On 2015-10-23 12:23, Andrei Borzenkov wrote:
23.10.2015 19:02, Chris Bell пишет:
Hi all,
I was wondering, is there any way to create a complete
dependency/ordering map for my entire systemd system?
For starting something "systemd --test" shows all static dependencies
pulled in by startinggiven unit. For stopping something I do not think
something like this exists.
This provides just a ton of information; far more than what I'm looking
for.
Basically, I'd
like to be able to see, relatively clearly, what targets are reached
and
when,
Not sure what "when" means. systemd --test dumps jobs that will be
queued together with dependencies.
Basically in what order are the targets started, and what jobs must
complete before the next target can be started?
what services are wanted/required by the target, and some
That is also shown by "systemctl list-dependencies".
I use this, but I've found that it's best for analyzing a single unit,
not the overall system.
dependencies between services. A way to visualize the chain from
switch-root.target and default.target.
switch-root.target is challenging because when you run it after boot
you have rather different unit definitions. It may be possible to
override it using SYSTEMD_UNIT_PATH but I do not know how to emulate
/run and /etc. Also results of generators that were running in initrd
are no more available.
Doesn't have to be from switch-root; I guess from the first 'real'
target once it leaves the initrd.
I know various functions exist to extract portions of the information
I
need, and they can be used together to get a complete picture, but I
find it difficult to keep everything organized into something
ultimately
useful. Is there a facility I'm missing? Or is this particular ability
too complex to be worth implementing?
To clarify, I'd effectively like to be able to create a visualization of
my boot/init process, in the spirit of how the bootup manpage portrays
the systemd bootup process [0], only with the particulars of my system.
I don't expect it to have the nice graphical flowchart representation,
but some clear representation of that data.
Thanks again!
--Chris
[0] http://www.freedesktop.org/software/systemd/man/bootup.html
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