15 KiB
| title | description | keywords |
|---|---|---|
| create | The create command description and usage | docker, create, container |
create
Creates a new container.
Usage: docker create [OPTIONS] IMAGE [COMMAND] [ARG...]
Create a new container
Options:
--add-host value Add a custom host-to-IP mapping (host:ip) (default [])
-a, --attach value Attach to STDIN, STDOUT or STDERR (default [])
--blkio-weight value Block IO (relative weight), between 10 and 1000
--blkio-weight-device value Block IO weight (relative device weight) (default [])
--cap-add value Add Linux capabilities (default [])
--cap-drop value Drop Linux capabilities (default [])
--cgroup-parent string Optional parent cgroup for the container
--cidfile string Write the container ID to the file
--cpu-count int The number of CPUs available for execution by the container.
Windows daemon only. On Windows Server containers, this is
approximated as a percentage of total CPU usage.
--cpu-percent int CPU percent (Windows only)
--cpu-period int Limit CPU CFS (Completely Fair Scheduler) period
--cpu-quota int Limit CPU CFS (Completely Fair Scheduler) quota
-c, --cpu-shares int CPU shares (relative weight)
--cpus NanoCPUs Number of CPUs (default 0.000)
--cpu-rt-period int Limit the CPU real-time period in microseconds
--cpu-rt-runtime int Limit the CPU real-time runtime in microseconds
--cpuset-cpus string CPUs in which to allow execution (0-3, 0,1)
--cpuset-mems string MEMs in which to allow execution (0-3, 0,1)
--device value Add a host device to the container (default [])
--device-cgroup-rule value Add a rule to the cgroup allowed devices list
--device-read-bps value Limit read rate (bytes per second) from a device (default [])
--device-read-iops value Limit read rate (IO per second) from a device (default [])
--device-write-bps value Limit write rate (bytes per second) to a device (default [])
--device-write-iops value Limit write rate (IO per second) to a device (default [])
--disable-content-trust Skip image verification (default true)
--dns value Set custom DNS servers (default [])
--dns-option value Set DNS options (default [])
--dns-search value Set custom DNS search domains (default [])
--entrypoint string Overwrite the default ENTRYPOINT of the image
-e, --env value Set environment variables (default [])
--env-file value Read in a file of environment variables (default [])
--expose value Expose a port or a range of ports (default [])
--group-add value Add additional groups to join (default [])
--health-cmd string Command to run to check health
--health-interval duration Time between running the check (ns|us|ms|s|m|h) (default 0s)
--health-retries int Consecutive failures needed to report unhealthy
--health-timeout duration Maximum time to allow one check to run (ns|us|ms|s|m|h) (default 0s)
--health-start-period duration Start period for the container to initialize before counting retries towards unstable (ns|us|ms|s|m|h) (default 0s)
--help Print usage
-h, --hostname string Container host name
--init Run an init inside the container that forwards signals and reaps processes
-i, --interactive Keep STDIN open even if not attached
--io-maxbandwidth string Maximum IO bandwidth limit for the system drive (Windows only)
--io-maxiops uint Maximum IOps limit for the system drive (Windows only)
--ip string IPv4 address (e.g., 172.30.100.104)
--ip6 string IPv6 address (e.g., 2001:db8::33)
--ipc string IPC namespace to use
--isolation string Container isolation technology
--kernel-memory string Kernel memory limit
-l, --label value Set meta data on a container (default [])
--label-file value Read in a line delimited file of labels (default [])
--link value Add link to another container (default [])
--link-local-ip value Container IPv4/IPv6 link-local addresses (default [])
--log-driver string Logging driver for the container
--log-opt value Log driver options (default [])
--mac-address string Container MAC address (e.g., 92:d0:c6:0a:29:33)
-m, --memory string Memory limit
--memory-reservation string Memory soft limit
--memory-swap string Swap limit equal to memory plus swap: '-1' to enable unlimited swap
--memory-swappiness int Tune container memory swappiness (0 to 100) (default -1)
--mount value Attach a filesytem mount to the container (default [])
--name string Assign a name to the container
--network-alias value Add network-scoped alias for the container (default [])
--network string Connect a container to a network (default "default")
'bridge': create a network stack on the default Docker bridge
'none': no networking
'container:<name|id>': reuse another container's network stack
'host': use the Docker host network stack
'<network-name>|<network-id>': connect to a user-defined network
--no-healthcheck Disable any container-specified HEALTHCHECK
--oom-kill-disable Disable OOM Killer
--oom-score-adj int Tune host's OOM preferences (-1000 to 1000)
--pid string PID namespace to use
--pids-limit int Tune container pids limit (set -1 for unlimited), kernel >= 4.3
--privileged Give extended privileges to this container
-p, --publish value Publish a container's port(s) to the host (default [])
-P, --publish-all Publish all exposed ports to random ports
--read-only Mount the container's root filesystem as read only
--restart string Restart policy to apply when a container exits (default "no")
Possible values are: no, on-failure[:max-retry], always, unless-stopped
--rm Automatically remove the container when it exits
--runtime string Runtime to use for this container
--security-opt value Security Options (default [])
--shm-size bytes 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.
--stop-signal string Signal to stop a container (default "SIGTERM")
--stop-timeout=10 Timeout (in seconds) to stop a container
--storage-opt value Storage driver options for the container (default [])
--sysctl value Sysctl options (default map[])
--tmpfs value Mount a tmpfs directory (default [])
-t, --tty Allocate a pseudo-TTY
--ulimit value Ulimit options (default [])
-u, --user string Username or UID (format: <name|uid>[:<group|gid>])
--userns string User namespace to use
'host': Use the Docker host user namespace
'': Use the Docker daemon user namespace specified by `--userns-remap` option.
--uts string UTS namespace to use
-v, --volume value Bind mount a volume (default []). The format
is `[host-src:]container-dest[:<options>]`.
The comma-delimited `options` are [rw|ro],
[z|Z], [[r]shared|[r]slave|[r]private],
[delegated|cached|consistent], and
[nocopy]. The 'host-src' is an absolute path
or a name value.
--volume-driver string Optional volume driver for the container
--volumes-from value Mount volumes from the specified container(s) (default [])
-w, --workdir string Working directory inside the container
Description
The docker create command 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.
This is useful when you want to set up a container configuration ahead of time
so that it is ready to start when you need it. The initial status of the
new container is created.
Please see the run command section and the Docker run reference for more details.
Examples
Create and start a container
$ docker create -t -i fedora bash
6d8af538ec541dd581ebc2a24153a28329acb5268abe5ef868c1f1a261221752
$ docker start -a -i 6d8af538ec5
bash-4.2#
Initialize volumes
As of v1.4.0 container volumes are initialized during the docker create phase
(i.e., docker run too). For example, this allows you to create the data
volume container, and then use it from another container:
$ docker create -v /data --name data ubuntu
240633dfbb98128fa77473d3d9018f6123b99c454b3251427ae190a7d951ad57
$ docker run --rm --volumes-from data ubuntu ls -la /data
total 8
drwxr-xr-x 2 root root 4096 Dec 5 04:10 .
drwxr-xr-x 48 root root 4096 Dec 5 04:11 ..
Similarly, create a host directory bind mounted volume container, which can
then be used from the subsequent container:
$ docker create -v /home/docker:/docker --name docker ubuntu
9aa88c08f319cd1e4515c3c46b0de7cc9aa75e878357b1e96f91e2c773029f03
$ docker run --rm --volumes-from docker ubuntu ls -la /docker
total 20
drwxr-sr-x 5 1000 staff 180 Dec 5 04:00 .
drwxr-xr-x 48 root root 4096 Dec 5 04:13 ..
-rw-rw-r-- 1 1000 staff 3833 Dec 5 04:01 .ash_history
-rw-r--r-- 1 1000 staff 446 Nov 28 11:51 .ashrc
-rw-r--r-- 1 1000 staff 25 Dec 5 04:00 .gitconfig
drwxr-sr-x 3 1000 staff 60 Dec 1 03:28 .local
-rw-r--r-- 1 1000 staff 920 Nov 28 11:51 .profile
drwx--S--- 2 1000 staff 460 Dec 5 00:51 .ssh
drwxr-xr-x 32 1000 staff 1140 Dec 5 04:01 docker
Set storage driver options per container.
$ docker create -it --storage-opt size=120G fedora /bin/bash
This (size) will allow to set the container rootfs size to 120G at creation time.
This option is only available for the devicemapper, btrfs, overlay2,
windowsfilter and zfs graph drivers.
For the devicemapper, btrfs, windowsfilter and zfs graph drivers,
user cannot pass a size less than the Default BaseFS Size.
For the overlay2 storage driver, the size option is only available if the
backing fs is xfs and mounted with the pquota mount option.
Under these conditions, user can pass any size less than the backing fs size.
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:
| Value | Description |
|---|---|
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 value if the |
daemon is running on Windows server, or hyperv if running on Windows client. |
|
process |
Namespace isolation only. |
hyperv |
Hyper-V hypervisor partition-based isolation. |
Specifying the --isolation flag without a value is the same as setting --isolation="default".
Dealing with dynamically created devices (--device-cgroup-rule)
Devices available to a container are assigned at creation time. The assigned devices will both be added to the cgroup.allow file and created into the container once it is run. This poses a problem when a new device needs to be added to running container.
One of the solution is to add a more permissive rule to a container
allowing it access to a wider range of devices. For example, supposing
our container needs access to a character device with major 42 and
any number of minor number (added as new devices appear), the
following rule would be added:
docker create --device-cgroup-rule='c 42:* rmw' -name my-container my-image
Then, a user could ask udev to execute a script that would docker exec my-container mknod newDevX c 42 <minor>
the required device when it is added.
NOTE: initially present devices still need to be explicitely added to the create/run command