I'm troubleshooting some problem with NFS server, mountd to be precise. Server is running AIX 5.3. When NFS starts, mountd listens both on TCP and UDP ports:
Port 6666 is fixed in /etc/services. After the start server works fine, clients can mount exported directories without any issues. After some time (not sure how long, perhaps after some idle period) mountd stops listening on TCP and only UDP remains:
The problem is that clients still try to contact TCP port first, despite the fact (I can see that in network trace) that portmap says TCP program is not available. Such requests are retransmitted until they timeout and there is 2 min delay in service because of such retransmits. After timeout client tries UDP port and everything goes fine. Roughly speaking, network conversation goes like this:
Any ideas why mountd stops listening on TCP? Of course, there is another issue with clients who insist on TCP and ignores answers from portmap, but I thought I'll start with server side. In fact, I tried to read a bit about such client behaviour, too, but found nothing.
Hi, folks.
Sorry for bothering, but maybe someone could help me please.
The problem is the following:
there is some script that copies files from local file system to AFS. The copying is performed with dd command.
The script copies data into some AFS volumes.
The problem appeared with one... (0 Replies)
Hi
Please help me with the following problem with my script.
The following block of code is not repeating in the while loop and exiting after searching for first message.
input_file
==========
host001-01
host001-02
2008-07-23 13:02:04,651 ConnectionFactory - Setting session state... (2 Replies)
1) when user login to the server the session got colosed. How will resolve?
2) While firing the command ls -l we are not able to see the any files in the director. but over all view the file system using the command df -g it is showing 91% used. what will be the problem?
Thanks in advance. (1 Reply)
Hi,
i've a redhat linux 9 upadated by redhat from 7 version to 9 version. A couple of days ago i was a problem with my mail, in other words i'm not able to get any email nor to send any email. I've a proxy configuration and i tried to set iptables in order to verify the port. The 110,255 and 995... (1 Reply)
At work I am trying to get this one Linux machine (let's call it ctesgm07) to behave like another Linux machine that we have (let's call it test007).
test007 returns the following version info:
cat /etc/debian_version: lenny/sid
uname -a: Linux test007 2.6.27-7-generic #1 SMP Tue Nov 4... (0 Replies)
Dear ALL.
I installed AIX OS on customer sites.
but Only one site is too slow when I connected telnet, ftp..
Ping is too fast. but telnet and FTP is not connected..
of course i check the configuration file on aix but it's normal.
Do any Idea??
thanks in advance.
- Jun - (3 Replies)
Hi,
This is rather a question from a "user" than from a sys admin, but I think this forum is apropriate for the question.
I have an adress with automatic email forwarding and for some senders (two hietherto), emails are bouncing. This has really created a lot of problems those two time so I... (0 Replies)
I don't know if you guys get this problem sometimes at Terminal but I had been having this problem since yesterday :( Maybe I overdid the Terminal. Even the codes that used to work doesn't work anymore.
Here is what 's happening:
* I wanted to remove lines containing digits so I used this... (25 Replies)
Hi everyone,
I am experiencing discontinuity of Internet service, this started 1 month ago. Everything worked very well for 1 year of intensive use, but now, I have problems reaching my gateway.
The gateway is not my router but a node belonging to my ISP and I share the same public IP with... (3 Replies)
Discussion started by: remic
3 Replies
LEARN ABOUT REDHAT
rpc.mountd
rpc.mountd(8) System Manager's Manual rpc.mountd(8)NAME
rpc.mountd - NFS mount daemon
SYNOPSIS
/usr/sbin/rpc.mountd [options]
DESCRIPTION
The rpc.mountd program implements the NFS mount protocol. When receiving a MOUNT request from an NFS client, it checks the request against
the list of currently exported file systems. If the client is permitted to mount the file system, rpc.mountd obtains a file handle for
requested directory and returns it to the client.
Exporting NFS File Systems
Making file systems available to NFS clients is called exporting.
Usually, a file system and the hosts it should be made available to are listed in the /etc/exports file, and invoking exportfs -a whenever
the system is booted. The exportfs(8) command makes export information available to both the kernel NFS server module and the rpc.mountd
daemon.
Alternatively, you can export individual directories temporarily using exportfs's host:/directory syntax.
The rmtab File
For every mount request received from an NFS client, rpc.mountd adds an entry to the /var/lib/nfs/rmtab file. When receiving an unmount
request, that entry is removed. user level part of the NFS service.
However, this file is mostly ornamental. One, the client can continue to use the file handle even after calling rpc.mountd 's UMOUNT proce-
dure. And two, if a client reboots without notifying rpc.mountd , a stale entry will remain in rmtab.
OPTIONS -d kind or --debug kind
Turn on debugging for kind.
-F or --foreground
Run in foreground (do not daemonize)
-f or --exports-file
This option specifies the exports file, listing the clients that this server is prepared to serve and parameters to apply to each
such mount (see exports(5)). By default, export information is read from /etc/exports.
-h or --help
Display usage message.
-o num or --descriptors num
Set the limit of the number of open file descriptors to num. The default is 256.
-N or --no-nfs-version
This option can be used to request that rpc.mountd do not offer certain versions of NFS. The current version of rpc.mountd can sup-
port both NFS version 2 and the newer version 3. If the NFS kernel module was compiled without support for NFSv3, rpc.mountd must be
invoked with the option --no-nfs-version 3 .
-n or --no-tcp
Don't advertise TCP for mount.
-P Ignored (compatibility with unfsd??).
-p or --port num
Force rpc.mountd to bind to the specified port num, instead of using the random port number assigned by the portmapper.
-V or --nfs-version
This option can be used to request that rpc.mountd offer certain versions of NFS. The current version of rpc.mountd can support both
NFS version 2 and the newer version 3.
-v or --version
Print the version of rpc.mountd and exit.
TCP_WRAPPERS SUPPORT
This rpc.mountd version is protected by the tcp_wrapper library. You have to give the clients access to rpc.mountd if they should be
allowed to use it. To allow connects from clients of the .bar.com domain you could use the following line in /etc/hosts.allow:
mountd: .bar.com
You have to use the daemon name mountd for the daemon name (even if the binary has a different name).
For further information please have a look at the tcpd(8) and hosts_access(5) manual pages.
SEE ALSO rpc.nfsd(8), exportfs(8), exports(5), rpc.rquotad(8).
FILES
/etc/exports, /var/lib/nfs/xtab.
AUTHOR
Olaf Kirch, H. J. Lu, G. Allan Morris III, and a host of others.
25 Aug 2000 rpc.mountd(8)