General :: Limit "su" Usage To Only 1 User Account?
Apr 29, 2011
I've noticed that "su" can be run from any user account so long as the user knows the root password.What if I want to limit the ability to "su" to only 1 user account? For example: Pretend my desktop has 4 different user accounts. Currently each user account could run "su" for root access if the person sitting in front of the screen knows the password.
1) Could I somehow make only 1 of the 4 user accounts able to "su" into root mode?
2) If yes, then would doing so have any side-effects?
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Jun 24, 2010
I am a user of a cluster. I don't want root to see/copy files from my user account(obviously). Is that possible to limit the access of root to users account?
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Jan 7, 2011
I have a webserver with a few users on and i wonder how i can limit the bandwith usage for each user on my server ?
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Apr 2, 2010
recently i rent a xen vps intended to setup a PPTPD vpn server for me and my friends. so we can by-pass the great firewall in china and get back on ....., facebook and stuff. i have already setup the server and i can connect to it without any problem. but i still want to do some further configuration the server:
1. i want to limit the bandwidth to 400k/s per connection.
2. i also want to limit the max connection per user a/c
i have some thoughts on the 2nd requirement. in the user configuration file of /etc/ppp/chap-secret, you can specify the range of ip the user can get, does it limit the max connection per user a/c? or they can connect anyway, just every now and then a box pop up says conflict in IP address?
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Sep 21, 2009
I'm writing a shell script which aims to create a safe gtared (xxx.sql.gz) copy of MySQL databases.This script is planned to be Cron-Jobed.
Well, what I need to add to this shell, is something that limit CPU usage for the whole process (just in case if the database being generating is a huge one.)So, after few time of googling I found couple of solutions:
- Using cpulimit.
I tried to place the code in Position(1) and Position(2) but it didn't seem to be working fine.. Any idea about the right use?
And the other Solution is:- Using nice.
Well, assuming I named my shell script (sqlbacker)..
Finally, this is my first time I ever write a shell, so correct me if somewhere I made a mistake :-)
(The script itself works perfectly)
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Jan 26, 2010
There's a disfunctional process eating copious cpu time.Is there a way to effectively assign it a high nice value? I need to do this whenever it runs, for whatever reason, and I can't be bothered to track down all the scripts and scenarios that cause it to run and change the script to use nice. And I can't be bothered to manually run renice whenever I notice that it's running.
I want the OS to automatically assign a high nice value to this process, perhaps based on the processes name. Is this possible?Presumably, a cron job could run every 5 minutes and run "renice" on every process matching a given name, but I'm hoping for a solution with more finess.
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Apr 24, 2010
I've written a program for a class that my professor will be testing in various low memory environments to see how it behaves when the program runs out of memory. Is there a way I can simulate the execution in a low memory environment without creating a virtual machine?
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Dec 4, 2010
How can I limit printer usage by SAMBA server?
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May 12, 2010
I have a VPS server with 512 MB memory. The php.ini is set so script memory limit = 16 MB. However, I have noticed in my top report, instances like the following:
Quote:
5484 coldclim 25 0 46476 32m 5920 R 0.0 6.4 0:00.93 php
The bold number of 6.4 is the % of sever memory this process is using. 6.4 % of 512 MB of memory is about 32 MB of memory, so it appears that this isn't being limited by php.ini. Am I correct? This leads to the next question: Is there some way to limit the amount of memory a single suphp process can use? (Basically, something like the setting in php.ini which limits suphp processes in the same way.)
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Apr 1, 2011
Everytime CPU reaches around 85% of maximum it shuts down due to overheating. What I want to do is be able to throttle the cpu to 75% so it never goes above that. I don't want to just throttle individual programs which I think is what CPULimit does right? The fans are failing but I can't afford to get fixed. I just want to use it for email and web browsing usually.
I have cleaned dust out, use in a well ventilated room, use a cooling stand etc but still when CPU gets to approx 85% then whala it shuts itself down. Have been using with XP but just switched to Ubuntu and have only had it shut down once so far.
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Aug 18, 2010
I need to limit the ram usage under the below scenario,
" having 8GB of ram, need to limit the ram usage up to 4GB, thereafter must use swap only"
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Jul 12, 2011
i have a linux server which users connect to with SSH. my users only upload and download content from their /home folder.
Basicly, I want them to be limited to see and use only their home folder.
I read that it might not be a good idea to do so, since they nead read premissions to run programs and scripts, but again: they are only downloadinguploading content to their home dir.
How can I do it?
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Sep 29, 2010
Im using squid proxy server..i want to limit bandwidth for single user using squid proxy.
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Aug 3, 2011
Im new to linux and would like help or to be taught. My question is how do i limit users to their own directory for an example User andrew /home/andrew cant acess root or usr
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Dec 13, 2010
I recently read a windows tip which read: - Windows allots 20% of the bandwidth by default for various services like Windows update, spyware checks etc. We can get hold of this bandwith by changing the values of limit reserve bandwidth under QOS packet scheduler. Now my questions: How to limit the bandwidth usage used by ubuntu updates in the above lines?
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Aug 29, 2011
Limit every user to his own home folder only.I have a web server running 10.04 LTS and as a newbie in the world of server administration, I'm in a bind.Right now, I have three users. Root, which obviously has access to everything, and two other users that each own a website.For these two users, their website is located in their respective home folder in an extra folder they each have Read, Write & Execute permissions on. This is the only folder they can write to. They cannot delete it, or change anything outside the folder.
So far so good, except that by default, they can also read any file in the system, meaning they can navigate to my other websites' folders and read, for instance, the database passwords from WordPress config files.This is obviously problematic.The users access their files and folders through SSH with FileZilla.
How can I prevent these users from reading sensitive data, i.e. how can I restrict their access to only their home folder?The users must continue to login through SSH with FileZilla (i.e. no FTP solutions)Apache must still be able to access the user's folders (i.e. cannot chmod to 750)Folder containing the command line tools (/bin/bash I think) will probably have to be symlinked in the user's home folder?
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Nov 22, 2008
I am newbie for Linux I want to script for bandwidth Limite per user MAC based also how can i add user MAC and where to add? I want per user 16Kbps each user.
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Aug 13, 2011
I was looking into using control groups to limit the memory usage of each user on my CentOS system. I was told that this required me to recompile the kernel to have cgroup support. Is this true? Or is there a kernel module that will allow cgroups to work for users and groups on the system without kernel re-compile? Or, is there another way to limit the users memory usage? I have tried ulimit and it doesn't seem to work right.
I ask since this setup will be on a VPS system, that means to re-compile the kernel I need to use Xen instead of OpenVZ. Plus I have never in my life re-compiled the kernel, least of all with different modules ha ha ha so I would have to pay my NOC to do it. So if I don't HAVE to recompile the kernel to get cgroup support.
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Jun 28, 2011
I was wondering how to allow someone to use a user account for two hours a day. After this time, it will log them out, and not allow them to sign back in until the next day. How can I do this?
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Apr 5, 2011
Can I, with only the use of IPTABLES, limit the incoming bandwith for a protocol? We have for example servers that have a FTP and HTTP server running and whenever HTTP has a lot of connections open, the other uploads/downloads get a timeout. I know I can limit the number of connections but prefer to limit on protocol level. Is this possible using IPTABLES and if so, can someone indicate how to proceed or provide a link? If it's not possible can someone point me to the right tool for the job?
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Jul 24, 2009
I have a few multi-user servers in an academic laboratory. I am having a problem with some users maxing out the available RAM, causing such sever slowdowns the machine essentially crashes. My servers are Dell Power Edge's running Ubuntu 8.10 Server Edition (Not my choice). I would like to set a maximum limit on the amount of ram a user can utilize. This morning I experimented with setting limits via /etc/security/limits.conf and using ulimit. Neither of them prevented my test program, a simple infinite loop of mallocs, from crashing the server.
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Jul 16, 2011
I have a problem with the Google search box top right corner in Konqueror, when entering search I recieve an error page "Unsupported Protocol" Google asks for ioslave or kioslave. Also when highlighting text on a page and right clicking with the mouse no search option is given. I created a new user and all works as it should for the new user. What is wrong with my user account? I have reset default values in Konqueror setup.
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Oct 29, 2010
Im trying to limit the diskspace users on the system may consume, and i found quotas (im a total linux noob). But when i try to set it, no matter what i set it to the maximus is 2 GB. Now... i need quite a lot more than that. One user should be able to use 1900 GB and the other 600 GB. How can i fix this? Im using ubuntu server 10.04.
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Jun 5, 2010
I have two Fedora 10 boxes. Both have a user account, Andrew. I use this account all the time.
Now when I put my USB drive (ext3-filesystem) in box I, create a file in it. It works. But when I attach it to box II and try to access the files, it gives me error - Permission denied. I have to use
Quote:
sudo chown -R Andrew
Only then I am able to access the files in it.
When I attach my drive to box I again, it also gives me error - Permission denied. So in both boxes, I have to use
Quote:
sudo chown -R Andrew
first. Otherwise I get Permission denied message.
This means Andrew on both systems is different. How can I make Andrew account on both systems same? So that I can access files on my usb drive without running chown all the time.
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Feb 19, 2010
two days before I have formatted my / partition and everything seems to working fine. Next day I came to office and try to login as root through ssh. I am getting the error: [sunheer@svn ~]$ ssh root@192.10.10.23
root@192.10.10.23's password:
Permission denied, please try again.
root@192.10.10.23's password:
I thought the password were wrong and I rebooted the server in to run level 1 and reset the password and it started to work. Again on next day the account got same problem.his started to happen after formatting the / partition
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Apr 15, 2009
I've been looking for this feature for months and couldn't find a solution for this. Does anyone know how to create users and limit the user to a specified directory?
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Mar 29, 2011
how to find the only particular user (usage) of memory information
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Dec 3, 2008
I want to know how to change a password to an user account. Can someone give me the syntax on how to do this? I was using usermod but it's not working (usermod -p 123456 user1). Is there other way beside usermod? I am using RHEL5.
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Aug 20, 2009
I did an adduser to create a new account, but i forgot to add a description to the account, so it just looks like this when i look at the passwd file. how can i go back and add one? all my other accounts have descriptions after the two numbers.
testuser:x:512:512::/home/testuser:/bin/bash
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Dec 21, 2010
I just installed Slackware 32bit 13.1. I created a new user with everything default. When I startup and logoff, I hear the startup and logoff sound. But other than that I have no sound in my user account I made. So I did some googling and found this command
Code:
So I logged in the terminal as root and gave it a try. Logged out then back in the user. And I still have no audio.
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