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15分钟学会Linux权限管理体系,新手必学核心知识总结

  • 2026-04-17 08:16:27
15分钟学会Linux权限管理体系,新手必学核心知识总结

一、核心一句话理解

👉 Linux 权限本质 = 谁(用户)对什么(文件)能做什么(操作)


二、三类身份(必须记住)

每个文件都有 3 种身份:

身份
含义
user (u)
文件所有者
group (g)
所属组
other (o)
其他人

三、三种权限(最核心)

权限
含义
数字
r
读(read)
4
w
写(write)
2
x
执行(execute)
1

👉 组合规则:

  • rwx = 7
  • rw- = 6
  • r-x = 5
  • r-- = 4

四、看懂权限(ls -l)

ls-l-rwxr-xr-- 1  root root 1234  test.sh

拆解:

含义
-
文件类型
rwx
owner
r-x
group
r--
other

👉 口诀:第一段 owner,第二段 group,第三段 other


五、修改权限(chmod)

方式1:数字(推荐)

chmod755 test.sh

👉 含义:

  • owner = 7(rwx)
  • group = 5(r-x)
  • other = 5(r-x)

方式2:符号方式

chmod u+x test.shchmod g-w test.shchmodo=r test.sh


六、修改归属(chown / chgrp)

修改用户 + 组

chown user:group file

示例

chown nginx:nginx index.html


七、目录权限(重点区别)

权限
文件
目录
r
读内容
查看文件列表
w
修改内容
新增/删除文件
x
执行
进入目录

👉 重点:目录没有 x = 无法 cd 进去


八、默认权限(umask)

创建文件默认权限:

umask

👉 计算逻辑:

文件默认:666目录默认:777最终权限 = 默认 - umask

例:

umask 022

结果:

  • 文件:644
  • 目录:755

九、高级权限(必须掌握 3 个)

1️⃣ SUID(4)

chmod4755 file

👉 作用:执行文件时,用“文件所有者权限”

典型例子:

passwd


2️⃣ SGID(2)

chmod2755 dir

👉 作用:新文件继承目录组


3️⃣ Sticky Bit(1)

chmod1777 /tmp

👉 作用:只有文件所有者能删除


十、ACL权限(企业必会)

解决问题:👉 “一个文件给多个用户不同权限”

setfacl -m u:user1:rwx filegetfacl file


十一、实战排障思路(SRE必备)

遇到权限问题,按顺序排查:

1️⃣ 看权限

ls-l

2️⃣ 看归属

ls-l

3️⃣ 看目录权限

👉 很多问题卡在目录没有 x


4️⃣ 看 SELinux(高级)

getenforce


5️⃣ 看 ACL

getfacl file


十二、常见错误(面试高频)

❌ 1:文件有权限但不能执行👉 目录没 x

❌ 2:chmod 777 乱用👉 安全风险

❌ 3:root 以为无敌👉 SELinux 可以限制 root


十三、15分钟记忆口诀

👉 一句话记住全体系:

三类人(u g o)三权限(r w x)数字表示(4 2 1)chmod改权限chown改归属目录必须有xumask控默认特殊权限三件套(SUID SGID Sticky)ACL解决复杂权限


十四、进阶(适合你这个阶段)

结合你“SRE + 架构”背景,建议你再往上走:

🔥 企业级能力补充

  • 权限 + SELinux 策略设计
  • 权限 + 容器(K8s SecurityContext)
  • 权限 + NFS / Ceph 共享存储
  • 权限 + 最小权限原则(Zero Trust)

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  1. CONNECT:[ UseTime:0.000393s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000531s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003566s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000290s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000469s ]
  6. SELECT * FROM `set` [ RunTime:0.000908s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000535s ]
  8. SELECT * FROM `article` WHERE `id` = 485218 LIMIT 1 [ RunTime:0.003239s ]
  9. UPDATE `article` SET `lasttime` = 1776411279 WHERE `id` = 485218 [ RunTime:0.008480s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000396s ]
  11. SELECT * FROM `article` WHERE `id` < 485218 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000750s ]
  12. SELECT * FROM `article` WHERE `id` > 485218 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001022s ]
  13. SELECT * FROM `article` WHERE `id` < 485218 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009356s ]
  14. SELECT * FROM `article` WHERE `id` < 485218 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004168s ]
  15. SELECT * FROM `article` WHERE `id` < 485218 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002191s ]
0.118737s