Solved

bash script to count red hat linux concurrant logins

Posted on 2015-01-12
8
273 Views
Last Modified: 2015-01-13
Our server run red hat Linux AS 5.4 with over 700 users connected.  We would like to limit users to 3 concurrent logins.  Red hat support has told me there is no built in method for limiting users to 3 concurrent logins.  

1.  Is Red Hat support correct, is there a way to limit user logins to 3 concurrent logins?
2.  Is there a simple way to identify users with multiple concurrent logins?

Thanks
0
Comment
Question by:epmmis
  • 2
  • 2
  • 2
  • +1
8 Comments
 
LVL 48

Accepted Solution

by:
Tintin earned 400 total points
ID: 40545502
Edit /etc/security/limits.conf and set

*      hard maxlogins 3
0
 
LVL 23

Expert Comment

by:savone
ID: 40545537
How are the users logging in?  Is it via SSH?

You can run something like this to see how many people are logged in:

for i in `cat /etc/passwd | cut -d: -f 1`; do u=`who | grep -c $i`; echo $i has $u concurrent logins; done
0
 
LVL 40

Assisted Solution

by:omarfarid
omarfarid earned 100 total points
ID: 40545949
To find out how many logins per user, run

who | awk '{ print $1 }' | uniq -c
0
Microsoft Certification Exam 74-409

Veeam® is happy to provide the Microsoft community with a study guide prepared by MVP and MCT, Orin Thomas. This guide will take you through each of the exam objectives, helping you to prepare for and pass the examination.

 
LVL 23

Expert Comment

by:savone
ID: 40546451
@omarfarid, I like it! Very clean output!  Seems to taught two people something today and this is why I love Experts Exchange.
0
 

Author Comment

by:epmmis
ID: 40546868
TinTin - I am now looking into using /etc/security/limits.conf to limit the concurrent logons.  Any advice about implementing the limit?  Does the server need to be rebooted?

@omarfarid - thanks for the script It is easy and clean output.  

@savone - I tried your code on the command line.  The for loop did not work.  I have yet to put the code in a script.
0
 
LVL 40

Expert Comment

by:omarfarid
ID: 40547052
Thank you all :)

Since I started participating in Experts Exchange my skills and knowledge improved a lot.
0
 
LVL 48

Expert Comment

by:Tintin
ID: 40547714
Pretty certain you don't need a reboot after changing limits.conf

Easiest way is to just try.
0
 

Author Closing Comment

by:epmmis
ID: 40547780
TinTin - you get 400 points because your answer is spot on.
 omarfarid - you get 100 points because your script will help me identify the users which need to be controled by the limits.conf file.
0

Featured Post

Comprehensive Backup Solutions for Microsoft

Acronis protects the complete Microsoft technology stack: Windows Server, Windows PC, laptop and Surface data; Microsoft business applications; Microsoft Hyper-V; Azure VMs; Microsoft Windows Server 2016; Microsoft Exchange 2016 and SQL Server 2016.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
digital ocean web console access ? does it use port 22 4 25
wifi not working on Raspberry Pi 3? 2 81
Samba Question 11 77
linux - yum package installation issue 2 63
The purpose of this article is to fix the unknown display problem in Linux Mint operating system. After installing the OS if you see Display monitor is not recognized then we can install "MESA" utilities to fix this problem or we can install additio…
The purpose of this article is to demonstrate how we can use conditional statements using Python.
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.
In a recent question (https://www.experts-exchange.com/questions/29004105/Run-AutoHotkey-script-directly-from-Notepad.html) here at Experts Exchange, a member asked how to run an AutoHotkey script (.AHK) directly from Notepad++ (aka NPP). This video…

829 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question