[thirdparty/man-pages.git] / man7 / uts_namespaces.7

.\" Copyright (c) 2019 by Michael Kerrisk <mtk.manpages@gmail.com>
.\"
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.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
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.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date.  The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein.  The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\" %%%LICENSE_END
.\"
.\"
.TH UTS_NAMESPACES 7 2019-08-02 "Linux" "Linux Programmer's Manual"
.SH NAME
namespaces \- overview of Linux UTS namespaces
.SH DESCRIPTION
UTS namespaces provide isolation of two system identifiers:
the hostname and the NIS domain name.
These identifiers are set using
.BR sethostname (2)
and
.BR setdomainname (2),
and can be retrieved using
.BR uname (2),
.BR gethostname (2),
and
.BR getdomainname (2).
.PP
.PP
When a process creates a new UTS namespace using
.BR clone (2)
or
.BR unshare (2)
with the
.BR CLONE_NEWUTS
flag, the hostname and domain of the new UTS namespace are copied
from the corresponding values in the caller's UTS namespace.
.PP
Use of UTS namespaces requires a kernel that is configured with the
.B CONFIG_UTS_NS
option.
.SH SEE ALSO
.BR nsenter (1),
.BR unshare (1),
.BR clone (2),
.BR getdomainname (2),
.BR gethostname (2),
.BR setns (2),
.BR uname (2),
.BR unshare (2),
.BR namespaces (7)
Commit	Line	Data
57829a0e MK	1	.\" Copyright (c) 2019 by Michael Kerrisk <mtk.manpages@gmail.com>
	2	.\"
	3	.\" %%%LICENSE_START(VERBATIM)
	4	.\" Permission is granted to make and distribute verbatim copies of this
	5	.\" manual provided the copyright notice and this permission notice are
	6	.\" preserved on all copies.
	7	.\"
	8	.\" Permission is granted to copy and distribute modified versions of this
	9	.\" manual under the conditions for verbatim copying, provided that the
	10	.\" entire resulting derived work is distributed under the terms of a
	11	.\" permission notice identical to this one.
	12	.\"
	13	.\" Since the Linux kernel and libraries are constantly changing, this
	14	.\" manual page may be incorrect or out-of-date. The author(s) assume no
	15	.\" responsibility for errors or omissions, or for damages resulting from
	16	.\" the use of the information contained herein. The author(s) may not
	17	.\" have taken the same level of care in the production of this manual,
	18	.\" which is licensed free of charge, as they might when working
	19	.\" professionally.
	20	.\"
	21	.\" Formatted or processed versions of this manual, if unaccompanied by
	22	.\" the source, must acknowledge the copyright and authors of this work.
	23	.\" %%%LICENSE_END
	24	.\"
	25	.\"
	26	.TH UTS_NAMESPACES 7 2019-08-02 "Linux" "Linux Programmer's Manual"
	27	.SH NAME
	28	namespaces \- overview of Linux UTS namespaces
	29	.SH DESCRIPTION
	30	UTS namespaces provide isolation of two system identifiers:
	31	the hostname and the NIS domain name.
	32	These identifiers are set using
	33	.BR sethostname (2)
	34	and
	35	.BR setdomainname (2),
	36	and can be retrieved using
	37	.BR uname (2),
	38	.BR gethostname (2),
	39	and
	40	.BR getdomainname (2).
	41	.PP
	42	.PP
	43	When a process creates a new UTS namespace using
	44	.BR clone (2)
	45	or
	46	.BR unshare (2)
	47	with the
	48	.BR CLONE_NEWUTS
	49	flag, the hostname and domain of the new UTS namespace are copied
	50	from the corresponding values in the caller's UTS namespace.
	51	.PP
	52	Use of UTS namespaces requires a kernel that is configured with the
	53	.B CONFIG_UTS_NS
	54	option.
	55	.SH SEE ALSO
	56	.BR nsenter (1),
	57	.BR unshare (1),
	58	.BR clone (2),
252bba44	59	.BR getdomainname (2),
27f942ad	60	.BR gethostname (2),
57829a0e	61	.BR setns (2),
252bba44	62	.BR uname (2),
57829a0e MK	63	.BR unshare (2),
57829a0e MK	64	.BR namespaces (7)