I understand sssd is failing to start because there is no config, but
I'm trying to understand the bad interaction of automounts with sssd,
which would be via /etc/nsswitch.conf.
(Brainstorming below, pardon me if this is all obvious to you)
autofs will consult /etc/nsswitch.conf when a map file has no path,
i.e., is not really a file.
Something like this in /etc/auto.master:
/mnt auto.mnt
Since it's "auto.mnt" and not, say, "/etc/auto.mnt", /etc/nsswitch.conf
is consulted.
That is exactly the case that was reported in this bug. Recaping:
"""
>From /etc/auto.master:
/mnt/GGData auto.DataVol1 --ghost
"""
I'm not sure what is the fallback when NSS returns "sorry, no such thing
here". Does autofs assumes a file, with a certain path? Let's find out.
...
Ok, it fails miserably. But if I remove "automount: sss" from
/etc/nsswitch.conf, and leave the map without an absolute path, then
autofs works.
I see two options here:
a) /etc/nsswitch.conf change
a) Add files:
automount: sss files
Also files could be first. Some experimentation and thought required here. We
can also play with flags, like:
automount: sss [NOTFOUND=continue] files
The nsswitch.conf(5) manpage documents these. A quick check in our
default nsswitch.conf file shows we (debian/ubuntu) do not use these
flags. I seem to remember that Redhat/Fedora used to play a lot with the
flags.
b) use a path in auto.master. In other words, change your
/etc/auto.master entry to:
/mnt/GGData /etc/auto.DataVol1 --ghost
Or wherever auto.DataVol1 exists.
I have a feeling your setup was relying on this fallback to assuming the
location of the auto.DataVol1 file.
strace shows autofs assumes /etc in this case, as the path for the file:
4263 connect(9, {sa_family=AF_UNIX, sun_path="/var/lib/sss/pipes/autofs"},
110) = -1 ENOENT (No such file or directory)
4263 close(9) = 0
4263 write(2, "setautomntent: lookup(sss): setautomntent: No such file or
directory", 68) = 68
4263 write(2, "\n", 1) = 1
4263 write(2, "lookup_nss_read_map: reading map files auto.mnt", 47) = 47
4263 write(2, "\n", 1) = 1
4263 stat("/etc/auto.mnt", {st_mode=S_IFREG|0644, st_size=330, ...}) = 0
So, here is my take: I believe your configuration needs to be fixed, because
using a map file without a path in /etc/auto.master is documented as doing an
nsswitch lookup, which is what broke when libnss-sss was installed (due to the
entry it adds to /etc/nsswitch.fong).
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https://bugs.launchpad.net/bugs/1897153
Title:
Automount fails due to SSSD config (Groovy Gorilla)
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