mirror of https://github.com/docker/cli.git
Merge pull request #3450 from thaJeztah/docs_unify_run_create
docs: unify "docker create" and "docker run" reference
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Sebastiaan van Stijn
GitHub
commit
7dcd85007b
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@ -135,35 +135,51 @@ Options:
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## Description
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The `docker create` command creates a writeable container layer over the
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specified image and prepares it for running the specified command. The
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The `docker container create` (or shorthand: `docker create`) command creates a
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new container from the specified image, without starting it.
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When creating a container, the docker daemon creates a writeable container layer
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over the specified image and prepares it for running the specified command. The
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container ID is then printed to `STDOUT`. This is similar to `docker run -d`
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except the container is never started. You can then use the
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`docker start <container_id>` command to start the container at any point.
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except the container is never started. You can then use the `docker container start`
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(or shorthand: `docker start`) command to start the container at any point.
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This is useful when you want to set up a container configuration ahead of time
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so that it is ready to start when you need it. The initial status of the
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new container is `created`.
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Please see the [run command](run.md) section and the [Docker run reference](../run.md) for more details.
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The `docker create` command shares most of its options with the `docker run`
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command (which performs a `docker create` before starting it). Refer to the
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[`docker run` command](run.md) section and the [Docker run reference](../run.md)
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for details on the available flags and options.
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## Examples
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### Create and start a container
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```console
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$ docker create -t -i fedora bash
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The following example creates an interactive container with a pseudo-TTY attached,
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then starts the container and attaches to it:
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```console
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$ docker container create -i -t --name mycontainer alpine
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6d8af538ec541dd581ebc2a24153a28329acb5268abe5ef868c1f1a261221752
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$ docker start -a -i 6d8af538ec5
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$ docker container start --attach -i mycontainer
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/ # echo hello world
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hello world
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```
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bash-4.2#
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The above is the equivalent of a `docker run`:
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```console
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$ docker run -it --name mycontainer2 alpine
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/ # echo hello world
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hello world
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```
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### Initialize volumes
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As of v1.4.0 container volumes are initialized during the `docker create` phase
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Container volumes are initialized during the `docker create` phase
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(i.e., `docker run` too). For example, this allows you to `create` the `data`
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volume container, and then use it from another container:
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@ -200,58 +216,3 @@ drwxr-sr-x 3 1000 staff 60 Dec 1 03:28 .local
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drwx--S--- 2 1000 staff 460 Dec 5 00:51 .ssh
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drwxr-xr-x 32 1000 staff 1140 Dec 5 04:01 docker
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```
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Set storage driver options per container.
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```console
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$ docker create -it --storage-opt size=120G fedora /bin/bash
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```
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This (size) will allow to set the container rootfs size to 120G at creation time.
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This option is only available for the `devicemapper`, `btrfs`, `overlay2`,
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`windowsfilter` and `zfs` graph drivers.
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For the `devicemapper`, `btrfs`, `windowsfilter` and `zfs` graph drivers,
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user cannot pass a size less than the Default BaseFS Size.
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For the `overlay2` storage driver, the size option is only available if the
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backing fs is `xfs` and mounted with the `pquota` mount option.
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Under these conditions, user can pass any size less than the backing fs size.
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### Specify isolation technology for container (--isolation)
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This option is useful in situations where you are running Docker containers on
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Windows. The `--isolation=<value>` option sets a container's isolation
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technology. On Linux, the only supported is the `default` option which uses
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Linux namespaces. On Microsoft Windows, you can specify these values:
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| Value | Description |
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| --------- | ------------------------------------------------------------ |
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| `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. |
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| `process` | Namespace isolation only. |
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| `hyperv` | Hyper-V hypervisor partition-based isolation. |
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Specifying the `--isolation` flag without a value is the same as setting `--isolation="default"`.
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### Dealing with dynamically created devices (--device-cgroup-rule)
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Devices available to a container are assigned at creation time. The
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assigned devices will both be added to the cgroup.allow file and
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created into the container once it is run. This poses a problem when
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a new device needs to be added to running container.
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One of the solutions is to add a more permissive rule to a container
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allowing it access to a wider range of devices. For example, supposing
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our container needs access to a character device with major `42` and
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any number of minor number (added as new devices appear), the
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following rule would be added:
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```console
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$ docker create --device-cgroup-rule='c 42:* rmw' -name my-container my-image
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```
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Then, a user could ask `udev` to execute a script that would `docker exec my-container mknod newDevX c 42 <minor>`
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the required device when it is added.
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NOTE: initially present devices still need to be explicitly added to
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the create/run command
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@ -653,9 +653,32 @@ PS C:\> docker run --device=class/86E0D1E0-8089-11D0-9CE4-08003E301F73 mcr.micro
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> This option fails if the container isolation is `hyperv` or when running Linux
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> Containers on Windows (LCOW).
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### <a name="device-cgroup-rule"></a> Using dynamically created devices (--device-cgroup-rule)
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Devices available to a container are assigned at creation time. The
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assigned devices will both be added to the cgroup.allow file and
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created into the container once it is run. This poses a problem when
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a new device needs to be added to running container.
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One of the solutions is to add a more permissive rule to a container
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allowing it access to a wider range of devices. For example, supposing
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our container needs access to a character device with major `42` and
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any number of minor number (added as new devices appear), the
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following rule would be added:
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```console
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$ docker run -d --device-cgroup-rule='c 42:* rmw' -name my-container my-image
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```
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Then, a user could ask `udev` to execute a script that would `docker exec my-container mknod newDevX c 42 <minor>`
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the required device when it is added.
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> **Note**: initially present devices still need to be explicitly added to the
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> `docker run` / `docker create` command.
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### Access an NVIDIA GPU
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The `--gpus` flag allows you to access NVIDIA GPU resources. First you need to
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The `--gpus` flag allows you to access NVIDIA GPU resources. First you need to
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install [nvidia-container-runtime](https://nvidia.github.io/nvidia-container-runtime/).
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Visit [Specify a container's resources](https://docs.docker.com/config/containers/resource_constraints/)
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for more information.
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@ -819,9 +842,9 @@ and 30 seconds for Windows containers.
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### Specify isolation technology for container (--isolation)
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This option is useful in situations where you are running Docker containers on
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Windows. The `--isolation <value>` option sets a container's isolation technology.
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On Linux, the only supported is the `default` option which uses
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Linux namespaces. These two commands are equivalent on Linux:
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Windows. The `--isolation=<value>` option sets a container's isolation technology.
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On Linux, the only supported is the `default` option which uses Linux namespaces.
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These two commands are equivalent on Linux:
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```console
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$ docker run -d busybox top
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@ -830,16 +853,15 @@ $ docker run -d --isolation default busybox top
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On Windows, `--isolation` can take one of these values:
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| Value | Description |
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|:----------|:------------------------------------------------------------------------------------------------------------------|
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|:----------|:-------------------------------------------------------------------------------------------|
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| `default` | Use the value specified by the Docker daemon's `--exec-opt` or system default (see below). |
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| `process` | Shared-kernel namespace isolation (not supported on Windows client operating systems older than Windows 10 1809). |
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| `process` | Shared-kernel namespace isolation. |
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| `hyperv` | Hyper-V hypervisor partition-based isolation. |
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The default isolation on Windows server operating systems is `process`. The default
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isolation on Windows client operating systems is `hyperv`. An attempt to start a container on a client
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operating system older than Windows 10 1809 with `--isolation process` will fail.
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The default isolation on Windows server operating systems is `process`, and `hyperv`
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on Windows client operating systems, such as Windows 10. Process isolation is more
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performant, but requires the image to
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On Windows server, assuming the default configuration, these commands are equivalent
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and result in `process` isolation:
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