[Freeswitch-users] FS priority

Stanislav Sinyagin ssinyagin at gmail.com
Wed Oct 7 15:01:17 MSD 2015 

there is already a pull request that sets already the proper priority

On Wed, Oct 7, 2015 at 9:37 AM, Sergey Safarov <s.safarov at gmail.com> wrote:

> Nice level can be setted in
> - systemd unit file (Nice directive
> http://www.freedesktop.org/software/systemd/man/systemd.exec.html)
> - init.d file (nice command)
>
> I can create pull request for this changes. Can any body say used by FS
> nice level and other priority parameters?
>
> Sergey
>
> On Tue, Oct 6, 2015 at 6:53 AM, Sergey Safarov <s.safarov at gmail.com>
> wrote:
>
>> What is proliority must be used?
>>
>> On Mon, Oct 5, 2015, 21:13 Stanislav Sinyagin <ssinyagin at gmail.com>
>> wrote:
>>
>>> in the current freeswitch.service, freewitch is started under freeswitch
>>> UID, and as a result, it fails to set itself to the proper priority.
>>>
>>> On Mon, Oct 5, 2015 at 7:13 PM, Brian West <brian at freeswitch.org> wrote:
>>>
>>>> "Now the daemon starts as root and switches to freewitch UID." is how
>>>> its always done it.
>>>>
>>>> On Mon, Oct 5, 2015 at 10:27 AM, Stanislav Sinyagin <
>>>> ssinyagin at gmail.com> wrote:
>>>>
>>>>> see
>>>>> https://freeswitch.org/stash/projects/FS/repos/freeswitch/pull-requests/542/overview
>>>>>
>>>>> it was a bit nontrivial because freeswitch.service was installed in an
>>>>> unusual way. Now the daemon starts as root and switches to freewitch UID.
>>>>>
>>>>> Still unresolved is https://freeswitch.org/jira/browse/FS-7937
>>>>> The package installer starts the daemon, but does not enable the
>>>>> service for starting at boot.
>>>>> I will dig into that after the merge.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Sun, Sep 6, 2015 at 6:24 PM, Bote Man <bote_radio at botecomm.com>
>>>>> wrote:
>>>>>
>>>>>> I agree IFF my assumptions and results are applicable to package
>>>>>> installations. If you have a package installation I would prefer that you
>>>>>> verify these results on such an installation since I mostly let my Master
>>>>>> build do what it wants. I always build from Master, never use the packages.
>>>>>>
>>>>>>
>>>>>>
>>>>>> Do we have to specify the –run runtime directory on the FS command
>>>>>> line?
>>>>>>
>>>>>>
>>>>>>
>>>>>> Do we have to specify the –temp files directory?
>>>>>>
>>>>>>
>>>>>>
>>>>>> Right now the unit file for the package specifies none of those so I
>>>>>> don’t know where FS would put its runtime and temp files.
>>>>>>
>>>>>>
>>>>>>
>>>>>> By the way, while testing the location of runtime directory for the
>>>>>> PID file I noted that FS will create the ./run directory with the proper
>>>>>> permissions and owner, then write the PID file in it on its own without
>>>>>> systemd doing it. This happened without specifying anything about that on
>>>>>> the command line and without the tmpfiles.d entry.
>>>>>>
>>>>>>
>>>>>>
>>>>>> But since the .deb package places files in the FHS locations this
>>>>>> would be necessary, so your recent ticket that adds that applies. I omitted
>>>>>> that from my Confluence instructions built from Master, FYI.
>>>>>>
>>>>>>
>>>>>>
>>>>>> Please let me know how to proceed.
>>>>>>
>>>>>>
>>>>>>
>>>>>> Thanks.
>>>>>>
>>>>>>
>>>>>>
>>>>>> Bote
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> *From:* Stanislav Sinyagin
>>>>>> *Sent:* Sunday, 06 September, 2015 06:00
>>>>>>
>>>>>> *Subject:* Re: [Freeswitch-users] FS priority
>>>>>>
>>>>>>
>>>>>>
>>>>>> Looks like another jira ticket is needed for Debian packaging.
>>>>>>
>>>>>> On Sep 6, 2015 6:16 AM, "Anthony Minessale" <
>>>>>> anthony.minessale at gmail.com> wrote:
>>>>>>
>>>>>> It's because FS changes the scheduler and enables some realtime
>>>>>> threads when it can.  If you have multiple cpu np and rp are the same.  FS
>>>>>> always needs root privs to change the platform parameters and nice level
>>>>>> etc.  The scheduler change is not possible if the shell is an unpriveledged
>>>>>> user nor are a bunch of other things unless you carefully allowed them
>>>>>> somehow as root before the shell started.  So basically that is all
>>>>>> expected behavior.
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Saturday, September 5, 2015, Bote Man <bote_radio at botecomm.com>
>>>>>> wrote:
>>>>>>
>>>>>> Sorry, I did not use the utility named ‘runas’ I simply labeled the
>>>>>> column that way and was trying to conserve character space in the header to
>>>>>> get it to fit in a reasonable space.
>>>>>>
>>>>>>
>>>>>>
>>>>>> Anyway, thanks to your post and some research I just changed my  FS
>>>>>> unit file to start FS as user root, but specified –u freeswitch –g
>>>>>> freeswitch on the command line to FS, and changed the
>>>>>> WorkingDirectory=/usr/local/freeswitch/bin (it had been set to ‘run’) and
>>>>>> it’s doing the Right Thing, so that is what I will go with. I vaguely
>>>>>> remember that FS can (should) start as root, then drops privileges to what
>>>>>> is specified on the command line, so it looks like it is doing exactly that.
>>>>>>
>>>>>>
>>>>>>
>>>>>> ‘top’ shows FS running as real and effective user ‘freeswitch’ with
>>>>>> Priority=-2 and Nice=-10 so I am a happy camper.
>>>>>>
>>>>>>
>>>>>>
>>>>>> If nobody on the FS core development team has any objection to this
>>>>>> approach I will update the Confluence page for the systemd unit file for
>>>>>> building from MASTER. The Debian packages have their own file locations.
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> https://freeswitch.org/confluence/display/FREESWITCH/FreeSWITCH+1.6+Video#FreeSWITCH1.6Video-systemd
>>>>>>
>>>>>>
>>>>>>
>>>>>> Any security concerns doing this?
>>>>>>
>>>>>>
>>>>>>
>>>>>> Thanks!
>>>>>>
>>>>>>
>>>>>>
>>>>>> Bote
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> *From:* Shaun Stokes
>>>>>> *Sent:* Saturday, 05 September, 2015 03:18
>>>>>> *Subject:* Re: [Freeswitch-users] FS priority
>>>>>>
>>>>>>
>>>>>>
>>>>>> Are you using FreeSwitch to specify the user to runas or is this
>>>>>> being done by systemd?
>>>>>>
>>>>>>
>>>>>>
>>>>>> In FreeSwitch you use the -u argument to specify the user and the -g
>>>>>> argument to specify the group, if you do this then I assume running the
>>>>>> service as root should be ok providing you've given FreeSwitch an
>>>>>> alternative user and group (in our environment we use the same for user and
>>>>>> group).
>>>>>>
>>>>>>
>>>>>>
>>>>>> Thanks,
>>>>>>
>>>>>> Shaun
>>>>>>
>>>>>>
>>>>>> ------------------------------
>>>>>>
>>>>>> *From:* Bote Man
>>>>>> *Sent:* 05 September 2015 04:28
>>>>>> *Subject:* Re: [Freeswitch-users] FS priority
>>>>>>
>>>>>> I'm not sure how much nice level matters compared to scheduler
>>>>>> priority. I ran a series of tests to find out what Priority and Nice level
>>>>>> are reported by the 'top' utility.
>>>>>>
>>>>>> I ran the first 6 tests by using systemd to start FreeSWITCH, 3 times
>>>>>> as user root with each of the FS priority flags, then 3 times as user
>>>>>> freeswitch with each of the FS flags. Then I repeated that block of tests
>>>>>> from the command line, 3 flags as root, 3 flags as freeswitch. You won't
>>>>>> believe what happened next!
>>>>>>
>>>>>> systemd starting FreeSWITCH as 'RUNAS' user with 'FLAG' command line
>>>>>> priority flags to FS results in top showing priority 'PRI', nice level
>>>>>> 'NICE' on a month-old install of Debian 8 on a bare metal Dell R320 server.
>>>>>>
>>>>>> RUNAS    FLAG    PRI    NICE
>>>>>> root         -rp         -2      -10
>>>>>> root        -np         39      19
>>>>>> root         -lp         39      19
>>>>>>
>>>>>> fs            -rp         -2       19
>>>>>> fs            -np        39      19
>>>>>> fs            -lp         39      19
>>>>>>
>>>>>> Run as root from command line
>>>>>> root         -rp         -2     -10
>>>>>> root         -np        20      0
>>>>>> root         -lp         39     19
>>>>>>
>>>>>> Run as su=freeswitch from command line
>>>>>> fs            -rp        20      0
>>>>>> fs            -np       20      0
>>>>>> fs            -lp        39     19
>>>>>>
>>>>>> Most processes show Priority of 20 so I assume that is considered
>>>>>> "normal".
>>>>>>
>>>>>> So it looks like the only way to get truly higher priority for a
>>>>>> process is to run it as root, which I expected. Once the scheduler priority
>>>>>> is at -2 (higher priority) I don't know whether the nice level even matters.
>>>>>>
>>>>>> For now, the systemd unit file that I posted on Confluence runs as
>>>>>> the freeswitch user so even with the -rp flag to FreeSWITCH it gets niced
>>>>>> down to 19 which is the lowest level available for nice. Does this matter?
>>>>>>
>>>>>> Is there a serious security concern running FreeSWITCH as root?
>>>>>>
>>>>>> Thanks.
>>>>>>
>>>>>> Bote
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Fri, Sep 4, 2015 at 3:38 PM, Bote Man <bote_radio at botecomm.com>
>>>>>> wrote:
>>>>>>
>>>>>> Thanks for that. I was under the impression that systemd was throwing
>>>>>> FreeSWITCH into the generic scheduling group and starving it of resources
>>>>>> as a result, but when I manually ran ./freeswitch as root it still showed
>>>>>> the same values.
>>>>>>
>>>>>> Running FS manually with -np yielded pri=20 nice=0 and System Monitor
>>>>>> reports priority "normal"
>>>>>>
>>>>>> Running FS manually with -rp yielded pri=-2 nice=-10 and System
>>>>>> Monitor reports priority "very high", same results as when FS was started
>>>>>> without any priority switch on the command line.
>>>>>>
>>>>>> BUT! When I start FS with systemd it maintains priority=-2 but nice
>>>>>> all the way down to 19 which is why System Monitor reports "very low". This
>>>>>> happens even with the -rp switch specified in the unit file.
>>>>>>
>>>>>> I don't know how scheduling priority and nice level interact on
>>>>>> Debian, but it looks like I have a new research project for this weekend,
>>>>>> assuming this is truly something to be concerned about. Or is it?
>>>>>>
>>>>>> Thanks for the tips. I will report my findings to the list if I
>>>>>> discover anything substantive.
>>>>>>
>>>>>> Bote
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Fri, Sep 4, 2015 at 2:02 PM, Shaun Stokes <
>>>>>> shaun.stokes at itec-support.co.uk> wrote:
>>>>>>
>>>>>> Hi Bote,
>>>>>>
>>>>>>
>>>>>>
>>>>>> I believe priority works in a similar way to metric (i.e. lower comes
>>>>>> first), so -20 (most favorable scheduling) to +19 (least favorable
>>>>>> scheduling).
>>>>>>
>>>>>>
>>>>>>
>>>>>> -rp                    -- enable high(realtime) priority settings
>>>>>>
>>>>>> -lp                    -- enable low priority settings
>>>>>>
>>>>>> -np                    -- enable normal priority settings (system default)
>>>>>>
>>>>>> Source: https://wiki.freeswitch.org/wiki/Command_line
>>>>>>
>>>>>>
>>>>>>
>>>>>> Hope this helps.
>>>>>>
>>>>>>
>>>>>>
>>>>>> Thanks,
>>>>>>
>>>>>> Shaun
>>>>>> ------------------------------
>>>>>>
>>>>>> *From:* freeswitch-users-bounces at lists.freeswitch.org [
>>>>>> freeswitch-users-bounces at lists.freeswitch.org] on behalf of Bote Man
>>>>>> [bote_radio at botecomm.com]
>>>>>> *Sent:* 04 September 2015 15:54
>>>>>> *To:* FreeSWITCH Users Help
>>>>>> *Subject:* [Freeswitch-users] FS priority
>>>>>>
>>>>>> I’m trying to set the priority on a new FreeSWITCH installation built
>>>>>> from master on Debian 8 running on bare metal. It is currently running at
>>>>>> “very low” priority according to Resource Monitor in the GUI and ‘top’
>>>>>> reports FS is running at priority = -2 (that’s negative two) and nice = 19
>>>>>>
>>>>>> So with the way FreeSWITCH is now launched by systemd is it
>>>>>> considered a service or a user application that is simply run in the
>>>>>> background?
>>>>>>
>>>>>> This affects how systemd treats its control groups and priority and
>>>>>> how I will go about troubleshooting this.
>>>>>>
>>>>>>
>>>>>> Thanks.
>>>>>>
>>>>>>
>>>>>>
>>>>>> Bote
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>>
>>>>>> Anthony Minessale II       ♬ @anthmfs  ♬ @FreeSWITCH  ♬
>>>>>>
>>>>>>
>>>>>>
>>>>>> ☞ http://freeswitch.org/  ☞ http://cluecon.com/  ☞
>>>>>> http://twitter.com/FreeSWITCH
>>>>>>
>>>>>> ☞ irc.freenode.net #freeswitch ☞ *http://freeswitch.org/g+
>>>>>> <http://freeswitch.org/g+>*
>>>>>>
>>>>>> ClueCon Weekly Development Call
>>>>>>
>>>>>> ☎ sip:888 at conference.freeswitch.org  ☎ +19193869900
>>>>>>
>>>>>>
>>>>>>
>>>>>> https://www.youtube.com/watch?v=9XXgW34t40s
>>>>>>
>>>>>> https://www.youtube.com/watch?v=NLaDpGQuZDA
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> _________________________________________________________________________
>>>>>> Professional FreeSWITCH Consulting Services:
>>>>>> consulting at freeswitch.org
>>>>>> http://www.freeswitchsolutions.com
>>>>>>
>>>>>> Official FreeSWITCH Sites
>>>>>> http://www.freeswitch.org
>>>>>> http://confluence.freeswitch.org
>>>>>> http://www.cluecon.com
>>>>>>
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>>>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>>>>> UNSUBSCRIBE:
>>>>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
>>>>>> http://www.freeswitch.org
>>>>>>
>>>>>>
>>>>>> _________________________________________________________________________
>>>>>> Professional FreeSWITCH Consulting Services:
>>>>>> consulting at freeswitch.org
>>>>>> http://www.freeswitchsolutions.com
>>>>>>
>>>>>> Official FreeSWITCH Sites
>>>>>> http://www.freeswitch.org
>>>>>> http://confluence.freeswitch.org
>>>>>> http://www.cluecon.com
>>>>>>
>>>>>> FreeSWITCH-users mailing list
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>>>>>> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>>>>>> UNSUBSCRIBE:
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>>>>>> http://www.freeswitch.org
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> _________________________________________________________________________
>>>>> Professional FreeSWITCH Consulting Services:
>>>>> consulting at freeswitch.org
>>>>> http://www.freeswitchsolutions.com
>>>>>
>>>>> Official FreeSWITCH Sites
>>>>> http://www.freeswitch.org
>>>>> http://confluence.freeswitch.org
>>>>> http://www.cluecon.com
>>>>>
>>>>> FreeSWITCH-users mailing list
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>>>>> UNSUBSCRIBE:
>>>>> http://lists.freeswitch.org/mailman/options/freeswitch-users
>>>>> http://www.freeswitch.org
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>>
>>>> *Brian West*
>>>> brian at freeswitch.org
>>>>
>>>>
>>>> *Twitter: @FreeSWITCH , @briankwest*
>>>> http://www.freeswitchbook.com
>>>> http://www.freeswitchcookbook.com
>>>>
>>>> Got Bugs? Report them here <https://freeswitch.org/jira>! | Reddit:
>>>> /r/freeswitch <https://www.reddit.com/r/freeswitch>
>>>>
>>>> *T:*+19184209001 | *F:*+19184209002 | *M:*+1918424WEST (9378)
>>>> *iNUM:*+883 5100 1420 9001 | *ISN:*410*543 | *Skype:*briankwest
>>>>
>>>>
>>>> _________________________________________________________________________
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>>>> http://www.freeswitchsolutions.com
>>>>
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>>>> http://www.freeswitch.org
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>>>> http://www.cluecon.com
>>>>
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>>>>
>>>
>>> _________________________________________________________________________
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>>> http://www.freeswitchsolutions.com
>>>
>>> Official FreeSWITCH Sites
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>>>
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>>
>>
>
> _________________________________________________________________________
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> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
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>
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