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Debian Linux系统图形界面相当的消耗硬件资源，比如开几个虚拟机就已经顶不住了，所以把这些Linux服务器的图形界面关掉，换成命令行界面，CLI：command Line Interface。现在的Linux发行版本登陆界面都是默认的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，因为Linux的启动服务机制发生改变，以下方法将实现Debian系统启用命令行界面，关闭图形界面。
修改Grub配置文件启用命令行界面 1.打开grup配置文件 nano /etc/default/grub 2.修改 GRUB_CMDLINE_LINUX=”” 修改为：GRUB_CMDLINE_LINUX=”text” 3.更新grub update-grub 4.更新系统服务管理器配置 systemctl set-default multi-user.target 5.重启：init 6 附：所要修改的代码如下： # 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 1.打开gdm配置文件 nano /etc/gdm3/deamon.conf 2.配置安全设置 [security] 下一行增加 AllowRoot = ture 即可 3.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 附：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
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