rc.confまたは/etc/rc.conf.localに記述

postgresql_enable="YES"
postgresql_data="/usr/local/pgsql/DATA"

data領域はzfsで別にとるので、disk追加してpool作成

# zpool create zdata /dev/adaxx
# zfs create -o mountpoint=/usr/local/pgsql zdata/pgsql
# mkdir /usr/local/pgsql/DATA
# chown postgres:postgres /usr/local/pgsql/DATA

# service postgresql initdb
The files belonging to this database system will be owned by user "postgres".
This user must also own the server process.

The database cluster will be initialized with locales
  COLLATE:  C
  CTYPE:    C.UTF-8
  MESSAGES: C.UTF-8
  MONETARY: C.UTF-8
  NUMERIC:  C.UTF-8
  TIME:     C.UTF-8
The default text search configuration will be set to "english".

Data page checksums are disabled.

fixing permissions on existing directory /usr/local/pgsql/DATA ... ok
creating subdirectories ... ok
selecting dynamic shared memory implementation ... posix
selecting default max_connections ... 100
selecting default shared_buffers ... 128MB
selecting default time zone ... Japan
creating configuration files ... ok
running bootstrap script ... ok
performing post-bootstrap initialization ... ok
syncing data to disk ... ok

initdb: warning: enabling "trust" authentication for local connections
You can change this by editing pg_hba.conf or using the option -A, or
--auth-local and --auth-host, the next time you run initdb.

Success. You can now start the database server using:

    /usr/local/bin/pg_ctl -D /usr/local/pgsql/DATA -l logfile start

外部からの接続を /usr/local/pgsql/data/pg_hba.conf に設定します¹⁾

# TYPE  DATABASE        USER            CIDR-ADDRESS            METHOD
host    all             all             192.168.0.0/24          md5

postgresql.confのlisten_addresses も変更

listen_addresses = '*'

PostgrSQLを起動

# service postgresql start

# psql -h localhost -U postgres
psql (13.11)
Type "help" for help.

postgres=# CREATE ROLE ncadm WITH LOGIN PASSWORD 'ncadmpassword';
CREATE ROLE
postgres=# CREATE DATABASE nc WITH OWNER ncadm TEMPLATE template0 
postgres=# ENCODING UTF8 LC_COLLATE 'ja_JP.UTF-8' LC_CTYPE 'ja_JP.UTF-8';
CREATE DATABASE