debian setup wireguard-client

Question

I have such an error. What could be the problem?

sudo wg-quick up wg0-client
[#] ip link add wg0-client type wireguard
[#] wg setconf wg0-client /dev/fd/63
[#] ip -4 address add 10.8.0.2/32 dev wg0-client
[#] ip link set mtu 1420 up dev wg0-client
[#] resolvconf -a tun.wg0-client -m 0 -x
Unknown interface 'tun': No such device
[#] ip link delete dev wg0-client

---

I managed to move forward a bit. Reinstalled resolvconf on openresolv:

apt-get --purge remove resolvconf
apt install openresolv

I executed the command the result of which is Active: inactive (dead):

systemctl status systemd-resolved.service

I executed the second command, the result of which was Active: active (running):

systemctl enable systemd-resolved.service
systemctl start systemd-resolved.service

After which the wg client wound up:

sudo wg-quick up wg0-client

But now another problem. When the system boots, wg0-client.service throws an error. This must be done after booting the system:

systemctl restart [e-mail]

Here is the output from the boot log:

grep -i wg /var/log/boot.log
[FAILED] Failed to start WireGuard via wg-quick(8) for wg/client.
See 'systemctl status [e-mail]' for details.

systemctl status [e-mail]:

systemctl status [e-mail]
● [e-mail] - WireGuard via wg-quick(8) for wg/client
   Loaded: loaded (/lib/systemd/system/wg-quick@.service; enabled; vendor preset: enabled)
   Active: **failed** (Result: exit-code) since Tue 2020-06-30 17:10:56 MSK; 2 weeks 1 days ago
     Docs: man:wg-quick(8)
           man:wg(8)
           https://www.wireguard.com/
           https://www.wireguard.com/quickstart/
           https://git.zx2c4.com/wireguard-tools/about/src/man/wg-quick.8
           https://git.zx2c4.com/wireguard-tools/about/src/man/wg.8
 Main PID: 564 (code=exited, status=1/FAILURE)

июн 30 17:10:56 PC systemd[1]: Starting WireGuard via wg-quick(8) for wg/client...
июн 30 17:10:56 PC wg-quick[564]: wg-quick: `/etc/wireguard/wg-client.conf' does not exist
июн 30 17:10:56 PC systemd[1]: [e-mail]: Main process exited, code=exited, status=1/FAILURE
июн 30 17:10:56 PC systemd[1]: [e-mail]: Failed with result 'exit-code'.
июн 30 17:10:56 PC systemd[1]: **Failed to start WireGuard via wg-quick(8) for wg/client**.

But I do not have a configuration file with that name: wg-quick: `/etc/wireguard/wg-client.conf' does not exist

ls /etc/wireguard
client_private.key  client_public.key  wg0-client.conf

---

As a result, the last problem was solved. By mistake, a non-existent interface service was created:

systemctl stop [e-mail]
systemctl disable [e-mail]
systemctl enable [e-mail]
systemctl start [e-mail]


systemctl status [e-mail]
● [e-mail] - WireGuard via wg-quick(8) for wg0/client
   Loaded: loaded (/lib/systemd/system/wg-quick@.service; enabled; vendor preset: enabled)
   Active: active (exited) since Wed 2020-07-15 18:33:52 MSK; 5s ago
     Docs: man:wg-quick(8)
           man:wg(8)
           https://www.wireguard.com/
           https://www.wireguard.com/quickstart/
           https://git.zx2c4.com/wireguard-tools/about/src/man/wg-quick.8
           https://git.zx2c4.com/wireguard-tools/about/src/man/wg.8
  Process: 1544 ExecStart=/usr/bin/wg-quick up wg0-client (code=exited, status=0/SUCCESS)
 Main PID: 1544 (code=exited, status=0/SUCCESS)

июл 15 18:33:52 PC wg-quick[1544]: [#] ip -4 address add 10.8.1.1/32 dev wg0-client
июл 15 18:33:52 PC wg-quick[1544]: [#] ip link set mtu 1420 up dev wg0-client
июл 15 18:33:52 PC wg-quick[1544]: [#] resolvconf -a wg0-client -m 0 -x
июл 15 18:33:52 PC wg-quick[1544]: [#] wg set wg0-client fwmark 51820
июл 15 18:33:52 PC wg-quick[1544]: [#] ip -4 route add 0.0.0.0/0 dev wg0-client table 51820
июл 15 18:33:52 PC wg-quick[1544]: [#] ip -4 rule add not fwmark 51825 table 51825
июл 15 18:33:52 PC wg-quick[1544]: [#] ip -4 rule add table main suppress_prefixlength 0
июл 15 18:33:52 PC wg-quick[1544]: [#] sysctl -q net.ipv4.conf.all.src_valid_mark=1
июл 15 18:33:52 PC wg-quick[1544]: [#] iptables-restore -n
июл 15 18:33:52 PC systemd[1]: Started WireGuard via wg-quick(8) for wg0/client.