create

Modified: 18 Aug 2016 16:34 UTC
Stability: Unknown

Creates a new container.

Usage: docker create [OPTIONS] IMAGE [COMMAND] [ARG...]

Create a new container

  -a, --attach=[]                  Attach to STDIN, STDOUT or STDERR
  --add-host=[]                    Add a custom host-to-IP mapping (host:ip)
  --blkio-weight=0                 Block IO weight (relative weight)
  -c, --cpu-shares=0               CPU shares (relative weight)
  --cap-add=[]                     Add Linux capabilities
  --cap-drop=[]                    Drop Linux capabilities
  --cgroup-parent=""               Optional parent cgroup for the container
  --cidfile=""                     Write the container ID to the file
  --cpuset-cpus=""                 CPUs in which to allow execution (0-3, 0,1)
  --cpuset-mems=""                 Memory nodes (MEMs) in which to allow execution (0-3, 0,1)
  --cpu-period=0                   Limit the CPU CFS (Completely Fair Scheduler) period
  --cpu-quota=0                    Limit the CPU CFS (Completely Fair Scheduler) quota
  --detach-keys                    Override the key sequence for detaching a container
  --device=[]                      Add a host device to the container
  --device-read-bps=[]             Limit read rate (bytes per second) from a device
  --device-read-iops=[]            Limit read rate (IO per second) from a device
  --device-write-bps=[]            Limit write rate (bytes per second) to a device
  --device-write-iops=[]           Limit write rate (IO per second) to a device
  --disable-content-trust=true     Skip image verification
  --dns=[]                         Set custom DNS servers
  --dns-opt=[]                     Set DNS options
  --dns-search=[]                  Set custom DNS search domains
  -e, --env=[]                     Set environment variables
  --entrypoint=""                  Overwrite the default ENTRYPOINT of the image
  --env-file=[]                    Read in a file of environment variables
  --expose=[]                      Expose a port or a range of ports
  -h, --hostname=""                Container host name
  --help=false                     Print usage
  -i, --interactive=false          Keep STDIN open even if not attached
  --ip                             Container IPv4 address (e.g. 172.30.100.104)
  --ip6                            Container IPv6 address (e.g. 2001:db8::33)
  --ipc=""                         IPC namespace to use
  --isolation                      Container isolation level
  --kernel-memory                  Kernel memory limit
  --link=[]                        Add link to another container
  --log-driver=""                  Logging driver for container
  --log-opt=[]                     Log driver specific options
  -l, --label=[]                   Set metadata on the container (e.g., --label=com.example.key=value)
  --label-file=[]                  Read in a file of labels (EOL delimited)
  -m, --memory=""                  Memory limit
  --mac-address=""                 Container MAC address (e.g. 92:d0:c6:0a:29:33)
  --memory-reservation             Memory soft limit
  --memory-swap=""                 Total memory (memory + swap), '-1' to disable swap
  --memory-swappiness=""           Tune a container's memory swappiness behavior. Accepts an integer between 0 and 100
  --name=""                        Assign a name to the container
  --network=default                Connect a container to a network
  --network-alias=[]               Add network-scoped alias for the container
  --oom-kill-disable=false         Whether to disable OOM Killer for the container or not
  --oom-score-adj                  Tune host's OOM preferences (-1000 to 1000)
  -P, --publish-all=false          Publish all exposed ports to random ports
  -p, --publish=[]                 Publish a container's port(s) to the host
  --pid=""                         PID namespace to use
  --privileged=false               Give extended privileges to this container
  --read-only=false                Mount the container's root filesystem as read only
  --restart="no"                   Restart policy (no, on-failure[:max-retry], always)
  --security-opt=[]                Security Options
  --shm-size                       Size of /dev/shm, default value is 64MB
  -t, --tty=false                  Allocate a pseudo-TTY
  --tmpfs=[]                       Mount a tmpfs directory
  -u, --user=""                    Username or UID (format: <name|uid>[:<group|gid>])
  --ulimit=[]                      Ulimit options
  --uts=""                         UTS namespace to use
  -v, --volume=[]                  Bind mount a volume
  --volume-driver                  Optional volume driver for the container
  --volumes-from=[]                Mount volumes from the specified container(s)
  -w, --workdir=""                 Working directory inside the container

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.

Please see the run command section and the Docker run reference for more details.

Examples

$ docker create -t -i fedora bash
6d8af538ec541dd581ebc2a24153a28329acb5268abe5ef868c1f1a261221752
$ docker start -a -i 6d8af538ec5
bash-4.2#

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

Divergence

Triton's secure, multi-tenant, container-native environment imposes some differences from Docker Inc's implementation. Notably, arguments to control LXC or change container privilege are unsupported. Other arguments, such as those to manage CPU allocation, or networking, are more effective because of features unique to Triton. See the Resources and Networks documentation for more information on how to size containers and assign public or private IP addresses to them.

Docker Swarm's affinity filters for controlling on which server a container is provisioned are supported. See the placement feature documentation for details.

Please contact Joyent support or file a ticket if you discover any additional divergence.