Odoo Internal Server Error while installing on amazon web server EC2 - odoo-8

Question

I am installing odoo8 on amazon EC2 web server . I installed ubuntu 14.04 on it and after that Odoo8 where executing all the steps it gives Internal Server Error for the Database Connection.
The error is,
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/werkzeug/serving.py", line 177, in run_wsgi
execute(self.server.app)
File "/usr/lib/python2.7/dist-packages/werkzeug/serving.py", line 165, in execute
application_iter = app(environ, start_response)
File "/home/ubuntu/odoo/openerp/service/server.py", line 290, in app
return self.app(e, s)
File "/home/ubuntu/odoo/openerp/service/wsgi_server.py", line 216, in application
return application_unproxied(environ, start_response)
File "/home/ubuntu/odoo/openerp/service/wsgi_server.py", line 202, in application_unproxied
result = handler(environ, start_response)
File "/home/ubuntu/odoo/openerp/http.py", line 1290, in __call__
return self.dispatch(environ, start_response)
File "/home/ubuntu/odoo/openerp/http.py", line 1264, in __call__
return self.app(environ, start_wrapped)
File "/usr/lib/python2.7/dist-packages/werkzeug/wsgi.py", line 579, in __call__
return self.app(environ, start_response)
File "/home/ubuntu/odoo/openerp/http.py", line 1406, in dispatch
self.setup_db(httprequest)
File "/home/ubuntu/odoo/openerp/http.py", line 1348, in setup_db
httprequest.session.db = db_monodb(httprequest)
File "/home/ubuntu/odoo/openerp/http.py", line 1478, in db_monodb
dbs = db_list(True, httprequest)
File "/home/ubuntu/odoo/openerp/http.py", line 1452, in db_list
dbs = dispatch_rpc("db", "list", [force])
File "/home/ubuntu/odoo/openerp/http.py", line 115, in dispatch_rpc
result = dispatch(method, params)
File "/home/ubuntu/odoo/openerp/service/db.py", line 73, in dispatch
return fn(*params)
File "/home/ubuntu/odoo/openerp/service/db.py", line 313, in exp_list
with closing(db.cursor()) as cr:
File "/home/ubuntu/odoo/openerp/sql_db.py", line 575, in cursor
return Cursor(self.__pool, self.dbname, self.dsn, serialized=serialized)
File "/home/ubuntu/odoo/openerp/sql_db.py", line 181, in __init__
self._cnx = pool.borrow(dsn)
File "/home/ubuntu/odoo/openerp/sql_db.py", line 464, in _locked
return fun(self, *args, **kwargs)
File "/home/ubuntu/odoo/openerp/sql_db.py", line 526, in borrow
result = psycopg2.connect(dsn=dsn, connection_factory=PsycoConnection)
File "/usr/lib/python2.7/dist-packages/psycopg2/__init__.py", line 179, in connect
connection_factory=connection_factory, async=async)
OperationalError: FATAL: role "ubuntu" does not exist
2015-07-01 11:41:16,580 1315 ERROR None openerp.sql_db: Connection to the database failed

Answer 1

I think the problem is the postgres user. Check the db_user in the /etc/openerp-server.conf file. Its looks like the user is ubuntu which is not a postgres user. You need to create the user ubuntu in postgres or change the user in the config file to an existing postgres user.

Answer 2

The problem is user name ubuntu is not exists in your postgres database,
Let's move to solution:
First, You need to create use that has name ubuntu in your postgres using below command
CREATE USER ubuntu WITH PASSWORD 'ubuntu';
Then you need to give privilege to ubuntu user like this
ALTER USER ubuntu CREATEUSER CREATEDB;