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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | SEE ALSO | COLOPHON |
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lxc-unshare(1) lxc-unshare(1)
lxc-unshare - Run a task in a new set of namespaces.
lxc-unshare {-s, --namespaces namespaces} [-u, --user user] [-H,
--hostname hostname] [-i, --ifname ifname] [-d,
--daemon] [-M, --remount] {command}
lxc-unshare can be used to run a task in a cloned set of name‐
spaces. This command is mainly provided for testing purposes. De‐
spite its name, it always uses clone rather than unshare to create
the new task with fresh namespaces. Apart from testing kernel re‐
gressions this should make no difference.
-s, --namespaces namespaces
Specify the namespaces to attach to, as a pipe-separated
list, e.g. NETWORK|IPC. Allowed values are MOUNT, PID, UT‐
SNAME, IPC, USER and NETWORK. This allows one to change the
context of the process to e.g. the network namespace of the
container while retaining the other namespaces as those of
the host. (The pipe symbol needs to be escaped, e.g.
MOUNT\|PID or quoted, e.g. "MOUNT|PID".)
-u, --user user
Specify a userid which the new task should become.
-H, --hostname hostname
Set the hostname in the new container. Only allowed if the
UTSNAME namespace is set.
-i, --ifname interfacename
Move the named interface into the container. Only allowed
if the NETWORK namespace is set. You may specify this argu‐
ment multiple times to move multiple interfaces into con‐
tainer.
-d, --daemon
Daemonize (do not wait for the container to exit before ex‐
iting)
-M, --remount
Mount default filesystems (/proc /dev/shm and /dev/mqueue)
in the container. Only allowed if MOUNT namespace is set.
To spawn a new shell with its own UTS (hostname) namespace,
lxc-unshare -s UTSNAME /bin/bash
If the hostname is changed in that shell, the change will not be
reflected on the host.
To spawn a shell in a new network, pid, and mount namespace,
lxc-unshare -s "NETWORK|PID|MOUNT" /bin/bash
The resulting shell will have pid 1 and will see no network inter‐
faces. After re-mounting /proc in that shell,
mount -t proc proc /proc
ps output will show there are no other processes in the namespace.
To spawn a shell in a new network, pid, mount, and hostname name‐
space.
lxc-unshare -s "NETWORK|PID|MOUNT|UTSNAME" -M -H myhostname -i veth1 /bin/bash
The resulting shell will have pid 1 and will see two network in‐
terfaces (lo and veth1). The hostname will be "myhostname" and
/proc will have been remounted. ps output will show there are no
other processes in the namespace.
lxc(7), lxc-create(1), lxc-copy(1), lxc-destroy(1), lxc-start(1),
lxc-stop(1), lxc-execute(1), lxc-console(1), lxc-monitor(1),
lxc-wait(1), lxc-cgroup(1), lxc-ls(1), lxc-info(1), lxc-freeze(1),
lxc-unfreeze(1), lxc-attach(1), lxc.conf(5)
This page is part of the lxc (Linux containers) project. Informa‐
tion about the project can be found at
⟨http://linuxcontainers.org/⟩. If you have a bug report for this
manual page, send it to lxc-devel@lists.linuxcontainers.org. This
page was obtained from the project's upstream Git repository
⟨https://github.com/lxc/lxc.git⟩ on 2025-02-02. (At that time,
the date of the most recent commit that was found in the
repository was 2025-01-24.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
2024-04-03 lxc-unshare(1)
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HTML rendering created 2025-02-02 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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