Docker — Use "names generator" made by golang directly ( docker container default randomized name )

DOCKER.md

Docker — Use "names generator" made by golang directly ( docker container default randomized name )

"names generator" gives docker container default name which randomized but uniqued.

For busy people

Use binary file in this GIST repository.

$ git clone https://gist.github.com/YumaInaura/0c8de43e3342db53059584661d0b491e names-generator

$ ./names-generator/names-generator
affectionate_matsumoto
$ ./names-generator/names-generator
recursing_vaughan

( moby/LICENSE at master · moby/moby )

What is default name?

For example you can see default names in docker ps.

In below case docker contaners were named as …

• quizzical_payne
• sharp_pike
• optimistic_kepler

$ docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
dbd46a366aa3        alpine              "sleep 100"         2 seconds ago       Up 1 second                             optimistic_kepler
454ee02db352        alpine              "sleep 100"         3 seconds ago       Up 2 seconds                            sharp_pike
1d19cef9660b        alpine              "sleep 100"         4 seconds ago       Up 3 seconds                            quizzical_payne

"names generator" is made by go language

Include one humour in codes.

...
// GetRandomName generates a random name from the list of adjectives and surnames in this package
// formatted as "adjective_surname". For example 'focused_turing'. If retry is non-zero, a random
// integer between 0 and 10 will be added to the end of the name, e.g `focused_turing3`
func GetRandomName(retry int) string {
begin:
	name := fmt.Sprintf("%s_%s", left[rand.Intn(len(left))], right[rand.Intn(len(right))])
	if name == "boring_wozniak" /* Steve Wozniak is not boring */ {
		goto begin
	}

	if retry > 0 {
		name = fmt.Sprintf("%s%d", name, rand.Intn(10))
	}
	return name
}

• moby/names-generator.go at master · moby/moby
• moby/names-generator.go at 1fd7e4c28d3a4a21c3540f03a045f96a4190b527 · moby/moby

Example. Use names generator directly

Install

Probably it will take long time for downloading because docker/docker is large repository.

$ go get -v github.com/docker/docker/
github.com/docker/docker (download)

Move directory

$ cd $(go env GOPATH)/src/github.com/docker/docker/pkg/namesgenerator/

Run

$ go run cmd/names-generator/main.go
hungry_mccarthy

$ go run cmd/names-generator/main.go
mystifying_bhaskara

Build and run

$ go build -o ~/tmp/names-generator cmd/names-generator/main.go

$ ~/tmp/names-generator
quirky_lederberg

$ ~/tmp/names-generator
zen_torvalds

Versions

• Docker version 18.06.0-ce, build 0ffa825
• go version go1.10.3 darwin/amd64

Ref

• Golang — Show GOPATH in command ( $ go env GOPATH )
• How does Docker generate default container names? • my2cents
• alco/gostart: A getting started guide for Go newcomers

Links

• Qiita—Japanese
• Medium—imported

names-generator