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introduce context show command

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Signed-off-by: Nicolas De Loof <nicolas.deloof@gmail.com>
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Nicolas De Loof
2022-04-25 10:52:18 +02:00
parent 0b78efe8fe
commit e9a4d7e611
7 changed files with 115 additions and 45 deletions
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docs/reference/commandline/context_show.md Normal file
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---
title: "context show"
description: "The context show command description and usage"
keywords: "context, show"
---
# context show
```markdown
Usage: docker context show
Print the name of the current context
```
## Description
Print the name of the current context, possibly set by `DOCKER_CONTEXT` environment
variable or `--context` global option.
## Examples
### Print the current context
The following example prints the currently used [`docker context`](context.md):
```console
$ docker context show'
default
```
As an example, this output can be used to dynamically change your shell prompt
to indicate your active context. The example below illustrates how this output
could be used when using Bash as your shell.
Declare a function to obtain the current context in your `~/.bashrc`, and set
this command as your `PROMPT_COMMAND`
```console
function docker_context_prompt() {
PS1="context: $(docker context show)> "
}
PROMPT_COMMAND=docker_context_prompt
```
After reloading the `~/.bashrc`, the prompt now shows the currently selected
`docker context`:
```console
$ 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>
```

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docs/reference/commandline/version.md
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@ -76,47 +76,3 @@ $ docker version --format '{{json .}}'
{"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"}}
```
### Print the current context
The following example prints the currently used [`docker context`](context.md):
```console
$ docker version --format='{{.Client.Context}}'
default
```
As an example, this output can be used to dynamically change your shell prompt
to indicate your active context. The example below illustrates how this output
could be used when using Bash as your shell.
Declare a function to obtain the current context in your `~/.bashrc`, and set
this command as your `PROMPT_COMMAND`
```console
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`:
```console
$ 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>
```
Refer to the [`docker context` section](context.md) in the command line reference
for more information about `docker context`.