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Lord Bo

Member

Registered: 2012-11-11

Posts: 168

[DONE] NFS with idmap

Dear Archers,

I am currently trying to setup an NFS share with ID mapping from a user named "child" on the host (uid=1003) to a user named "ben" on the client (uid=1000). But I cannot manage to make the idmap work.

Here is what i configured on the server:

/etc/exports

/srv/nfs             192.168.2.0/24(rw,sync,no_subtree_check,crossmnt,fsid=0)
/srv/nfs/media  192.168.2.0/24(rw,sync,no_subtree_check,no_root_squash)

ls -lah /srv/nfs/

drwxr-xr-x 3 root  root  4.0K Apr 24 06:53 .
drwxr-xr-x 5 root  root  4.0K Apr 24 06:53 ..
drwxr-xr-x 2 child child 4.0K Apr 24 08:33 media

systemctl status nfs-server.service

* nfs-server.service - NFS server and services
   Loaded: loaded (/usr/lib/systemd/system/nfs-server.service; disabled; vendor preset: disabled)
   Active: active (exited) since Wed 2019-04-24 09:29:18 CEST; 4min 39s ago
  Process: 6634 ExecStartPre=/usr/sbin/exportfs -r (code=exited, status=0/SUCCESS)
  Process: 6635 ExecStart=/usr/sbin/rpc.nfsd (code=exited, status=0/SUCCESS)
 Main PID: 6635 (code=exited, status=0/SUCCESS)
    Tasks: 0 (limit: 1599)
   CGroup: /system.slice/nfs-server.service

Apr 24 09:29:18 crumb systemd[1]: Starting NFS server and services...
Apr 24 09:29:18 crumb systemd[1]: Started NFS server and services.

systemctl status nfs-idmapd.service

* nfs-idmapd.service - NFSv4 ID-name mapping service
   Loaded: loaded (/usr/lib/systemd/system/nfs-idmapd.service; static; vendor preset: disabled)
   Active: active (running) since Wed 2019-04-24 09:29:34 CEST; 5min ago
  Process: 6652 ExecStart=/usr/sbin/rpc.idmapd (code=exited, status=0/SUCCESS)
 Main PID: 6653 (rpc.idmapd)
    Tasks: 1 (limit: 1599)
   CGroup: /system.slice/nfs-idmapd.service
           `-6653 /usr/sbin/rpc.idmapd

Apr 24 09:29:34 crumb systemd[1]: Starting NFSv4 ID-name mapping service...
Apr 24 09:29:34 crumb rpc.idmapd[6653]: Setting log level to 0
Apr 24 09:29:34 crumb systemd[1]: Started NFSv4 ID-name mapping service.

cat /sys/module/nfsd/parameters/nfs4_disable_idmapping (same on client)

N

/etc/idmapd.conf (same on client)

[General]
Domain = crumb # my hostname
[UMICH_SCHEMA]

# server information (REQUIRED)
LDAP_server = ldap-server.local.domain.edu

# the default search base (REQUIRED)
LDAP_base = dc=local,dc=domain,dc=edu

On the client (except for identical configuration already mentioned for server):
systemctl status nfs-client.target

● nfs-client.target - NFS client services
   Loaded: loaded (/usr/lib/systemd/system/nfs-client.target; disabled; vendor preset: disabled)
   Active: active since Wed 2019-04-24 09:30:05 CEST; 12min ago

Apr 24 09:30:05 blackfly systemd[1]: Reached target NFS client services.

/etc/fstab

crumb:/srv/nfs/media /mnt/media nfs noauto,x-systemd.automount,x-systemd.device-timeout=10,timeo=5,x-systemd.idle-timeout=1min,users 0 0
crumb:/srv/nfs/media   /mnt/media_2   nfs   noauto,defaults,rsize=32768,wsize=32768,timeo=900,retrans=5,_netdev,users,rw	0 0

However when mounting /mnt/media or /mnt/media_2 I get:
ls -lah

drwxr-xr-x  4 ben  ben  4,0K 24. Apr 08:21 .
drwxr-xr-x 13 ben  ben  4,0K 24. Apr 07:14 ..
drwxr-xr-x  2 1003 1003 4,0K 24. Apr 08:33 media
drwxr-xr-x  2 1003 1003 4,0K 24. Apr 08:33 media_2

So idmap is not working. I hope for your advice.

Last edited by Lord Bo (2019-05-08 04:26:32)

Lord Bo

Member

Registered: 2012-11-11

Posts: 168

Re: [DONE] NFS with idmap

Since no one can answer and I found another file sharing solution, I will mark this thread as done and concentrate on other things.