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systemd-user-sessions.service(8) [centos man page]

SYSTEMD-USER-SESSIONS.SERVICE(8)			   systemd-user-sessions.service			  SYSTEMD-USER-SESSIONS.SERVICE(8)

systemd-user-sessions.service, systemd-user-sessions - Permit user logins after boot, prohibit user logins at shutdown SYNOPSIS
systemd-user-sessions.service /usr/lib/systemd/systemd-user-sessions DESCRIPTION
systemd-user-sessions.service is a service that controls user logins. After basic system initialization is complete it removes /run/nologin, thus permitting logins. Before system shutdown it creates /run/nologin, thus prohibiting further logins. At the same time it also kills all user processes, so that system shutdown may proceed without any remaining user processes around. SEE ALSO
systemd(1), systemd-logind.service(8), pam_nologin(8) systemd 208 SYSTEMD-USER-SESSIONS.SERVICE(8)

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SYSTEMD-LOGIND.SERVICE(8)                                     systemd-logind.service                                     SYSTEMD-LOGIND.SERVICE(8)

systemd-logind.service, systemd-logind - Login manager SYNOPSIS
systemd-logind.service /lib/systemd/systemd-logind DESCRIPTION
systemd-logind is a system service that manages user logins. It is responsible for: o Keeping track of users and sessions, their processes and their idle state. This is implemented by allocating a systemd slice unit for each user below user.slice, and a scope unit below it for each concurrent session of a user. Also, a per-user service manager is started as system service instance of user@.service for each logged in user. o Generating and managing session IDs. If auditing is available and an audit session ID is already set for a session, then this ID is reused as the session ID. Otherwise, an independent session counter is used. o Providing PolicyKit-based access for users for operations such as system shutdown or sleep o Implementing a shutdown/sleep inhibition logic for applications o Handling of power/sleep hardware keys o Multi-seat management o Session switch management o Device access management for users o Automatic spawning of text logins (gettys) on virtual console activation and user runtime directory management User sessions are registered with logind via the pam_systemd(8) PAM module. See logind.conf(5) for information about the configuration of this service. See sd-login(3) for information about the basic concepts of logind such as users, sessions and seats. See the logind D-Bus API Documentation[1] for information about the APIs systemd-logind provides. For more information on the inhibition logic see the Inhibitor Lock Developer Documentation[2]. SEE ALSO
systemd(1), systemd-user-sessions.service(8), loginctl(1), logind.conf(5), pam_systemd(8) sd-login(3) NOTES
1. logind D-Bus API Documentation 2. Inhibitor Lock Developer Documentation systemd 237 SYSTEMD-LOGIND.SERVICE(8)
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