lxc-copy man page

lxc-copy — copy an existing container.

Synopsis

lxc-copy {-n, --name name} [-P, --lxcpath path] {-N, --newname newname} [-p, --newpath newpath] [-B, --backingstorage backingstorage] [-s, --snapshot] [-K, --keepdata] [-M, --keepmac] [-L, --fssize size [unit]] [-- hook arguments] lxc-copy {-n, --name name} [-P, --lxcpath path] [-N, --newname newname] [-p, --newpath newpath] {-e, --ephemeral} [-B, --backingstorage backingstorage] [-s, --snapshot] [-K, --keepdata] [-M, --keepmac] [-L, --fssize size [unit]] [-- hook arguments] lxc-copy {-n, --name name} [-P, --lxcpath path] {-N, --newname newname} [-p, --newpath newpath] {-R, --rename}

Description

lxc-copy creates and optionally starts (ephemeral or non-ephemeral) copies of existing containers. It replaces lxc-clone and lxc-start-ephemeral.

lxc-copy creates copies of existing containers. Copies can be complete clones of the original container. In this case the whole root filesystem of the container is simply copied to the new container. Or they can be snapshots, i.e. small copy-on-write copies of the original container. In this case the specified backing storage for the copy must support snapshots. This currently includes aufs, btrfs, lvm (lvm devices do not support snapshots of snapshots.), overlay, and zfs.

The copy's backing storage will be of the same type as the original container. aufs or overlayfs snapshots of directory backed containers are exempted from this rule.

When the -e flag is specified an ephemeral snapshot of the original container is created and started. Ephemeral containers will have lxc.ephemeral = 1 set in their config file and will be destroyed on shutdown. When -e is used in combination with -D a non-ephemeral snapshot of the original container is created and started.

When -e is specified and no newname is given via -N a random name for the snapshot will be chosen.

Containers created and started with -e can have custom mounts. These are specified with the -m flag. Currently three types of mounts are supported: aufs, bind, and overlay. Mount types are specified as suboptions to the -m flag and can be specified multiple times separated by commas. aufs and overlay mounts are currently specified in the format -m overlay=/src:/dest. When no destination dest is specified dest will be identical to src. Read-only bind mounts are specified -m bind=/src:/dest:ro and read-write bind mounts -m bind=/src:/dest:rw. Read-write bind mounts are the default and rw can be missing when a read-write mount is wanted. When dest is missing dest will be identical to src. An example for multiple mounts would be -m bind=/src1:/dest1:ro,bind=/src2:ro,overlay=/src3:/dest3.

The mounts, their options, and formats supported via the -m flag are subject to change.

Options

-N,--newname newname
The name for the copy.
-p,--newpath newpath
The path for the copy.
-R,--rename
Rename the original container.
-s,--snapshot
Create a snapshot of the original container. The backing storage for the copy must support snapshots. This currently includes aufs, btrfs, lvm, overlay, and zfs.
-F,--foreground
Run the snapshot in the foreground. The snapshots console will be attached to the current tty. (This option can only be specified in conjunction with -e.)
-d, --daemon
Run the snapshot as a daemon (This is the default mode for ephemeral containers.). As the container has no more tty, if an error occurs nothing will be displayed, the log file can be used to check the error. (This option can only be specified in conjunction with -e.)
-m, --mount mounttype
Specify a mount for a snapshot The opts argument for the mount type can by of type {aufs, bind, overlay}. For example -m bind=/src:/dest:ro,overlay=/src:/dest (This option can currently only be specified in conjunction with -e.).
-B, --backingstorage backingstorage
Specify the backing storage type to be used for the copy where 'backingstorage' is of type 'aufs', 'btrfs', 'dir', 'lvm', 'loop', 'overlay', or 'zfs'.
-L, --fssize size [unit]
Specify the size for an 'lvm' filesystem.
-D, --keepdata
When this option is specified with -e a non-ephemeral container is created and started.
-K, --keepname
When this option is specified the hostname of the original container will be kept for the copy.
-M, --keepmac
When this option is specified the MAC address of the original container will be kept for the copy.

Copy Hook

If the container being copied has one or more lxc.hook.clone specified, then the specified hooks will be called for the new container. The first 3 arguments passed to the clone hook will be the container name, a section ('lxc'), and the hook type ('clone'). Extra arguments passed to lxc-copy will be passed to the hook program starting at argument 4. The LXC_ROOTFS_MOUNT environment variable gives the path under which the container's root filesystem is mounted. The configuration file pathname is stored in LXC_CONFIG_FILE, the new container name in LXC_NAME, the old container name in LXC_SRC_NAME, and the path or device on which the rootfs is located is in LXC_ROOTFS_PATH.

Common Options

These options are common to most of lxc commands.

-?, -h, --help
Print a longer usage message than normal.
--usage
Give the usage message
-q, --quiet
mute on
-P, --lxcpath=PATH
Use an alternate container path. The default is /var/lib/lxc.
-o, --logfile=FILE
Output to an alternate log FILE. The default is no log.
-l, --logpriority=LEVEL

Set log priority to LEVEL. The default log priority is ERROR. Possible values are : FATAL, CRIT, WARN, ERROR, NOTICE, INFO, DEBUG.

Note that this option is setting the priority of the events log in the alternate log file. It do not have effect on the ERROR events log on stderr.

-n, --name=NAME
Use container identifier NAME. The container identifier format is an alphanumeric string.
--rcfile=FILE

Specify the configuration file to configure the virtualization and isolation functionalities for the container.

This configuration file if present will be used even if there is already a configuration file present in the previously created container (via lxc-create).

--version
Show the version number.

See Also

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)

Author

Christian Brauner <christian.brauner@mailbox.org>

Referenced By

lxc(7), lxc-attach(1), lxc-autostart(1), lxc-cgroup(1), lxc-checkconfig(1), lxc-checkpoint(1), lxc-config(1), lxc-console(1), lxc.container.conf(5), lxc-create(1), lxc-destroy(1), lxc-device(1), lxc-execute(1), lxc-freeze(1), lxc-info(1), lxc-ls(1), lxc-monitor(1), lxc-snapshot(1), lxc-start(1), lxc-stop(1), lxc.system.conf(5), lxc-top(1), lxc-unfreeze(1), lxc-unshare(1), lxc-usernsexec(1), lxc-wait(1).

2016-10-05