Looking at the guide here: https://insights.ubuntu.com/2016/12/08/mounting-your-home-directory-in-lxd
What are the security implications of adding the mappings
echo 'root:1000:1' | sudo tee -a /etc/subuid /etc/subgid and
lxc config set zesty raw.idmap 'both 1000 1000', beyond
zesty having read/write access to paths that I’ve specifically mounted in it? For instance, I do not want the container user to have access to files owned by uid 1000 but outside of specifically mounted paths. I’m guessing there is a reason LXC/LXD doesn’t come with this mapping by default?