+=== Smallest possible
+----
+# mkdir -p /opt/subhost/copy/{root,work,live}
+# cat << EOF > /opt/subhost/copy/copy.conf
+BASE=.
+EOF
+----
+
+
+This setup has a minimal configuration for a subhost that overlays the
+root filesystem but is without networking. The subhost must be entered
+with *overlay-go*, although the default start might have started sshd
+listening on a loopback interface in the subhost's network namespaces.
+
+Note that *overlay-go* runs a shell within the namespaces, but not as
+a child of the "subhost init" (aka +.reaper+).
+
+=== /opt/subhost/tiny/tiny.conf
+****
+----
+BASE=.
+CABLES= =
+START= none
+LOWER= base
+----
+****
+
+The +tiny+ subhost would be for overlaying a separate +debootstrap+
+root filesystem, without any services (since +START+ is "none"). This
+gets started with a +dummy_service+ to hold the overlay for access via
++overlay-go+. The +dummy_service+ sets up and listens on a pipe at
++/run/dummy_service+, and exits when anything is written to that.
+
+=== /opt/subhost/mta/mta.conf