Direct Administrative Access, is obtained through console.
The term console is rather generic, when accessing a Linux system. There are, in fact, several types of console. All of which seem to have an administrative aspect.
Physical Console:- This is the actual physical video/keyboard/mouse on your hardware, represented by /dev/tty0 for VGA, based drivers.
nis 1s the actual physical video/keyboard/mouse on your hiardware, represente0 Dy /devV/ttyo for VGA.
vers xd6 only, but the default on x86), or represented by /dev/EbO Tor tramebuffer-based drive
Non-xB6 architectures and the Xen virtual physical console use the trameDuter, ano it can be used on x86
o0-64, t you see the penguin icons at boot, you are using the frametulter.J
This is one of several full-screen terminal displays provided by the Linux physical oonsole’s driver (vgacon
or fbcon). You can switch between them by typing Ctr-AIL-Fx on the physical console or by using lusri
bin/chvt. At boot, the defauit /etc/inittab causes init to start a text login prompt on the tirst six virtual
consoles and, if in runlevel 5, a display-managed X session to start on the seventh. The first VC is /dev/
tEyl, the second /dev/tty2, and so on.
The mingetty program is used for text logins on virtual consoles. The prefdm program is used to start a
Cisplay-fmhanaged X session.
This is a terminal display connected to a serial port (/dev/ttys ), a text-only interface, since most senal
terminals are text-only. The assumption is that the serial port is cabled to a real serial terminal (ike a DEC
VT100) or to a serial console server (ike a Cyclades TS800)
Fully-virtualized Xen DomUs have a simulated /dev/ttys0 serial console. Paravirtualized Xen DomUs
have a simulated console which is similar to a serial console, /dev/xcvco.
Generally, to provide a text login on a serial console, the /etc/inittab file must be configured to start
the agetty program on the relevant device(s)
The svstem console should be sent system messages, boot messages, and the login or shell prompt in
single-user mode, represented by /dev/console.