openGauss每日一练第19天|用户和角色管理

1、创建test10_tbs的表空间，在这个表空间中创建数据库testdb10

omm=# create tablespace test10_tbs relative location 'tablespace/test10_tbs';
omm=# create database testdb10 with tablespace=test10_tbs;

2、使用create user创建用户user10，登录数据库testdb10，创建测试表t1和t2

omm=# create user user10 identified by 'kunpeng@1234';
omm=# grant all on database testdb10 to user10;
omm=# alter user user10 sysadmin;
omm=# \l
List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges
-----------+-------+----------+---------+-------+-------------------
omm | omm | UTF8 | C | C |
postgres | omm | UTF8 | C | C |
template0 | omm | UTF8 | C | C | =c/omm +
(5 rows)

omm=# | | | | | omm=CTc/omm
template1 | omm | UTF8 | C | C | =c/omm +
| | | | | omm=CTc/omm
testdb10 | omm | UTF8 | C | C | =Tc/omm +
| | | | | omm=CTc/omm +
| | | | | user10=CTc/omm +
| | | | | user10=APm/omm

omm=# \du
List of roles
Role name | Attributes
| Member of
-----------+--------------------------------------------------------------------------------
----------------------------------+-----------
gaussdb | Sysadmin
| {}
omm | Sysadmin, Create role, Create DB, Replication, Administer audit, Monitoradmin,
Operatoradmin, Policyadmin, UseFT | {}
user10 | Sysadmin
| {}

omm=# \q
omm@modb:~$ gsql -d testdb10 -U user10 -W kunpeng@1234 -r
testdb10=> create table t1(col int);
testdb10=> create table t2(col int);
testdb10=> \q

3、使用create role创建角色role10，登录数据库testdb10

omm=# create role role10 identified by 'kunpeng@1234';
omm=# grant all on database testdb10 to role10;
omm=# \du
-----------+--------------------------------------------------------------------------------
List of roles
Role name | Attributes | Member of
----------------------------------+-----------
gaussdb | Sysadmin | {}
omm | Sysadmin, Create role, Create DB, Replication, Administer audit, Monitoradmin, Operatoradmin, Policyadmin, UseFT | {}
role10 | Cannot login | {}
user10 | Sysadmin | {}

omm=# \q
--使用用户role10尝试登录到数据库testdb10：
omm@modb:~$ gsql -d testdb10 -U role10 -W kunpeng@1234 -r
gsql: FATAL: role "role10" is not permitted to login
原因：
由于数据库用户role10是使用create role语句创建的，目前还不被允许登录到openGauss数据库管理系统。

授予用户user2登录权限后，可以登录数据库
omm@modb:~$ gsql -r
omm=# alter user role10 login;
omm=# \du
List of roles
Role name | Attributes | Member of
-----------+------------------------------------------------------------------------------------------------------------------+-----------
gaussdb | Sysadmin | {}
omm | Sysadmin, Create role, Create DB, Replication, Administer audit, Monitoradmin, Operatoradmin, Policyadmin, UseFT | {}
role10 | | {}
user10 | Sysadmin | {}

omm=# \q

--现在我们已经授予了role10用户登录数据库的权限，可以正常登录数据库testdb10：
gsql -d testdb10 -U role10 -W kunpeng@1234 -r
\q

4、将表t1直接删除，将前面创建的表空间和数据库、表t2转给role10，删除用户user10

omm=# \c testdb10 user10
testdb10=> drop table t1;

--将表t2转移给用户role10：
testdb10=> reassign owned by user10 to role10;
testdb10=> \dt
List of relations
Schema | Name | Type | Owner | Storage
--------+------+-------+--------+----------------------------------
public | t2 | table | role10 | {orientation=row,compression=no}
(1 row)

testdb10=> \q

omm@modb:~$ gsql -r
omm=# drop user user10;
ERROR: role "user10" cannot be dropped because some objects depend on it
DETAIL: privileges for database testdb10

--回收用户user10对testdb10数据库的权限：
omm=# revoke all on database testdb10 from user10;
REVOKE
omm=# drop user user10;
DROP ROLE

5、最后删除role10

omm=# \c testdb10 role10;
testdb10=> \d
List of relations
Schema | Name | Type | Owner | Storage
--------+------+-------+--------+----------------------------------
public | t2 | table | role10 | {orientation=row,compression=no}
(1 row)

testdb10=> drop table t2;
testdb10=> \q

omm@modb:~$ gsql -r
omm=# revoke all on database testdb10 from role10;

omm=# drop user role10;
DROP ROLE

omm=# \du
List of roles
Role name | Attributes
| Member of
-----------+------------------------------------------------------------------------------------------------------------------+-----------
gaussdb | Sysadmin | {}
omm | Sysadmin, Create role, Create DB, Replication, Administer audit, Monitoradmin,
Operatoradmin, Policyadmin, UseFT | {}