How to determine which daemons are active at Ubuntu boot time before the systemd-logind.service daemon is executed and does not depend on the systemd-logind.service daemon?
I don't get an answer from strace and journalctl software. I want to find the Dependencies of daemons with systemd-logind.service.
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I have been following these instructions for some time, but it is not really clear (it answer is complicated).
I can't clearly get the dependencies of service or daemon For example: systemctl list-dependencies systemd-logind.service --before systemctl list-dependencies systemd-logind.service --after
With these methods, it is not possible to find only the dependencies of a service, because the execution of services at the same time in parallel does through (systemd is a system and service manager ).
It is not at all possible to clearly follow and understand the dependencies of a service. it is hard.
Even, for example, we want to see what steps and calls the executed or called service has with commands: (strace -e trace=signal ping 8.8.8.8 -c 4). Again, there is no indication of services and daemons that issue functionality.
This website gives some pointers. https://insujang.github.io/2018-11-22/systemd-boot-process/
But if we try to narrow it down, it gets more confusing.
