Shantanu's Blog

Corporate Consultant

May 12, 2011

 

Users without super privileges

It is recommended to have 2 types of users.

1) A user with all the privileges including with grant option. This user is equivalent to root.
grant all on *.* to 'foo'@'%' identified by 'bar' with grant option;

2) Another set of users is the ones who have all the privileges except "super".
revoke super on *.* from 'foo'@'%';

There are 3 advantages of having users without "super" access.
1) More secure
2) Read only slave
3) Logging

a) The first point does not need explanation.
b) When I start a slave in "read-only" mode, all the users without super privileges can only read the data and can not write.
c) When the server is not started in "read-only" mode, we can log the users source access points in a mysql table.

SET GLOBAL init_connect='create table if not exists test.connect(db_name varchar(100), user_with_ip varchar(100), user_permission varchar(100),
thread_id varchar(100), connect_time datetime) engine=MyISAM; insert into test.connect select @@hostname as db_name, user() as user_with_ip,
current_user() as user_permission, connection_id() as connect_id, now() as connect_time';

This will help to analyse how many times a particular credential was used. The thread_id can also be linked to binary log extract to know the commands executed by a user in that thread.

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