[systemd-devel] I want to ask you a fundamental question to you about dependency and starting sequence among units.
tonyseo7 at gmail.com
Wed Jul 24 09:15:57 PDT 2013
As I'm a starter in systemd, I want to ask you a fundamental question.
That is how to understand existing relation from dependent and starting
If you check a image file I attached, it' more clear.
Actually, I have studied systemd structure to add my processes in systemd
Although I have read many manpage whicn is on freedesktop.org, I thought
that I might not yet understand dependency and boot sequence among units
after comparing results from systemd-analyze plot and dot tool.
So, I want to get clear conception of dependency and boot sequence.
When I first read a manpage which explains [Unit] option, I find a
For example, I make a "A.service" which has an "Want = B.service".
If A.service is started by systemd, I think that B.service will be started
after A.service is totally completed.
( Is it right to use a words "totally completed to explain execution of
And I'm confused words which explain some parts of "Wants=", I couldn't
understand the expression "start-up".
Does it mean that a unit listed in "Want=" option will be started after
the configuring unit is finished? )
if so, I think this relationship like below
1. B.service is a dependency of A.service.
2. A.service is started before B.service is started in sequential
perspective of boot sequence among units.
3. if B.service is in A.service.want folder, a implicit dependency is made
between A.service and B.service( result will be same as No.1)
In my view, this is a critical time to develop the knowledge of systemd.
I wait someone who explains those things more definite than before.
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