DNS leak when nordlynx is disconnected

[krbrs]

Describe the bug

DNS is leaking when the container starts, can't say if it's the same when the connection drops
Same behavior as mentioned in bubuntux/nordvpn#361
docker-compose was put together from different suggestions on the Wiki

Steps to reproduce

• Start container from docker compose
• See DNS logs and find URLs from Containers called which are behind the nordlynx container until the connection is established

To Reproduce using docker-compose

docker-compose.yml:

version: "3"
services:
  nordvpn:
    container_name: nordvpn
    image: ghcr.io/bubuntux/nordlynx:latest
    pull_policy: always
    cap_add:
      - NET_ADMIN
    restart: unless-stopped
    environment:
      - QUERY=$QUERY
      - NET_LOCAL=$NET_LOCAL
      - ALLOWED_IPS=$ALLOWED_IPS
      - TZ=$TZ
      - PRIVATE_KEY=$PK
#     - DNS=$DNS # commented out as default has changed back to Nord servers
      - "POST_UP=ip -4 route add $$(wg | awk -F'[: ]' '/endpoint/ {print $$5}') via $$(ip route | awk '/default/ {print $$3}')"
      - "PRE_DOWN=ip -4 route del $$(route -n | awk '/255.255.255.255/ {print $$1}') via $$(ip route | awk '/default/ {print $$3}')"
    ports:
      - **ports you need forwarded for behind containers**

I don't think the variables are important for troubleshooting, just set whichever fits your setup

Expected behavior

No DNS leak at all even if nordvpn connection is down.

[krbrs]

So this issue bugged me as I don't want to leak my IP over DNS...

I updated part of my docker-compose.yml for the affected service (not included in the config above) and it seems to at least fix the issue for leaking the IP on start - idk about a leak on connection drop tho:

  *service-name*:
    container_name: *container-name*
    image: *imagename*:latest
    pull_policy: always
    restart: on-failure
    network_mode: service:nordvpn
    volumes:
      - *volume*:*volume*
    environment:
      - PGID=$PGID
      - PUID=$PUID
      - TZ=$TZ
    depends_on:
      nordvpn:
        condition: service_healthy

The last part makes the other container(s) wait on start until the healthcheck of "nordvpn" reports healthy

Still I think this can be addressed elsewhere on nordlynx container start

[Smiggel]

How did you get the service running?

When I add the code below to my containers, I get the error "no such service: nordvpn"

    depends_on:
      nordvpn:
        condition: service_healthy

Tried your stack example, but no luck.

[krbrs]

You just need to make sure the compose version is "3" and that your NordVPN service is called "nordvpn" as in the first comment on that issue - the vpn and other containers are all on the same compose file here. Don't add that dependency to the NordVPN service of course.

[Smiggel]

You just need to make sure the compose version is "3" and that your NordVPN service is called "nordvpn" as in the first comment on that issue - the vpn and other containers are all on the same compose file here. Don't add that dependency to the NordVPN service of course.

Thanks, going to look into it.

[volschin]

@Smiggel condition inside depends_on is not specified in compose v3, only in v2.
https://docs.docker.com/compose/compose-file/compose-file-v2/#depends_on

[krbrs]

Sorry, for me it started this way and containers are waiting. Downgrading to v2.4 should do then.
I am using Portainer so idk if this makes a difference

[Smiggel]

@Smiggel condition inside depends_on is not specified in compose v3, only in v2.
https://docs.docker.com/compose/compose-file/compose-file-v2/#depends_on

Tried it again. But I still have no service called nordvpn. It's not made during setup I guess.

Also see errors in the log:

s6-rc: info: service 99-ci-service-check successfully started
[2022-10-24T18:50:46+02:00] Finding the best server...
curl: (6) Could not resolve host: api.nordvpn.com
[2022-10-24T18:51:14+02:00] Unable to select a server ¯_(⊙︿⊙)_/¯

[github-actions]

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