uts_namespaces − overview of Linux UTS namespaces

UTS namespaces provide isolation of two system identifiers:
the hostname and the NIS domain name.  These identifiers are
set using and and can be retrieved using and Changes made to
these identifiers are visible to all other processes in the
same UTS namespace, but are not visible to processes in
other UTS namespaces.

     When a process creates a new UTS namespace using or
with the flag, the hostname and domain of the new UTS
namespace are copied from the corresponding values in the
caller’s UTS namespace.

     Use of UTS namespaces requires a kernel that is
configured with the CONFIG_UTS_NS option.

This page is part of release 5.07 of the Linux man‐pages
project.  A description of the project, information about
reporting bugs, and the latest version of this page, can be
found at https://www.kernel.org/doc/man−pages/.