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Merge pull request #3581 from thaJeztah/docs_version_update_examples 

docs: reference: version: improve description
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Sebastiaan van Stijn 2022-06-27 10:55:50 +02:00 committed by GitHub
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@ -18,30 +18,84 @@ Options:
## Description
By default, this will render all version information in an easy to read
layout. If a format is specified, the given template will be executed instead.
The version command prints the current version number for all independently
versioned Docker components. Use the [`--format`](#format) option to customize
the output.
Go's [text/template](https://golang.org/pkg/text/template/) package
describes all the details of the format.
## Examples
The version command (`docker version`) outputs the version numbers of Docker
components, while the `--version` flag (`docker --version`) outputs the version
number of the Docker CLI you are using.
### Default output
The default output renders all version information divided into two sections;
the "Client" section contains information about the Docker CLI and client
components, and the "Server" section contains information about the Docker
Engine and components used by the Engine, such as the "Containerd" and "Runc"
OCI Runtimes.
The information shown may differ depending on how you installed Docker and
what components are in use. The following example shows the output on a macOS
machine running Docker Desktop:
```console
$ docker version
Client:
Version: 19.03.8
API version: 1.40
Go version: go1.12.17
Git commit: afacb8b
Built: Wed Mar 11 01:21:11 2020
Version: 20.10.16
API version: 1.41
Go version: go1.17.10
Git commit: aa7e414
Built: Thu May 12 09:17:28 2022
OS/Arch: darwin/amd64
Context: default
Experimental: true
Server:
Server: Docker Desktop 4.8.2 (77141)
Engine:
Version: 20.10.16
API version: 1.41 (minimum version 1.12)
Go version: go1.17.10
Git commit: f756502
Built: Thu May 12 09:15:33 2022
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.6.4
GitCommit: 212e8b6fa2f44b9c21b2798135fc6fb7c53efc16
runc:
Version: 1.1.1
GitCommit: v1.1.1-0-g52de29d
docker-init:
Version: 0.19.0
GitCommit: de40ad0
```
### Client and server versions
Docker uses a client/server architecture, which allows you to use the Docker CLI
on your local machine to control a Docker Engine running on a remote machine,
which can be (for example) a machine running in the Cloud or inside a Virtual Machine.
The following example switches the Docker CLI to use a [context](context.md)
named "remote-test-server", which runs an older version of the Docker Engine
on a Linux server:
```console
$ docker context use remote-test-server
remote-test-server
$ docker version
Client:
Version: 20.10.16
API version: 1.40 (downgraded from 1.41)
Go version: go1.17.10
Git commit: aa7e414
Built: Thu May 12 09:17:28 2022
OS/Arch: darwin/amd64
Context: remote-test-server
Server: Docker Engine - Community
Engine:
Version: 19.03.8
API version: 1.40 (minimum version 1.12)
@ -49,7 +103,6 @@ Server:
Git commit: afacb8b
Built: Wed Mar 11 01:29:16 2020
OS/Arch: linux/amd64
Experimental: true
containerd:
Version: v1.2.13
GitCommit: 7ad184331fa3e55e52b890ea95e65ba581ae3429
@ -61,22 +114,72 @@ Server:
GitCommit: fec3683
```
### API version and version negotiation
The API version used by the client depends on the Docker Engine that the Docker
CLI is connecting with. When connecting with the Docker Engine, the Docker CLI
and Docker Engine perform API version negotiation, and select the highest API
version that is supported by both the Docker CLI and the Docker Engine.
For example, if the CLI is connecting with a Docker 19.03 engine, it downgrades
to API version 1.40 (refer to the [API version matrix](https://docs.docker.com/engine/api/#api-version-matrix)
to learn about the supported API versions for Docker Engine):
```console
$ docker version --format '{{.Client.APIVersion}}'
1.40
```
Be aware that API version can also be overridden using the `DOCKER_API_VERSION`
environment variable, which can be useful for debugging purposes, and disables
API version negotiation. The following example illustrates an environment where
the `DOCKER_API_VERSION` environment variable is set. Unsetting the environment
variable removes the override, and re-enables API version negotiation:
```console
$ env | grep DOCKER_API_VERSION
DOCKER_API_VERSION=1.39
$ docker version --format '{{.Client.APIVersion}}'
1.39
$ unset DOCKER_API_VERSION
$ docker version --format '{{.Client.APIVersion}}'
1.41
```
## Examples
### <a name=format></a> Format the output (--format)
The formatting option (`--format`) pretty-prints the output using a Go template,
which allows you to customize the output format, or to obtain specific information
from the output. Refer to the [format command and log output](https://docs.docker.com/config/formatting/)
page for details of the format.
### Get the server version
```console
$ docker version --format '{{.Server.Version}}'
19.03.8
20.10.16
```
### Get the client API version
The following example prints the API version that is used by the client:
```console
$ docker version --format '{{.Client.APIVersion}}'
1.41
```
The version shown is the API version that is negotiated between the client
and the Docker Engine. Refer to [API version and version negotiation](#api-version-and-version-negotiation)
above for more information.
### Dump raw JSON data
```console