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Install Docker on Synology NAS and Create Docker Network

Install Docker

  1. Install from DSM > Package Center
  2. A /volume1/docker directory is auto-created

Check Docker Versions

Synology uses older Docker:

  • Use docker-compose - not docker compose
  • Compose files must be version: '2'
  • You cannot update - the move from 2 to 3 is a paradigm shift
docker --version
# Docker version 20.10.3, build 55f0773

docker-compose version
# docker-compose version 1.28.5, build 24fb474e
# docker-py version: 4.4.4
# CPython version: 3.7.10
# OpenSSL version: OpenSSL 1.1.0l  10 Sep 2019

sudo docker info
docker ps

About Docker nas_network

  • The purpose of this network is to avoid port conflicts between the NAS and Docker containers.
  • All Docker containers are added to this network.
  • Each container is given a static IP on this network via its docker-compose.yml.
  • Containers that need to communicate with each other - ie Pi-hole and Unbound - do NOT need a separate bridge.

IMPORTANT All Docker compose files assume this exact network. See Network Reference: Docker nas_network for a running list of containers in this project.

Create nas_network

# Create Network
docker network create --subnet 172.29.7.0/24 --gateway 172.29.7.1 nas_network

# List
docker network ls

# Details
docker network inspect nas_network

Add Container to Network

# Add this to start or end of each docker-compose.yml
networks:
  default:
    name: nas_network

# Assign each container a unique IP
services:
  my-container:
    networks:
      default:
        ipv4_address: 172.29.7.8

Stopping and Starting Containers

TODO

Composerize

Composerize is a free online tool that converts Docker run commands into Compose files.