.pgpass not working ( centos7, pgagent_96 )

Hi, .pgpass seems to be not working.
Could you check my pgagent setting?

OS : centos 7 ( I did not disable selinux )
Database : postgresql 9.6.5
pgagent : pgagent_96 3.4.0-9.rhel7 ( installed package using yum )

1. I logged on centos server as user 'frank'

2. Before starting pgagent, I checked status of pgagent. ( I did not
enable pgagent_96 service. )
[frank(at)web]$ systemctl status pgagent_96.service
● pgagent_96.service - PgAgent for PostgreSQL 9.6
Loaded: loaded (/usr/lib/systemd/system/pgagent_96.service; disabled;
vendor preset: disabled)
Active: inactive (dead)

3. I started pgagent. At first it looks successful. But after tens of
seconds, it failed to create connection and died.
( While starting CentOs asked me frank's OS password. )
[frank(at)web]$ systemctl start pgagent_96.service
[frank(at)web]$ systemctl status pgagent_96.service
● pgagent_96.service - PgAgent for PostgreSQL 9.6
Loaded: loaded (/usr/lib/systemd/system/pgagent_96.service; disabled;
vendor preset: disabled)
Active: active (running) since 2017-10-16 16:42:11 KST; 5s ago
Process: 9507 ExecStart=/usr/bin/pgagent_96 -s ${LOGFILE}
hostaddr=${DBHOST} dbname=${DBNAME} user=${DBUSER} port=${DBPORT}
(code=exited, status=0/SUCCESS)
Main PID: 9510 (pgagent_96)
CGroup: /system.slice/pgagent_96.service
└─9510 /usr/bin/pgagent_96 -s /var/log/pgagent_96.log
hostaddr=127.0.0.1 dbname=postgres user=postgres port=5432

16 Oct 16:42:11 web.frank.net systemd[1]: Starting PgAgent for PostgreSQL
9.6...
16 Oct 16:42:11 web.frank.net systemd[1]: Started PgAgent for PostgreSQL
9.6.

(After tens of seconds... )

[frank(at)web]$ systemctl status pgagent_96.service
● pgagent_96.service - PgAgent for PostgreSQL 9.6
Loaded: loaded (/usr/lib/systemd/system/pgagent_96.service; disabled;
vendor preset: disabled)
Active: failed (Result: exit-code) since 2017-10-16 16:42:56 KST; 4min
9s ago
Process: 9507 ExecStart=/usr/bin/pgagent_96 -s ${LOGFILE}
hostaddr=${DBHOST} dbname=${DBNAME} user=${DBUSER} port=${DBPORT}
(code=exited, status=0/SUCCESS)
Main PID: 9510 (code=exited, status=1/FAILURE)

16 Oct 16:42:11 web.frank.net systemd[1]: Starting PgAgent for PostgreSQL
9.6...
16 Oct 16:42:11 web.frank.net systemd[1]: Started PgAgent for PostgreSQL
9.6.
16 Oct 16:42:56 web.frank.net systemd[1]: pgagent_96.service: main process
exited, code=exited, status=1/FAILURE
16 Oct 16:42:56 web.frank.net systemd[1]: Unit pgagent_96.service entered
failed state.
16 Oct 16:42:56 web.frank.net systemd[1]: pgagent_96.service failed.

4. I checked pgagent log.
( Log in /var/log/pgagent_96.log )
WARNING: Couldn't create the primary connection (attempt 1): fe_sendauth:
no password supplied
WARNING: Couldn't create the primary connection (attempt 2): fe_sendauth:
no password supplied
WARNING: Couldn't create the primary connection (attempt 3): fe_sendauth:
no password supplied
WARNING: Couldn't create the primary connection (attempt 4): fe_sendauth:
no password supplied
WARNING: Couldn't create the primary connection (attempt 5): fe_sendauth:
no password supplied
WARNING: Couldn't create the primary connection (attempt 6): fe_sendauth:
no password supplied
WARNING: Couldn't create the primary connection (attempt 7): fe_sendauth:
no password supplied
WARNING: Couldn't create the primary connection (attempt 8): fe_sendauth:
no password supplied
WARNING: Couldn't create the primary connection (attempt 9): fe_sendauth:
no password supplied
WARNING: Couldn't create the primary connection (attempt 10): fe_sendauth:
no password supplied
ERROR: Stopping pgAgent: Couldn't establish the primary connection with the
database server.

5. Checked my .pgpass file. ( .pgpass is in frank's home directory.
/home/frank )
[frank(at)web]$ ls -alZ .pgpass
-rw-------. frank frank unconfined_u:object_r:user_home_t:s0 .pgpass
[frank(at)web]$ ls -al .pgpass
-rw-------. 1 frank frank 43 16 Oct 16:23 .pgpass
[frank(at)web]$ id -Z
unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
[frank(at)web]$ id
uid=1000(frank) gid=1000(frank) groups=1000(frank),10(wheel)
context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023

6. Checked my pg_hba.conf.
[frank(at)web]$ su - postgres
-bash-4.2$ pwd
/var/lib/pgsql/9.6/data
-bash-4.2$ ls -alZ pg_hba.conf
-rw-------. postgres postgres unconfined_u:object_r:postgresql_db_t:s0
pg_hba.conf( pg_hba.conf )

( pg_hba.conf )
# TYPE DATABASE USER ADDRESS METHOD
# "local" is for Unix domain socket connections only
#local all all peer
local all all md5

# IPv4 local connections:
#host all all 127.0.0.1/32 ident
host all all 122.32.2.21/32 md5
(122.32.2.21 is my server's IP )

# IPv6 local connections:
#host all all ::1/128 ident
host all all ::1/128 md5

# Allow replication connections from localhost, by a user with the
# replication privilege.
#local replication postgres peer
#host replication postgres 127.0.0.1/32 ident
#host replication postgres ::1/128 ident

7. I changed postgres user's password like this.
postgres=# ALTER USER postgres WITH PASSWORD 'pwd';

These are all I did. I can't guess what I should do. Help me please...