Ubuntu 18.04串口终端开机免密自动登录

serial getty开机设置选项

ubuntu18.04已经不再使用initd管理系统,改用systemd

serial getty

打开文件 vim /lib/systemd/system/serial-getty\@.service

开机设置选项

  ExecStart=-/sbin/agetty --autologin root --noclear %I $TERM

文件部分内容展示

  [Service]
  # The '-o' option value tells agetty to replace 'login' arguments with an
  # option to preserve environment (-p), followed by '--' for safety, and then
  # the entered username.
  ExecStart=-/sbin/agetty --autologin root --noclear %I $TERM
  Type=idle
  Restart=always
  UtmpIdentifier=%I
  TTYPath=/dev/%I
  TTYReset=yes
  TTYVHangup=yes
  KillMode=process
  IgnoreSIGPIPE=nostem/serial-getty@.service" 46L, 1468C
  SendSIGHUP=yes