[Solved] NFS mount problem

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dmetech
Posts: 3
Joined: 2015/12/29 21:47:34

[Solved] NFS mount problem

Post by dmetech » 2020/04/26 05:26:39

This problem involves two physical PCs and one VirtualBox PC running on the same physical network:

C8: new physical PC running CentOS 8.1 (ip 192.168.1.8)
C7: older physical PC running CentOS 7.7 (ip 192.168.1.7)
VB: VirtualBox 6.1.6 running Red Hat 7.3 (the original version from 2002); uses bridged adapter ip 192.168.1.37

SElinux and firewalld are disabled on C7 and C8, and all updates have been installed on C7 and C8.

I am transitioning from using C7 as my work PC to C8. I need VB to have the ability to mount directories via NFS on its host system. When VB is running on C7, the mounts work fine. When VB is running on C8, the mount (mount -t nfs 192.168.1.8:/d /d) hangs indefinitely with the message "nfs: server 192.168.1.8 not responding, still trying".

During troubleshooting, I found that:
1) VB on C8 can ping C8
2) VB on C8 can mount directories on C7
3) C7 can mount directories on C8 (so nfs is running correctly on C8)

Are there settings on C8 and/or VB that I can change to enable directories on C8 to mount on VB?
Last edited by dmetech on 2020/05/17 04:49:31, edited 1 time in total.

aks
Posts: 2994
Joined: 2014/09/20 11:22:14

Re: NFS mount problem

Post by aks » 2020/04/27 18:04:06

Sounds more like a networking problem.

dmetech
Posts: 3
Joined: 2015/12/29 21:47:34

Re: NFS mount problem

Post by dmetech » 2020/05/17 04:44:07

I found that the problem is the fact that in CentOS 8, NFSv3 over UDP is no longer supported. The solution is to specify in the mount options to use TCP.

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