How to limit maximum number of user accounts

jayden · 04-23-2015, 10:09 PM

Is it possible to limit maximum number of user accounts?

My kernel version is 2.6.32. So It can support 4 billion user accounts now
But I hope to limit the quantity

I believe there is some ways to fix this, but I can't find the solution by myself.

jayden · 04-23-2015, 10:21 PM

I find some result.
It seems that It shows some solution. But I can't understand what does it mean

Linux+ Study GUide document by Roderick W.Smith
It says like below
"(The limit is 65,536 users with the 2.2.x kernels and over 4.2 billion with the 2.4.x kernels, including root and other system accounts. The limit can be set lower in configuration files or because of limits in support programs.) "

RMLinux · 04-23-2015, 10:57 PM

login or users?

i found one here.. http://stackoverflow.com/questions/1...ogins-in-linux

some info: http://www.linuxquestions.org/questi...-linux-258198/

jayden · 04-24-2015, 12:06 AM

thanks for your help, But.. already read these two article before
and the issue is "To limit number of user account which linux can has", Not 'the number of user log-on session quantity at one time"

Quote:

Originally Posted by RMLinux

login or users?

i found one here.. http://stackoverflow.com/questions/1...ogins-in-linux

some info: http://www.linuxquestions.org/questi...-linux-258198/

veerain · 04-24-2015, 12:33 AM

Look at the file '/etc/logins.def'. With this we can limit the number of creatable users. (UID_MIN, UID_MAX and friends)

jefro · 04-24-2015, 05:12 PM

Tell yourself not to make too many users. Root account is only user that should be allowed to make users.

I guess it might be possible to limit size of file(s) that are used in process.

Might be possible to use some other logon means where maybe a user could get created but never be allowed to access.

jayden · 04-27-2015, 01:21 AM

Thanks for your help

Quote:

Originally Posted by veerain

Look at the file '/etc/logins.def'. With this we can limit the number of creatable users. (UID_MIN, UID_MAX and friends)