Shulou(Shulou.com)06/01 Report--

In this issue, the editor will bring you about the implementation of locking virtual console sessions in Linux. The article is rich in content and analyzes and describes for you from a professional point of view. I hope you can get something after reading this article.

Install Vlock

On Arch-based systems, the Vlock package is replaced with the default preinstalled kpd package, so you don't have to worry about installation.

On Debian, Ubuntu, Linux Mint, run the following command to install Vlock:

$sudo apt-get install vlock

On Fedora:

$sudo dnf install vlock

On RHEL, CentOS:

$sudo yum install vlock

Lock a virtual console session on Linux

The general syntax of Vlock is:

Vlock [- acnshv] [- t] [plugins... ]

Here:

A-Lock all virtual console sessions

C-Lock the current virtual console session

N-switch to the new empty console before locking all sessions

S-disable the SysRq key mechanism

T-specify the timeout of the screensaver plug-in

H-Show help

V-displays the version.

Let me give you a few examples.

1. Lock the current console session

When Vlock is run without any parameters, it locks the current console session (TYY) by default. To unlock the session, you need to enter the current user's password or root password.

$vlock

You can also use the-c flag to lock the current console session.

$vlock-c

Note that this command locks only the current console. You can press ALT+F2 to switch to another console. For more details on switching between TTY, see the following guidelines.

In addition, if the system has multiple users, other users can still access their respective TTY.

2. Lock all console sessions

To lock all TTY at the same time and disable the virtual console switching feature, run:

$vlock-a

Similarly, to unlock the console session, simply press enter and enter the current user's password or root password.

Keep in mind that root users can unlock any vlock session at any time unless disabled at compile time.

3. Switch to the new virtual console before locking all consoles

You can also switch Vlock from an X session to a new virtual console before locking all consoles. To do this, use the-n flag.

$vlock-n

4. Disable SysRq mechanism

As you may know, the magic SysRq key mechanism allows users to perform certain actions when the system crashes. Therefore, users can use SysRq to unlock the console. To prevent this, pass the-s option to disable the SysRq mechanism. Keep in mind that this option only applies when you have the-an option.

$vlock-sa

For more options and their usage, see the help or man pages.

$vlock-h

$man vlock

The above is the implementation of locking the virtual console session in Linux shared by the editor. If you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.