Preface

The Linux graphical interface is incredibly resource-intensive; running several virtual machines simultaneously feels overwhelming. Time to disable the graphical interface on all these Linux servers.

CLI: Command Line Interface.
Modern Linux distributions default almost entirely to a GUI login interface. Following older methods to modify the inittab file won’t work on newer versions, as the Linux boot service mechanism has changed.

Modifying the GRUB Configuration File

Open the GRUB configuration file (Grub配置文件)

nano /etc/default/grub 

Modify the following line

GRUB_CMDLINE_LINUX=”” to GRUB_CMDLINE_LINUX=”text” 

Update GRUB (更新grub)

update-grub 

Update the system service manager configuration (更新系统服务管理器配置)

systemctl set-default multi-user.target 

Reboot (重启): init 6

If you change this file, run 'update-grub' afterwards to update.

/boot/grub/grub.cfg.

For full documentation of the options in this file, see: https://github.com/typescript-eslint/typescript-eslint/blob/main/docs/linting/configs.md

info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR=lsb_release -i -s 2> /dev/null || echo Debian
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
GRUB_CMDLINE_LINUX="text"

Uncomment to enable BadRAM filtering, modify to suit your needs

This works with Linux (no patch required) and with any kernel that obtains

The memory map information from GRUB (GNU Mach, kernel of FreeBSD …)

#GRUB_BADRAM=”0x01234567,0xfefefefe,0x89abcdef,0xefefefef”

Uncomment to disable graphical terminal (grub-pc only)

#GRUB_TERMINAL=console

The resolution used on graphical terminal

Note that you can only use modes supported by your graphics card through VBE.

you can see them in real GRUB with the command `vbeinfo’

#GRUB_GFXMODE=640x480

Uncomment if you don't want GRUB to pass “root=UUID=xxx” parameter to Linux

#GRUB_DISABLE_LINUX_UUID=true

Uncomment to disable generation of recovery mode menu entries

#GRUB_DISABLE_RECOVERY="true"

Uncomment to get a beep at grub start

#GRUB_INIT_TUNE="480 440 1"

## Removing Debian Root User Login Restriction

Open the gdm configuration file:

```py
nano /etc/gdm3/deamon.conf 

Configure security settings: Add AllowRoot = ture on the next line under [security] Remove gdm login username check: Open the file /etc/pam.d/gdm-autologin and delete or comment out its related configuration information: auth required pam_succeed_if.so user != root quiet_success

The modified gdm-autologin file:

#%PAM-1.0 
auth requisite pam_nologin.so 
#auth required pam_succeed_if.so user != root quiet_success 
auth required pam_permit.so 
@include common-account 

SELinux must be the first session rule. This ensures that any

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The module may execute code in the wrong domain.

session [success=ok ignore=ignore module_unknown=ignore default=bad] pam_selinux.so close
session required pam_loginuid.so

SELinux needs to intervene at login time to ensure that the process

starts in the proper default security context. Only sessions which are

Those intended to run in the user’s context should be run after this.

session [success=ok ignore=ignore module_unknown=ignore default=bad] pam_selinux.so open
session optional pam_keyinit.so force revoke
session required pam_limits.so
session required pam_env.so readenv=1
session required pam_env.so readenv=1 envfile=/etc/default/locale
@include common-session
@include common-password