Re: libinit idea

From: OutBackDingo <outbackdingo_at_gmail.com>
Date: Sun, 23 Feb 2014 14:31:39 -0500
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On 02/23/2014 02:09 PM, Nikolai Lifanov wrote:
> On 2014-02-23 13:47, David Chisnall wrote:
>> On 23 Feb 2014, at 18:31, Freddie Cash <fjwcash_at_gmail.com>
>> wrote:
>> 
>>> The main developer for systemd is very anti-portability and 
>>> anti-!Linux. He had actively rejected patches that made his
>>> projects work on non-Linux systems. In order to port systemd to
>>> a non-Linux system, he wants you to first implement every Linux
>>> feature that systemd uses.
>>> 
>>> systemd is a non-starter, and not with considering.
>> 
>> I don't think that's a relevant discussion.  The license would
>> likely preclude systemd from making it into the base system
>> anyway.  Please let's not be too negative about the author of
>> systemd: he's responsible for more people switching from Linux to
>> FreeBSD than any other single individual I can think of and I
>> would strongly encourage him to continue.
>> 
> 
> I also noticed this.
> 
>> The relevant question is whether it does anything in a way that
>> is sufficiently sensible to merit a FreeBSD service management 
>> infrastructure doing it in the same (or a similar) way.
>> 
>> Oh, two things missing from my original list:
>> 
>> - Service jails should be able to run without an init process,
>> with just the required libraries installed and the host machine's
>> init system starting the jail and the service process(es) inside
>> it.
>> 
> 
> Isn't this a bit too complicated? If there is an init script under 
> $jail/usr/local/etc/rc.d, then the host init will need to find it,
> which can be even more complicated if rc search path in the jail is
> customized (prefixed if it's managed by a different department, for
> example). Host init will have to read the jail configuration, parse
> it too, and then manage children and pids of the jailed services,
> including reparenting, all within a jail context. Then the admin in
> that jail would need to be able to restart services, affecting host
> init, which opens a whole new can of worms. If init program is
> skinny and not too complicated, which it is, there is no tangible
> overhead. And if a jail really needs a single simple service, init
> process in the jail can *be* that, like jexec myjail /bin/sh -c
> somestuff (or even /usr/local/bin/myservice -c myservice conf).
> 
>> - The init system should use process descriptors, not pids, for 
>> tracking processes, preventing issues with pid reuse and so on
>> (and removing the need to write pid files).  If process
>> descriptors do not provide the required functionality (e.g. the
>> ability to trace forked children) then this should be added.
>> 
> 
> This is a good idea.
> 
>> David

openrc already does this and runs on FreeBSD, ive been using it on 5
boxes in testing so far, clealy replaces init without breaking rc.conf
configurations.

>> 
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Received on Sun Feb 23 2014 - 18:31:42 UTC

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