Postgresql error

Postgresql-Arch-Error

(root)# systemctl start postgresql
Job for postgresql.service failed because the control process exited with error code.
See "systemctl status postgresql.service" and "journalctl -xe" for details

(root)# systemctl status postgresql
● postgresql.service - PostgreSQL database server
   Loaded: loaded (/usr/lib/systemd/system/postgresql.service; disabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Mon 2017-03-06 07:52:38 UTC; 12s ago
  Process: 10052 ExecStartPre=/usr/bin/postgresql-check-db-dir ${PGROOT}/data (code=exited, status=1/FAILURE)
      CPU: 6ms

Mar 06 07:52:38 <YourHostName> systemd[1]: Starting PostgreSQL database server...
Mar 06 07:52:38 <YourHostName> systemd[1]: postgresql.service: Control process exited, code=exited status=1
Mar 06 07:52:38 <YourHostName> systemd[1]: Failed to start PostgreSQL database server.
Mar 06 07:52:38 <YourHostName> systemd[1]: postgresql.service: Unit entered failed state.
Mar 06 07:52:38 <YourHostName> systemd[1]: postgresql.service: Failed with result 'exit-code'.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Solution(https://bbs.archlinux.org/viewtopic.php?id=151593)
(root)# chown -R postgres:postgres /var/lib/postgres/
(root)# su - postgres -c "initdb --locale en_US.UTF-8 -D '/var/lib/postgres/data'"
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 locale "en_US.UTF-8".
The default database encoding has accordingly been set to "UTF8".
The default text search configuration will be set to "english".

Data page checksums are disabled.

fixing permissions on existing directory /var/lib/postgres/data ... ok
creating subdirectories ... ok
selecting default max_connections ... 100
selecting default shared_buffers ... 128MB
selecting dynamic shared memory implementation ... posix
creating configuration files ... ok
running bootstrap script ... ok
performing post-bootstrap initialization ... ok
syncing data to disk ... ok

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:

    pg_ctl -D /var/lib/postgres/data -l logfile start

(root)# systemctl status postgresql
● postgresql.service - PostgreSQL database server
   Loaded: loaded (/usr/lib/systemd/system/postgresql.service; disabled; vendor preset: disabled)
   Active: active (running) since Mon 2017-03-06 07:56:19 UTC; 1s ago
  Process: 10168 ExecStart=/usr/bin/pg_ctl -s -D ${PGROOT}/data start -w -t 120 (code=exited, status=0/SUCCESS)
  Process: 10150 ExecStartPre=/usr/bin/postgresql-check-db-dir ${PGROOT}/data (code=exited, status=0/SUCCESS)
 Main PID: 10172 (postgres)
    Tasks: 6 (limit: 4915)
   Memory: 15.0M
      CPU: 37ms
   CGroup: /system.slice/postgresql.service
           ├─10172 /usr/bin/postgres -D /var/lib/postgres/data
           ├─10181 postgres: checkpointer process   
           ├─10182 postgres: writer process   
           ├─10183 postgres: wal writer process   
           ├─10184 postgres: autovacuum launcher process   
           └─10185 postgres: stats collector process   

Mar 06 07:56:17 father systemd[1]: Starting PostgreSQL database server...
Mar 06 07:56:18 father postgres[10168]: LOG:  database system was shut down at 2017-03-06 07:56:08 UTC
Mar 06 07:56:18 father postgres[10168]: LOG:  MultiXact member wraparound protections are now enabled
Mar 06 07:56:18 father postgres[10168]: LOG:  database system is ready to accept connections
Mar 06 07:56:18 father postgres[10168]: LOG:  autovacuum launcher started
Mar 06 07:56:19 father systemd[1]: Started PostgreSQL database server.

Depending on the version , initialization would be (my version was 9.6)

su - postgres -c "initdb --locale en_US.UTF-8 -D '/var/lib/pgsql/data/'"