[SSSD-users] Caching of automount maps
I'm trying to better understand how sssd caches automount maps. I've
had everything working for quite some time; autofs will get the maps
(which are stored in ldap) from sssd when the system boots and in
general there are no issues. However, there are a couple of problems
I've been having:
* Autofs is mostly nonfunctional When a system boots without the network.
* Even with a network, autofs sometimes simply fails to start with:
automount[917]: setautomntent: lookup(sss): setautomntent: No such
file or directory
---
With no network, autofs starts but the only thing which operates is the
/net map because that's in /etc/auto.master. The rest of the maps
simply aren't there, and if the network returns, autofs doesn't notice
(which I know is an issue with autofs).
I thought that sssd would be able to cache the master map entries which
come from ldap when the network is offline, but that doesn't seem to be
the case. I know that it couldn't actually mount anything, but if it at
had access to a cached version the map, it would at least start properly.
---
The startup failure is rather difficult to reproduce. My guess is that
autofs is simply coming up before sssd is ready to provide the master
map, but I haven't been able to confirm that. I also haven't been able
to see how much of autofs is actually functioning in that case (because
people keep rebooting their desktops before I can examine one in
detail).
---
By skipping ldap and storing the entire master map in /etc/auto.master,
everything seems to work better. At least, the first problem goes away
entirely, and I haven't yet been able to reproduce the second problem.
With a local auto.master and no network, autofs starts up OK but
automount -m shows no data at all for the maps. This also surprises me
because I figured they'd be cached. As soon as the network returns the
maps appear.
Is this the normal behavior? Am I expecting sssd to cache things it
isn't supposed to be caching?
- J<