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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 | |
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| 11 | .\" permission notice identical to this one. | |
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| 13 | .\" Since the Linux kernel and libraries are constantly changing, this | |
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| 25 | .\" | |
| a5409de9 | 26 | .TH UTS_NAMESPACES 7 2019-11-19 "Linux" "Linux Programmer's Manual" |
| 57829a0e | 27 | .SH NAME |
| 0549038d | 28 | uts_namespaces \- overview of Linux UTS namespaces |
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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). | |
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41 | Changes made to these identifiers are visible to all other |
| 42 | processes in the same UTS namespace, | |
| 43 | but are not visible to processes in other UTS namespaces. | |
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44 | .PP |
| 45 | .PP | |
| 46 | When a process creates a new UTS namespace using | |
| 47 | .BR clone (2) | |
| 48 | or | |
| 49 | .BR unshare (2) | |
| 50 | with the | |
| 51 | .BR CLONE_NEWUTS | |
| 52 | flag, the hostname and domain of the new UTS namespace are copied | |
| 53 | from the corresponding values in the caller's UTS namespace. | |
| 54 | .PP | |
| 55 | Use of UTS namespaces requires a kernel that is configured with the | |
| 56 | .B CONFIG_UTS_NS | |
| 57 | option. | |
| 58 | .SH SEE ALSO | |
| 59 | .BR nsenter (1), | |
| 60 | .BR unshare (1), | |
| 61 | .BR clone (2), | |
| 252bba44 | 62 | .BR getdomainname (2), |
| 27f942ad | 63 | .BR gethostname (2), |
| 57829a0e | 64 | .BR setns (2), |
| 252bba44 | 65 | .BR uname (2), |
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66 | .BR unshare (2), |
| 67 | .BR namespaces (7) |