mirror of https://github.com/docker/cli.git
186 lines
6.3 KiB
Markdown
186 lines
6.3 KiB
Markdown
# version
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<!---MARKER_GEN_START-->
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Show the Docker version information
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### Options
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| Name | Type | Default | Description |
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|:---------------------------------------|:---------|:--------|:-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| [`-f`](#format), [`--format`](#format) | `string` | | Format output using a custom template:<br>'json': Print in JSON format<br>'TEMPLATE': Print output using the given Go template.<br>Refer to https://docs.docker.com/go/formatting/ for more information about formatting output with templates |
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<!---MARKER_GEN_END-->
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## Description
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The version command prints the current version number for all independently
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versioned Docker components. Use the [`--format`](#format) option to customize
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the output.
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The version command (`docker version`) outputs the version numbers of Docker
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components, while the `--version` flag (`docker --version`) outputs the version
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number of the Docker CLI you are using.
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### Default output
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The default output renders all version information divided into two sections;
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the `Client` section contains information about the Docker CLI and client
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components, and the `Server` section contains information about the Docker
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Engine and components used by the Docker Engine, such as the containerd and runc
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OCI Runtimes.
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The information shown may differ depending on how you installed Docker and
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what components are in use. The following example shows the output on a macOS
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machine running Docker Desktop:
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```console
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$ docker version
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Client: Docker Engine - Community
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Version: 23.0.3
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API version: 1.42
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Go version: go1.19.7
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Git commit: 3e7cbfd
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Built: Tue Apr 4 22:05:41 2023
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OS/Arch: darwin/amd64
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Context: default
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Server: Docker Desktop 4.19.0 (12345)
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Engine:
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Version: 23.0.3
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API version: 1.42 (minimum version 1.12)
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Go version: go1.19.7
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Git commit: 59118bf
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Built: Tue Apr 4 22:05:41 2023
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OS/Arch: linux/amd64
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Experimental: false
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containerd:
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Version: 1.6.20
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GitCommit: 2806fc1057397dbaeefbea0e4e17bddfbd388f38
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runc:
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Version: 1.1.5
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GitCommit: v1.1.5-0-gf19387a
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docker-init:
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Version: 0.19.0
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GitCommit: de40ad0
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```
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### Client and server versions
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Docker uses a client/server architecture, which allows you to use the Docker CLI
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on your local machine to control a Docker Engine running on a remote machine,
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which can be (for example) a machine running in the cloud or inside a virtual machine.
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The following example switches the Docker CLI to use a [context](context.md)
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named `remote-test-server`, which runs an older version of the Docker Engine
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on a Linux server:
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```console
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$ docker context use remote-test-server
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remote-test-server
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$ docker version
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Client: Docker Engine - Community
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Version: 23.0.3
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API version: 1.40 (downgraded from 1.42)
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Go version: go1.19.7
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Git commit: 3e7cbfd
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Built: Tue Apr 4 22:05:41 2023
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OS/Arch: darwin/amd64
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Context: remote-test-server
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Server: Docker Engine - Community
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Engine:
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Version: 19.03.8
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API version: 1.40 (minimum version 1.12)
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Go version: go1.12.17
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Git commit: afacb8b
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Built: Wed Mar 11 01:29:16 2020
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OS/Arch: linux/amd64
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containerd:
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Version: v1.2.13
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GitCommit: 7ad184331fa3e55e52b890ea95e65ba581ae3429
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runc:
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Version: 1.0.0-rc10
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GitCommit: dc9208a3303feef5b3839f4323d9beb36df0a9dd
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docker-init:
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Version: 0.18.0
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GitCommit: fec3683
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```
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### API version and version negotiation
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The API version used by the client depends on the Docker Engine that the Docker
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CLI is connecting with. When connecting with the Docker Engine, the Docker CLI
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and Docker Engine perform API version negotiation, and select the highest API
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version that is supported by both the Docker CLI and the Docker Engine.
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For example, if the CLI is connecting with Docker Engine version 19.03, it downgrades
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to API version 1.40 (refer to the [API version matrix](https://docs.docker.com/engine/api/#api-version-matrix)
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to learn about the supported API versions for Docker Engine):
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```console
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$ docker version --format '{{.Client.APIVersion}}'
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1.40
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```
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Be aware that API version can also be overridden using the `DOCKER_API_VERSION`
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environment variable, which can be useful for debugging purposes, and disables
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API version negotiation. The following example illustrates an environment where
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the `DOCKER_API_VERSION` environment variable is set. Unsetting the environment
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variable removes the override, and re-enables API version negotiation:
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```console
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$ env | grep DOCKER_API_VERSION
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DOCKER_API_VERSION=1.39
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$ docker version --format '{{.Client.APIVersion}}'
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1.39
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$ unset DOCKER_API_VERSION
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$ docker version --format '{{.Client.APIVersion}}'
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1.42
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```
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## Examples
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### <a name="format"></a> Format the output (--format)
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The formatting option (`--format`) pretty-prints the output using a Go template,
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which allows you to customize the output format, or to obtain specific information
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from the output. Refer to the [format command and log output](https://docs.docker.com/config/formatting/)
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page for details of the format.
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### Get the server version
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```console
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$ docker version --format '{{.Server.Version}}'
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23.0.3
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```
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### Get the client API version
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The following example prints the API version that is used by the client:
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```console
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$ docker version --format '{{.Client.APIVersion}}'
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1.42
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```
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The version shown is the API version that is negotiated between the client
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and the Docker Engine. Refer to [API version and version negotiation](#api-version-and-version-negotiation)
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above for more information.
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### Dump raw JSON data
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```console
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$ docker version --format '{{json .}}'
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{"Client":"Version":"23.0.3","ApiVersion":"1.42", ...}
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```
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