Postgresql in Docker: role root does not exist解决办法

[root@~]#su - postgres
Last login: Wed Apr  1 10:28:10 CST 2015 on pts/2
-bash-4.2$ psql -U postgres
psql (9.4.0)
Type "help" for help.

postgres=#create user root with password 'password';
CREATE ROLE
postgres=# GRANT ALL PRIVILEGES ON DATABASE mydatabase to root;
GRANT
postgres=# ALTER ROLE root WITH SUPERUSER;

postgres=# \q

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