[systemd-devel] Create a target unit to start & stop a group of services

[林自均]

Anyone?

John Lin

林自均 <johnlinp at gmail.com> 於 2018年2月27日 週二 下午6:20寫道：

> Hi Jérémy,
>
> Thank you, but I read the section "Mapping of unit properties to their
> inverses" in the man page
> https://www.freedesktop.org/software/systemd/man/systemd.unit.html and
> then found out the PropagatesReloadTo= and ReloadPropagatedFrom= are
> inverses to each other and both can be configured in a unit file. I was
> wondering why PartOf= and ConsistsOf= are not the case. Thank you.
>
> John Lin
>
>
> Jérémy Rosen <jeremy.rosen at smile.fr> 於 2018年2月27日 週二 下午4:35寫道：
>
>>
>>
>> On 27/02/2018 02:49, 林自均 wrote:
>>
>> Hi both Michal,
>>
>> Thank you for the quick responses! I think I will keep on using the tedious
>> PartOf= directive.
>>
>> However, may I ask why ConsistsOf= is readonly? If I can use it in my
>> "my-apps.target", that would be great.
>>
>> Because "ConsistsOf" doesn't exist in the way you think it does...
>>
>> Every relation between units (Wants, Before, PartOf) needs to have an
>> internal, reverse relation for accounting purpose
>>
>> That reverse relation is usually an internal detail, but it is handy to
>> expose
>> it in "systemctl show" & co.
>>
>> So that's what you see, an internal property exposed for ease-of-use. not
>> an
>> external, user configurable property
>>
>>
>>
>> John Lin
>>
>> Michal Koutný <mkoutny at suse.com> <mkoutny at suse.com> 於 2018年2月26日 週一 下午7:28寫道：
>>
>>
>>
>>
>> On 02/26/2018 11:08 AM, Michal Sekletar wrote:
>>
>> Unfortunately, we don't have a dependency (AFAIK) that only propagates
>> stop actions.
>>
>> FTR (not helpful for the original problem), there exists ConsistsOf= as
>> an inverse of PartOf= dependency. However, it's read only currently (or
>> strictly speaking, writable through the PartOf= endpoint).
>>
>> Michal
>>
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