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Linux 权限管理进阶:sudo 实战技巧详解

  • 2026-03-12 01:54:15
Linux 权限管理进阶:sudo 实战技巧详解

今天分享一下sudo权限管理

1 什么是 sudo

sudo(superuser do)允许普通用户在不切换到 root 账户的前提下,以其他用户(默认是 root)的身份运行命令。相比直接使用 susudo 提供了更细粒度、更安全的权限控制。

2 sudo 的基本命令用法

sudo command# 以 root 权限执行命令sudo -u 命令  # 以指定用户身份执行命令sudo -i                   # 获取一个 root 登录 shellsudo -l                   # 查看当前用户被授权执行的命令列表

3 sudo 权限配置

所有 sudo 的核心配置文件是 /etc/sudoers,但你不应该直接编辑它。推荐使用 visudo 来避免配置错误导致系统无法使用 sudo。

visudo

sudoers 文件的基本语法:

<用户>  <主机>= (<可切换身份>) <命令列表>

例如:

liyb  ALL=(ALL)  NOPASSWD: /usr/vibin/systemctl restart nginx

含义是:用户 liyb 可以在所有主机上,以任意用户身份,无需输入密码,执行 /bin/systemctl restart nginx

4 实战案例

4.1 限制用户只运行特定命令

liyb ALL=(ALL) /usr/bin/systemctl restart nginx

效果:用户 bob 只能使用 sudo 重启 nginx,不能用它来执行其他命令。

4.2 多个用户共享相同权限

Cmnd_Alias RESTART_CMDS = /sbin/reboot, /usr/bin/systemctl restart nginxUser_Alias ADMINS = alice, liybADMINS ALL=(ALL) NOPASSWD: RESTART_CMDS

用户组 ADMINS 成员可以无需密码执行 RESTART_CMDS 里的命令。

4.3 开发人员编辑特定配置文件

dev ALL=(ALL) NOPASSWD: /usr/bin/vi  /etc/nginx/nginx.conf

开发人员只能编辑 nginx 配置文件,而无法访问其他系统文件。

4.4 4将liyb设为root权限

liyb  ALL=(ALL)  ALL

如果设置成这样,代表liyb用户可以执行任何权限,不过需要输入密码才能执行。

还有一种办法就是将liyb用户加入wheel组。

5 sudo 日志与审计

所有通过 sudo 执行的命令都会被记录,方便日后审计和追踪:

  • Ubuntu/Debian 系统:/var/log/auth.log
  • CentOS/RHEL 系统:/var/log/secure

日志信息包含用户名、执行命令、终端信息、是否成功等关键信息:

6 安全建议与最佳实践

  • 最小权限原则:只授权用户执行他们所需的最少命令
  • 避免通配符(如 /bin/*):容易被滥用
  • 谨慎使用 NOPASSWD:虽然方便,但可能成为安全隐患
  • 定期审计授权规则:用户、命令需求可能会变化
如果需要提供技术支持或添加交流群,加V详聊:lige_linux

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安装完操作系统后建议做这些优化工作!

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  1. CONNECT:[ UseTime:0.000488s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000772s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000308s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000319s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000496s ]
  6. SELECT * FROM `set` [ RunTime:0.000196s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000630s ]
  8. SELECT * FROM `article` WHERE `id` = 479404 LIMIT 1 [ RunTime:0.000696s ]
  9. UPDATE `article` SET `lasttime` = 1774600603 WHERE `id` = 479404 [ RunTime:0.004309s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000285s ]
  11. SELECT * FROM `article` WHERE `id` < 479404 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000462s ]
  12. SELECT * FROM `article` WHERE `id` > 479404 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000417s ]
  13. SELECT * FROM `article` WHERE `id` < 479404 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005857s ]
  14. SELECT * FROM `article` WHERE `id` < 479404 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006074s ]
  15. SELECT * FROM `article` WHERE `id` < 479404 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006440s ]
0.173427s