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systemd, logind, and NAutoVTs and MultiSeat
How to set up multiseat on Centos 7?
NAutoVTs=6
Takes a positive integer. Configures how many virtual terminals (VTs) to allocate by default that, when switched to and are previously unused, "autovt" services are automatically spawned on. These services are instantiated from the template unit autovt@.service for the respective VT TTY name, for example, autovt@tty4.service. By default, autovt@.service is linked to getty@.service. In other words, login prompts are started dynamically as the user switches to unused virtual terminals. Hence, this parameter controls how many login "gettys" are available on the VTs. If a VT is already used by some other subsystem (for example, a graphical login), this kind of activation will not be attempted. Note that the VT configured in ReserveVT= is always subject to this kind of activation, even if it is not one of the VTs configured with the NAutoVTs= directive. Defaults to 6. When set to 0, automatic spawning of "autovt" services is disabled.
ReserveVT=6
Takes a positive integer. Identifies one virtual terminal that shall unconditionally be reserved for autovt@.service activation (see above). The VT selected with this option will be marked busy unconditionally, so that no other subsystem will allocate it. This functionality is useful to ensure that, regardless of how many VTs are allocated by other subsystems, one login "getty" is always available. Defaults to 6 (in other words, there will always be a "getty" available on Alt-F6.). When set to 0, VT reservation is disabled.
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