09-29-2017
When you use the showmount command you are implicitly stating that you use NFSv3, so just to clarify: you do use NFSv3, yes?
For the outside chance you don't: you need to have the "NFS domain" on server and client set to the same value. You do that in /etc/idmapd.conf. My suggestion is to use the same value as for the DNS domain, but it can have any value in fact.
Also check if the non-working systems have the right (=corresponding) services started, because NFSv3 and NFSv4 use completely different daemons.
I hope this helps.
bakunin
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rpc.idmapd
RPC.IDMAPD(8) BSD System Manager's Manual RPC.IDMAPD(8)
NAME
rpc.idmapd -- NFSv4 ID <-> Name Mapper
SYNOPSIS
rpc.idmapd [-v] [-f] [-d domain] [-p path] [-U username] [-G groupname] [-c path]
DESCRIPTION
rpc.idmapd is the NFSv4 ID <-> name mapping daemon. It provides functionality to the NFSv4 kernel client and server, to which it communi-
cates via upcalls, by translating user and group IDs to names, and vice versa.
The options are as follows:
-v Increases the verbosity level (can be specified multiple times).
-f Runs rpc.idmapd in the foreground and prints all output to the terminal.
-d domain Set domain to domain. This is used internally by NFSv4 and is typically assigned by the system administrator. By default,
domain is set to be the FQDN of the host, minus the hostname.
-p path Specifies the location of the RPC pipefs to be path. The default value is "/var/lib/nfs/rpc_pipefs".
-U username Specifies the NFSv4 nobody user to be username. The default value is "nobody".
-G groupname
Specifies the NFSv4 nobody group to be groupname. The default value is "nobody".
-c path Use configuration file path.
-C Client-only: perform no idmapping for any NFS server, even if one is detected.
-S Server-only: perform no idmapping for any NFS client, even if one is detected.
EXAMPLES
rpc.idmapd -d "citi.umich.edu" -f -vvv
Runs rpc.idmapd with the domain "citi.umich.edu" in the foreground, printing all messages to console, and with a verbosity level of 3.
FILES
/etc/idmapd.conf
SEE ALSO
idmapd.conf(5)
AUTHORS
The rpc.idmapd software has been developed by Marius Aamodt Eriksen <marius@citi.umich.edu>.
BSD
February 3, 2003 BSD