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postgreSQL Upgradation combination server

combination of these two resources:
and
The second one helped more then the first one. Also to not, don't follow the steps as is as some are not necessary. Also, if you are not being able to backup the data via postgres console, you can use alternative approach, and backup it with pgAdmin 3 or some other program, like I did in my case.
Also, the link: https://help.ubuntu.com/stable/serverguide/postgresql.html Helped to set the encrypted password and set md5 for authenticating the postgres user.
After all is done, to check the postgres server version run in terminal:
sudo -u postgres psql postgres
After entering the password run in postgres terminal:
SHOW SERVER_VERSION;
It will output something like:
 server_version 
----------------
 9.4.5
For setting and starting postgres I have used command:
> sudo bash # root
> su postgres # postgres

> /etc/init.d/postgresql start
> /etc/init.d/postgresql stop
And then for restoring database from a file:
> psql -f /home/ubuntu_username/Backup_93.sql postgres
Or if doesn't work try with this one:
> pg_restore --verbose --clean --no-acl --no-owner -h localhost -U postgres -d name_of_database ~/your_file.dump
And if you are using Rails do a bundle exec rake db:migrate after pulling the code :)

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