Using chatr to create a file that can not be deleted by root under Linux

Philosophy of life 2020-11-10 16:01:03
using chatr create file deleted


One . About chattr,lsattr

1.chattr The role of : Change one Linux File properties on the file system .

2.chattr Used to change files 、 Properties of the directory ,lsattr To view files 、 Properties of the directory .

3.chattr The grammar is :chattr [ -RVf ] [ -v version ] [ mode ] files…, The most important thing is [mode] part ,[mode] Partly by +-= and [ASacDdIijsTtu] These words

The combination of symbols , This part is used to control the properties of the file . The common parameters are as follows :

+ : Based on the original parameter setting , Additional parameters .
- : Based on the original parameter setting , Remove parameters .
= : Update to specified parameter settings .
A: namely Atime, Tell the system not to change the last access time to this file .
S: namely Sync, Once the application writes to the file , Make the system write the modified results to disk immediately .
a: namely Append Only, The system only allows appending data after this file , No process is allowed to overwrite or truncate this file . If the directory has this property , The system will only allow files to be created and modified in this directory , It's not allowed to delete any files .
b: Do not update the last access time of a file or directory .
c: Compress a file or directory and store it .
d: When dump When the program is executed , The file or directory will not be dump Backup .
D: Check for errors in compressed files .
i: namely Immutable, The system does not allow any changes to this file . If the directory has this property , Then any process can only modify the files under the directory , Creating and deleting files... Is not allowed .
s: Delete files completely , Irrecoverable , Because it was removed from the disk , And then use 0 Fill in the file area .
u: When an application requests to delete this file , The system will keep its data block so that it can recover and delete this file later , Used to prevent accidental deletion of files or directories .
t: The file system supports tail merging (tail-merging).
X: You can directly access the contents of the compressed file .

Two . Create a company root Can't be deleted

[root@node5 ~]# ll linuxshell.sh
-rw-r--r-- 1 root root 181 Oct 12 11:57 linuxshell.sh
[root@node5 ~]# chattr +i linuxshell.sh
[root@node5 ~]# ll linuxshell.sh
-rw-r--r-- 1 root root 181 Oct 12 11:57 linuxshell.sh
[root@node5 ~]# rm -rf linuxshell.sh
rm: cannot remove ‘linuxshell.sh’: Operation not permitted
[root@node5 ~]# lsattr linuxshell.sh
----i----------- linuxshell.sh
[root@node5 ~]# chattr -i linuxshell.sh
[root@node5 ~]# lsattr linuxshell.sh
---------------- linuxshell.sh
[root@node5 ~]# rm -rf linuxshell.sh
[root@node5 ~]# chattr +a lll.sh
[root@node5 ~]# lsattr lll.sh
-----a---------- lll.sh
[root@node5 ~]# echo aaa >> lll.sh
[root@node5 ~]# rm -rf lll.sh
rm: cannot remove ‘lll.sh’: Operation not permitted
[root@node5 ~]# chattr -a lll.sh
[root@node5 ~]# lsattr lll.sh
---------------- lll.sh
[root@node5 ~]# rm -rf lll.sh

Reference link :http://www.ha97.com/5172.html

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