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docker-create - Create a new container


docker create [-a|--attach[=[]]] [--add-host[=[]]] [--blkio-weight[=[BLKIO-WEIGHT]]]
[--blkio-weight-device[=[]]] [--cpu-shares[=0]] [--cap-add[=[]]] [--cap-drop[=[]]]
[--cgroup-parent[=CGROUP-PATH]] [--cidfile[=CIDFILE]] [--cpu-period[=0]] [--cpu-quota[=0]]
[--cpuset-cpus[=CPUSET-CPUS]] [--cpuset-mems[=CPUSET-MEMS]] [--device[=[]]]
[--device-read-bps[=[]]] [--device-read-iops[=[]]] [--device-write-bps[=[]]]
[--device-write-iops[=[]]] [--dns[=[]]] [--dns-search[=[]]] [--dns-opt[=[]]]
[-e|--env[=[]]] [--entrypoint[=ENTRYPOINT]] [--env-file[=[]]] [--expose[=[]]]
[--group-add[=[]]] [-h|--hostname[=HOSTNAME]] [--help] [-i|--interactive]
[--ip[=IPv4-ADDRESS]] [--ip6[=IPv6-ADDRESS]] [--ipc[=IPC]] [--isolation[=default]]
[--kernel-memory[=KERNEL-MEMORY]] [-l|--label[=[]]] [--label-file[=[]]] [--link[=[]]]
[--log-driver[=[]]] [--log-opt[=[]]] [-m|--memory[=MEMORY]] [--mac-address[=MAC-ADDRESS]]
[--memory-reservation[=MEMORY-RESERVATION]] [--memory-swap[=LIMIT]]
[--memory-swappiness[=MEMORY-SWAPPINESS]] [--name[=NAME]] [--net[="bridge"]]
[--net-alias[=[]]] [--oom-kill-disable] [--oom-score-adj[=0]] [-P|--publish-all]
[-p|--publish[=[]]] [--pid[=[]]] [--privileged] [--read-only] [--restart[=RESTART]]
[--security-opt[=[]]] [--stop-signal[=SIGNAL]] [--shm-size[=[]]] [-t|--tty]
[--tmpfs[=[CONTAINER-DIR[:<OPTIONS>]]] [-u|--user[=USER]] [--ulimit[=[]]] [--uts[=[]]]
[-v|--volume[=[[HOST-DIR:]CONTAINER-DIR[:OPTIONS]]]] [--volume-driver[=DRIVER]]
[--volumes-from[=[]]] [-w|--workdir[=WORKDIR]] IMAGE [COMMAND] [ARG...]


Creates a writeable container layer over the specified image and prepares it for running
the specified command. The container ID is then printed to STDOUT. This is similar to
docker run -d except the container is never started. You can then use the docker start
<container_id> command to start the container at any point.

The initial status of the container created with docker create is 'created'.


-a, --attach=[]

Add a custom host-to-IP mapping (host:ip)

Block IO weight (relative weight) accepts a weight value between 10 and 1000.

Block IO weight (relative device weight, format: DEVICE_NAME:WEIGHT).

CPU shares (relative weight)

Add Linux capabilities

Drop Linux capabilities

Path to cgroups under which the cgroup for the container will be created. If the path
is not absolute, the path is considered to be relative to the cgroups path of the init
process. Cgroups will be created if they do not already exist.

Write the container ID to the file

Limit the CPU CFS (Completely Fair Scheduler) period

CPUs in which to allow execution (0-3, 0,1)

Memory nodes (MEMs) in which to allow execution (0-3, 0,1). Only effective on NUMA

If you have four memory nodes on your system (0-3), use --cpuset-mems=0,1 then processes
in your Docker container will only use memory from the first two memory nodes.

Limit the CPU CFS (Completely Fair Scheduler) quota

Add a host device to the container (e.g. --device=/dev/sdc:/dev/xvdc:rwm)

Limit read rate (bytes per second) from a device (e.g. --device-read-bps=/dev/sda:1mb)

Limit read rate (IO per second) from a device (e.g. --device-read-iops=/dev/sda:1000)

Limit write rate (bytes per second) to a device (e.g. --device-write-bps=/dev/sda:1mb)

Limit write rate (IO per second) to a device (e.g. --device-write-iops=/dev/sda:1000)

Set custom DNS servers

Set custom DNS options

Set custom DNS search domains (Use --dns-search=. if you don't wish to set the search

-e, --env=[]
Set environment variables

Overwrite the default ENTRYPOINT of the image

Read in a line-delimited file of environment variables

Expose a port or a range of ports (e.g. --expose=3300-3310) from the container without
publishing it to your host

Add additional groups to run as

-h, --hostname=""
Container host name

Print usage statement

-i, --interactive=true|false
Keep STDIN open even if not attached. The default is false.

Sets the container's interface IPv4 address (e.g.

It can only be used in conjunction with --net for user-defined networks

Sets the container's interface IPv6 address (e.g. 2001:db8::1b99)

It can only be used in conjunction with --net for user-defined networks

Default is to create a private IPC namespace (POSIX SysV IPC) for the container
'container:<name|id>': reuses another container shared
memory, semaphores and message queues
'host': use the host shared memory,semaphores and message
queues inside the container. Note: the host mode gives the container full access to local
shared memory and is therefore considered insecure.

Isolation specifies the type of isolation technology used by containers.

Kernel memory limit (format: <number>[<unit>], where unit = b, k, m or g)

Constrains the kernel memory available to a container. If a limit of 0 is specified (not
using --kernel-memory), the container's kernel memory is not limited. If you specify a
limit, it may be rounded up to a multiple of the operating system's page size and the
value can be very large, millions of trillions.

-l, --label=[]
Adds metadata to a container (e.g., --label=com.example.key=value)

Read labels from a file. Delimit each label with an EOL.

Add link to another container in the form of <name or id>:alias or just
<name or id> in which case the alias will match the name.

Logging driver for container. Default is defined by daemon --log-driver flag.
Warning: the docker logs command works only for the json-file and
journald logging drivers.

Logging driver specific options.

-m, --memory=""
Memory limit (format: <number>[<unit>], where unit = b, k, m or g)

Allows you to constrain the memory available to a container. If the host supports swap
memory, then the -m memory setting can be larger than physical RAM. If a limit of 0 is
specified (not using -m), the container's memory is not limited. The actual limit may be
rounded up to a multiple of the operating system's page size (the value would be very
large, that's millions of trillions).

Container MAC address (e.g. 92:d0:c6:0a:29:33)

Memory soft limit (format: <number>[<unit>], where unit = b, k, m or g)

After setting memory reservation, when the system detects memory contention or low memory,
containers are forced to restrict their consumption to their reservation. So you should
always set the value below --memory, otherwise the hard limit will take precedence. By
default, memory reservation will be the same as memory limit.

A limit value equal to memory plus swap. Must be used with the -m (--memory) flag. The
swap LIMIT should always be larger than -m (--memory) value.

The format of LIMIT is <number>[<unit>]. Unit can be b (bytes), k (kilobytes), m
(megabytes), or g (gigabytes). If you don't specify a unit, b is used. Set LIMIT to -1 to
enable unlimited swap.

Tune a container's memory swappiness behavior. Accepts an integer between 0 and 100.

Assign a name to the container

Set the Network mode for the container
'bridge': create a network stack on the default Docker
'none': no networking
'container:<name|id>': reuse another container's network
'host': use the Docker host network stack. Note: the host
mode gives the container full access to local system services such as D-bus and is
therefore considered insecure.
'<network-name>|<network-id>': connect to a user-defined

Add network-scoped alias for the container

Whether to disable OOM Killer for the container or not.

Tune the host's OOM preferences for containers (accepts -1000 to 1000)

-P, --publish-all=true|false
Publish all exposed ports to random ports on the host interfaces. The default is false.

-p, --publish=[]
Publish a container's port, or a range of ports, to the host
format: ip:hostPort:containerPort | ip::containerPort |
hostPort:containerPort | containerPort
Both hostPort and containerPort can be specified as a range
of ports.
When specifying ranges for both, the number of container
ports in the range must match the number of host ports in the range. (e.g., -p
(use 'docker port' to see the actual mapping)

Set the PID mode for the container
host: use the host's PID namespace inside the container.
Note: the host mode gives the container full access to local PID and is therefore
considered insecure.

Give extended privileges to this container. The default is false.

Mount the container's root filesystem as read only.

Restart policy to apply when a container exits (no, on-failure[:max-retry], always,

Size of /dev/shm. The format is <number><unit>. number must be greater than 0.
Unit is optional and can be b (bytes), k (kilobytes), m (megabytes), or g (gigabytes).
If you omit the unit, the system uses bytes.
If you omit the size entirely, the system uses 64m.

Security Options

Signal to stop a container. Default is SIGTERM.

-t, --tty=true|false
Allocate a pseudo-TTY. The default is false.

--tmpfs=[] Create a tmpfs mount

Mount a temporary filesystem (tmpfs) mount into a container, for example:

$ docker run -d --tmpfs /tmp:rw,size=787448k,mode=1777 my_image

This command mounts a tmpfs at /tmp within the container. The supported mount options are
the same as the Linux default mount flags. If you do not specify any options, the systems
uses the following options: rw,noexec,nosuid,nodev,size=65536k.

-u, --user=""
Username or UID

Ulimit options

Set the UTS mode for the container
host: use the host's UTS namespace inside the container.
Note: the host mode gives the container access to changing the host's hostname and is
therefore considered insecure.

Create a bind mount. If you specify, -v /HOST-DIR:/CONTAINER-DIR, Docker
bind mounts /HOST-DIR in the host to /CONTAINER-DIR in the Docker
container. If 'HOST-DIR' is omitted, Docker automatically creates the new
volume on the host. The OPTIONS are a comma delimited list and can be:

· [rw|ro]

· [z|Z]

· [[r]shared|[r]slave|[r]private]

The CONTAINER-DIR must be an absolute path such as /src/docs. The HOST-DIR can be an
absolute path or a name value. A name value must start with an alphanumeric character,
followed by a-z0-9, _ (underscore), . (period) or - (hyphen). An absolute path starts with
a / (forward slash).

If you supply a HOST-DIR that is an absolute path, Docker bind-mounts to the path you
specify. If you supply a name, Docker creates a named volume by that name. For example,
you can specify either /foo or foo for a HOST-DIR value. If you supply the /foo value,
Docker creates a bind-mount. If you supply the foo specification, Docker creates a named

You can specify multiple -v options to mount one or more mounts to a container. To use
these same mounts in other containers, specify the --volumes-from option also.

You can add :ro or :rw suffix to a volume to mount it read-only or read-write mode,
respectively. By default, the volumes are mounted read-write. See examples.

Labeling systems like SELinux require that proper labels are placed on volume content
mounted into a container. Without a label, the security system might prevent the processes
running inside the container from using the content. By default, Docker does not change
the labels set by the OS.

To change a label in the container context, you can add either of two suffixes :z or :Z to
the volume mount. These suffixes tell Docker to relabel file objects on the shared
volumes. The z option tells Docker that two containers share the volume content. As a
result, Docker labels the content with a shared content label. Shared volume labels allow
all containers to read/write content. The Z option tells Docker to label the content with
a private unshared label. Only the current container can use a private volume.

By default bind mounted volumes are private. That means any mounts done inside container
will not be visible on host and vice-a-versa. One can change this behavior by specifying a
volume mount propagation property. Making a volume shared mounts done under that volume
inside container will be visible on host and vice-a-versa. Making a volume slave enables
only one way mount propagation and that is mounts done on host under that volume will be
visible inside container but not the other way around.

To control mount propagation property of volume one can use :[r]shared, :[r]slave or
:[r]private propagation flag. Propagation property can be specified only for bind mounted
volumes and not for internal volumes or named volumes. For mount propagation to work
source mount point (mount point where source dir is mounted on) has to have right
propagation properties. For shared volumes, source mount point has to be shared. And for
slave volumes, source mount has to be either shared or slave.

Use df <source-dir> to figure out the source mount and then use findmnt -o
TARGET,PROPAGATION <source-mount-dir> to figure out propagation properties of source
mount. If findmnt utility is not available, then one can look at mount entry for source
mount point in /proc/self/mountinfo. Look at optional fields and see if any propagaion
properties are specified. shared:X means mount is shared, master:X means mount is slave
and if nothing is there that means mount is private.

To change propagation properties of a mount point use mount command. For example, if one
wants to bind mount source directory /foo one can do mount --bind /foo /foo and mount
--make-private --make-shared /foo. This will convert /foo into a shared mount point.
Alternatively one can directly change propagation properties of source mount. Say / is
source mount for /foo, then use mount --make-shared / to convert / into a shared mount.

Note: When using systemd to manage the Docker daemon's start and stop, in the
systemd unit file there is an option to control mount propagation for the Docker
daemon itself, called MountFlags. The value of this setting may cause Docker to not
see mount propagation changes made on the mount point. For example, if this value
is slave, you may not be able to use the shared or rshared propagation on a volume.

Container's volume driver. This driver creates volumes specified either from
a Dockerfile's VOLUME instruction or from the docker run -v flag.
See docker-volume-create(1) for full details.

Mount volumes from the specified container(s)

-w, --workdir=""
Working directory inside the container


Specify isolation technology for container (--isolation)

This option is useful in situations where you are running Docker containers on Windows.
The --isolation=<value> option sets a container's isolation technology. On Linux, the only
supported is the default option which uses Linux namespaces. On Microsoft Windows, you can
specify these values:

· default: Use the value specified by the Docker daemon's --exec-opt . If the daemon does
not specify an isolation technology, Microsoft Windows uses process as its default

· process: Namespace isolation only.

· hyperv: Hyper-V hypervisor partition-based isolation.

Specifying the --isolation flag without a value is the same as setting


August 2014, updated by Sven Dowideit ⟨[email protected]⟩ September 2014, updated
by Sven Dowideit ⟨[email protected]⟩ November 2014, updated by Sven Dowideit
[email protected]

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