This mod adds docker-in-docker (dind) to Ubuntu and Alpine based images, to be installed/updated during container start. Main advantage is that all docker images, containers, volumes, etc. will reside inside the container and will be sandboxed from the host's docker environment. Main disadvantage is that it requires the container to run with privileged.

How to enable:

In the container's docker arguments,

Set an environment variable DOCKER_MODS=linuxserver/mods:universal-docker-in-docker
Set the privileged option for the container

Docker data root will reside under /config/var/lib/docker.

If adding multiple mods, enter them in an array separated by |, such as DOCKER_MODS=linuxserver/mods:universal-docker-in-docker|linuxserver/mods:universal-mod2