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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

Section titled “Preparation - Update the package list”
Terminal window
sudo apt update

Install docker

Section titled “Install docker”
Terminal window
sudo apt -y install docker.io docker-compose

Enable the service to start on boot

Section titled “Enable the service to start on boot”
Terminal window
sudo systemctl enable docker

Start the service

Section titled “Start the service”
Terminal window
sudo systemctl start docker

Check docker status

Section titled “Check docker status”
Terminal window
sudo systemctl status docker

Setting up Docker’s networks

Section titled “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.
Terminal window
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

Section titled “Test the public IP from docker”
Terminal window
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

Section titled “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.

Terminal window
docker compose run --rm test

Reference

Section titled “Reference”