Greeplum 系列（七） 权限管理

一、角色管理

Role 分为用户(User)和组(Group)，用户有 login 权限，组用来管理用户，一般不会有 login 权限。初始化 gp 时创建了一个 SUPERUSER ROLE：gpadmin。

表 1 ：ALTER ROLE 属性

(1) 创建用户

create role lei with login;             # 创建用户
drop owned by lei;                      # 删除用户
reassign owned by oldUser to newUser;   # 将 oldUser 的权限赋予 newUser
alter lei password ‘123456‘;
alter lei valid until ‘infinity‘;       # 永不失效
alter lei deny day ‘Sunday‘;
alter lei resource queue queue1;
alter lei password ‘123456‘;
alter lei set search_path to sc01,public;

(2) 创建组

# 创建组
create role admin createrole createdb;
# 添加或删除组成员
grant admin to lei;
revoke admin from lei;
# 赋予合适的权限给组 admin
grant all on table mytable to admin;
grant all on schema myschema to admin;
grant all on database mydb to admin;
# 获取管理属性
set role admin;

(3) 对象权限管理

表 2 ：对象权限

(4) 基于时间的登录认证

通过 BETWEEN 和 AND 关键字连接两个日期/时间。

BETWEEN DAY ‘Monday‘ AND DAY ‘Tuesday‘
BETWEEN DAY ‘Monday‘ TIME ‘00:00‘ AND DAY ‘Monday‘ TIME ‘01:00‘
BETWEEN DAY ‘Monday‘ TIME ‘12:00 AM‘ AND DAY ‘Tuesday‘ TIME ‘02:00 AM‘
BETWEEN DAY ‘Monday‘ TIME ‘00:00‘ AND DAY ‘Tuesday‘ TIME ‘02:00‘
BETWEEN DAY 1 TIME ‘00:00‘ AND DAY 2 TIME ‘02:00‘

注意：日期间隔不能跨 Saturday(周六)

Incorrect: DENY BETWEEN DAY ‘Saturday‘ AND DAY ‘Sunday‘

删除时间约束，原则：有交集即移出

ALTER ROLE dylan DROP DENY FOR DAY ‘Monday’;

(5) 配置客户端认证

修改 $MASTER_DATA_DIRECTORY/pg_hba.conf

# local(本地)/host(远程) dbname role authmethod
local    all         gpadmin         ident
host     all         gpadmin         127.0.0.1/28    trust
host     all         gpadmin         192.168.2.110/32       trust
host     all         gpadmin         ::1/128       trust
host     all         gpadmin         fe80::250:56ff:fe2a:552a/128       trust
local    replication gpadmin         ident
host     replication gpadmin         samenet       trust
local    all         lei         trust

重新加载 pg_hba.conf 使修改生效

gpstop –u

二、配置客户端($MASTER_DATA_DIRECTORY/postgresql.conf)

postgresql.conf 是 Greenplum 中一个重要的配制文件，下面介绍几个重要的配制项。

# 限制并发操作的连接的两个配制
max_connections = 250           # 最大连接数，Segment 最少是 Master 的 3 倍
max_prepared_transactions = 250 # 最大事务

原文地址：https://www.cnblogs.com/binarylei/p/9113873.html