[TriLUG] NFS and idmapd

[Jimmy Dorff via TriLUG]

You need to have the domain matching on both the NFSv4 server and NFSv4 
client.

$ head /etc/idmapd.conf
[General]
#Verbosity = 0
# The following should be set to the local NFSv4 domain name
# The default is the host's DNS domain name.
Domain = foo.bar.org

Under CentOS, you will want to restart and nfs-idmapd.service after any 
changes.


On 12/30/16 2:53 PM, Brian via TriLUG wrote:
> Hi y'all,
>
> As I gradually reinstate the less-critical services of the server I
> rebuilt with CentOS 7 recently, I was hoping to eschew samba in favor of
> NFS for sharing between Linux hosts.  Problem is, I can't get id mapping
> to work.  I'm certain I'm just missing some critical piece or getting
> the order of operations wrong, but here's what's going on:
>
> - Server: CentOS 7.  User "brian"'s id is 500
> - Client: Debian Jessie (8.4).  User "brian"'s id is 1000
>
> I can mount the NFS export on the client, but the id mapping isn't
> happening; when I do an "ls -l" I see "500 500" as the ownership instead
> of "brian brian"
>
> I've been googling around and what I've read so far is that if the
> services are configured correctly, name-to-id mapping should happen sort
> of automagically.  I've done:
>
> echo N > /sys/module/nfs[d]/parameters/nfs4_disable_idmapping
>
> on both client and server (server with "d" in path, client without)
>
> I've done nfsidmap -c on both sides
>
> Obviously I'm missing something...but what?
>
> Thanks in advance,
> -Brian