Hello,
I have recently started to experience a strange problem with rpc.mountd in
redhat 5.1. We are running a number of sites using a Linux server and a
number of diskless workstations with etherboot. Workstations are used as
character-based terminals, to telnet to the server, plus they have a
printer connected, accesible via lpd. These sites are remote. Each of
the servers got two network cards, one to connect to the WAN backbone,
while the hub with the workstations is connected to the second card.
Unfortunately we started running into major problems as rpc.mountd
intermittently hangs, and though it still appeares in ps table it would
not serve any mount requests. If I do showmount localhost I am getting rpc
timed out.
Sometimes this happens when a server just came up, sometimes after it has
been working for a while, after restarting mountd everything works again.
If I send a signal (HUP or USR1) in this hanging state, mountd dies
instead of rereading /etc/exports. And I am getting no syslog messages.
The problem is intermittent, I can not reproduce it at will, it
happens now and then at random. I guess if I only had one site I would not
have noticed this, but we are running about 140 sites set up like this, so
I am getting about 10 sites that are hanging every day. I tried to
upgrade to nfs 2.2beta37 but that did not make any difference, same story
as with redhat's 2.2beta29. It does not seem to be happening with redhat
4.2 based systems though. I will configure a couple of sites to run with
-d call option, but I will have to wait for the problem to reoccur.
My /etc/exports
/tftpboot/rootfs.2 ws01.ucs(rw,no_root_squash)
/tftpboot/rootfs.3 ws02.ucs(rw,no_root_squash)
/tftpboot/rootfs.4 ws03.ucs(rw,no_root_squash)
/tftpboot/rootfs.5 ws04.ucs(rw,no_root_squash)
/tftpboot/rootfs.6 ws05.ucs(rw,no_root_squash)
/tftpboot/rootfs.7 ws06.ucs(rw,no_root_squash)
/tftpboot/rootfs.8 ws07.ucs(rw,no_root_squash)
/tftpboot/rootfs.9 ws08.ucs(rw,no_root_squash)
/tftpboot/rootfs.10 ws09.ucs(rw,no_root_squash)
/tftpboot/rootfs.11 ws10.ucs(rw,no_root_squash)
/tftpboot/rootfs.12 ws11.ucs(rw,no_root_squash)
/tftpboot/rootfs.13 ws12.ucs(rw,no_root_squash)
/tftpboot/rootfs.14 ws13.ucs(rw,no_root_squash)
/tftpboot/rootfs.15 ws14.ucs(rw,no_root_squash)
/tftpboot/rootfs.16 ws15.ucs(rw,no_root_squash)
/tftpboot/rootfs.17 ws16.ucs(rw,no_root_squash)
/tftpboot/rootfs.18 ws17.ucs(rw,no_root_squash)
/tftpboot/rootfs.19 ws18.ucs(rw,no_root_squash)
/tftpboot/rootfs.20 ws19.ucs(rw,no_root_squash)
/tftpboot/rootfs.21 ws20.ucs(rw,no_root_squash)
/tftpboot/rootfs.22 ws21.ucs(rw,no_root_squash)
/tftpboot/rootfs.23 ws22.ucs(rw,no_root_squash)
/tftpboot/rootfs.24 ws23.ucs(rw,no_root_squash)
/tftpboot/rootfs.25 ws24.ucs(rw,no_root_squash)
/tftpboot/rootfs.26 ws25.ucs(rw,no_root_squash)
/tftpboot/rootfs.27 ws26.ucs(rw,no_root_squash)
/tftpboot/rootfs.28 ws27.ucs(rw,no_root_squash)
/tftpboot/rootfs.29 ws28.ucs(rw,no_root_squash)
/tftpboot/rootfs.30 ws29.ucs(rw,no_root_squash)
/tftpboot/rootfs.31 ws30.ucs(rw,no_root_squash)
/tftpboot/rootfs.32 ws31.ucs(rw,no_root_squash)
/tftpboot/rootfs.33 ws32.ucs(rw,no_root_squash)
/tftpboot/rootfs.34 ws33.ucs(rw,no_root_squash)
/tftpboot/rootfs.35 ws34.ucs(rw,no_root_squash)
/tftpboot/rootfs.36 ws35.ucs(rw,no_root_squash)
/tftpboot/rootfs.37 ws36.ucs(rw,no_root_squash)
/tftpboot/rootfs.38 ws37.ucs(rw,no_root_squash)
/tftpboot/rootfs.39 ws38.ucs(rw,no_root_squash)
/tftpboot/rootfs.40 ws39.ucs(rw,no_root_squash)
/tftpboot/rootfs.41 ws40.ucs(rw,no_root_squash)
/tftpboot/rootfs.42 ws41.ucs(rw,no_root_squash)
/tftpboot/rootfs.43 ws42.ucs(rw,no_root_squash)
/tftpboot/rootfs.44 ws43.ucs(rw,no_root_squash)
/tftpboot/rootfs.45 ws44.ucs(rw,no_root_squash)
/tftpboot/rootfs.46 ws45.ucs(rw,no_root_squash)
/tftpboot/rootfs.47 ws46.ucs(rw,no_root_squash)
/tftpboot/rootfs.48 ws47.ucs(rw,no_root_squash)
/tftpboot/rootfs.49 ws48.ucs(rw,no_root_squash)
/tftpboot/rootfs.50 ws49.ucs(rw,no_root_squash)
/tftpboot/rootfs.51 ws50.ucs(rw,no_root_squash)
/tftpboot/rootfs.52 ws51.ucs(rw,no_root_squash)
/tftpboot/rootfs.53 ws52.ucs(rw,no_root_squash)
/tftpboot/rootfs.54 ws53.ucs(rw,no_root_squash)
/tftpboot/rootfs.55 ws54.ucs(rw,no_root_squash)
/tftpboot/rootfs.56 ws55.ucs(rw,no_root_squash)
/tftpboot/rootfs.57 ws56.ucs(rw,no_root_squash)
/tftpboot/rootfs.58 ws57.ucs(rw,no_root_squash)
/tftpboot/rootfs.59 ws58.ucs(rw,no_root_squash)
/tftpboot/rootfs.60 ws59.ucs(rw,no_root_squash)
/tftpboot/rootfs.61 ws60.ucs(rw,no_root_squash)
/tftpboot/rootfs.62 ws61.ucs(rw,no_root_squash)
/tftpboot/rootfs.63 ws62.ucs(rw,no_root_squash)
/tftpboot/rootfs.64 ws63.ucs(rw,no_root_squash)
/tftpboot/rootfs.65 ws64.ucs(rw,no_root_squash)
/tftpboot/rootfs.66 ws65.ucs(rw,no_root_squash)
/tftpboot/rootfs.67 ws66.ucs(rw,no_root_squash)
/tftpboot/rootfs.68 ws67.ucs(rw,no_root_squash)
/tftpboot/rootfs.69 ws68.ucs(rw,no_root_squash)
/tftpboot/rootfs.70 ws69.ucs(rw,no_root_squash)
/tftpboot/rootfs.71 ws70.ucs(rw,no_root_squash)
/tftpboot/rootfs.72 ws71.ucs(rw,no_root_squash)
/tftpboot/rootfs.73 ws72.ucs(rw,no_root_squash)
/tftpboot/rootfs.74 ws73.ucs(rw,no_root_squash)
/tftpboot/rootfs.75 ws74.ucs(rw,no_root_squash)
/tftpboot/rootfs.76 ws75.ucs(rw,no_root_squash)
/tftpboot/rootfs.77 ws76.ucs(rw,no_root_squash)
/tftpboot/rootfs.78 ws77.ucs(rw,no_root_squash)
/tftpboot/rootfs.79 ws78.ucs(rw,no_root_squash)
/tftpboot/rootfs.80 ws79.ucs(rw,no_root_squash)
/tftpboot/rootfs.81 ws80.ucs(rw,no_root_squash)
/tftpboot/rootfs.82 ws81.ucs(rw,no_root_squash)
/tftpboot/rootfs.83 ws82.ucs(rw,no_root_squash)
/tftpboot/rootfs.84 ws83.ucs(rw,no_root_squash)
/tftpboot/rootfs.85 ws84.ucs(rw,no_root_squash)
/tftpboot/rootfs.86 ws85.ucs(rw,no_root_squash)
/tftpboot/rootfs.87 ws86.ucs(rw,no_root_squash)
/tftpboot/rootfs.88 ws87.ucs(rw,no_root_squash)
/tftpboot/rootfs.89 ws88.ucs(rw,no_root_squash)
/tftpboot/rootfs.90 ws89.ucs(rw,no_root_squash)
/tftpboot/rootfs.91 ws90.ucs(rw,no_root_squash)
/tftpboot/rootfs.92 ws91.ucs(rw,no_root_squash)
/tftpboot/rootfs.93 ws92.ucs(rw,no_root_squash)
/tftpboot/rootfs.94 ws93.ucs(rw,no_root_squash)
/tftpboot/rootfs.95 ws94.ucs(rw,no_root_squash)
/tftpboot/rootfs.96 ws95.ucs(rw,no_root_squash)
/tftpboot/rootfs.97 ws96.ucs(rw,no_root_squash)
/tftpboot/rootfs.98 ws97.ucs(rw,no_root_squash)
/tftpboot/rootfs.99 ws98.ucs(rw,no_root_squash)
/tftpboot/rootfs.100 ws99.ucs(rw,no_root_squash)
/tftpboot/bin *.ucs(ro,no_root_squash)
/tftpboot/sbin *.ucs(ro,no_root_squash)
/tftpboot/lib *.ucs(ro,no_root_squash)
/tftpboot/boot *.ucs(ro,no_root_squash)
/tftpboot/usr *.ucs(ro,no_root_squash)
/tftpboot/etc *.ucs(ro,no_root_squash)
/tftpboot/var *.ucs(ro,no_root_squash)
/tftpboot/home *.ucs(rw,no_root_squash)
/tftpboot/be0 *.ucs(rw,no_root_squash)
The process table on a workstation:
PID TTY STAT TIME COMMAND
1 ? S 0:02 init [3]
2 ? SW 0:00 (kflushd)
3 ? SW< 0:00 (kswapd)
4 ? SW 0:00 (nfsiod)
5 ? SW 0:00 (nfsiod)
6 ? SW 0:00 (nfsiod)
7 ? SW 0:00 (nfsiod)
91 ? S 0:56 syslogd
93 ? S 0:00 klogd -c 1
101 ? S 0:00 lpd -l
104 ? S 0:00 inetd
118 ? S 0:00 update (bdflush)
18505 ? S 0:00 ypbind (master)
18506 ? S 0:00 ypbind (slave)
18530 1 S 0:01 telnet -l su01 172.30.160.1
18531 ? S 0:00 in.rshd
18532 ? S 0:00 sh -c ps ax
18533 ? R 0:00 ps ax
95 ? S 0:17 portmap
Any help will be greatly appreciated,
Regards,
Alex
---------------------------------------------------------------------------
Alex Harin, PhD Universal Computer Services
Tel +27 11 339-6111 PO Box 31266 Braamfontein 2017, South Africa
Cell +27 82 900-4779 20th Floor, Total House, Smit St, Braamfontein
Fax +27 11 339-3421 Johannesburg, South Africa
alex@ucs.co.za ********** http://www.ucs.co.za ****************************
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