Hi All.

We have IPA setup in an AD trust to support our Linux fleet. I’m running into a problem trying to get Ubuntu (16.04) clients to resolve names/ids on an NFS-mounted filesystem from an NFS server using NFSv4/krb5. Files and directories show up as ‘nobody’ or an incorrect numerical ID when listed with ‘ls’. RHEL7 clients seem to working fine with a very similar configuration (as far as I can tell).

The particulars are:

- AD forest has domains ‘localdomain’ and ‘student.localdomain’ (my user identity is ‘user@localdomain’) - IPA domain is ‘ipa.localdomain’ - The NFS server (RHEL7) and clients (Ubu16.04, RHEL7) are both enrolled to IPA (with 'Domain=ipa.localdomain’ in /etc/idmapd.conf).

I have mounted the NFS volume on the clients with a simple:

mount -t nfs4 nfs-server.ipa.localdomain:/export /mnt

Listing my directory as myself (‘rns@localdomain’) on the Ubuntu client, I see:

$ ls -ld rns drwx------ 18 nobody 4294967294 4096 Oct 25 15:18 rns

.. with these corresponding nfsidmap messages:

Oct 25 16:49:42 ubuntu-16.04-client.sub.localdomain nfsidmap[6163]: key: 0x2c254c26 type: uid value: rns@localdomain@ipa.localdomain timeout 600 Oct 25 16:49:42 ubuntu-16.04-client.sub.localdomain nfsidmap[6163]: nfs4_name_to_uid: calling nsswitch->name_to_uid Oct 25 16:49:42 ubuntu-16.04-client.sub.localdomain nfsidmap[6163]: nss_getpwnam: name 'rns@localdomain@ipa.localdomain' domain 'ipa.localdomain': resulting localname '(null)' Oct 25 16:49:42 ubuntu-16.04-client.sub.localdomain nfsidmap[6163]: nss_getpwnam: name 'rns@localdomain@ipa.localdomain' does not map into domain 'ipa.localdomain' Oct 25 16:49:42 ubuntu-16.04-client.sub.localdomain nfsidmap[6163]: nfs4_name_to_uid: nsswitch->name_to_uid returned -22 Oct 25 16:49:42 ubuntu-16.04-client.sub.localdomain nfsidmap[6163]: nfs4_name_to_uid: final return value is -22

.. whereas on the RHEL7 client, I see:

$ ls -ld rns drwx------. 18 rns@localdomain rns@localdomain 4096 Oct 25 15:18 rns

Oct 25 16:56:23 rhel-7-client.sub.localdomain nfsidmap[30590]: key: 0xf113fd2 type: uid value: rns@localdomain@ipa.localdomain timeout 600 Oct 25 16:56:23 rhel-7-client.sub.localdomain nfsidmap[30590]: nfs4_name_to_uid: calling nsswitch->name_to_uid Oct 25 16:56:23 rhel-7-client.sub.localdomain nfsidmap[30590]: nss_getpwnam: name 'rns@localdomain@ipa.localdomain' domain 'ipa.localdomain': resulting localname 'rns@localdomain' Oct 25 16:56:23 rhel-7-client.sub.localdomain nfsidmap[30590]: nfs4_name_to_uid: nsswitch->name_to_uid returned 0 Oct 25 16:56:23 rhel-7-client.sub.localdomain nfsidmap[30590]: nfs4_name_to_uid: final return value is 0 Oct 25 16:56:23 rhel-7-client.sub.localdomain nfsidmap[30592]: key: 0x2125a5d2 type: gid value: rns@localdomain@ipa.localdomain timeout 600 Oct 25 16:56:23 rhel-7-client.sub.localdomain nfsidmap[30592]: nfs4_name_to_gid: calling nsswitch->name_to_gid Oct 25 16:56:23 rhel-7-client.sub.localdomain nfsidmap[30592]: nfs4_name_to_gid: nsswitch->name_to_gid returned 0 Oct 25 16:56:23 rhel-7-client.sub.localdomain nfsidmap[30592]: nfs4_name_to_gid: final return value is 0

Why does the Ubuntu client's nfsidmap think that my identity doesn’t map into ‘ipa.localdomain’ and therefore (presumably) returns the error code ‘-22’?

(My identity resolves ok from the shell, using ‘id rns@localdomain’ and I can login and use local filesystems without issue).

The idmapd.conf looks like this:

[General]

Verbosity = 4 Pipefs-Directory = /run/rpc_pipefs

Domain = ipa.localdomain Local-Realms = LOCALDOMAIN, STUDENT.LOCALDOMAIN, IPA.LOCALDOMAIN

[Mapping]

Nobody-User = nobody Nobody-Group = nogroup

[Translation] Method = nsswitch

Any pointers appreciated!

Regards,

Robert.