Unknown key name 'StopIdleSessionSec' in section 'Login'

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Hello, from a novice at system administration and systemd.

A week ago, I installed Google Chrome on a Debian 11 VPS to get access to a headless browser. Soon afterward, ConfigServer (CSF) began sending alerts that 2 processes were exceeding the limit. These 2 processes are:

/lib/systemd/systemd —user
(sd-pam)

The VPS only has two (reseller) users that these processes are running under.

Searching around, I found an article (*1) that seemed to address the situation. In another article (*2), I found the configuration file, incidentally, with every key commented out.

In this config file: /etc/systemd/logind.conf, I added 'StopIdleSessionSec=600’, then restarted logind with:

# systemctl restart systemd-logind

And checked for status with:

# journalctl -u systemd-logind

wherein, the following lines are at the end:

Oct 23 11:35:39 vps.lan-software.com systemd[1]: Stopping User Login Management...
Oct 23 11:35:39 vps.lan-software.com systemd[1]: systemd-logind.service: Succeeded.
Oct 23 11:35:40 vps.lan-software.com systemd[1]: Stopped User Login Management.
Oct 23 11:35:41 vps.lan-software.com systemd[1]: Starting User Login Management...
Oct 23 11:35:41 vps.lan-software.com systemd-logind[94302]: /etc/systemd/logind.conf:43: Unknown key name 'StopIdleSessionSec' in section 'Login', ignoring
Oct 23 11:35:41 vps.lan-software.com systemd-logind[94302]: System has /dev/tty0 but not /sys/class/tty/tty0/active which is broken, ignoring: No such file or directory
Oct 23 11:35:41 vps.lan-software.com systemd[1]: Started User Login Management.
Oct 23 11:35:41 vps.lan-software.com systemd-logind[94302]: New seat seat0.
Oct 23 11:35:41 vps.lan-software.com systemd-logind[94302]: New session 2266973 of user root.

I think the Chrome installation did something that is causing systemd to start a session, but not close it.

How can I get these 2 processes to shutdown?  

Is this an issue with systemd or in the configuration of Chrome?

Trying to learn to be a better system admin,

David


*1 - https://www.admin-magazine.com/Archive/2024/79/Automatically-terminate-OpenSSH-sessions
*2 - https://manpages.debian.org/testing/systemd/logind.conf.5.en.html


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