[Freeswitch-users] FS priority
Stanislav Sinyagin
ssinyagin at gmail.com
Mon Oct 5 22:12:16 MSD 2015
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
>>>
>>>
>>>
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>>
>>
>> _________________________________________________________________________
>> 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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>>
>
>
>
> --
>
> *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:
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>
> *T:*+19184209001 | *F:*+19184209002 | *M:*+1918424WEST (9378)
> *iNUM:*+883 5100 1420 9001 | *ISN:*410*543 | *Skype:*briankwest
>
> _________________________________________________________________________
> Professional FreeSWITCH Consulting Services:
> consulting at freeswitch.org
> http://www.freeswitchsolutions.com
>
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> http://www.cluecon.com
>
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