Hello. 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 perspective. If you check a image file I attached, it' more clear. Actually, I have studied systemd structure to add my processes in systemd structure. 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 "Wants=". 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 A.sevice? 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. Thanks Tony Seo
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