[Box-Admins] Re: [squeak-dev] cogspurlinuxht under daemontools

Eliot Miranda eliot.miranda at gmail.com
Thu Jul 16 18:52:05 UTC 2015


   can you confirm?  If it does, I'll add it to the relevant readmes.

On Thu, Jul 16, 2015 at 11:39 AM, Levente Uzonyi <leves at elte.hu> wrote:

> This should work, because the daemontools start script is executed by
> root. I assume that it's enough to the highest priority to 2, so the
> following should work:
> ulimit -r 2
> exec setuidgid <account> <ht_vm_executable> <image> ...
> Levente
> On Wed, 15 Jul 2015, Eliot Miranda wrote:
>  Hi Chris,
>> On Wed, Jul 15, 2015 at 9:17 AM, Chris Muller <ma.chris.m at gmail.com>
>> wrote:
>>       On Sat, Jul 11, 2015 at 4:30 PM, Eliot Miranda <
>> eliot.miranda at gmail.com> wrote:
>>       > Hi Chris,
>>       >
>>       >     I really know very little about this.  I don't understand the
>> mechanism.  But I'm told that the limits file takes effect on login.  i.e.
>> if the file is created while a user is logged in it
>>       won't take effect for that user until that user logs out and logs
>> back in again and only applies to those sessions that logged in once the
>> file had been created.  I /dont/ know whether su sets up
>>       a new session.  i should try that experiment.
>>       >
>>       > So perhaps you could have daemon tools run login or su to create
>> a new session and see if the ht version can be run by daemontools in that
>> session.  Presumably daemons launched at boot aren't in
>>       the right state.  (What an absurdity they've invented here).
>>       Good suggestion to try, unfortunately it didn't work.  I tried
>> logging
>>       in as root to see if it would "initialize" that account to have
>> those
>>       permissions, then logging out and starting the daemon.  Same error.
>> See
>> http://superuser.com/questions/454465/make-ulimits-work-with-start-stop-daemon.
>> Apparently
>> "At this time, you can't. limits.conf(5) is the configuration
>> for pam_limits(8), which is activated by the PAM stack according to the
>> configuration in /etc/pam.d. However, start-stop-daemon(8) as launched
>> from an init.d script doesn't pass through the PAM stack, so those kinds
>> of settings are never applied.
>> Debian bug #302079 contains a patch to enable setting limits
>> from start-stop-daemon(8), but the bug has been open since 2005 and the
>> patch hasn't been merged yet.
>> While not ideal, AFAIK the recommended way to accomplish this right now
>> is to add a ulimitcall in your init.d script."
>> Looks like this is settable via ulimit -r; From man ulimit(1) (actually
>> from bash (1))
>>               -r     The maximum real-time scheduling priority
>> Of course this may not work:
>> ulimit -r 3$
>> -bash: ulimit: real-time priority: cannot modify limit: Operation not
>> permitted
>> But it's worth a try.
>>       For the sake of progress, I've switched to using the ITHB vm.
>> --
>> best,Eliot

best, Eliot
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