Quoting Ed Greshko Ed.Greshko@greshko.com:
On 12/24/13 17:21, Tom H wrote:
On Tue, Dec 24, 2013 at 2:10 AM, Ed Greshko Ed.Greshko@greshko.com wrote:
After making the suggested changes.....
[root@meimei ~]# mount -o ro,nfsvers=4 192.168.0.196:/home /mnt [root@meimei ~]# mount | grep mnt 192.168.0.196:/home on /mnt type nfs4 (ro,relatime,vers=4.0,rsize=262144,wsize=262144,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=192.168.0.18,local_lock=none,addr=192.168.0.196) [root@meimei ~]# umount /mnt
[root@meimei ~]# mount -o ro,nfsvers=3 192.168.0.196:/home /mnt mount.nfs: requested NFS version or transport protocol is not supported
I tried disallowing v2 and v3 on Fedora 19 and failed.
"cat /proc/fs/nfsd/versions" shows that v2 and v3 are allowed by the kernel and "mount -t -o nfsvers=3 ..." succeeds.
I ssh'd into a RHEL 6 box and an Ubuntu 14.04 VM where I know that v2 and v3 are disabled.
"cat /proc/fs/nfsd/versions" shows that v2 and v3 are disallowed and "mount -t -o nfsvers=3 ..." fails.
I must've done something wrong on Fedora 19. I'll have to try again later, but I can't see anything wrong in my setup offhand.
On an F20 system where I'm doing the testing
root@f20f ~]# cat /proc/fs/nfsd/versions -2 -3 +4 +4.1 -4.2
Shows only 4 and 4.1 allowed.
just to explain where this all came from, i was working off of what i was seeing on a RHEL (actually CentOS) 6.5 system, where the config file /etc/sysconfig/nfs had helpful comments which allowed me to tweak that file thusly:
# Define which protocol versions mountd # will advertise. The values are "no" or "yes" # with yes being the default MOUNTD_NFS_V2="no" MOUNTD_NFS_V3="no" ... snip ... # Optional arguments passed to rpc.nfsd. See rpc.nfsd(8) # Turn off v2 and v3 protocol support RPCNFSDARGS="-N 2 -N 3"
if i make the above changes and restart NFS (on the RHEL system), the *only* NFS-related entries i see in the output of "rpcinfo -p" are:
100003 4 tcp 2049 nfs 100003 4 udp 2049 nfs
and that's *it*, nothing more, which is what i expected.
sadly, i don't have access to my fedora 20 box at the moment, but all i was doing was trying to produce the same result -- only those two lines in the output of "rpcinfo -p". i can see that the *effect* of the earlier suggestions is the same, in that only NFSv4 is supported, but there is still that crud in the output of "rpcinfo -p" that seems irrelevant.
oh, and on the RHEL 6.5 system, the contents of the file /proc/fs/nfsd/versions correctly contains:
-2 -3 +4 -4.1
rday