Server :: Limit The Suphp User Memory Limit?
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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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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Feb 10, 2010
I have some domains on a VPS server. Typical account memory usage for all domains runs at 50% of available, but I have a problem. One domain is causing me trouble because intermittently traffic will spike on that domain, causing so many requests within 1 min that I exceed my memory allocation for my entire VPS package. Apache is then killed but the virtualization software and Apache must then be restarted.
A sample snippet from tops right before the sever went down would like like this:
All of that memory usage adds up. I would like to "throttle" the number of processes that user/domain can run. I think this would be a quick and easy way to keep the domain from taking down my entire VPS. My understanding is that I could do this with the /etc/security/limits.conf file.
Is that correct?
I have never done this before. Do I want to set a hard or soft limit? I think if I wanted to limit the number of processes for "coldclim" to 15 I would add a line to limits.conf like this:
Code:
Assuming that is correct, can anyone tell me how the website would respond once it reached its limit? Would visitor queries become sluggish, or would the website not come up for them at all?
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May 3, 2011
I ran into a user today that indicated that their company only allows them to log in through a terminal session once (no multiple logins). On second try their login window terminates. They are using putty.Is this being accomplished through PAM or sshd ( or some other method)?
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Dec 28, 2010
my secure log is flooding with these messages..
sudo: pam_limits(sudo:session): wrong limit value 'unlimited' for limit type 'hard'
Dec 28 22:42:29 yn54 sudo: pam_limits(sudo:session): wrong limit value 'unlimited' for limit type 'soft'
Dec 28 22:42:29 yn54 sudo: pam_limits(sudo:session): wrong limit value 'unlimited' for limit type 'hard'
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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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Sep 13, 2010
How can i limit user to their mailbox in specific size.
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Mar 24, 2011
for create an user I put:
useradd username
passwd username
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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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May 16, 2011
Last weekend i have increased the open file size (ulimit -n) for the application user id i have update the limits.conf file with necessary inputs restarted the service and the server as well, when i check the ulimit value for the specific user by switching user from other user it shows the new value (10240) but if i login directly using the application id the ulimit value shows as 1024 which one is the default one.
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Jul 26, 2010
I am trying to configure linux printer Server.
Setup : Using Centos 5.3
Printer : hp 4350
At present we are using windows print server getting user name and authenticated from domain server. I need your suggestion to configure linux printer server and how to share the printer to users and how to limit the user in taking printouts.
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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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Jun 26, 2010
I have a 32 bit Ubuntu installed and my Laptop has 4GB RAM, but only 3GB is considered by Linux. My question is: what is the reason for the upper limit on physical memory ?
Code:
dmesg | grep Memory [0.000000] Memory: 3052428k/3112960k available (4673k kernel code, 56364k reserved, 2121k data, 656k init, 2200904k highmem) I am familiar with the virtual memory concept where linux splits upper 1GB for kernel and lower 3GB for user processes. In total, linux 32bit can address 4GB virtual addresses. Does this meant that 1GB of physical memory is already mapped to 1GB of kernel space and Linux only shows the remaining 3GB physical memory left for the user in the above command.
I did some searching on the internet and found some articles related to this, but it only confused me further since some articles suggest 4GB is the upper limit with mentioning whether it's virtual or physical memory, some bring in the concept of PAE, etc. I'm relative new to Linux's memory management, so it'd be really helpful if someone could answer this.
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May 9, 2011
When I run ardour sound editing I get this message , but it starts ok Your system has a limit for maximum amount of locked memory! This might cause Ardour to run out of memory before your system runs out of memory. You can view the memory limit with 'ulimit -l', and it is normally controlled by /etc/security/limits.conf
bash-4.1$ ulimit -l
64
my limits.conf is like this
audio - rtprio 99
@audio - memlock 250000
[Code]...
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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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Dec 22, 2014
How to limit access flash memory (read / write) for users on debian?
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Jun 25, 2010
I presently have Fedora 12 running on a Dell Optiplex with a Pentium 4 CPU. I want to buy a new computer, probably from Dell, I don't completely understand the options I have available for which Fedora 13 will run.I more or less understand what 64 bit means since I also have an HP with an AMD 64 bit processor. But are there other options which will allow me to exceed the i386 memory limit? How about dual processors?
I used to understand CPU architecture pretty well, but i've lost track of more recent developments. Can anyone recommend a primer of CPU types, including assoicated memory limits? Similarly, I would like to be sure that Fedora 13 will run on whatever machine I decide to get. So a list of available processors, which are equivalent to which, and which Fedora 13 has been tested on,
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May 28, 2010
I have an Ubuntu server running in our small office. Among its many duties is report generation. It uses PHP and DOMPDF (a PHP library for converting HTML/CSS to PDFs for printing). PHP's default memory limit of 32MB is not even close to being enough to pull large amounts of data from the database and generate images/tables/PDFs with that data.
I increased the memory limit to 64MB and that is adequate for reports under 3 pages or so (varies based on table complexity, images, etc). If any user tries to generate a report longer than that, PHP just throws a "out of memory" error and doesn't make the report.
My question is: what are the possible consequences of increasing the memory limit yet again to 128MB or maybe even higher? The server isn't terribly powerful. It has 2GB RAM and 4GB swap space. I know that isn't much but this is a small office and at most I can only see two or three people trying to run reports at the same time. As for security, apache is currently only serving pages in the local network, but sometime within the next year I'll probably have it hosting a public website (currently using a hosting service). Is a high memory limit a potential security risk when exposed to the internet?
EDIT: Sorry, PHP's default memory limit is 16 not 32 as I said. Question still stands, however
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Sep 2, 2010
I'm having a problem with setrlimit() under linux.
If i used setrlimit(RLIMIT_AS) to set a hard ceiling of virtual memory usage first, then request memory more than that, shouldn't i receive a signal like SIGSEGV?
First i tried the command ulimit in bash, which acted as if i called setrlimit(). i tried 3 programs that overflowed the memory limit i set. i though all the programs would be terminated by a SIGSEGV. but the pascal program received SIGKILL; the C++ program got SIGABRT› the C program, SIGSEGV.
I though there maybe something different between setrlimit() and ulimit, so i wrote a program in C++, fork() first, setrlimit() then execv() in the child, and wait(&status) in the parent. but i got the same result.
I was wondering why these could happen, and could anyone tell me how could i deal with them? i mean, how can i judge that the program exited abnormally because it exceed memory limit?
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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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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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Jul 11, 2010
Is there any way to limit user name to characters so when I create an account and if the account name is more than 8 characters long, it will not allow.
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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 3, 2009
Is it possible to limit each user so that only one can connect via each username for ssh/sftp? I work with a small company where there aren't really enough of us to justify using a revision control system, but we don't want to accidentally step on each other's toes, so we'd like to try simply preventing more than one person from accessing a given domain at once.
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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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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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Mar 9, 2010
I running Squid 2.7. I using NCSA veryfication so only registered users may use proxy server. I want to allow only 1 connection to proxy for 1 user. Why not per ip ? Alot of users have dynamic IP's and i want to avoid password sharing beetween users. Any idea how to do it in squid ? Mb other autentyfication system connected to squid granting access to proxy server ?
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