Section (7) uts_namespaces
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 sethostname(2) and setdomainname(2), and can be retrieved using uname(2), gethostname(2), and getdomainname(2). 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 clone(2) or unshare(2) with the
CLONE_NEWUTS flag, the hostname
and domain of the new UTS namespace are copied from the
corresponding values in the caller_zsingle_quotesz_s UTS namespace.
Use of UTS namespaces requires a kernel that is configured
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