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$ docker --version
Docker version 19.03.8, build afacb8b7f0

$ docker-compose --version
docker-compose version 1.27.2, build 18f557f

$ sudo -s
sudo$ cat <<EOT >> /etc/docker/daemon2daemon.json
{
  "insecure-registries": ["10.20.6.10:30000"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "10m",
    "max-file": "3"
  },
  "ipv6": true,
  "fixed-cidr-v6": "2001:db8:1::/64"
}
EOT
$ exit

$ sudo systemctl catrestart /etc/docker/daemon.json 
{
  "insecure-registries": ["10.20.6.10:30000"],
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "10m",
    "max-file": "3"
  },
  "ipv6": true,
  "fixed-cidr-v6": "2001:db8:1::/64"
}