Hi! I am trying to set up a wireguard client in docker. I use the linuxserver image, I it running in server mode on a different machine (exactly the same ubuntu version) and i can login with my laptop to the wireguard server, but the docker wg-client has problems, i hope someone has an idea :)

The client docker container has trouble starting and throws this error: [___](modprobe: FATAL: Module ip6_tables not found in directory /lib/modules/6.8.0-47-generic ip6tables-restore v1.8.10 (legacy): ip6tables-restore: unable to initialize table 'raw' Error occurred at line: 1 Try 'ip6tables-restore -h' or 'ip6tables-restore --help' for more information. )

I copied the config to the server with the wg server running, it has the same problem with the client. I can ping google.com from inside the server container, but not from inside the client container. Here is the output of the ‘route’ cmd from the client:Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 172.18.0.0 * 255.255.0.0 U 0 0 0 eth0

I searched for a solution quite a bit, but cant seem to find something that works. changed the .yml compose file according to some suggestions but without success.

I tried to install the missing module but could not get it working.

Its a completely clean install of ubuntu 24.04.1 LTS, Kernel: Linux 6.8.0-47-generic.

here is the compose file, in case its needed, it should be exact same one as provided by linux-server in their github:

compose file: 
services:
  wireguard:
    image: lscr.io/linuxserver/wireguard:latest
    container_name: wireguard-client
    cap_add:
      - NET_ADMIN
      - SYS_MODULE #optional
    environment:
      - PUID=1000
      - PGID=1000
      - TZ=Europe/Berlin
#      - SERVERURL=wireguard.domain.com #optional
#      - SERVERPORT=51820 #optional
#      - PEERS=1 #optional
#      - PEERDNS=auto #optional
#      - INTERNAL_SUBNET=10.13.13.0 #optional
#      - ALLOWEDIPS=0.0.0.0/0 #optional
#      - PERSISTENTKEEPALIVE_PEERS= #optional
#      - LOG_CONFS=true #optional
    volumes:
      - /srv/wireguard/config:/config
#      - /lib/modules:/lib/modules #optional
    ports:
      - 51820:51820/udp
    sysctls:
      - net.ipv4.conf.all.src_valid_mark=1
    restart: unless-stopped

here is the complete error log from the wg-client docker:

error 
[migrations] started
[migrations] no migrations found
usermod: no changes
───────────────────────────────────────

      ██╗     ███████╗██╗ ██████╗
      ██║     ██╔════╝██║██╔═══██╗
      ██║     ███████╗██║██║   ██║
      ██║     ╚════██║██║██║   ██║
      ███████╗███████║██║╚██████╔╝
      ╚══════╝╚══════╝╚═╝ ╚═════╝

   Brought to you by linuxserver.io
───────────────────────────────────────

To support the app dev(s) visit:
WireGuard: https://www.wireguard.com/donations/

To support LSIO projects visit:
https://www.linuxserver.io/donate/

───────────────────────────────────────
GID/UID
───────────────────────────────────────

User UID:    1000
User GID:    1000
───────────────────────────────────────
Linuxserver.io version: 1.0.20210914-r4-ls55
Build-date: 2024-10-10T11:23:38+00:00
───────────────────────────────────────
    
Uname info: Linux ec3813b50277 6.8.0-47-generic #47-Ubuntu SMP PREEMPT_DYNAMIC Fri Sep 27 21:40:26 UTC 2024 x86_64 GNU/Linux
**** It seems the wireguard module is already active. Skipping kernel header install and module compilation. ****
**** Client mode selected. ****
[custom-init] No custom files found, skipping...
**** Disabling CoreDNS ****
**** Found WG conf /config/wg_confs/peer1.conf, adding to list ****
**** Activating tunnel /config/wg_confs/peer1.conf ****
[#] ip link add peer1 type wireguard
[#] wg setconf peer1 /dev/fd/63
[#] ip -4 address add 10.13.13.2 dev peer1
[#] ip link set mtu 1420 up dev peer1
[#] resolvconf -a peer1 -m 0 -x
s6-rc: fatal: unable to take locks: Resource busy
[#] wg set peer1 fwmark 51820
[#] ip -6 route add ::/0 dev peer1 table 51820
[#] ip -6 rule add not fwmark 51820 table 51820
[#] ip -6 rule add table main suppress_prefixlength 0
[#] ip6tables-restore -n
modprobe: FATAL: Module ip6_tables not found in directory /lib/modules/6.8.0-47-generic
ip6tables-restore v1.8.10 (legacy): ip6tables-restore: unable to initialize table 'raw'
Error occurred at line: 1
Try `ip6tables-restore -h' or 'ip6tables-restore --help' for more information.
[#] resolvconf -d peer1 -f
s6-rc: fatal: unable to take locks: Resource busy
[#] ip -6 rule delete table 51820
[#] ip -6 rule delete table main suppress_prefixlength 0
[#] ip link delete dev peer1
**** Tunnel /config/wg_confs/peer1.conf failed, will stop all others! ****
**** All tunnels are now down. Please fix the tunnel config /config/wg_confs/peer1.conf and restart the container ****
[ls.io-init] done.

Thanks a lot. I appreciate every input!