Package: nfs-common Version: 1:1.2.6-3 Severity: important This NFS client stopped being able to mount from my NFS server at boot time, around the time I upgraded them both to wheezy. I think the problem started when only the server was upgraded and was ultimately triggered by avahi-daemon being installed. Since cups now recommends avahi-daemon, this can be considered a common configuration.
I took a packet capture on both sides (which matched, so no packets are
being lost) and saw that:
- The client makes a GETPORT call
- The client retries a few times at 1 second intervals, then (if using
TCP) closes the connection
- About 5 seconds after the first call from the client, the server sends
a reply. (strace-ing rpcbind showed it requesting a reverse DNS lookup
from avahi, which apparently has a 5 second timeout for mDNS lookups.
The client should have had a proper reverse DNS entry, but didn't.)
- The client sends a RST (TCP) or ICMP port unreachable error (UDP) when
receiving the reply
The relevant functions include nfs_pmap_getport() in
support/nfs/getport.c, which even has a comment to say:
* 2. This version times out quickly by default. It time-limits the
* connect process as well as the actual RPC call, and even allows the
* caller to specify the timeout.
I don't know why it does this, though perhaps the intent was to
fail-over quickly when auto-detecting whether the remote portmap/rpcbind
uses TCP or UDP. But having failed to query on both protocols, the
timeout ought to be increased when retrying.
Ben.
-- Package-specific info:
-- rpcinfo --
program vers proto port
100000 4 tcp 111 portmapper
100000 3 tcp 111 portmapper
100000 2 tcp 111 portmapper
100000 4 udp 111 portmapper
100000 3 udp 111 portmapper
100000 2 udp 111 portmapper
100024 1 udp 46254 status
100024 1 tcp 58492 status
100021 1 udp 33374 nlockmgr
100021 3 udp 33374 nlockmgr
100021 4 udp 33374 nlockmgr
100021 1 tcp 40195 nlockmgr
100021 3 tcp 40195 nlockmgr
100021 4 tcp 40195 nlockmgr
-- /etc/default/nfs-common --
NEED_STATD=
STATDOPTS=
NEED_IDMAPD=
NEED_GSSD=
-- /etc/idmapd.conf --
[General]
Verbosity = 0
Pipefs-Directory = /var/lib/nfs/rpc_pipefs
[Mapping]
Nobody-User = nobody
Nobody-Group = nogroup
-- /etc/fstab --
shadbolt:/home /home nfs nfsvers=3,nodev,nosuid,mountproto=tcp
0 0
shadbolt:/usr/local /usr/local nfs nfsvers=3,nodev,nosuid,mountproto=tcp
0 0
-- /proc/mounts --
rpc_pipefs /var/lib/nfs/rpc_pipefs rpc_pipefs rw,relatime 0 0
shadbolt:/home /home nfs
rw,nosuid,nodev,relatime,vers=3,rsize=262144,wsize=262144,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.2.1,mountvers=3,mountport=33045,mountproto=tcp,local_lock=none,addr=192.168.2.1
0 0
shadbolt:/usr/local /usr/local nfs
rw,nosuid,nodev,relatime,vers=3,rsize=262144,wsize=262144,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.2.1,mountvers=3,mountport=33045,mountproto=tcp,local_lock=none,addr=192.168.2.1
0 0
-- System Information:
Debian Release: 7.0
APT prefers stable
APT policy: (990, 'stable'), (500, 'stable-updates'), (500,
'proposed-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 3.2.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages nfs-common depends on:
ii adduser 3.113+nmu3
ii initscripts 2.88dsf-41
ii libc6 2.13-38
ii libcap2 1:2.22-1.2
ii libcomerr2 1.42.5-1.1
ii libdevmapper1.02.1 2:1.02.74-7
ii libevent-2.0-5 2.0.19-stable-3
ii libgssglue1 0.4-2
ii libk5crypto3 1.10.1+dfsg-5
ii libkeyutils1 1.5.5-3
ii libkrb5-3 1.10.1+dfsg-5
ii libmount1 2.20.1-5.3
ii libnfsidmap2 0.25-4
ii libtirpc1 0.2.2-5
ii libwrap0 7.6.q-24
ii lsb-base 4.1+Debian8
ii rpcbind 0.2.0-8
ii ucf 3.0025+nmu3
Versions of packages nfs-common recommends:
ii python 2.7.3-4
Versions of packages nfs-common suggests:
pn open-iscsi <none>
pn watchdog <none>
-- no debconf information
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