Clarify TTY and virtual consoles

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Hi,

                I need some help to clarify TTY and virtual consoles. Thanks a lot.

 

                1. I learned that to switch from one TTY to another, one must be at the physical machine. Does the same apply to virtual consoles?

                2. My /etc/inittab includes the following. Does that mean there's only one instance of TTY on my CentOS?

 

                …

                # Run gettys in standard runlevels

                co:2345:respawn:/sbin/agetty xvc0 9600 vt100-nav

                #1:2345:respawn:/sbin/mingetty tty1

                #2:2345:respawn:/sbin/mingetty tty2

                #3:2345:respawn:/sbin/mingetty tty3

                #4:2345:respawn:/sbin/mingetty tty4

                #5:2345:respawn:/sbin/mingetty tty5

                #6:2345:respawn:/sbin/mingetty tty6

 

                3. My CentOS was installed with Base option only. (This should be the minimum.) I don't plan to use any GUI stuff, and I always connect to my CentOS server using SSH. In this case, do I still need virtual consoles and TTYs defined in /etc/securetty?

                4. What does "console" mean in /etc/securetty?

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