How to Isolate Users with Containers

Option 1: Docker User Namespaces

sudo docker run -it --userns=host ubuntu bash

Option 2: LXC Containers

sudo apt install lxc -y
sudo lxc-create -n isolated-user -t ubuntu
sudo lxc-start -n isolated-user

Option 3: systemd-nspawn

sudo systemd-nspawn -D /srv/container/ubuntu --user=username

Option 4: Chroot with Limited Environment

sudo chroot /path/to/jail /bin/bash