set_up_read_only_user.txt

1) Create a linux user and set password
  sudo adduser read_access
  
  .. then enter your password for this user

2) Limit permission for the user (option)
  .. normally, this user only has root permission on it's directory. (/home/read_access)

3) Set read-only role for this user to use Postgresql
 
  psql -U postgres -d <your database>
  
  CREATE USER read_access WITH PASSWORD '<your password>';
  
  GRANT CONNECT ON DATABASE <your database> TO read_access;
  
  GRANT SELECT ON ALL TABLES IN SCHEMA public TO read_access;
  
  GRANT SELECT ON ALL SEQUENCES IN SCHEMA public TO read_access;
  
  ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT ON TABLES TO read_access;
  
  ALTER USER read_access SET default_transaction_read_only = on;
  
  <br/>
4) Dump your database
   PGPASSWORD="<your password>" pg_dump -Fc --no-acl --no-owner -h localhost -U read_access -d <your database> -t <your table> > mydb.dump
   
5) If you try to "change you will get this error"
ERROR:  cannot execute INSERT in a read-only transaction