Point in Time recovery on PostgreSQL (10.3.1)

Hi All,

We need some help with the point in recovery test . We have followed the
below steps but after creating recovery.conf file and restarting the
machine our DB is getting corrupted and not getting started.
Please look at the below steps and help us analyze what is going wrong
there. We have used offline postgresql installer to set up database.
Required configuration like *wal_level=hot_stanby, archive_mode=on, and
archive_command='cp %p /mnt/server/archive/%f*' in *postgresql.conf* are
also set properly.

1. After DB set up, We have created a tablcespace, db and mapped db with
the tablespace. Also created some tables to generate transaction files in
pg_wal and archive directory (which is *mnt/server/archive*)

2. SELECT pg_start_backup('TestPITR');

3. Taken backup(tar) of Postgresql data directory (opt/PostgreSQL/10/
data)>>tar
zcf backup20180810.tar data/

4. SELECT pg_stop_backup();

5. Created some more tables and noted down their timestamp (for PITR, which
will be added in recovery.conf file as *recovery_target_time* )

6. Stopped the DB>>service postgresql-10 stop

7. Created a new directory >>mkdir pgbackup

8. Moved tar file into the pgbackup directory >>mv backup20180810.tar
/opt/PostgreSQL/10/pgbackup

9. Copied archive files into the pgbackup directory>> cp -r /
*mnt/server/archive*/ /opt/PostgreSQL/10/pgbackup/

10. Renamed the old data directory( opt/PostgreSQL/10/ data )to bad.data
>>> mv data bad.data (now opt/PostgreSQL/10/ bad.data)

11. untar the back taken in step 2>>tar -xvf backup20180810.tar

12. Moved the data directory to old path >>>mv
/opt/PostgreSQL/10/pgbackup/data/ /opt/PostgreSQL/10/ (Now i have
opt/PostgreSQL/10/ data-derived from tar file and with old transaction logs
in pg_wal)

13 Copied the updated pg_wal logs from bad.data to data >>>cp -r
/opt/PostgreSQL/10/bad.data/pg_wal/0* /opt/PostgreSQL/10/data/pg_wal

14. Started the database >> service postgresql-10 start (Our db works fine)

15. Created a recovery.conf file inside data folder >>opt/PostgreSQL/10/ data
--given the permission and user as postgres

Our recovery.conf file has two following parameters. *recovery_target_time
was taken from step-5*

*restore_command = 'cp /opt/PostgreSQL/10/pgbackup/archive/%f
%p'recovery_target_time = '2018-08-10 02:56:31'*

16. Restarted the db server>> service postgresql-10 restart

It doesn't restart instead we are getting below error(yesterday's log) on
linux host. Also there is no log entry in log
folder(opt/PostgreSQL/10/data/log) looks like it has stopped creating logs
after restart.

* journalctl -xeAug 09 06:47:53 scspr0512196001 systemd[1]: Starting
PostgreSQL 10 database s-- Subject: Unit postgresql-10.service has begun
start-up-- Defined-By: systemd--
Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
<https://www.google.com/url?q=http://lists.freedesktop.org/mailman/listinfo/systemd-devel&sa=D&source=hangouts&ust=1533964684221000&usg=AFQjCNFJDTSITdO_SpA_w3Y8ZNn7zwrDqQ>----
Unit postgresql-10.service has begun starting up.Aug 09 06:47:53
scspr0512196001 pg_ctl[17697]: waiting for server to start...Aug 09
06:47:53 scspr0512196001 pg_ctl[17697]: pg_ctl: could not start serverAug
09 06:47:53 scspr0512196001 pg_ctl[17697]: Examine the log output.Aug 09
06:47:53 scspr0512196001 systemd[1]: postgresql-10.service: control prAug
09 06:47:53 scspr0512196001 systemd[1]: Failed to start PostgreSQL 10 dat--
Subject: Unit postgresql-10.service has failed-- Defined-By: systemd--
Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
<https://www.google.com/url?q=http://lists.freedesktop.org/mailman/listinfo/systemd-devel&sa=D&source=hangouts&ust=1533964684221000&usg=AFQjCNFJDTSITdO_SpA_w3Y8ZNn7zwrDqQ>----
Unit postgresql-10.service has failed.---- The result is failed.Aug 09
06:47:53 scspr0512196001 systemd[1]: Unit postgresql-10.service entereAug
09 06:47:53 scspr0512196001 systemd[1]: postgresql-10.service failed.Aug 09
06:47:53 scspr0512196001 polkitd[740]: Unregistered Authentication Age *