儘管配置了 IP 地址，但 NFS 安裝在引導時失敗

我正在嘗試在啟動時在 Raspberry Pi 4 上掛載我的 NFS 共享。它不起作用並且 systemd 抱怨網路無法訪問。手動安裝每個共享按預期工作。我現在嘗試了不同的東西。我沒有使用systemd/etc/fstab服務來安裝卷，如下所示：

[Unit]
Description=Mount NFS share Music
After=network-online.target
Wants=network-online.target

[Mount]
What=10.5.0.34:/music
Where=home/pi/media_storage/music
Options=auto
Type=nfs
TimeoutSec=60

[Install]
WantedBy=remote-fs.target

這兩項服務systemd-networkd.service都已systemd-networkd-wait-online.service啟用。這是journalctl輸出：

Nov 30 16:30:46 NextcloudPi dhcpcd[383]: eth0: IAID 32:23:48:46
Nov 30 16:30:46 NextcloudPi dhcpcd[383]: eth0: adding address fe80::9819:5d1a:3c86:8b41
Nov 30 16:30:46 NextcloudPi dhcpcd[383]: eth0: rebinding lease of 10.5.0.43
Nov 30 16:30:46 NextcloudPi dhcpcd[383]: eth0: probing address 10.5.0.43/24
Nov 30 16:30:46 NextcloudPi dhcpcd[383]: eth0: soliciting an IPv6 router
Nov 30 16:30:47 NextcloudPi systemd-networkd[152]: eth0: Gained IPv6LL
Nov 30 16:30:47 NextcloudPi systemd-timesyncd[281]: Network configuration changed, trying to establish connection.
Nov 30 16:30:47 NextcloudPi systemd-networkd-wait-online[183]: ignoring: lo
Nov 30 16:30:47 NextcloudPi systemd[1]: Started Wait for Network to be Configured.
Nov 30 16:30:47 NextcloudPi systemd[1]: Reached target Network is Online.
Nov 30 16:30:48 NextcloudPi systemd[1]: Mounting Mount NFS share Music...
Nov 30 16:30:48 NextcloudPi systemd[1]: Started /etc/rc.local Compatibility.
Nov 30 16:30:48 NextcloudPi mount[498]: mount.nfs: Network is unreachable
Nov 30 16:30:48 NextcloudPi systemd[1]: mnt-music.mount: Mount process exited, code=exited, status=32/n/a
Nov 30 16:30:48 NextcloudPi systemd[1]: mnt-music.mount: Failed with result 'exit-code'.
Nov 30 16:30:48 NextcloudPi systemd[1]: Failed to mount Mount NFS share Music.
Nov 30 16:30:48 NextcloudPi systemd[1]: Reached target Remote File Systems.

根據journalctl介面配置並擁有一個有效的IP地址。為什麼還要mount.nfs抱怨？

由於network-online.target似乎已損壞，因此無論我做什麼，我都開發了一種不同且可靠的解決方案。

我創建了一個單一的 systemd 腳本：“ping_barrier”。它會ping NFS 伺服器，直到成功。使WantedBy=nfs-client.targetNFS 等待此服務完成。

[Unit]    
Description=Ping until Success

[Service]
Type=oneshot
ExecStart=/opt/ping_barrier.sh
StandardOutput=journal

[Install]
WantedBy=nfs-client.target

這是循環的 ping 腳本，直到 ping 命令成功：

#!/bin/bash    
printf "%s" "waiting for FileServer ..."
while ! ping -c 1 -n -w 1 10.5.0.34 &> /dev/null
do
   printf "%c" "."
done
printf "\n%s\n"  "Server is back online"

引用自：https://unix.stackexchange.com/questions/554961