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MACHINECTL(1) machinectl MACHINECTL(1)
NAME
machinectl - Control the systemd machine manager
SYNOPSIS
machinectl [OPTIONS...] {COMMAND} [NAME...]
DESCRIPTION
machinectl may be used to introspect and control the state of the systemd(1) virtual
machine and container registration manager systemd-machined.service(8).
OPTIONS
The following options are understood:
-p, --property=
When showing machine or image properties, limit the output to certain properties as
specified by the argument. If not specified, all set properties are shown. The
argument should be a property name, such as "Name". If specified more than once, all
properties with the specified names are shown.
-a, --all
When showing machine or image properties, show all properties regardless of whether
they are set or not.
When listing VM or container images, do not suppress images beginning in a dot
character (".").
-l, --full
Do not ellipsize process tree entries.
--no-ask-password
Do not query the user for authentication for privileged operations.
--kill-who=
When used with kill, choose which processes to kill. Must be one of leader, or all to
select whether to kill only the leader process of the machine or all processes of the
machine. If omitted, defaults to all.
-s, --signal=
When used with kill, choose which signal to send to selected processes. Must be one of
the well-known signal specifiers, such as SIGTERM, SIGINT or SIGSTOP. If omitted,
defaults to SIGTERM.
--mkdir
When used with bind creates the destination directory before applying the bind mount.
--read-only
When used with bind applies a read-only bind mount.
-n, --lines=
When used with status, controls the number of journal lines to show, counting from the
most recent ones. Takes a positive integer argument. Defaults to 10.
-o, --output=
When used with status, controls the formatting of the journal entries that are shown.
For the available choices, see journalctl(1). Defaults to "short".
--verify=
When downloading a container or VM image, specify whether the image shall be verified
before it is made available. Takes one of "no", "checksum" and "signature". If "no" no
verification is done. If "checksum" is specified the download is checked for integrity
after transfer is complete, but no signatures are verified. If "signature" is
specified, the checksum is verified and the images's signature is checked against a
local keyring of trustable vendors. It is strongly recommended to set this option to
"signature" if the server and protocol support this. Defaults to "signature".
--force
When downloading a container or VM image, and a local copy by the specified local
machine name already exists, delete it first and replace it by the newly downloaded
image.
-H, --host=
Execute the operation remotely. Specify a hostname, or a username and hostname
separated by "@", to connect to. The hostname may optionally be suffixed by a
container name, separated by ":", which connects directly to a specific container on
the specified host. This will use SSH to talk to the remote machine manager instance.
Container names may be enumerated with machinectl -H HOST.
-M, --machine=
Execute operation on a local container. Specify a container name to connect to.
--no-pager
Do not pipe output into a pager.
--no-legend
Do not print the legend, i.e. column headers and the footer with hints.
-h, --help
Print a short help text and exit.
--version
Print a short version string and exit.
COMMANDS
The following commands are understood:
Machine Commands
list
List currently running (online) virtual machines and containers. To enumerate
container images that can be started, use list-images (see below).
status NAME...
Show terse runtime status information about one or more virtual machines and
containers, followed by the most recent log data from the journal. This function is
intended to generate human-readable output. If you are looking for computer-parsable
output, use show instead. Note that the log data shown is reported by the virtual
machine or container manager, and frequently contains console output of the machine,
but not necessarily journal contents of the machine itself.
show NAME...
Show properties of one or more registered virtual machines or containers or the
manager itself. If no argument is specified, properties of the manager will be shown.
If an NAME is specified, properties of this virtual machine or container are shown. By
default, empty properties are suppressed. Use --all to show those too. To select
specific properties to show, use --property=. This command is intended to be used
whenever computer-parsable output is required. Use status if you are looking for
formatted human-readable output.
start NAME...
Start a container as a system service, using systemd-nspawn(1). This starts
systemd-nspawn@.service, instantiated for the specified machine name, similar to the
effect of systemctl start on the service name. systemd-nspawn looks for a container
image by the specified name in /var/lib/machines/ (and other search paths, see below)
and runs it. Use list-images (see below), for listing available container images to
start.
Note that systemd-machined.service(8) also interfaces with a variety of other
container and VM managers, systemd-nspawn is just one implementation of it. Most of
the commands available in machinectl may be used on containers or VMs controlled by
other managers, not just systemd-nspawn. Starting VMs and container images on those
managers requires manager-specific tools.
To interactively start a container on the command line with full access to the
container's console, please invoke systemd-nspawn directly. To stop a running
container use machinectl poweroff, see below.
login NAME
Open an interactive terminal login session to a container. This will create a TTY
connection to a specific container and asks for the execution of a getty on it. Note
that this is only supported for containers running systemd(1) as init system.
This command will open a full login prompt on the container, which then asks for
username and password. Use systemd-run(1) with the --machine= switch to invoke a
single command, either interactively or in the background within a local container.
enable NAME..., disable NAME...
Enable or disable a container as a system service to start at system boot, using
systemd-nspawn(1). This enables or disables systemd-nspawn@.service, instantiated for
the specified machine name, similar to the effect of systemctl enable or systemctl
disable on the service name.
poweroff NAME...
Power off one or more containers. This will trigger a reboot by sending SIGRTMIN+4 to
the container's init process, which causes systemd-compatible init systems to shut
down cleanly. This operation does not work on containers that do not run a
systemd(1)-compatible init system, such as sysvinit. Use terminate (see below) to
immediately terminate a container or VM, without cleanly shutting it down.
reboot NAME...
Reboot one or more containers. This will trigger a reboot by sending SIGINT to the
container's init process, which is roughly equivalent to pressing Ctrl+Alt+Del on a
non-containerized system, and is compatible with containers running any system
manager.
terminate NAME...
Immediately terminates a virtual machine or container, without cleanly shutting it
down. This kills all processes of the virtual machine or container and deallocates all
resources attached to that instance. Use poweroff to issue a clean shutdown request.
kill NAME...
Send a signal to one or more processes of the virtual machine or container. This means
processes as seen by the host, not the processes inside the virtual machine or
container. Use --kill-who= to select which process to kill. Use --signal= to select
the signal to send.
bind NAME PATH [PATH]
Bind mounts a directory from the host into the specified container. The first
directory argument is the source directory on the host, the second directory argument
the source directory on the host. When the latter is omitted the destination path in
the container is the same as the source path on the host. When combined with the
--read-only switch a ready-only bind mount is created. When combined with the --mkdir
switch the destination path is first created before the mount is applied. Note that
this option is currently only supported for systemd-nspawn(1) containers.
copy-to NAME PATH [PATH]
Copies files or directories from the host system into a running container. Takes a
container name, followed by the source path on the host and the destination path in
the container. If the destination path is omitted the same as the source path is used.
copy-from NAME PATH [PATH]
Copies files or directories from a container into the host system. Takes a container
name, followed by the source path in the container the destination path on the host.
If the destination path is omitted the same as the source path is used.
Image Commands
list-images
Show a list of locally installed container and VM images. This enumerates all raw disk
images and container directories and subvolumes in /var/lib/machines/ (and other
search paths, see below). Use start (see above) to run a container off one of the
listed images. Note that by default containers whose name begins with a dot (".") are
not shown. To show these too, specify --all. Note that a special image ".host" always
implicitly exists and refers to the image the host itself is booted from.
image-status NAME...
Show terse status information about one or more container or VM images. This function
is intended to generate human-readable output. Use show-image (see below) to generate
computer-parsable output instead.
show-image NAME...
Show properties of one or more registered virtual machine or container images, or the
manager itself. If no argument is specified, properties of the manager will be shown.
If an NAME is specified, properties of this virtual machine or container image are
shown. By default, empty properties are suppressed. Use --all to show those too. To
select specific properties to show, use --property=. This command is intended to be
used whenever computer-parsable output is required. Use image-status if you are
looking for formatted human-readable output.
clone NAME NAME
Clones a container or disk image. The arguments specify the name of the image to clone
and the name of the newly cloned image. Note that plain directory container images are
cloned into subvolume images with this command. Note that cloning a container or VM
image is optimized for btrfs file systems, and might not be efficient on others, due
to file system limitations.
rename NAME NAME
Renames a container or disk image. The arguments specify the name of the image to
rename and the new name of the image.
read-only NAME [BOOL]
Marks or (unmarks) a container or disk image read-only. Takes a VM or container image
name, followed by a boolean as arguments. If the boolean is omitted, positive is
implied, i.e. the image is marked read-only.
remove NAME...
Removes one or more container or disk images. The special image ".host", which refers
to the host's own directory tree may not be removed.
Image Transfer Commands
pull-tar URL [NAME]
Downloads a .tar container image from the specified URL, and makes it available under
the specified local machine name. The URL must be of type "http://" or "https://", and
must refer to a .tar, .tar.gz, .tar.xz or .tar.bz2 archive file. If the local machine
name is omitted the name it is automatically derived from the last component of the
URL, with its suffix removed.
The image is verified before it is made available, unless --verify=no is specified.
Verification is done via SHA256SUMS and SHA256SUMS.gpg files, that need to be made
available on the same web server, under the same URL as the .tar file, but with the
last component (the filename) of the URL replaced. With --verify=checksum only the
SHA256 checksum for the file is verified, based on the SHA256SUMS file. With
--verify=signature the SHA256SUMS file is first verified with detached GPG signature
file SHA256SUMS.gpg. The public key for this verification step needs to be available
in /usr/lib/systemd/import-pubring.gpg or /etc/systemd/import-pubring.gpg.
The container image will be downloaded and stored in a read-only subvolume in
/var/lib/machines/, that is named after the specified URL and its HTTP etag. A
writable snapshot is then taken from this subvolume, and named after the specified
local name. This behaviour ensures that creating multiple container instances of the
same URL is efficient, as multiple downloads are not necessary. In order to create
only the read-only image, and avoid creating its writable snapshot, specify "-" as
local machine name.
Note that the read-only subvolume is prefixed with .tar-, and is thus now shown by
list-images, unless --all is passed.
Note that pressing C-c during execution of this command will not abort the download.
Use cancel-transfer, described below.
pull-raw URL [NAME]
Downloads a .raw container or VM disk image from the specified URL, and makes it
available under the specified local machine name. The URL must be of type "http://" or
"https://". The container image must either be a .qcow2 or raw disk image, optionally
compressed as .gz, .xz, or .bz2. If the local machine name is omitted the name it is
automatically derived from the last component of the URL, with its suffix removed.
Image verification is identical for raw and tar images (see above).
If the the downloaded image is in .qcow2 format it es converted into a raw image file
before it is made available.
Downloaded images of this type will be placed as read-only .raw file in
/var/lib/machines/. A local, writable (reflinked) copy is then made under the
specified local machine name. To omit creation of the local, writable copy pass "-" as
local machine name.
Similar to the behaviour of pull-tar, the read-only image is prefixed with .raw-, and
thus now shown by list-images, unless --all is passed.
Note that pressing C-c during execution of this command will not abort the download.
Use cancel-transfer, described below.
list-transfers
Shows a list of container or VM image downloads that are currently in progress.
cancel-transfers ID...
Aborts download of the container or VM image with the specified ID. To list ongoing
transfers and their IDs, use list-transfers.
FILES AND DIRECTORIES
Machine images are preferably stored in /var/lib/machines/, but are also searched for in
/usr/local/lib/machines/ and /usr/lib/machines/. For compatibility reasons the directory
/var/lib/container/ is searched, too. Note that images stored below /usr are always
considered read-only. It is possible to symlink machines images from other directories
into /var/lib/machines/ to make them available for control with machinectl.
Disk images are understood by systemd-nspawn(1) and machinectl in three formats:
o A simple directory tree, containing the files and directories of the container to
boot.
o A subvolume (on btrfs file systems), which are similar to the simple directories,
described above. However, they have additional benefits, such as efficient cloning and
quota reporting.
o "Raw" disk images, i.e. binary images of disks with a GPT or MBR partition table.
Images of this type are regular files with the suffix ".raw".
See systemd-nspawn(1) for more information on image formats, in particular it's
--directory= and --image= options.
EXAMPLES
Example 1. Download an Ubuntu image and open a shell in it
# machinectl pull-tar https://cloud-images.ubuntu.com/trusty/current/trusty-server-cloudimg-amd64-root.tar.gz
# systemd-nspawn -M trusty-server-cloudimg-amd64-root
This downloads and verifies the specified .tar image, and then uses systemd-nspawn(1) to
open a shell in it.
Example 2. Download a Fedora image, set a root password in it, start it as service
# machinectl pull-raw --verify=no http://ftp.halifax.rwth-aachen.de/fedora/linux/releases/21/Cloud/Images/x86_64/Fedora-Cloud-Base-20141203-21.x86_64.raw.xz
# systemd-nspawn -M Fedora-Cloud-Base-20141203-21
# passwd
# exit
# machinectl start Fedora-Cloud-Base-20141203-21
# machinectl login Fedora-Cloud-Base-20141203-21
This downloads the specified .raw image with verification disabled. Then a shell is opened
in it and a root password is set. Afterwards the shell is left, and the machine started as
system service. With the last command a login prompt into the container is requested.
EXIT STATUS
On success, 0 is returned, a non-zero failure code otherwise.
ENVIRONMENT
$SYSTEMD_PAGER
Pager to use when --no-pager is not given; overrides $PAGER. Setting this to an empty
string or the value "cat" is equivalent to passing --no-pager.
$SYSTEMD_LESS
Override the default options passed to less ("FRSXMK").
SEE ALSO
systemd-machined.service(8), systemd-nspawn(1), systemd.special(7)
systemd 219 MACHINECTL(1)
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Under GNU General Public License
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