我有一个 systemd 服务，它运行一个检查我的wireguard 连接的脚本。服务文件如下所示：
[Unit]
Description=Check the wg status and restart it if necessary
After=network-online.target
Wants=network-online.target
[Service]
ExecStart=/home/checkwg.sh
[Install]
WantedBy=multi-user.target
该脚本checkwg.sh如下所示：
#!/bin/bash
wgout=$(wg show)
if [[ ! -n $wgout ]] # check to see if there is an active wg connection
then
echo "wg appears down, reactivating..."
wg-quick up myvpn # This line throws "Temporary failure in name resolution"
else
echo "wg is up"
fi
有一个 if 语句检查 wg 是否已启动。如果它没有启动，那么它就会运行wg-quick up myvpn。
当我以 root 身份运行该脚本时（我使用的是 Dietpi，因此只有一个用户 root），该脚本就可以工作。这是输出：
./checkwg.sh
wg appears down, reactivating...
[#] ip link add myvpn type wireguard
[#] wg setconf myvpn /dev/fd/63
[#] ip address add 10.0.4.54 dev myvpn
[#] ip link set mtu 1420 up dev myvpn
[#] ip route add 10.0.0.1/32 dev myvpn
[#] wg set myvpn fwmark 51820
但是当我尝试运行checkwg.service（通过 running systemctl restart checkwg）时，它给了我：
systemctl restart checkwg
journalctl -fu checkwg.service
May 17 10:22:30 camera systemd[1]: Started Check the wg status and restart it if necessary.
May 17 10:22:30 camera checkwg.sh[23181]: wg appears down, reactivating...
May 17 10:22:31 camera checkwg.sh[23181]: [#] ip link add myvpn type wireguard
May 17 10:22:31 camera checkwg.sh[23181]: [#] wg setconf myvpn /dev/fd/63
May 17 10:22:31 camera checkwg.sh[23181]: Temporary failure in name resolution: `myvpn.myhost.com:5555'. Trying again in 1.50 seconds...
May 17 10:22:32 camera checkwg.sh[23181]: Temporary failure in name resolution: `myvpn.myhost.com:5555'. Trying again in 2.25 seconds...
May 17 10:22:34 camera checkwg.sh[23181]: Temporary failure in name resolution: `myvpn.myhost.com:5555'. Trying again in 3.38 seconds...
为什么 systemd 无法解析我的主机，但 root 用户却可以？我相当有信心这不是wireguard问题，因为当我用wg-quick up myvpn它替换时ping google.com会引发相同的错误：Temporary failure in name resolution
答案1
系统升级（到 Fedora 38）后我遇到了同样的问题。通过添加以下内容修复了该问题：
LoadCredential=network.dns
在该[Service]部分下。
干杯，简。