This is a followup to a previous post I made.
With Frank Filz’s helpful suggestions I was able to gather better data.
problem: when using chown as root on a nfs4 filesystem on newer linux releases file owners get sets to nobody.
the user type doesn’t seem to matter (/etc/passwd, LDAP, Samba4)
setup: Server is FreeBSD 10 system with NFSv4 share.
Server and clients are all configured with the same idmap domain
Network users have consistent uid/gid on server and clients
clients with older linux releases work OK (Ubuntu 12.04, CentOS 5 and 6)
clients with newer linux releases do not work ( Fedora 20, Ubuntu 14.04, Mint 16 )
clues:
1. working and non-working systems get to the same fchownat() system call with the same arguments (via strace).
example (identical on working and non-working client):
...
fchownat(AT_FDCWD, "/mnt/test", 11111, 4294967295, 0) = 0
close(1) = 0
close(2) = 0
close(4) = 0
exit_group(0) = ?
+++ exited with 0 +++
2. working system sends NFSV4 SETATTR request with owner set to: matlab@xxxxxxxxx and non-working as 11111 (via wireshark)
Attachment:
broken.cap
Description: application/vnd.tcpdump.pcap
Attachment:
working.cap
Description: application/vnd.tcpdump.pcap
3. I can’t rule out misconfiguration. but I’ve configured as identically as I could, and tried a lot of small vairations. these are my current settings (the pipefs setting is the distro default)
Attachment:
broken.idmapd.conf
Description: Binary data
Attachment:
working.idmap.conf
Description: Binary data
