Docker Configuration

Both docker(1) and dockerd(8) are configured by the same files.

Configuration Files

dockerd(8) is configured primarily with /etc/docker/daemon.json.

IPv6

To enable IPv6, update the configuration file like:

{
  "ipv6": true,
  "fixed-cidr-v6": "2001:db8:1::/64"
}

Logging

By default, dockerd(8) writes logs in JSON format without a limit for storage size. To add log rotation, update the configuration file like:

{
  "log-driver": "json-file",
  "log-opts": {
    "max-size": "1m",
    "max-file": "3"
  }
}

Storage

Images are written to /var/lib/docker by default. To configure this, update the configuration file like:

{
  "data-root": "/path/to/new/data/root"
}

Volumes

Volumes are written to /var/lib/docker/volumes by default. This location follows the data-root set above.

Registries

docker(1) refuses to use an insecure registry, including one using a self-signed certificate. To circumvent this, update the dockerd(8) configuration like:

{
  "insecure-registries": [
    "registry.example.com:8080"
  ]
}

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