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Install Docker and Enable IPv6 network

This document provides a comprehensive guide for installing Docker and enabling IPv6 networking on a cloud environment platform. It covers the installation process for systems using apt (Debian, Ubuntu) and dnf (CentOS, Rocky Linux, Alma Linux) package managers. By following these steps, you will be able to set up Docker for containerized application deployment and configure it to support IPv6 networking, ensuring compatibility and scalability for modern network environments.

Preparation - Update the package list​

sudo apt update

Install docker​

sudo apt -y install docker.io docker-compose

Enable the service to start on boot​

sudo systemctl enable docker

Start the service​

sudo systemctl start docker

Check docker status​

sudo systemctl status docker

Setting up Docker’s networks​

we are going to use the reserved range of IPv6.

  • 2001:0db8:0000:0001:1000::/68 as the default network range.
  • 2001:0db8:0000:0001:2000::/68 as a default address pool. New networks should use /80 ranges. A /68 range contains 4096 /80 subnets.
cat <<EOF | sudo tee /etc/docker/daemon.json >/dev/null
{
  "ipv6": true,
  "fixed-cidr-v6": "2001:0db8:0000:0001:1000::/68",
  "experimental": true,
  "ip6tables": true,
  "default-address-pools":[
    {"base": "172.31.0.0/16", "size": 24},
    {"base": "2001:0db8:0000:0001:2000::/68", "size": 80}
  ],
  "dns": ["2a00:1098:2c::1", "2a01:4f9:c010:3f02::1", "2a00:1098:2b::1"]
}
EOF

sudo systemctl restart docker

Test the public IP from docker​

docker run --rm alpine wget -qO - https://ifconfig.me && echo ""

it should be show your public IPv6 address

Test the public IP from docker compose​

Make a docker-compose.yaml

services:
  test:
    image: alpine
    command: /bin/sh -c "wget -qO - https://ifconfig.me && echo ''"
networks:
  default:
    enable_ipv6: true

and execute this. It should generates an /80 network. Docker compose creates a default network for each docker compose file.

docker compose run --rm test

Reference​