124 lines
3.8 KiB
Text
124 lines
3.8 KiB
Text
//po4a: entry man manual
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////
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Man page for the lsns command.
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Copyright 2015 Karel Zak <kzak@redhat.com>
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May be distributed under the GNU General Public License
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////
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= lsns(8)
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:doctype: manpage
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:man manual: System Administration
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:man source: util-linux {release-version}
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:page-layout: base
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:command: lsns
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== NAME
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lsns - list namespaces
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== SYNOPSIS
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*lsns* [options] [_namespace_]
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== DESCRIPTION
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*lsns* lists information about all the currently accessible namespaces or about the given _namespace_. The _namespace_ identifier is an inode number.
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The default output is subject to change. So whenever possible, you should avoid using default outputs in your scripts. Always explicitly define expected output mode (*--tree* or *--list*) and columns by using the *--output* option together with a columns list in environments where a stable output is required.
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The *NSFS* column, printed when *net* is specified for the *--type* option, is special; it uses multi-line cells. Use the option *--nowrap* to switch to ","-separated single-line representation.
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Note that *lsns* reads information directly from the _/proc_ filesystem and for non-root users it may return incomplete information. The current _/proc_ filesystem may be unshared and affected by a PID namespace (see *unshare --mount-proc* for more details). *lsns* is not able to see persistent namespaces without processes where the namespace instance is held by a bind mount to /proc/_pid_/ns/_type_.
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== OPTIONS
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*-H*, *--list-columns*::
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List the available columns, use with *--json* or *--raw* to get output in machine-readable format.
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*-J*, *--json*::
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Use JSON output format.
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*-l*, *--list*::
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Use list output format.
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*-n*, *--noheadings*::
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Do not print a header line.
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*-o*, *--output* _list_::
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Specify which output columns to print. Use *--help* to get a list of all supported columns.
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+
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The default list of columns may be extended if _list_ is specified in the format **+**__list__ (e.g., *lsns -o +PATH*).
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*--output-all*::
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Output all available columns.
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*-P*, *--persistent*::
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Display only the namespaces without processes (aka persistent namespaces), created by bind mounting
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/proc/pid/ns/type files to a filesystem path.
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*-p*, *--task* _PID_::
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Display only the namespaces held by the process with this _PID_.
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*-Q*, *--filter* _expr_::
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Print only the namespaces that meet the conditions specified by the expr.
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+
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This feature is EXPERIMENTAL. See also *scols-filter*(5). For example
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exclude root as username, but print every namespaces more than one process
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belongs to:
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____
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lsns --filter 'USER != "root" and NPROCS > 1'
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____
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*-r*, *--raw*::
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Use the raw output format.
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*-t*, *--type* _type_::
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Display the specified _type_ of namespaces only. The supported types are *mnt*, *net*, *ipc*, *user*, *pid*, *uts*, *cgroup* and *time*. This option may be given more than once.
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*-u*, *--notruncate*::
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Do not truncate text in columns.
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*-W*, *--nowrap*::
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Do not use multi-line text in columns.
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*-T*, *--tree*[**=**__rel__]::
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Use tree-like output format. If *process* is given as _rel_, print process tree(s) in each name space. This is default when *--tree* is not specified. If *parent* is given, print tree(s) constructed by the parent/child relationship. If *owner* is given, print tree(s) constructed by the owner/owned relationship. *owner* is used as default when _rel_ is omitted.
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include::man-common/help-version.adoc[]
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== EXIT STATUS
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The *lsns* utility exits with one of the following values:
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*0*::
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Success.
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*1*::
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General error.
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*2*::
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An ioctl was unknown to the kernel.
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== ENVIRONMENT
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*LSNS_DEBUG*=all::
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enables *lsns* debug output.
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== AUTHORS
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mailto:kzak@redhat.com[Karel Zak]
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== SEE ALSO
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*nsenter*(1),
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*unshare*(1),
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*clone*(2),
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*namespaces*(7),
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*ioctl_ns*(2),
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*ip-netns*(8)
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*scols-filter*(5)
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include::man-common/bugreports.adoc[]
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include::man-common/footer.adoc[]
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ifdef::translation[]
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include::man-common/translation.adoc[]
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endif::[]
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