Simple display of systemd service sequence

charlweed · #1 13th July 2011, 01:09 AM

Hi,
What's the best way to get a list of the start order of services from systemd?
Yes, I've tried

Code:

systemctl --order

This looks like the output I would expect, except that if that list is the system service start order, then my system is hosed. I certainly hope that my system is not starting nfs service before all the /usr/export filesystems are mounted.
I tried

Code:

systemd --test --system

but that generates over 22 thousand lines of gibberish! I filtered that with

Code:

 systemd --test --system | grep -- -\> | grep Unit | grep -i service

And it's less gibberish, but it's ALMOST the reverse order of the first command, and still pretty crazy.

Ultimately, I need to discover, and fix the order of the services started by systemd, because they were mangled during the upgrade from Fedora 14

I hope that "systemctl --order" is either not the real deal, or I'm reading it wrong. Because if it is, I'm afraid I have a huge problem to fix.

dd_wizard · #2 13th July 2011, 02:46 AM

From reading the man pages, your second try is the one you want. The Job XXX seems to indicate the order the units are started. Using --order just says to build the digraph with only before/after dependencies. Check out the dot section of the systemctl man page.

dd_wizard

charlweed · #3 13th July 2011, 05:34 AM

Oh...Kay... from the man page of systemctl:

Code:

dot  Generate textual dependency graph description in dot format for further processing with the GraphViz dot(1) tool. Use a command line like systemctl dot | dot -Tsvg > systemd.svg to generate a graphical dependency tree. Unless --order or --require is passed the generated graph will show both
           ordering and requirement dependencies

I tried a few commands, got failures. Whatever.

Code:

systemctl --order dot

Generates 1655 lines of output as a response. Tomorrow, I will go through it all. But right now, it seems crystal that systemd should NOT be in any default "set" as an upgrade from a previous release Fedora. The system breaks, and fails multiple acceptability criteria.
Over an hour of Googling, and two of reading the Wikkis, yields no answers for stabilizing a system to a coherent boot sequence when services were based on SysV.
So here is an alert:
DON"T Do It! Do NOT upgrade From Fedora 14 to Fedora 15!
Just install a new system!