I have a NFS server running on CentOS 7.2 and I have a problem with one (path/client host) declared in my /etc/exports that should be exported and that is not...

My /etc/exports file :

/mnt/data/ host1(rw,all_squash,anonuid=1001,anongid=1001)
/mnt/data/ host2(rw,all_squash,anonuid=1001,anongid=1001)
/mnt/data/ host3(rw,all_squash,anonuid=1001,anongid=1001)
/mnt/data/ host3(rw,all_squash,anonuid=1001,anongid=1001)

I restarted my nfs server and do exportfs -a so the output of cat /var/lib/nfs/etab is correct:

/mnt/data   host1(rw,sync,wdelay,hide,nocrossmnt,secure,root_squash,all_squash,no_subtree_check,secure_locks,acl,no_pnfs,anonuid=1001,anongid=1001,sec=sys,rw,secure,root_squash,all_squash)
/mnt/data   host2(rw,sync,wdelay,hide,nocrossmnt,secure,root_squash,all_squash,no_subtree_check,secure_locks,acl,no_pnfs,anonuid=1001,anongid=1001,sec=sys,rw,secure,root_squash,all_squash)
/mnt/data   host3(rw,sync,wdelay,hide,nocrossmnt,secure,root_squash,all_squash,no_subtree_check,secure_locks,acl,no_pnfs,anonuid=1001,anongid=1001,sec=sys,rw,secure,root_squash,all_squash)
/mnt/data   host4(rw,sync,wdelay,hide,nocrossmnt,secure,root_squash,all_squash,no_subtree_check,secure_locks,acl,no_pnfs,anonuid=1001,anongid=1001,sec=sys,rw,secure,root_squash,all_squash)

But when I run showmount -e it does not show me host1 :

/mnt/data host2 host3 host4

And actually I could not mount /mnt/data from host1 :

[root@host1 ~]# mount -a
mount.nfs: access denied by server while mounting nfs-server:/mnt/data/

Whereas the mount is OK from host2,3 and 4.

PS :For information :

  • host1...hostn can see and ping the NFS server
  • SElinux has been deactivated for tests
  • No firewall neither on server nor on client (VM are clones one from each other)


Thanks for your responses.

strace does not show much things:

stat("/run", {st_mode=S_IFDIR|0755, st_size=960, ...}) = 0
stat("/run/mount/utab", {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
getcwd("/root", 4095)                   = 6
readlink("/root/nfs-server:", 0x7ffe3a9ee090, 4096) = -1 ENOENT (No such file or directory)
readlink("/mnt", 0x7ffe3a9edf70, 4096)  = -1 EINVAL (Invalid argument)
readlink("/mnt/data", 0x7ffe3a9edf70, 4096) = -1 EINVAL (Invalid argument)
stat("/sbin/mount.nfs", {st_mode=S_IFREG|S_ISUID|0755, st_size=113400, ...}) = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7fd1b08f6b50) = 51633
wait4(-1, mount.nfs: access denied by server while mounting nfs-server:/mnt/data/
[{WIFEXITED(s) && WEXITSTATUS(s) == 32}], 0, NULL) = 51633
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=51633, si_status=32, si_utime=0, si_stime=0} ---
close(1)                                = 0
close(2)                                = 0
exit_group(0)                           = ?
+++ exited with 0 +++

What I see about running services on host1 side is that no nfsv4.0-svc service is running :

[root@host1 ~]# ps -aux --forest | grep nfs
root      1199  0.0  0.0      0     0 ?        S<   Feb15   0:00  \_ [nfsiod]

whereas it is running on other hosts that succeed in mounting /mnt/data

[root@host2 ~]$ ps -ef | grep nfs
root      1296     2  0 févr.15 ?     00:00:00 [nfsiod]
root      1302     2  0 févr.15 ?     00:00:00 [nfsv4.0-svc]

But I don't know if it is a cause or a consequence (i.e. nfsv4.0-svc is running because the mount succeed...) : could it be the source of the pb ?

  • Can you paste the output of strace on [root@host1 ~]# mount -a , such as strace mount -a
    – Ijaz Ahmad
    Feb 16, 2017 at 15:22
  • Can you please make sure all nfs related packages are installed on host1 and all the services are enabled and started
    – Ijaz Ahmad
    Feb 16, 2017 at 15:23
  • Disable Selinux on both server and host1
    – Ijaz Ahmad
    Feb 16, 2017 at 15:24
  • Can you do a port scan from host1 to server? Can you see the NFS service ports from client , use nmap and telnet
    – Ijaz Ahmad
    Feb 16, 2017 at 15:26
  • NFS clinet versions are the same on all hosts??
    – Ijaz Ahmad
    Feb 16, 2017 at 15:27

1 Answer 1


Sorry for the last post that was not a response... I'm quite new to stackexchange.

I finally found the problem: when running showmount -e or showmount -e [nfs-server DNS], the showed exports was not good.

But when running showmount -e localhost or showmount -e [nfs-server IP] its showed the correct exports (with host1 within).

So running my mount on host1 with the nfs-server IP solve the problem (too bad for our clone VM automation based on DNS...)

We are running or infrastructure on Azure so perhaps this DNS issue comes from it.



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