umid Directories

umid Directories

By default, the unique machine id, or umid, directory for a UML instance is .uml/<umid> in the home directory of the user running the instance. This directory contains the mconsole socket and the pid file for the instance. If you decide to provide each instance with its own tmpfs mount, as described earlier, this would be a natural place to create it.

For management purposes, you may want to move the umid directories to a different location. For example, you might want to have each UML instance owned by a different user on the host but to have all of their umid directories in a single location. To do this, there is a UML switch that specifies the umid directory:

uml_dir=<umid path>

For instance, putting these switches on the command line for a UML would create its umid directory at /var/run/uml/debian:

umid=debian uml_dir=/var/run/uml