Manual pages: unshare.1: clarify that --pid=<file> requires --fork
Attempting to create a persistent PID namespace with --pid=<file> will result in an error if --fork is not also specified. Let's warn people about that, so they don't get puzzled. Signed-off-by: Michael Kerrisk (man-pages) <mtk.manpages@gmail.com> Signed-off-by: Karel Zak <kzak@redhat.com>
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@ -114,8 +114,13 @@ Unshare the network namespace. If \fIfile\fP is specified, then a persistent
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namespace is created by a bind mount.
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namespace is created by a bind mount.
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.TP
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.TP
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.BR \-p , " \-\-pid" [ =\fIfile ]
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.BR \-p , " \-\-pid" [ =\fIfile ]
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Unshare the PID namespace. If \fIfile\fP is specified then persistent
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Unshare the PID namespace. If \fIfile\fP is specified, then a persistent
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namespace is created by a bind mount. See also the \fB\-\-fork\fP and
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namespace is created by a bind mount.
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(Creation of a persistent PID namespace will fail if the
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.B \-\-fork
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option is not also specified.)
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.IP
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See also the \fB\-\-fork\fP and
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\fB\-\-mount-proc\fP options.
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\fB\-\-mount-proc\fP options.
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.TP
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.TP
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.BR \-u , " \-\-uts" [ =\fIfile ]
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.BR \-u , " \-\-uts" [ =\fIfile ]
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