man/systemd-machine-id-commit.1

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   2 .TH "SYSTEMD\-MACHINE\-ID\-COMMIT" "1" "" "systemd 218" "systemd-machine-id-commit"
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  20 .\" * MAIN CONTENT STARTS HERE *
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  22 .SH "NAME"
  23 systemd-machine-id-commit \- Commit transient machine ID to /etc/machine\-id
  24 .SH "SYNOPSIS"
  25 .HP \w'\fBsystemd\-machine\-id\-commit\fR\ 'u
  26 \fBsystemd\-machine\-id\-commit\fR
  27 .SH "DESCRIPTION"
  28 .PP
  29 \fBsystemd\-machine\-id\-commit\fR
  30 may be used to write on disk any transient machine ID mounted as a temporary file system in
  31 /etc/machine\-id
  32 at boot time\&. See
  33 \fBmachine-id\fR(5)
  34 for more information about this file\&.
  35 .PP
  36 This tool will execute no operation if
  37 /etc/machine\-id
  38 doesn\*(Aqt contain any valid machine ID, isn\*(Aqt mounted as an independent temporary file system, of
  39 /etc
  40 is read\-only\&. If those conditions are met, it will then write current machine ID to disk and unmount the transient
  41 /etc/machine\-id
  42 file in a race\-free manner to ensure that this file is always valid for other processes\&.
  43 .PP
  44 Note that the traditional way to initialize the machine ID in
  45 /etc/machine\-id
  46 is to use
  47 \fBsystemd\-machine\-id\-setup\fR
  48 by system installer tools\&. You can also use
  49 \fBsystemd-firstboot\fR(1)
  50 to initialize the machine ID on mounted (but not booted) system images\&.
  51 .SH "OPTIONS"
  52 .PP
  53 The following options are understood:
  54 .PP
  55 \fB\-\-root=\fR\fB\fIroot\fR\fR
  56 .RS 4
  57 Takes a directory path as an argument\&. All paths will be prefixed with the given alternate
  58 \fIroot\fR
  59 path, including config search paths\&.
  60 .RE
  61 .PP
  62 \fB\-h\fR, \fB\-\-help\fR
  63 .RS 4
  64 Print a short help text and exit\&.
  65 .RE
  66 .PP
  67 \fB\-\-version\fR
  68 .RS 4
  69 Print a short version string and exit\&.
  70 .RE
  71 .SH "EXIT STATUS"
  72 .PP
  73 On success, 0 is returned, a non\-zero failure code otherwise\&.
  74 .SH "SEE ALSO"
  75 .PP
  76 \fBsystemd\fR(1),
  77 \fBsystemd-machine-id-commit.service\fR(8),
  78 \fBsystemd-machine-id-setup\fR(1),
  79 \fBmachine-id\fR(5),
  80 \fBsystemd-firstboot\fR(1)