systemd：NFS共有のマウントに失敗しました：mount.nfs：ブートプロセスの後半までネットワークに到達できません
私のラップトップにはUSBイーサネットアダプターがあります。どうやら、ネットワークは通常よりもブートプロセスの後半まで起動しません。 NFS共有が起動時にマウントされません。ただし、ラップトップが起動するとすぐに、次のコマンドですべての共有をマウントできます。
mount -a -t nfs,nfs4
エラーはなく、その時点ですべてが正常です。ただし、起動時に共有を自動的にマウントしたいと思います。したがって、これはnot NFS構成の質問です。この問題はsystemd、起動プロセス、およびUSBイーサネットアダプターが使用可能になるタイミングに関連していると思います。
NFS共有がマウントの試行をやめた後にネットワークが立ち上がることを示すジャーナルの関連部分を含め、ここで私が確認するすべてのことを確認します。関連する構成ファイルを含めましたが、それらはデフォルトから変更されていません（私の知る限り）。
Jul 31 21:22:32 Host systemd[1]: Mounted /var/log.
...
Jul 31 21:22:33 Host mount[898]: mount.nfs: Network is unreachable
...
Jul 31 21:22:34 Host mount[880]: mount.nfs: Resource temporarily unavailable
Jul 31 21:22:34 Host systemd[1]: share1.mount: Mount process exited, code=exited status=32
Jul 31 21:22:34 Host systemd[1]: share1.mount: Failed with result 'exit-code'.
Jul 31 21:22:34 Host autossh[896]: starting ssh (count 9)
Jul 31 21:22:34 Host autossh[896]: ssh child pid is 1033
Jul 31 21:22:34 Host systemd[1]: Failed to mount /share1.
...
Jul 31 21:22:37 Host autossh[899]: ssh: connect to Host 10.10.0.201 port 22: Network is unreachable
Jul 31 21:22:37 Host autossh[899]: ssh exited with error status 255; restarting ssh
...
Jul 31 21:22:38 Host NetworkManager[792]: <info> [1533086558.3237] manager: NetworkManager state is now CONNECTING
...
Jul 31 21:22:38 Host NetworkManager[792]: <info> [1533086558.3487] manager: NetworkManager state is now CONNECTED_LOCAL
Jul 31 21:22:38 Host NetworkManager[792]: <info> [1533086558.3492] manager: NetworkManager state is now CONNECTED_SITE
Jul 31 21:22:38 Host NetworkManager[792]: <info> [1533086558.3493] policy: set 'Wired connection 1' (eth1) as default for IPv4 routing and DNS
Jul 31 21:22:38 Host NetworkManager[792]: <info> [1533086558.3497] device (eth1): Activation: successful, device activated.
Jul 31 21:22:38 Host nm-dispatcher[1017]: req:3 'up' [eth1]: new request (0 scripts)
# systemctl status NetworkManager.service
● NetworkManager.service - Network Manager
Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; vendor preset: disabled)
Drop-In: /usr/lib/systemd/system/NetworkManager.service.d
└─NetworkManager-ovs.conf
Active: active (running) since Tue 2018-07-31 21:22:33 EDT; 42min ago
Docs: man:NetworkManager(8)
Main PID: 792 (NetworkManager)
Tasks: 3 (limit: 4915)
Memory: 33.4M
CGroup: /system.slice/NetworkManager.service
└─792 /usr/bin/NetworkManager --no-daemon
Jul 31 22:00:59 Host NetworkManager[792]: <info> [1533088859.6259] dhcp4 (eth1): gateway 192.168.0.1
Jul 31 22:00:59 Host NetworkManager[792]: <info> [1533088859.6334] dhcp4 (eth1): state changed bound -> bound
Jul 31 22:03:12 Host NetworkManager[792]: <info> [1533088992.7755] dhcp4 (eth1): address 192.168.0.237
Jul 31 22:03:12 Host NetworkManager[792]: <info> [1533088992.7756] dhcp4 (eth1): plen 24
Jul 31 22:03:12 Host NetworkManager[792]: <info> [1533088992.7756] dhcp4 (eth1): expires in 300 seconds
Jul 31 22:03:12 Host NetworkManager[792]: <info> [1533088992.7757] dhcp4 (eth1): nameserver '192.168.0.1'
Jul 31 22:03:12 Host NetworkManager[792]: <info> [1533088992.7758] dhcp4 (eth1): domain name 'oaks'
Jul 31 22:03:12 Host NetworkManager[792]: <info> [1533088992.7758] dhcp4 (eth1): hostname 'Host'
Jul 31 22:03:12 Host NetworkManager[792]: <info> [1533088992.7759] dhcp4 (eth1): gateway 192.168.0.1
Jul 31 22:03:12 Host NetworkManager[792]: <info> [1533088992.7769] dhcp4 (eth1): state changed bound -> bound
# systemctl status share1.mount
● share1.mount - /share1
Loaded: loaded (/etc/fstab; generated)
Active: failed (Result: exit-code) since Tue 2018-07-31 21:22:34 EDT; 25min ago
Where: /share1
What: server:/share1/
Docs: man:fstab(5)
man:systemd-fstab-generator(8)
Jul 31 21:22:33 Host systemd[1]: Mounting /share1...
Jul 31 21:22:34 Host mount[880]: mount.nfs: Resource temporarily unavailable
Jul 31 21:22:34 Host systemd[1]: share1.mount: Mount process exited, code=exited status=32
Jul 31 21:22:34 Host systemd[1]: share1.mount: Failed with result 'exit-code'.
Jul 31 21:22:34 Host systemd[1]: Failed to mount /share1.
# cat /usr/lib/systemd/system/NetworkManager.service
[Unit]
Description=Network Manager
Documentation=man:NetworkManager(8)
Wants=network.target
After=network-pre.target dbus.service
Before=network.target
[Service]
Type=dbus
BusName=org.freedesktop.NetworkManager
ExecReload=/usr/bin/dbus-send --print-reply --system --type=method_call --dest=org.freedesktop.NetworkManager /org/freedesktop/NetworkManager org.freedesktop.NetworkManager.Reload uint32:0
#ExecReload=/bin/kill -HUP $MAINPID
ExecStart=/usr/bin/NetworkManager --no-daemon
Restart=on-failure
# NM doesn't want systemd to kill its children for it
KillMode=process
CapabilityBoundingSet=CAP_NET_ADMIN CAP_DAC_OVERRIDE CAP_NET_RAW CAP_NET_BIND_SERVICE CAP_SETGID CAP_SETUID CAP_SYS_MODULE CAP_AUDIT_WRITE CAP_KILL CAP_SYS_CHROOT
# ibft settings plugin calls iscsiadm which needs CAP_SYS_ADMIN
#CapabilityBoundingSet=CAP_SYS_ADMIN
ProtectSystem=true
ProtectHome=read-only
[Install]
WantedBy=multi-user.target
Alias=dbus-org.freedesktop.NetworkManager.service
Also=NetworkManager-dispatcher.service
# We want to enable NetworkManager-wait-online.service whenever this service
# is enabled. NetworkManager-wait-online.service has
# WantedBy=network-online.target, so enabling it only has an effect if
# network-online.target itself is enabled or pulled in by some other unit.
Also=NetworkManager-wait-online.service
# cat /usr/lib/systemd/system/NetworkManager.service.d/NetworkManager-ovs.conf
[Unit]
After=openvswitch.service
# cat /etc/NetworkManager/NetworkManager.conf
# Configuration file for NetworkManager.
# See "man 5 NetworkManager.conf" for details.
# tree /etc/NetworkManager/conf.d/
/etc/NetworkManager/conf.d/
0 directories, 0 files
# cat /usr/lib/systemd/system/NetworkManager-wait-online.service
[Unit]
Description=Network Manager Wait Online
Documentation=man:nm-online(1)
Requires=NetworkManager.service
After=NetworkManager.service
Before=network-online.target
[Service]
Type=oneshot
ExecStart=/usr/bin/nm-online -s -q --timeout=30
RemainAfterExit=yes
[Install]
WantedBy=network-online.target
Arch Linux 4.17.11-Arch1 #1 SMP PREEMPT Sun Jul 29 10:11:16 UTC 2018 x86_64 GNU/Linux
KDE
更新：fstabに関して要求される情報は次のとおりです。
すべてのnfsマウントには次のオプションがあります。
nfs _netdev,defaults,noatime,nodiratime,soft,retrans=6,timeo=20,retry=0,rsize=32768,wsize=32768,proto=tcp 0 0
私は確かにsystemdと共に_netdevを使用しています。フィリッペブランデンブルガーのコメントを読んだ後、このオプションがsystemdの下で無意味であるか有害であるかはわかりません。
systemctl cat share1.mount
# /run/systemd/generator/share1.mount
# Automatically generated by systemd-fstab-generator
[Unit]
SourcePath=/etc/fstab
Documentation=man:fstab(5) man:systemd-fstab-generator(8)
Before=remote-fs.target
[Mount]
Where=/share1
What=server:/share1/
Type=nfs
Options=_netdev,defaults,noatime,nodiratime,soft,retrans=6,timeo=20,retry=0,rsize=32768,wsize=32768,proto=tcp
# systemctl show -p Wants network-online.target
Wants=NetworkManager-wait-online.service
ここに更新があります @sourcejediによって要求された情報
Sudo systemctl list-dependencies share1.mount
share1.mount
● ├─-.mount
● ├─home.mount
● ├─system.slice
● └─network-online.target
Sudo systemctl list-dependencies --after share1.mount
share1.mount
● ├─-.mount
● ├─home.mount
● ├─system.slice
● ├─systemd-journald.socket
● ├─network-online.target
● │ └─network.target
● │ ├─dhcpcd.service
● │ ├─NetworkManager.service
● │ ├─wpa_supplicant.service
● │ └─network-pre.target
● ├─network.target
● │ ├─dhcpcd.service
● │ ├─NetworkManager.service
● │ ├─wpa_supplicant.service
● │ └─network-pre.target
● └─remote-fs-pre.target
# Sudo journalctl -b -u share1.mount -u network-online.target -u NetworkManager-wait-online -u NetworkManager --no-pager
-- Logs begin at Sun 2018-06-10 17:09:08 EDT, end at Sat 2018-12-22 19:07:16 EST. --
Dec 22 17:58:38 laptop1 systemd[1]: Starting Network Manager...
Dec 22 17:58:38 laptop1 NetworkManager[463]: <info> [1545519518.3825] NetworkManager (version 1.14.5dev+17+gba83251bb-1) is starting... (for the first time)
Dec 22 17:58:38 laptop1 NetworkManager[463]: <info> [1545519518.3826] Read config: /etc/NetworkManager/NetworkManager.conf (lib: 20-connectivity.conf)
Dec 22 17:58:38 laptop1 NetworkManager[463]: <info> [1545519518.3836] wifi-nl80211: (wlan0): using nl80211 for WiFi device control
Dec 22 17:58:38 laptop1 NetworkManager[463]: <info> [1545519518.3895] bus-manager: acquired D-Bus service "org.freedesktop.NetworkManager"
Dec 22 17:58:38 laptop1 systemd[1]: Started Network Manager.
Dec 22 17:58:38 laptop1 NetworkManager[463]: <info> [1545519518.3900] manager[0x55b8543f4060]: monitoring kernel firmware directory '/lib/firmware'.
Dec 22 17:58:38 laptop1 systemd[1]: Reached target Network is Online.
Dec 22 17:58:38 laptop1 systemd[1]: share1.mount: Directory /share1 to mount over is not empty, mounting anyway.
Dec 22 17:58:38 laptop1 systemd[1]: Mounting /share1...
Dec 22 17:58:39 laptop1 mount[546]: mount.nfs: Network is unreachable
Dec 22 17:58:39 laptop1 systemd[1]: share1.mount: Mount process exited, code=exited status=32
Dec 22 17:58:39 laptop1 systemd[1]: share1.mount: Failed with result 'exit-code'.
Dec 22 17:58:39 laptop1 systemd[1]: Failed to mount /share1.
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.3695] hostname: hostname: using hostnamed
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.3696] hostname: hostname changed from (none) to "laptop1"
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.3698] dns-mgr[0x98059644079A]: init: dns=default, rc-manager=symlink
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.3708] rfkill2: found WiFi radio killswitch (at /sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/ieee80211/phy0/rfkill2) (driver iwlwifi)
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.3711] manager[0x55b8543f4060]: rfkill: WiFi hardware radio set disabled
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.3711] manager[0x55b8543f4060]: rfkill: WWAN hardware radio set enabled
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.3926] settings: Loaded settings plugin: NMSKeyfilePlugin (internal)
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.3933] settings: Loaded settings plugin: NMSIbftPlugin ("/usr/lib/NetworkManager/1.14.5dev+17+gba83251bb-1/libnm-settings-plugin-ibft.so")
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.3958] keyfile: new connection /etc/NetworkManager/system-connections/USB Ethernet Adapter 1 (fc9310,"USB Ethernet Adapter 1")
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.3975] keyfile: new connection /etc/NetworkManager/system-connections/walden2
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.3983] keyfile: new connection /etc/NetworkManager/system-connections/NETGEAR4
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.3991] keyfile: new connection /etc/NetworkManager/system-connections/Tls5
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.3999] keyfile: new connection /etc/NetworkManager/system-connections/JONES
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4062] manager: rfkill: WiFi disabled by radio killswitch; disabled by state file
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4063] manager: rfkill: WWAN enabled by radio killswitch; enabled by state file
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4064] manager: Networking is enabled by state file
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4066] dhcp-init: Using DHCP client 'internal'
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4129] Loaded device plugin: NMAtmManager (/usr/lib/NetworkManager/1.14.5dev+17+gba83251bb-1/libnm-device-plugin-adsl.so)
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4210] Loaded device plugin: NMBluezManager (/usr/lib/NetworkManager/1.14.5dev+17+gba83251bb-1/libnm-device-plugin-bluetooth.so)
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4232] Loaded device plugin: NMOvsFactory (/usr/lib/NetworkManager/1.14.5dev+17+gba83251bb-1/libnm-device-plugin-ovs.so)
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4404] Loaded device plugin: NMTeamFactory (/usr/lib/NetworkManager/1.14.5dev+17+gba83251bb-1/libnm-device-plugin-team.so)
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4420] Loaded device plugin: NMWifiFactory (/usr/lib/NetworkManager/1.14.5dev+17+gba83251bb-1/libnm-device-plugin-wifi.so)
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4427] Loaded device plugin: NMWwanFactory (/usr/lib/NetworkManager/1.14.5dev+17+gba83251bb-1/libnm-device-plugin-wwan.so)
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4435] device (lo): carrier: link connected
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4439] manager: (lo): new Generic device (/org/freedesktop/NetworkManager/Devices/1)
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4449] manager: (eth0): new Ethernet device (/org/freedesktop/NetworkManager/Devices/2)
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4461] device (eth0): state change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external')
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4481] manager: (eth1): new Ethernet device (/org/freedesktop/NetworkManager/Devices/3)
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4491] device (eth1): state change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external')
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4504] device (wlan0): driver supports Access Point (AP) mode
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4508] manager: (wlan0): new 802.11 WiFi device (/org/freedesktop/NetworkManager/Devices/4)
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4513] device (wlan0): state change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external')
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4516] device (wlan0): set-hw-addr: set MAC address to 28:ab:29:45:F9:2B (scanning)
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4586] bluez: use BlueZ version 5
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.4656] bluez5: NAP: added interface 77:ab:29:45:F9:2F
Dec 22 17:58:39 laptop1 NetworkManager[463]: <info> [1545519519.5063] supplicant: wpa_supplicant running
Dec 22 17:58:42 laptop1 NetworkManager[463]: <info> [1545519522.0759] device (eth1): carrier: link connected
Dec 22 17:58:42 laptop1 NetworkManager[463]: <info> [1545519522.0792] device (eth1): state change: unavailable -> disconnected (reason 'carrier-changed', sys-iface-state: 'managed')
Dec 22 17:58:42 laptop1 NetworkManager[463]: <info> [1545519522.0798] policy: auto-activating connection 'USB Ethernet Adapter 1' (fc9310)
Dec 22 17:58:42 laptop1 NetworkManager[463]: <info> [1545519522.0804] device (eth1): Activation: starting connection 'USB Ethernet Adapter 1' (fc9310)
Dec 22 17:58:42 laptop1 NetworkManager[463]: <info> [1545519522.0806] device (eth1): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
Dec 22 17:58:42 laptop1 NetworkManager[463]: <info> [1545519522.0810] manager: NetworkManager state is now CONNECTING
Dec 22 17:58:42 laptop1 NetworkManager[463]: <info> [1545519522.0895] device (eth1): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
Dec 22 17:58:42 laptop1 NetworkManager[463]: <info> [1545519522.0899] device (eth1): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
Dec 22 17:58:42 laptop1 NetworkManager[463]: <info> [1545519522.0902] dhcp4 (eth1): activation: beginning transaction (timeout in 45 seconds)
Dec 22 17:58:45 laptop1 NetworkManager[463]: <info> [1545519525.7908] device (eth1): carrier: link connected
Dec 22 17:58:47 laptop1 NetworkManager[463]: <info> [1545519527.1025] dhcp4 (eth1): address 192.168.5.2
Dec 22 17:58:47 laptop1 NetworkManager[463]: <info> [1545519527.1026] dhcp4 (eth1): plen 24
Dec 22 17:58:47 laptop1 NetworkManager[463]: <info> [1545519527.1026] dhcp4 (eth1): expires in 108000 seconds
Dec 22 17:58:47 laptop1 NetworkManager[463]: <info> [1545519527.1027] dhcp4 (eth1): nameserver '192.168.5.1'
Dec 22 17:58:47 laptop1 NetworkManager[463]: <info> [1545519527.1027] dhcp4 (eth1): domain name 'wrkgrp'
Dec 22 17:58:47 laptop1 NetworkManager[463]: <info> [1545519527.1027] dhcp4 (eth1): hostname 'usb_laptop1'
Dec 22 17:58:47 laptop1 NetworkManager[463]: <info> [1545519527.1028] dhcp4 (eth1): gateway 192.168.5.1
Dec 22 17:58:47 laptop1 NetworkManager[463]: <info> [1545519527.1040] dhcp4 (eth1): state changed unknown -> bound
Dec 22 17:58:47 laptop1 NetworkManager[463]: <info> [1545519527.1075] device (eth1): state change: ip-config -> ip-check (reason 'none', sys-iface-state: 'managed')
Dec 22 17:58:47 laptop1 NetworkManager[463]: <info> [1545519527.1108] device (eth1): state change: ip-check -> secondaries (reason 'none', sys-iface-state: 'managed')
Dec 22 17:58:47 laptop1 NetworkManager[463]: <info> [1545519527.1117] device (eth1): state change: secondaries -> activated (reason 'none', sys-iface-state: 'managed')
Dec 22 17:58:47 laptop1 NetworkManager[463]: <info> [1545519527.1134] manager: NetworkManager state is now CONNECTED_LOCAL
Dec 22 17:58:47 laptop1 NetworkManager[463]: <info> [1545519527.1153] manager: NetworkManager state is now CONNECTED_SITE
Dec 22 17:58:47 laptop1 NetworkManager[463]: <info> [1545519527.1155] policy: set 'USB Ethernet Adapter 1' (eth1) as default for IPv4 routing and DNS
Dec 22 17:58:47 laptop1 NetworkManager[463]: <info> [1545519527.1161] device (eth1): Activation: successful, device activated.
Dec 22 17:58:47 laptop1 NetworkManager[463]: <info> [1545519527.1167] manager: startup complete
Dec 22 17:58:47 laptop1 NetworkManager[463]: <info> [1545519527.3936] manager: NetworkManager state is now CONNECTED_GLOBAL
（論争の的になっているsoftマウントオプションの使用に関して、hardオプションに関する長年の問題の後、それを使用する決定が行われました。ハードオプションを使用すると、接続が失われると、システムとハードリスタートを強制します。私はBTRFSを実行していて、それを危険にさらしたくありません。自分のsoftが自分の状況により適していると判断しました。ただし、soft retrans、timeo、retryオプションを微調整しました。それらが最適化されているかどうかはわかりませんが、全体的なエクスペリエンスはhardオプションを使用するよりもはるかに優れています。）
これは私にとってsystemdで動作します。 automount、requiresは、ネットワークがオンラインになるまでマウント要求を遅らせます。
nofailについてはわかりません。私は問題なくそれを使いますが、それは完全に正しくないようです。 requiresでは不要です。おそらく誰かがアイデアを持っています。
10.0.0.110:/export/3T /mnt/3T nfs nofail,x-systemd.automount,x-systemd.requires=network-online.target,x-systemd.device-ut=10 0 0
CentOS 7では、ネットワークファイルシステムのマウントはnetwork-online.targetに依存します。
インターフェイスが起動し、IPが設定されると、network-online.targetに到達します。
これは、起動する最初のインターフェイスの最初のIPが、ホスト名を復元するのに十分であることを前提としています。ただし、そうである必要はありません。
systemd servicesと記述して、ネットワークに「up」のフラグが付けられているかどうかをテストし、network-online.targetそのサービスに依存。
テンプレートについては、次を参照してください： https://gitlab.com/ggeurts/extend-network-online.target
/etc/fstabに存在するファイルシステムをマウントする前にネットワークサービスが開始されていない場合、ファイルに存在するNFSマウントポイントはマウントに失敗します。このため、_netdevにNFSファイルシステムの/etc/fstabオプションを追加することをお勧めします
フォローしてみる
mount -a -t nfs,nfs4 -O no_netdev
これに加えて、unix.stackexchange.comからこの回答をチェックアウトすることもできます： / etc/fstabの_netdevマウントオプションはどのように機能しますか？