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181e60499f
This adds the currently selected "docker context" to the output
of "docker version", which allows users to see which context
is selected to produce the version output, and can be used (for
example), to set the prompt to the currently selected context:
(in `~/.bashrc`):
```bash
function docker_context_prompt() {
PS1="context: $(docker version --format='{{.Client.Context}}')> "
}
PROMPT_COMMAND=docker_context_prompt
```
After reloading the `~/.bashrc`, the prompt now shows the currently selected
`docker context`:
```bash
$ source ~/.bashrc
context: default> docker context create --docker host=unix:///var/run/docker.sock my-context
my-context
Successfully created context "my-context"
context: default> docker context use my-context
my-context
Current context is now "my-context"
context: my-context> docker context use default
default
Current context is now "default"
context: default>
```
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
124 lines
4.0 KiB
Markdown
124 lines
4.0 KiB
Markdown
---
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title: "version"
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description: "The version command description and usage"
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keywords: "version, architecture, api"
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---
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# version
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```markdown
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Usage: docker version [OPTIONS]
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Show the Docker version information
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Options:
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-f, --format string Format the output using the given Go template
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--help Print usage
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--kubeconfig string Kubernetes config file
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```
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## Description
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By default, this will render all version information in an easy to read
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layout. If a format is specified, the given template will be executed instead.
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Go's [text/template](http://golang.org/pkg/text/template/) package
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describes all the details of the format.
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## Examples
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### Default output
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```bash
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$ docker version
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Client:
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Version: 19.03.8
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API version: 1.40
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Go version: go1.12.17
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Git commit: afacb8b
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Built: Wed Mar 11 01:21:11 2020
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OS/Arch: darwin/amd64
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Context: default
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Experimental: true
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Server:
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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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Experimental: true
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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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### Get the server version
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```bash
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$ docker version --format '{{.Server.Version}}'
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19.03.8
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```
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### Dump raw JSON data
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```bash
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$ docker version --format '{{json .}}'
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{"Client":{"Platform":{"Name":"Docker Engine - Community"},"Version":"19.03.8","ApiVersion":"1.40","DefaultAPIVersion":"1.40","GitCommit":"afacb8b","GoVersion":"go1.12.17","Os":"darwin","Arch":"amd64","BuildTime":"Wed Mar 11 01:21:11 2020","Experimental":true},"Server":{"Platform":{"Name":"Docker Engine - Community"},"Components":[{"Name":"Engine","Version":"19.03.8","Details":{"ApiVersion":"1.40","Arch":"amd64","BuildTime":"Wed Mar 11 01:29:16 2020","Experimental":"true","GitCommit":"afacb8b","GoVersion":"go1.12.17","KernelVersion":"4.19.76-linuxkit","MinAPIVersion":"1.12","Os":"linux"}},{"Name":"containerd","Version":"v1.2.13","Details":{"GitCommit":"7ad184331fa3e55e52b890ea95e65ba581ae3429"}},{"Name":"runc","Version":"1.0.0-rc10","Details":{"GitCommit":"dc9208a3303feef5b3839f4323d9beb36df0a9dd"}},{"Name":"docker-init","Version":"0.18.0","Details":{"GitCommit":"fec3683"}}],"Version":"19.03.8","ApiVersion":"1.40","MinAPIVersion":"1.12","GitCommit":"afacb8b","GoVersion":"go1.12.17","Os":"linux","Arch":"amd64","KernelVersion":"4.19.76-linuxkit","Experimental":true,"BuildTime":"2020-03-11T01:29:16.000000000+00:00"}}
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```
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### Print the current context
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The following example prints the currently used [`docker context`](context.md):
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```bash
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$ docker version --format='{{.Client.Context}}'
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default
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```
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As an example, this output can be used to dynamically change your shell prompt
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to indicate your active context. The example below illustrates how this output
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could be used when using Bash as your shell.
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Declare a function to obtain the current context in your `~/.bashrc`, and set
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this command as your `PROMPT_COMMAND`
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```bash
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function docker_context_prompt() {
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PS1="context: $(docker version --format='{{.Client.Context}}')> "
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}
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PROMPT_COMMAND=docker_context_prompt
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```
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After reloading the `~/.bashrc`, the prompt now shows the currently selected
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`docker context`:
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```bash
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$ source ~/.bashrc
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context: default> docker context create --docker host=unix:///var/run/docker.sock my-context
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my-context
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Successfully created context "my-context"
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context: default> docker context use my-context
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my-context
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Current context is now "my-context"
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context: my-context> docker context use default
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default
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Current context is now "default"
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context: default>
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```
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Refer to the [`docker context` section](context.md) in the command line reference
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for more information about `docker context`.
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