Implement directory and file permissions and ownership management strategies for Linux file servers

1. Experimental purposes and requirements

On the Linux file server, how to set directory and file permissions and ownership to ensure that files are not viewed by relevant personnel. Linux commands, write specific implementation plans and configuration commands as needed.

Master the Linux file permission management with the help of commands such as chmod and chgrp.

Understand how to implement the C disk limit.

2. Experimental instruments and equipment

NotebookExperiment name: linux user management, CentOS operating system under virtual machine

3. Experimental content

(1) Experimental knowledge points

1. When creating a file, the system will manually grant the file owner read and write permissions Experiment name: linux user management , which allows the owner to display the file content and change the file .

2 On the Linux file server, how to set directory and file permissions and attribute them to the linux makefile to ensure that the files are not viewed by unrelated persons.

(2) Experimental principles

The system will manually set permissions when building the file. If the default permissions do not meet the needs, you can use the chmod command to change the permissions. Generally, two methods can be used to represent the permission type when permissions are changed: numerical representation and text representation.

Create a directory command in the host directory: mkdir/urs/test

Permission management command: chomd[{ugoa}{±=}{rws}][file or directory][mode=421][file or directory]

4. Experimental implementation steps

1.Set file permissions

(1) Create the directory test in the home directory of user user1, enter the test directory and create an empty file file1. And display the file information in a long format, pay attention to the permissions of the file and the users and groups to which it belongs.

(2) Set permissions on file file1 so that other users can write to this file. and view the setting results.

(3) Cancel the read permission of users in the same group on this file. View the setting results.

(4) Use numerical methods to set permissions for file file1. The owner can read, write, and execute; other users and users of the group they belong to only have read and execute permissions. After the setting is completed, check the setting results.

(5) Modify the permissions of file file1 numerically so that the owner can only read this file, and no other users have permissions. View the setting results.

(6) Add write permissions for other users. View the setting results.

(7) Return to the lower directory and check the permissions of test.

(8) Add write permissions to this directory for other users.

2. Change the owner of a file

(1) Check the directory test and the users and groups to which the files in it belong.

(2) Change the owner of the directory test and all files under it to bin, and change the group to daemon. View the setting results.

(3) Delete the directory test and the files under it.

5. Experiment summary:

Add execution permissions to the owner of the file test: chmodu xtest

Give all users permission to read and write test files: chmoda rwtest

No one can change the file except the user owner: filechmod755file

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