All about resource limits that can be set with the ulimit command

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1answer
37 views

How can I determine what individual ulimit constraint a process has?

I have a service that sets a custom limit for open files (ulimit -n 5000) as part of its init script. My understanding is that this will be effectively for the service and its child processes. Since ...
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1answer
1k views

Cant ssh, connection terminates immediately with exit status 254

The most recent thing I remember is changing the soft and hard memlock ulimit to unlimited. Now I cant ssh into the machine. This is the ssh log. Authenticated to IP ([IP]:22). debug1: channel 0: ...
3
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1answer
71 views

Different between `ulimit -e` and `renice`?

I would like to run a backup script in low CPU and disk I/O. Is there any different between this: #!/bin/bash ulimit -e 19 ionice -c3 -p $$ and this: #!/bin/bash ionice -c3 -p $$ renice -n 19 ...
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2answers
87 views

How do I configure logging for ulimits?

I was wondering if anything gets logged when any ulimits are hit (open files, etc). If so, where is this logged, and what should I be looking for? I'm using CentOS 6.
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1answer
183 views

Understanding the difference between pid_max, ulimit -u and thread_max

I am trying to understand the Linux processes. I have confusion on the terms pid_max, ulimit -u and thread_max. What exactly is the difference between these terms? Can someone clarify me the ...
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0answers
82 views

Process specific ulimit still low after changes to soft and hard ulimits

I'm having trouble with increasing the open-files ulimit (ulimit -n) for a particular process on a Debian 6 server. AFAIK I've done everything to change the servers hard and soft limits in this case, ...
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1answer
590 views

Ulimit unlimited stack behavior oddity

I am running an application on a Solaris 10 system. Yesterday we have set the process stack size to unlimited: ulimit -s unlimited Today during the load the process would not come up reporting ...
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1answer
348 views

What are the effects of increasing hard and soft limits for ldap user

I've been having some instability issues with my LDAP server. I have ~2000 machines connecting to it. Using netstat -pant | grep slapd, I can typically see 1500+ connections from the clients to the ...
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1answer
274 views

Does 'ulimit -m' not work on (modern) Linux?

This article claims that the -m flag to ulimit does nothing in modern Linux. I can find nothing else to corroborate this claim. Is it accurate? You may try to limit the memory usage of a process ...
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1answer
575 views

How to configure the process open file limit of a user?

The default open file limit per process is 1024 on - say - Linux. For certain daemons this is not enough. Thus, the question: How to change the open file limit for a specific user?
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0answers
159 views

ulimit vs. limit on FreeBSD 8.3

I had the same issue with the error as this and this question (both of which I read and understood), the message being: $ ulimit -n 20000 ulimit: bad limit: Operation not permitted I encountered ...
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0answers
86 views

Find and close/unlink message queues in the system

I have a SLES-11 machine on which I am not the root where I am building software code that makes extensive use of message queues. Due to some bugs, Now have an error: mq_open: Too many open files I ...
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0answers
98 views

Ulimits and pam modules

Can you explain me the relation of ulimit setting on a proccess and line session required pam_limits.so in pam module. In wich modules i really require this line? I have this line in pam.d/su ...
2
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2answers
539 views

Are limits in linux (like those controlled by ulimit or /etc/security/limits.conf) per user or per user per process?

I saw three copies of a process running and one of them cored in what seems like memory issue. Each individually occupies about 3-4 GB of memory..would a limit account for killing one of them? And if ...
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3answers
24k views

do changes in /etc/security/limits.conf require a reboot?

do changes in /etc/security/limits.conf require a reboot before taking effect? Like if I have a script that sets the following limits in /etc/security/limits.conf, does this require me to reboot ...
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3answers
11k views

How to persist ulimit settings in OSX Mavericks?

Before Mavericks, one could use /etc/launchd.conf to persist ulimit settings, for example: limit maxfiles 16384 unlimited limit maxproc 16384 unlimited It no longer works in Mavericks. What is the ...
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1answer
50 views

Does changing ulimit get logged Mac/FreeBSD

For some reason our open files ulimit (-n) is getting changes to 256 when it should be 1024. I tried searching for limit in /var/log/{system.log,secure.log} but didn't see anything useful. Any idea ...
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2answers
1k views

Setting ulimit correctly for PHP on Linux

I have /etc/security/limits.conf set to the following: nobody soft nofile 409600 nobody hard nofile 1024000 phpuser soft nofile 409600 phpuser hard nofile 1024000 httpd soft nofile 409600 httpd hard ...
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1answer
3k views

Modify 'Soft Limit' of 'Max processes'

I tried ulimit -u 2000 and ulimit -Su 2000 to modify the 'Max processes', and started up my program, but failed. I found file '/proc/pid/limit' is still: Max processes 1024 ...
0
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1answer
108 views

Running git with higher memory allocation

I am facing memory/data segment issues while running git. However, if I set my ulimits to a bit higher like below. ulimit -m 262144 ulimit -d 262144 It runs fine. Don't we have anyway to allocate ...
0
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1answer
492 views

Set ulimit to defaults

I set ulimits to fullfill memory demands of Git. Do we have anyway to reset ulimits to defaults, I mean what they were before I set them. Please keep in mind I am doing it from Python script
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1answer
198 views

No virtual memory (-v) item in output of ulimit -a

When I run command ulimit -a, I see no virtual memory item in the list of output of the command. It is unlimited for some user IDs though. Does that mean I am assigned no virtual memory?
5
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1answer
983 views

limits that are set in an unmodified environment

If /etc/security/limits.conf has not been edited or changed, there are nothing but comments. However 'cat /proc/self/limits' shows there are some limits in effect. Are these compiled into the kernel? ...
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1answer
3k views

How to circumvent “Too many open files” in debian

If I want to see all relevant log files of my apache2 server at once, I use tail -f /var/kunden/logs/*log /var/kunden/logs/*log /var/log/apache2/*log |grep -v robots|grep -v favicon But since those ...
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2answers
1k views

How to prevent fork bomb?

To prevent fork bomb I followed this http://www.linuxhowtos.org/Tips%20and%20Tricks/ulimit.htm ulimit -a reflects the new settings but when I run (as root in bash) :(){ :|:&};: the VM still goes ...
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1answer
3k views

Limits on the number of file descriptors

I'm trying to install 389-ds, And it gives me this warning : WARNING: There are only 1024 file descriptors (hard limit) available, which limit the number of simultaneous connections. I understand ...
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1answer
2k views

ulimit & rlimit in Linux, are they the same thing?

I see people use the terms ulimit & rlimit interchangeably, can I say they are referring to the same thing?
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1answer
69 views

Can you think of a way to stop the generation of a core file WHILE it is happening?

I was just wondering if you can think of a clever way to stop the creation of a core file while it is being produced. I understand that there are several way to disable the creation like setting ...
4
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2answers
8k views

Modify ulimit (open files) of a specific process

Is it possible to change the soft - and hard limit of a specific process? In my case, my process is mongod and a lot of web resources tell me to simply execute: ulimit -n <my new value> My ...
9
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2answers
669 views

How to solve this memory issue gracefully?

I have a standard Linux (Debian testing) laptop, with a swap partition. I do a lot of experiments with it. Some of them are really memory hungry and the way Linux behaves by default is an issue for ...
3
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1answer
789 views

Setting ulimits without PAM

How to do that? Without PAM on my GNU/Linux OS the number of open files is 1024 by default and cannot be raised above 4096 (via ulimit -n NNNN command) despiting what is written in ...
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1answer
11k views

How to modify ulimit for open files on SUSE Linux Enterprise Server 10.4 permanently?

SERVER:/etc # ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited file size (blocks, -f) unlimited pending signals (-i) 96069 ...
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1answer
154 views

Max Open Files, clarification needed

On my machine, ulimit -n returns 2560 Given that -n returns The maximum number of open file descriptors. Does it mean that system won't allow more then 2560 open files to be out there at any ...
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0answers
732 views

Permanently change per-process stack size

When I use ulimit -s to change the per-process stack size, it only lasts for that login; if I restart the setting is lost. How can I permanently change the maximum stack size on my system?
11
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2answers
6k views

How to Throttle per process I/O to a max limit?

I'm looking for a way to limit a processes disk io to a set speed limit. Ideally the program would work similar to this: $ limitio --pid 32423 --write-limit 1M Limiting process 32423 to 1 megabyte ...
3
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2answers
4k views

What are the dangers of setting a high limit to max File Descriptors per process?

I'm working on an old legacy application, and I commonly come across certain settings that no one around cam explain. Apparently at some point, some processes in the application were hitting the max ...
3
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1answer
406 views

Is there any use for RLIMIT_NICE?

I am using prlimit in Ubuntu to do some resource restrictions in my sandbox which has been very helpful. However, I am not quite sure what to do with RLIMIT_NICE. The docs say: RLIMIT_NICE (since ...
23
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1answer
21k views

ulimit: difference between hard and soft limits

What is the difference between hard and soft limits in ulimit? For number of open files, I have a soft limit of 1024 and a hard limit of 10240. It is possible to run programs opening more than 1024 ...
46
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4answers
42k views

Limit memory usage for a single Linux process

I'm running pdftoppm to convert a user-provided PDF into a 300DPI image. This works great, except if the user provides an PDF with a very large page size. pdftoppm will allocate enough memory to ...