前言
Linux的图形界面实在是太耗资源了，同时开几个虚拟机感觉已经hold不住了，赶紧把这些Linux服务器的图形界面都关掉。
CLI：command Line Interface，命令行界面。
现在的Linux发行版默认登陆界面几乎都是默认为GUI界面，如果按照旧版本的修改inittab文件，在一些比较新的版本是没有这个文件的(Linux的启动服务机制发生改变)
修改Grub配置文件
打开grup配置文件
nano /etc/default/grub
修改
GRUB_CMDLINE_LINUX=”” 为GRUB_CMDLINE_LINUX=”text”
更新grub
update-grub
更新系统服务管理器配置
systemctl set-default multi-user.target
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:
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 use only modes which your graphic card supports via 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”
解除debian root用户登陆限制
打开gdm配置文件：
nano /etc/gdm3/deamon.conf
配置安全设置：
[security] 下一行添加 AllowRoot = ture
去除gdm登陆用户名检测：
打开文件 /etc/pam.d/gdm-autologin，并其相关配置信息删除或注释掉：auth required pam_succeed_if.so user != root quiet_success
修改后的gdm-autologin文件：
%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 needs to be the first session rule. This ensures that any
lingering context has been cleared. Without this it is possible
that a module could 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
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
About
作者：画星星高手
链接：https://www.jianshu.com/p/d8e23105e14d
来源：简书
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