post_install() {
	cat <<EOT

=== Post installation message from docker-rootless ===
This is based on https://docs.docker.com/engine/security/rootless/
To Run the Docker daemon as a non-root user (Rootless mode) for ArchLinux, you need to do the following things:

1. configure kernel settings

create '/etc/sysctl.d/99-docker-rootless.conf': 'kernel.unprivileged_userns_clone=1'

and then run: 'sudo sysctl --system'

> see https://docs.docker.com/engine/security/rootless/#distribution-specific-hint for detailed information

2. configure subuid and subgid

and create '/etc/subuid' and '/etc/subgid' with: 'testuser:231072:65536' (for example, 'testuser' is username)

> see https://docs.docker.com/engine/security/userns-remap/#prerequisites for detailed information

3. start and enable user service: 'systemctl --user status|start|stop docker'

4. finally set docker socket environment variable: 'export DOCKER_HOST=unix://\$XDG_RUNTIME_DIR/docker.sock', you can also add it to '~/.bashrc' or somewhere alike
=========

EOT
}