Stale NFS mounts and UDP vs. TCP
 

Novell Linux: Linux version 2.6.5-7.201-bigsmp (geeko@buildhost) (gcc version 3.3.3 (SuSE Linux)) #2 SMP Thu May 18 16:06:47 MDT 2006


Hello Forum!

I have a problem that I hope you can help me understand.

We have a computer environment that consists of using NIS and AMD. We were having a long standing issue of stale NFS mounts, and as it turns out, we had the following parameter set in our amd.conf file: nfs_proto = udp. We were thinking that if we switch from UDP to TCP, this would help get rid of the stale NFS mounts. The problem we are having is when the Linux machine is rebooted, it fails to automount a critical machine (boise1). After the reboot, in order to mount the machine boise1, we have to run the following command: amq -uf /net/boise1. After running amq, life is good. Here's what I observed.

Is there a reason why boise1 is not being properly automounted after reboot? Any help with this would be greatly appreciated!

From dmesg:

RPC: Can't bind to reserved port (98).
RPC: can't bind to reserved port.
RPC: error 5 connecting to server boise1
nfs_get_root: getattr error = 5
nfs_read_super: get root inode failed


After the amq -uf /net/boise1 command, I can run mount | grep boise1, and I get this:

boise1:/ on /.automount/net/boise1 type nfs (nounmount,vers=3,proto=tcp) boise1:/local on /.automount/net/boise1/local type nfs (nounmount,vers=3,proto=tcp)

Then I am able to cd into /net/boise1.

Here's the output from the rpcinfo:

program vers proto port
100000 2 tcp 111 portmapper
100000 2 udp 111 portmapper
100007 2 udp 894 ypbind
100007 1 udp 894 ypbind
100007 2 tcp 897 ypbind
100007 1 tcp 897 ypbind
300019 1 tcp 859 amd
300019 1 udp 860 amd
100024 1 udp 32770 status
100021 1 udp 32770 nlockmgr
100021 3 udp 32770 nlockmgr
100021 4 udp 32770 nlockmgr
100024 1 tcp 32768 status
100021 1 tcp 32768 nlockmgr
100021 3 tcp 32768 nlockmgr
100021 4 tcp 32768 nlockmgr
100003 2 udp 2049 nfs
100003 3 udp 2049 nfs
100227 3 udp 2049 nfs_acl
100003 2 tcp 2049 nfs
100003 3 tcp 2049 nfs
100227 3 tcp 2049 nfs_acl
100005 1 udp 991 mountd
100005 1 tcp 1006 mountd
100005 2 udp 991 mountd
100005 2 tcp 1006 mountd
100005 3 udp 991 mountd
100005 3 tcp 1006 mountd