NextDNS CLI running on Docker

This is a simple Docker image that allows you to containerize your NextDNS CLI client.

Tags will be automatically published under matching versions as upstream releases happen.

Usage

You can pass what you would use with arguments as environment variables to the container. Make sure to prefix all variables with NEXTDNS_, where NEXTDNS_PROFILE=xxxxxx would become -profile=xxxxxx to the CLI.

In addition, in order to support Conditional Profiles and Split Horizon/Conditional Forwarders, you can also use NEXTDNS_PROFILE_$NAME or NEXTDNS_FORWARDER_$NAME to pass additional settings (where $NAME is a personal identifier, and is not passed to the CLI.)

To start it, it's how you would usually do it:

docker pull jedayoshi/nextdns:latest
docker run -d --name nextdns --restart always -p "53:53/tcp" -p "53:53/udp" --env "NEXTDNS_PROFILE=xxxxxx" --env "NEXTDNS_CACHE_SIZE=10m" --env "NEXTDNS_REPORT_CLIENT_INFO=true" jedayoshi/nextdns:latest"

Or, use docker-compose! Here's an example:

version: "3"

services:
  nextdns:
    container_name: "nextdns"
    image: "jedayoshi/nextdns:latest"
    restart: "always"
    ports:
      - "53:53/tcp"
      - "53:53/udp"
    environment:
      NEXTDNS_PROFILE: "xxxxxx"
      NEXTDNS_CACHE_SIZE: "10m"
      NEXTDNS_REPORT_CLIENT_INFO: "true"
    # Warning: This WILL use your DNS query quota. Since its TTL is 300s,
    # each check will be 1 query against your quota every 5 minutes. Enable carefully.
    #healthcheck:
    #  test: [
    #    "CMD", "sh", "-c",
    #    "dig +time=10 @127.0.0.1 -p $$(echo $${NEXTDNS_LISTEN:-:53} | rev | cut -d: -f1 | rev) probe-test.dns.nextdns.io"
    #  ]
    #  interval: "1m"
    #  timeout: "10s"
    #  retries: 1
    #  start_period: "5s"

Why is --use-hosts disabled by default?

Because all what the /etc/hosts from the container contains is your usual stuff plus the container name, and I'd rather avoid conflicts than to risk myself. However, nothing stops you from using NEXTDNS_USE_HOSTS=true and mounting your /etc/hosts from your host system as a volume:

version: "3"

services:
  nextdns:
    container_name: "nextdns"
    image: "jedayoshi/nextdns:latest"
    restart: "always"
    ports:
      - "53:53/tcp"
      - "53:53/udp"
    environment:
      NEXTDNS_PROFILE: "xxxxxx"
      NEXTDNS_PROFILE_HOME: "192.168.0.0/24=aaaaaa"
      NEXTDNS_PROFILE_OFFICE: "10.18.0.0/16=wwwwww"
      NEXTDNS_CACHE_SIZE: "10m"
      NEXTDNS_REPORT_CLIENT_INFO: "true"
      NEXTDNS_USE_HOSTS: "true"
    volumes:
      - "/etc/hosts:/etc/hosts:ro"

License

WTFPL for the docker-entrypoint.sh script, since it's rather minimal.

NextDNS CLI is licensed under the MIT License.