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Hello,
my Terminal Server Version is: NoMachine Terminal Server Subscription – Version 6.9.2
and I am running it on Suse Linux Enterprise Server 12 SP5 which is virtualized in VMWare ESXi 6.7.0 Update 3.In our company we use the Terminal Server to offer our employees access to other systems via RDP and XDM and (x)VNC.
Our employees are using the webplayer and our admins are using the installed Enterprise Client player.1)
I have some big performance issues after around 1 week of runtime. I ran into some ressource problems, where no more session can be generated and the weirdest things happens (Error 11 no threads can be generated)…. Also the webplayer show the weirdest things to my employees in this error-state.
Only rebooting the virtual machine + ESXi host helps.
I send all logfiles + config files and ESXi settings screenshots to your support email.
I also set all /etc/security/limits.conf parameters to unlimited where it is possible and the number of open files to the maximum allowed. Did not help.
I saw on a fresh reboot the number of processes are around 340. During crash it is about 580 processes, but with no or few users logged in. Seems that they aren’t terminated correctly and so the number increases.
What is the problem in my case?2)
Moreover I have set the “EnableCredentialsStoring” parameter to “none”, but in webplayer and player users still can save their credentials…Kindly waiting for your help, thank you!
I did another Test, seems I have a problem with getting ma /etc/security/limits.conf working…
ATORNX002:~ # ps -ef | grep “nxserver.bin –daemon”
nx 1751 1 1 14:54 ? 00:00:01 /usr/NX/bin/nxserver.bin –daemon
root 2403 2339 0 14:55 pts/0 00:00:00 grep –color=auto nxserver.bin –daemon
ATORNX002:~ # cat /proc/1751/limits
Limit Soft Limit Hard Limit Units
Max cpu time unlimited unlimited seconds
Max file size unlimited unlimited bytes
Max data size unlimited unlimited bytes
Max stack size 8388608 unlimited bytes
Max core file size unlimited unlimited bytes
Max resident set unlimited unlimited bytes
Max processes 71327 71327 processes
Max open files 4096 4096 files
Max locked memory 65536 65536 bytes
Max address space unlimited unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals 71327 71327 signals
Max msgqueue size 819200 819200 bytes
Max nice priority 0 0
Max realtime priority 0 0
Max realtime timeout unlimited unlimited usIn my conf file I have set the following:
nx soft nproc unlimited
nx hard nproc unlimited
nx soft as unlimited
nx hard as unlimited
nx soft nofile 1048576
nx hard nofile 1048576
nx soft sigpending unlimited
nx hard sigpending unlimited
nx soft stack unlimited
nx hard stack unlimited
nx soft msgqueue unlimited
nx hard msgqueue unlimitedI also did a reboot, but settings dont work.
What has changed recently on the system in the past week?
Have you already checked this article which is for similar issues and followed the advice there:
Troubleshooting issues caused by system resources exceeded on Linux
https://www.nomachine.com/AR04O00927Also the webplayer show the weirdest things to my employees in this error-state.
What things? Can you submit screenshots of an example of what users see? What browser(s) are they using?
Moreover I have set the “EnableCredentialsStoring” parameter to “none”, but in webplayer and player users still can save their credentials…
Provide a screenshot of what users are seeing when they are at the authentication stage.
Was access via the browser working correctly beforehand? Was the EnableCredentialsStoring key working correctly before this? (we checked that it’s working in the latest version by the way). That key is set on the server, and setting to None will mean users won’t see the checkbox at the authentication stage.Hello,
the only difference in the past was, that my system was used only by 2-3 users and I allowed now more users to use the systems (up to 20-30 simultaneously). Last week in config files I disabled some unnecessary (for our cases) features like balloon messages, monitor win, pulseaudio and so on to save resources.I have already checked your linked article, this was the reason I edited the /etc/security/limits.conf.
But I don’t understand, why my set limits don’t work for nx user.
For every other user my set limits works….The credentialstoring “none” worked in the past, but I cannot say if it was the ressource problem crash, or some other parameter in my config file, that it doesn’t work anymore.
I also saw that the authentication page in webplayer is “English” now (with checkbox for saving credentials) and after that it is “German” again, as set in config files.Attachments:
Hi, I got an answer from one of our webplayer users. During this ressource-error-state users saw the message “Node was not retrieved” (see screenshot).
Moreover they saw another message like: “Service gesperrt” (German), I think in English it should be like “Service locked” (unfortunately no screenshot available).Attachments:
The logs show several errors and carrying out a thorough debug of the affected server is not something we can do via the forums. You should consider opening a support ticket.
But overall I would say that the machine is overloaded.
You wrote:
the only difference in the past was, that my system was used only by 2-3 users and I allowed now more users to use the systems (up to 20-30 simultaneously).
If there is 16G ram tjhis could be the problem if there are many users are there. See our test comparisons here:
https://www.nomachine.com/AR02P00966 for example. In a light environment (centos 6 with old Gnome which doesn’t consume resources like more modern systems)……Number of concurrent sessions actively used without performance penalties:
i) 13 users can surf the internet with Firefox with 8 GB of memory usage and 87% overall CPU usage.
ii) 5 users working on a 3D cad app (FreeCad) with 5 GB of total memory usage and 82% overall CPU usage.
iii) 32 users using a text editor (LibreOffice) with 12 GB of total memory usage and 86% overal CPU usageon NoMachine Terminal Server (2.40 GHz, 6 Cores, 20 GB RAM)
Try upgrading the hardware of the TS host.
Thank you for your input.
Generally I don’t believe, that the machine is overloaded, because on ESXi interface CPU usage is never above 4% utilization and the virtual machine has 18GB RAM assigned and the maximum usage was 10GB (when all 30-40 user are logged in and use the custom RDP and VNC sessions).May I ask you if you can answer these 3 questions for me.
1) I think I have to look, why /etc/security/limits.conf don’t work properly for the NX user, but works great with all other users.
Have you ever seen this before? Do you know, if I have to configure the limits for NX user on another place?2) Can there be some limits in htd.cfg (because all my employees use the webplayer)?
For example in this parameters:
#
# All these directives control the management of NXHTD’s
# subprocesses for handling individual HTTP requests.
#
StartServers 1
ThreadLimit 255
ThreadsPerChild 240
ServerLimit 16
MaxRequestWorkers 1920
MinSpareThreads 25
MaxSpareThreads 753) How can I reset the server.cfg and node.cfg to defaults?
Because of the bug in “EnableCredentialsStoring” I want to start again from zero, and reconfig my needs.Thank you!
Hello,
in case of limits per user, questions are for kernel and operating systems. NX user and any other users are under kernel control. I think processes
are not simply counted as they can have many threads, and every thread is counted as well.Resource limit is controlled by kernel, so when you have issue try to find which process has a lot of files in use, which one has a lot of threads etc
There are system tools which can help as lsof or ps.We have a guide available at:
https://www.nomachine.com/AR04O00927which contains for example answers for your question regarding where limits are set for user nx if not in limits.conf
[…]
Systemd limits are set in the following files:
/etc/systemd/system.conf
/etc/systemd/user.conf
[…]For default configuration file, during installation, setup is checking what kind of system it is, what tools are available among those required etc so there is no one default config key.
If you need clear one, uninstall nx, remove .cfg and install again.Hello,
thank you for your input, seems that /etc/systemd/system.conf is the solution. (Sorry I totally missed that part in your guide)I edited the following parameter in system.conf:
DefaultTasksMax=infinity
DefaultLimitSTACK=infinity
DefaultLimitNOFILE=1048576
DefaultLimitNPROC=infinity
DefaultLimitMEMLOCK=infinity
DefaultLimitSIGPENDING=infinity
DefaultLimitMSGQUEUE=infinityBefore editing limits for NX user was:
DefaultTasksMax=512
DefaultLimitSTACK=8388608
DefaultLimitNOFILE=4096
DefaultLimitNPROC=71327
DefaultLimitMEMLOCK=65536
DefaultLimitSIGPENDING=71327
DefaultLimitMSGQUEUE=819200Now:
ATORNX002:~ # ps -ef | grep nxserver
nx 1721 1 3 12:15 ? 00:00:01 /usr/NX/bin/nxserver.bin –daemon
root 2384 2331 0 12:15 pts/0 00:00:00 grep –color=auto nxserver
ATORNX002:~ # cat /proc/1721/limits
Limit Soft Limit Hard Limit Units
Max cpu time unlimited unlimited seconds
Max file size unlimited unlimited bytes
Max data size unlimited unlimited bytes
Max stack size unlimited unlimited bytes
Max core file size unlimited unlimited bytes
Max resident set unlimited unlimited bytes
Max processes unlimited unlimited processes
Max open files 1048576 1048576 files
Max locked memory unlimited unlimited bytes
Max address space unlimited unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals unlimited unlimited signals
Max msgqueue size unlimited unlimited bytes
Max nice priority 0 0
Max realtime priority 0 0
Max realtime timeout unlimited unlimited usAll the infinity limits should be no problem, because no of my employees can do anything on my machine, except of using the webplayer with preconfigured session-files.
Or do you see any reason not to do that?
Looks good, now I have to wait and see, if all my resource problems are solved.
Maybe you can leave that topic open for some time 🙂Thanks,
Termmachine
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