Sample Docker-compose file which shows how to set up Sonarr, Radarr, Prowlarr, Lidarr, QBittorrent and a VPN container so that all all traffic from the containers is routed through the VPN. Also includes Plex and get_iplayer containers, which are not routed through the VPN.

docker-compose.yml

# Docker compose to set up containers for all services you need:
# VPN
#   Sonarr, Radarr, Lidarr, Qbittorrent
# Non-VPN
#   Plex, get_iplayer
# Before running docker-compose, you should pre-create all of the following folders.
# Folders for Docker State:
#  /volume1/dockerdata.             - root where this docker-compose.yml should live
#  /volume1/dockerdata/plex         - Plex config and DB
#  /volume1/dockerdata/sonarr       - Sonarr config and DB
#  /volume1/dockerdata/radarr       - Radarr config and DB
#  /volume1/dockerdata/lidarr       - Lidarr config and DB
#  /volume1/dockerdata/qbt          - QBitorrent config and DB
#  /volume1/dockerdata/prowlarr     - Prowlarr config and DB
#  /volume1/dockerdata/get_iplayer  - Get_iPlayer config and DB
# Folders for Media etc:
#  /volume1/photo                   - Root storage for photo files
#  /volume1/music                   - Root storage for music files
#  /volume1/video                   - Root storage for video files
#  /volume1/video/TV                - folder for Sonarr/Plex TV shows
#  /volume1/video/Films             - folder for Radarr/Plex Movies
#  /volume1/video/Downloads         - QBT folder for TV downloads (that Sonarr will process)
#  /volume1/video/FilmDownloads     - QBT folder for Movie downloads (that Radarr will process)
#  /volume1/video/MusicDownloads    - QBT folder for Music downloads (that Lidarr will process)
#  /volume1/video/Downloads/iPlayer - Destination folder for get_iplayer. See https://github.com/Webreaper/SonarrAutoImport
# 
# Note that Sonarr and Radarr don't necessarily need the VPN if you're using Prowlarr for the indexers. 
# But Prowlarr should be behind the VPN to avoid ISPs that block indexers.

version: "2"
services:
    expressvpn:
        image: polkaned/expressvpn
        container_name: expressvpn
        environment:
            - ACTIVATION_CODE=YOUR_CODE_HERE
        cap_add:
            - NET_ADMIN
        devices:
            - "/dev/net/tun:/dev/net/tun"
        privileged: true
        tty: true
        ports:
            # QBT UI Port
            - 8090:8090
            # Bittorrent port
            - 6881:6881
            - 6881:6881/udp
            # Web port
            - 8080:8080
            - 9117:9117
            # Sonarr port
            - 8989:8989
            # Radarr port
            - 7878:7878
            # Lidarr port
            - 8686:8686
            # Prowlarr port
            - 9696:9696
        command: /bin/bash
        restart: unless-stopped

    qbittorrent:
        image: linuxserver/qbittorrent
        container_name: qbittorrent
        environment:
            - PUID=1024
            - PGID=101
            - TZ=Europe/London
            - UMASK_SET=022
            - WEBUI_PORT=8090
        volumes:
            - /volume1/dockerdata/qbt/config:/config
            - /volume1/video/Seeding:/downloads
            - /volume1/video/Downloads:/tvdownloads 
            - /volume1/video/FilmDownloads:/filmdownloads 
            - /volume1/video/MusicDownloads:/musicdownloads
        network_mode: service:expressvpn
        restart: unless-stopped

    prowlarr:
        image: linuxserver/prowlarr:develop
        container_name: prowlarr
        environment:
            - PUID=1024
            - PGID=101
            - TZ=GB
        volumes:
            - /volume1/dockerdata/prowlarr:/config
        restart: unless-stopped
        network_mode: service:expressvpn
        depends_on:
            - expressvpn
            - qbittorrent
            
    sonarr:
        image: linuxserver/sonarr:latest
        container_name: sonarr_v3
        environment:
            - PUID=1024
            - PGID=101
            - TZ=GB
        volumes:
            - /etc/localtime:/etc/localtime:ro
            - /volume1/dockerdata/sonarr/config:/config
            - /volume1/video/TV:/tv
            - /volume1/video/Downloads:/downloads
        restart: unless-stopped
        network_mode: service:expressvpn
        depends_on:
            - prowlarr
            - qbittorrent

    radarr:
        image: linuxserver/radarr:latest
        container_name: radarr_v3
        environment:
            - PUID=1024
            - PGID=101
            - TZ=GB
        volumes:
            - /etc/localtime:/etc/localtime:ro
            - /volume1/dockerdata/radarr3/config:/config
            - /volume1/video/Films:/movies
            - /volume1/video/FilmDownloads:/downloads
        restart: unless-stopped
        network_mode: service:expressvpn
        depends_on:
            - prowlarr
            - qbittorrent

    lidarr:
        image: linuxserver/lidarr
        container_name: lidarr
        environment:
            - PUID=1024
            - PGID=101
            - TZ=GB
        volumes:
            - /etc/localtime:/etc/localtime:ro
            - /volume1/dockerdata/lidarr/config:/config
            - /volume1/music:/music
            - /volume1/video/MusicDownloads:/downloads
        restart: unless-stopped
        network_mode: service:expressvpn
        depends_on:
            - prowlarr
            - qbittorrent
    plex:
        container_name: plex
        image: linuxserver/plex
        devices:
            - /dev/dri:/dev/dri
        privileged: true
        environment:
            PGID: '101'
            PUID: '1024'
            VERSION: docker
        network_mode: host
        restart: unless-stopped
        volumes:
            - /volume1/dockerdata/plex:/config:rw
            - /volume1/video/TV:/tv:rw
            - /volume1/video/Films:/movies:rw
            - /volume1/music:/music:rw
    get_player:
        container_name: get_iplayer
        image: kolonuk/get_iplayer
        environment:
            PGID: '101'
            PUID: '1024'
        ports:
            - 8181:8181/tcp
        restart: unless-stopped
        volumes:
            - /etc/localtime:/etc/localtime:ro
            - /volume1/dockerdata/get_iplayer:/root/.get_iplayer:rw
            - /volume1/video/Downloads/iPlayer:/root/output:rw           

@vnl this should work just fine for nordVPN

  vpn:
    image: qmcgaw/gluetun
    container_name: vpn
    cap_add:
      - NET_ADMIN
    ports:
      - 8888:8888/tcp # HTTP proxy
      - 8388:8388/tcp # Shadowsocks
      - 8388:8388/udp # Shadowsocks
      - 8090:8090 # qbittorrent Web UI
      - 6881:6881 # qbittorrent
      - 6881:6881/udp # qbittorrent
      - 8389:8389/udp # Gluetun-Shadowsocks?
      - 8389:8389/tcp # Gluetun-Shadowsocks?
      - 8889:8889/tcp # Gluetun
      - 9696:9696 # prowlarr
      - 9117:9117
      - 8080:8080
      - 8989:8989 # sonarr
      - 7878:7878 # radarr
      - 8686:8686 # lidarr
    volumes:
      - /volume1/docker/gluetun:/gluetun
    environment:
      - VPNSP=nordvpn
      - OPENVPN_USER=abc
      - OPENVPN_PASSWORD=abc
      - REGION=Netherlands
      # Timezone for accurate log times
      - TZ=Europe/London
    restart: unless-stopped

Is anyone having problems with their vpn not connecting to servers? All i did was update my expressvpn... It starts, but says cant connect to smart location.

There's a few issues with https://github.com/Misioslav/expressvpn/issues?q=is%3Aissue+ so you might need to switch to another container.

My VPN connects fine, I am able to see my external IP on the expressvpn container, which geolocates where I would expect.

root@:/# curl ifconfig.io
xxx.xxx.36.46

However, my connected containers (qBitorrent, Radarr, etc) are not able to resolve DNS, although they are able to ping IP directly.

root@:/# curl ifconfig.io
curl: (6) Could not resolve host: ifconfig.io
root@:/# ping google.com
ping: bad address 'google.com'
root@:/# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: seq=0 ttl=55 time=105.545 ms
64 bytes from 8.8.8.8: seq=1 ttl=55 time=42.904 ms

A portion of my docker-compose.yml

# ExpressVPN - VPN Manager
  expressvpn:
    image: polkaned/expressvpn
    container_name: expressvpn
    environment:
      - ACTIVATION_CODE=<code>
    cap_add:
      - NET_ADMIN
    devices:
     - "/dev/net/tun:/dev/net/tun"
    privileged: true
    tty: true
    ports:
      - 8090:8090 #qbittorrent WebUI
      - 6881:6881 #qbittorrent Torrent
      - 6881:6881/udp
      - 8091:8080 #WebUI
      - 9117:9117
      - 8989:8989 #Sonarr
      - 7878:7878 #Radarr
      - 8787:8787 #Readarr 
      - 9696:9696 #Prowlarr
    command: /bin/bash
    restart: unless-stopped
# qbittorrent - Torrent Manager
  qbittorrent:
    image: lscr.io/linuxserver/qbittorrent:latest
    container_name: qbittorrent
    environment:
      - PUID=1000
      - PGID=1000
      - TZ=US/Central
      - WEBUI_PORT=8090
      - TORRENTING_PORT=6881
    volumes:
      - ~/qbittorrent/data:/config
      - /downloads:/downloads
    network_mode: service:expressvpn
    restart: unless-stopped

Any thoughts on how to troubleshoot?