Stephen Morris writes:
Hi Sam,I don't know anything about Systemd, nor have I read the rest of the responses to this, but just looking at the logical interpretation of your named-chroot.service statements it seems to me that you are requesting that
Well, technically it's not "my" named-chroot.service. This is the standard named-chroot RPM's service file, that it installs. You do a "yum install bind-chroot", that's what you'll end up getting installed.
named-chroot.service be started after network.target but before nss- lookup.target and that it needs nss-lookup.target to be active, which to me seems to be a deadly embrace. Based on what I think you are saying in your email I would have thought that logically your "before" statement should be removed and your "after" statement should be after network.target network-online.target nss-lookup.target , but then I am not sure how systemd works.
Don't feel bad about not knowing how systemd works. You're in good company.named-chroot.service wants to be started before nss-lookup.target because bind's mission in life is to provide host/IP lookups, and everything that requires working host/IP lookup, according to systemd.special(7), specifies itself to be after nss-lookup.target; so if bind is going to provide host/IP lookup, it needs to come up first. That makes logical sense.
But systemd's entire dependency model is headache-inducing. It naturally leads to impossible situations. More than once, I observed systemd spewing errors about circular dependencies, at system boot.
Oy, what a mess. At least today, with invaluable help from fellow sufferers, I think finally figured out what's wrong with the stock service files installed by a bunch of server RPMs, and how to work around it.
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