[systemd-devel] controlling IO from a transient service

[jsl6uy js16uy]

That definitely did the trick
I am creating/testing local qemu-based vagrant images. Very Nice not to
have my host and ssd crushed every time I add boxes to vagrant!
thanks very much again sir much appreciated

On Wed, Jun 29, 2016 at 4:55 PM, jsl6uy js16uy <js16uy at gmail.com> wrote:

> Did NOT even consider the consequence of the su. been pounding the head.
> Thanks very much sir!
> will try as you recommend and report back
>
> best regards
>
> On Wed, Jun 29, 2016 at 4:00 PM, Lennart Poettering <
> lennart at poettering.net> wrote:
>
>> On Tue, 28.06.16 11:20, jsl6uy js16uy (js16uy at gmail.com) wrote:
>>
>> > Hello all, hope all is well
>> >
>> > Should I be able to control the IO for a tar process?
>> >
>> > I am on arch linux using systemd-run to initiate a service to which I
>> can
>> > apply resource limits
>> >
>> > Linux 4.6.2-1-ARCH #1 SMP PREEMPT Wed Jun 8 08:40:59 CEST 2016 x86_64
>> > GNU/Linux
>> >
>> >  systemctl --version
>> > systemd 230
>> > +PAM -AUDIT -SELINUX -IMA -APPARMOR +SMACK -SYSVINIT +UTMP
>> +LIBCRYPTSETUP
>> > +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD +IDN
>> >
>> >
>> > I am starting a transient service with the parameters below. I have
>> tried
>> > several combinations
>> >
>> > sudo systemd-run --unit=loadio -p "BlockIOWriteBandwidth=/dev/dm-1 50M"
>> --
>> > su - foo -c "cd $PWD && tar vcf custom_box.box ./metadata.json
>> > ./Vagrantfile ./box.img"
>>
>> So this creates a transient service unit, and then runs "su" inside of
>> it, which will create a separate transient scope unit for the login
>> session "su" creates.
>>
>> Or in other words: you actually create a the unit correctly, but then
>> immediately escape it again for the actual command you want to run.
>>
>> Consider using the "User=" property instead of "su". "User=" does not
>> involve PAM and hence does not result in creation of a new user login
>> session.
>>
>> Lennart
>>
>> --
>> Lennart Poettering, Red Hat
>>
>
>
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