Comme proposé par DjKlaus, j’ai remplacé le nom DNS par son IP, pas de montage au démarrage si eth0 est gérée par NetworkManager.
Voici quelques grep de syslog dans ce cas.
root@debian:~# grep -i nfs /var/log/syslog
Sep 24 09:18:46 debian kernel: [ 14.869516] RPC: Registered tcp NFSv4.1 backchannel transport module.
Sep 24 09:18:46 debian kernel: [ 14.945729] FS-Cache: Netfs 'nfs' registered for caching
Sep 24 09:18:46 debian kernel: [ 14.958927] Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
Sep 24 09:18:46 debian kernel: [ 17.163450] NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory
Sep 24 09:18:46 debian kernel: [ 17.180712] NFSD: starting 90-second grace period
root@debian:~# grep -i mount /var/log/syslog
Sep 24 09:18:46 debian kernel: [ 0.001446] Mount-cache hash table entries: 256
Sep 24 09:18:46 debian kernel: [ 3.377002] EXT4-fs (sdc1): mounted filesystem with ordered data mode. Opts: (null)
Sep 24 09:18:46 debian kernel: [ 10.119811] EXT4-fs (sdc1): re-mounted. Opts: (null)
Sep 24 09:18:46 debian kernel: [ 10.403685] EXT4-fs (sdc1): re-mounted. Opts: errors=remount-ro
Sep 24 09:18:46 debian kernel: [ 13.756564] EXT4-fs (sdc2): mounted filesystem with ordered data mode. Opts: (null)
Sep 24 09:18:46 debian kernel: [ 13.853383] EXT4-fs (dm-0): mounted filesystem with ordered data mode. Opts: (null)
Sep 24 09:18:46 debian kernel: [ 13.895863] EXT4-fs (sda5): mounted filesystem with ordered data mode. Opts: (null)
Sep 24 09:18:47 debian rpc.mountd[2556]: Version 1.2.6 starting
root@debian:~# grep -i net /var/log/syslog
Sep 24 09:18:46 debian kernel: [ 0.001592] Initializing cgroup subsys net_cls
Sep 24 09:18:46 debian kernel: [ 0.585635] NET: Registered protocol family 16
Sep 24 09:18:46 debian kernel: [ 0.652573] NET: Registered protocol family 2
Sep 24 09:18:46 debian kernel: [ 0.655929] NET: Registered protocol family 1
Sep 24 09:18:46 debian kernel: [ 0.840252] audit: initializing netlink socket (disabled)
Sep 24 09:18:46 debian kernel: [ 1.120683] NET: Registered protocol family 10
Sep 24 09:18:46 debian kernel: [ 1.121212] NET: Registered protocol family 17
Sep 24 09:18:46 debian kernel: [ 1.128294] Initializing network drop monitor service
Sep 24 09:18:46 debian kernel: [ 1.195658] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
Sep 24 09:18:46 debian kernel: [ 14.945729] FS-Cache: Netfs 'nfs' registered for caching
Sep 24 09:18:47 debian acpid: starting up with netlink and the input layer
Sep 24 09:18:49 debian kernel: [ 20.371878] NET: Registered protocol family 31
Sep 24 09:18:50 debian kernel: [ 20.906416] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
Sep 24 09:18:50 debian avahi-daemon[2967]: Network interface enumeration completed.
Sep 24 09:18:51 debian NetworkManager[3081]: <info> NetworkManager (version 0.9.4.0) is starting...
Sep 24 09:18:51 debian NetworkManager[3081]: <info> Read config file /etc/NetworkManager/NetworkManager.conf
Sep 24 09:18:53 debian NetworkManager[3081]: SCPlugin-Ifupdown: init!
Sep 24 09:18:53 debian NetworkManager[3081]: SCPlugin-Ifupdown: update_system_hostname
Sep 24 09:18:53 debian NetworkManager[3081]: SCPluginIfupdown: management mode: unmanaged
Sep 24 09:18:53 debian NetworkManager[3081]: SCPlugin-Ifupdown: devices added (path: /sys/devices/pci0000:00/0000:00:1c.7/0000:03:00.0/net/eth0, iface: eth0)
Sep 24 09:18:53 debian NetworkManager[3081]: SCPlugin-Ifupdown: device added (path: /sys/devices/pci0000:00/0000:00:1c.7/0000:03:00.0/net/eth0, iface: eth0): no ifupdown configuration found.
Sep 24 09:18:53 debian NetworkManager[3081]: SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/lo, iface: lo)
Sep 24 09:18:53 debian NetworkManager[3081]: SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/lo, iface: lo): no ifupdown configuration found.
Sep 24 09:18:53 debian NetworkManager[3081]: SCPlugin-Ifupdown: end _init.
Sep 24 09:18:53 debian NetworkManager[3081]: <info> Loaded plugin ifupdown: (C) 2008 Canonical Ltd. To report bugs please use the NetworkManager mailing list.
Sep 24 09:18:53 debian NetworkManager[3081]: <info> Loaded plugin keyfile: (c) 2007 - 2010 Red Hat, Inc. To report bugs please use the NetworkManager mailing list.
Sep 24 09:18:53 debian NetworkManager[3081]: Ifupdown: get unmanaged devices count: 0
Sep 24 09:18:53 debian NetworkManager[3081]: SCPlugin-Ifupdown: (8070976) ... get_connections.
Sep 24 09:18:53 debian NetworkManager[3081]: SCPlugin-Ifupdown: (8070976) ... get_connections (managed=false): return empty list.
Sep 24 09:18:53 debian NetworkManager[3081]: keyfile: parsing Wired connection 1 ...
Sep 24 09:18:53 debian NetworkManager[3081]: keyfile: read connection 'Wired connection 1'
Sep 24 09:18:53 debian NetworkManager[3081]: Ifupdown: get unmanaged devices count: 0
Sep 24 09:18:53 debian NetworkManager[3081]: <info> trying to start the modem manager...
Sep 24 09:18:53 debian NetworkManager[3081]: <info> monitoring kernel firmware directory '/lib/firmware'.
Sep 24 09:18:53 debian NetworkManager[3081]: <info> WiFi enabled by radio killswitch; enabled by state file
Sep 24 09:18:53 debian NetworkManager[3081]: <info> WWAN enabled by radio killswitch; enabled by state file
Sep 24 09:18:53 debian NetworkManager[3081]: <info> WiMAX enabled by radio killswitch; enabled by state file
Sep 24 09:18:53 debian NetworkManager[3081]: <info> Networking is enabled by state file
Sep 24 09:18:53 debian NetworkManager[3081]: <warn> failed to allocate link cache: (-10) Operation not supported
Sep 24 09:18:53 debian NetworkManager[3081]: <info> (eth0): carrier is OFF
Sep 24 09:18:53 debian NetworkManager[3081]: <info> (eth0): new Ethernet device (driver: 'r8169' ifindex: 2)
Sep 24 09:18:53 debian NetworkManager[3081]: <info> (eth0): exported as /org/freedesktop/NetworkManager/Devices/0
Sep 24 09:18:53 debian NetworkManager[3081]: <info> (eth0): now managed
Sep 24 09:18:53 debian NetworkManager[3081]: <info> (eth0): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Sep 24 09:18:53 debian NetworkManager[3081]: <info> (eth0): bringing up device.
Sep 24 09:18:54 debian NetworkManager[3081]: <info> (eth0): preparing device.
Sep 24 09:18:54 debian NetworkManager[3081]: <info> (eth0): deactivating device (reason 'managed') [2]
Sep 24 09:18:54 debian kernel: [ 24.575927] ADDRCONF(NETDEV_UP): eth0: link is not ready
Sep 24 09:18:54 debian NetworkManager[3081]: <info> modem-manager is now available
Sep 24 09:18:54 debian kernel: [ 24.753152] ip_tables: (C) 2000-2006 Netfilter Core Team
Sep 24 09:18:56 debian kernel: [ 27.351304] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
Sep 24 09:18:56 debian NetworkManager[3081]: <info> (eth0): carrier now ON (device state 20)
Sep 24 09:18:56 debian NetworkManager[3081]: <info> (eth0): device state change: unavailable -> disconnected (reason 'carrier-changed') [20 30 40]
Sep 24 09:18:56 debian NetworkManager[3081]: <info> Auto-activating connection 'Wired connection 1'.
Sep 24 09:18:56 debian NetworkManager[3081]: <info> Activation (eth0) starting connection 'Wired connection 1'
Sep 24 09:18:56 debian NetworkManager[3081]: <info> (eth0): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Sep 24 09:18:56 debian NetworkManager[3081]: <info> Activation (eth0) Stage 1 of 5 (Device Prepare) scheduled...
Sep 24 09:18:56 debian NetworkManager[3081]: <info> Activation (eth0) Stage 1 of 5 (Device Prepare) started...
Sep 24 09:18:56 debian NetworkManager[3081]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) scheduled...
Sep 24 09:18:56 debian NetworkManager[3081]: <info> Activation (eth0) Stage 1 of 5 (Device Prepare) complete.
Sep 24 09:18:56 debian NetworkManager[3081]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) starting...
Sep 24 09:18:56 debian NetworkManager[3081]: <info> (eth0): device state change: prepare -> config (reason 'none') [40 50 0]
Sep 24 09:18:56 debian NetworkManager[3081]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) successful.
Sep 24 09:18:56 debian NetworkManager[3081]: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) scheduled.
Sep 24 09:18:56 debian NetworkManager[3081]: <info> Activation (eth0) Stage 2 of 5 (Device Configure) complete.
Sep 24 09:18:56 debian NetworkManager[3081]: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) started...
Sep 24 09:18:56 debian NetworkManager[3081]: <info> (eth0): device state change: config -> ip-config (reason 'none') [50 70 0]
Sep 24 09:18:56 debian NetworkManager[3081]: <info> Activation (eth0) Beginning DHCPv4 transaction (timeout in 45 seconds)
Sep 24 09:18:56 debian NetworkManager[3081]: <info> dhclient started with pid 3277
Sep 24 09:18:56 debian NetworkManager[3081]: <info> Activation (eth0) Stage 3 of 5 (IP Configure Start) complete.
Sep 24 09:18:56 debian dhclient: Internet Systems Consortium DHCP Client 4.2.2
Sep 24 09:18:56 debian dhclient: Copyright 2004-2011 Internet Systems Consortium.
Sep 24 09:18:56 debian NetworkManager[3081]: <info> (eth0): DHCPv4 state changed nbi -> preinit
Sep 24 09:18:57 debian NetworkManager[3081]: <info> (eth0): DHCPv4 state changed preinit -> reboot
Sep 24 09:18:57 debian NetworkManager[3081]: <info> address 192.168.1.70
Sep 24 09:18:57 debian NetworkManager[3081]: <info> prefix 24 (255.255.255.0)
Sep 24 09:18:57 debian NetworkManager[3081]: <info> gateway 192.168.1.1
Sep 24 09:18:57 debian NetworkManager[3081]: <info> hostname 'debian'
Sep 24 09:18:57 debian NetworkManager[3081]: <info> nameserver '192.168.1.1'
Sep 24 09:18:57 debian NetworkManager[3081]: <info> Activation (eth0) Stage 5 of 5 (IPv4 Configure Commit) scheduled...
Sep 24 09:18:57 debian NetworkManager[3081]: <info> Activation (eth0) Stage 5 of 5 (IPv4 Commit) started...
Sep 24 09:18:58 debian NetworkManager[3081]: <info> (eth0): device state change: ip-config -> activated (reason 'none') [70 100 0]
Sep 24 09:18:58 debian NetworkManager[3081]: <info> Policy set 'Wired connection 1' (eth0) as default for IPv4 routing and DNS.
Sep 24 09:18:58 debian NetworkManager[3081]: <info> Activation (eth0) successful, device activated.
Sep 24 09:18:58 debian NetworkManager[3081]: <info> Activation (eth0) Stage 5 of 5 (IPv4 Commit) complete.
Après un mount -a, les points de mpontage sont OK et syslog inchangé…
Pour info :
root@debian:~# mount | grep NAS
192.168.1.40:/volume1/public/ on /mnt/NAS/public type nfs (rw,relatime,vers=3,rsize=32768,wsize=32768,namlen=255,soft,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.1.40,mountvers=3,mountport=892,mountproto=udp,local_lock=none,addr=192.168.1.40)
192.168.1.40:/volume1/photo/ on /mnt/NAS/photo type nfs (rw,relatime,vers=3,rsize=32768,wsize=32768,namlen=255,soft,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.1.40,mountvers=3,mountport=892,mountproto=udp,local_lock=none,addr=192.168.1.40)
192.168.1.40:/volume1/music/ on /mnt/NAS/music type nfs (rw,relatime,vers=3,rsize=32768,wsize=32768,namlen=255,soft,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.1.40,mountvers=3,mountport=892,mountproto=udp,local_lock=none,addr=192.168.1.40)
192.168.1.40:/volume1/video/ on /mnt/NAS/video type nfs (rw,relatime,vers=3,rsize=32768,wsize=32768,namlen=255,soft,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.1.40,mountvers=3,mountport=892,mountproto=udp,local_lock=none,addr=192.168.1.40)
192.168.1.40:/volume1/web/ on /mnt/NAS/web type nfs (rw,relatime,vers=3,rsize=32768,wsize=32768,namlen=255,soft,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.1.40,mountvers=3,mountport=892,mountproto=udp,local_lock=none,addr=192.168.1.40)
192.168.1.40:/volume1/homes/michel/ on /mnt/NAS/home type nfs (rw,relatime,vers=3,rsize=32768,wsize=32768,namlen=255,soft,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.1.40,mountvers=3,mountport=892,mountproto=udp,local_lock=none,addr=192.168.1.40)