docker-machine: command not found

先日まで使えていたはずのdocker-machineコマンドが急に今日使えなくなっていた。

$ docker-machine ls
-bash: docker-machine: command not found

使えなくなった原因は分かっていないですが、Install Docker Machineを参考に以下のコマンドを実行してインストールし直して無事docker-machineコマンドを使用できるようになりました。

$ base=https://github.com/docker/machine/releases/download/v0.16.0 &&
>   curl -L $base/docker-machine-$(uname -s)-$(uname -m) >/usr/local/bin/docker-machine &&
>   chmod +x /usr/local/bin/docker-machine

$ docker-machine
Usage: docker-machine [OPTIONS] COMMAND [arg...]

Create and manage machines running Docker.

Version: 0.16.0, build 702c267f

Author:
  Docker Machine Contributors - <https://github.com/docker/machine>

Options:
  --debug, -D						Enable debug mode
  --storage-path, -s "/Users/shinichi/.docker/machine"	Configures storage path [$MACHINE_STORAGE_PATH]
  --tls-ca-cert 					CA to verify remotes against [$MACHINE_TLS_CA_CERT]
  --tls-ca-key 						Private key to generate certificates [$MACHINE_TLS_CA_KEY]
  --tls-client-cert 					Client cert to use for TLS [$MACHINE_TLS_CLIENT_CERT]
  --tls-client-key 					Private key used in client TLS auth [$MACHINE_TLS_CLIENT_KEY]
  --github-api-token 					Token to use for requests to the Github API [$MACHINE_GITHUB_API_TOKEN]
  --native-ssh						Use the native (Go-based) SSH implementation. [$MACHINE_NATIVE_SSH]
  --bugsnag-api-token 					BugSnag API token for crash reporting [$MACHINE_BUGSNAG_API_TOKEN]
  --help, -h						show help
  --version, -v						print the version

Commands:
  active		Print which machine is active
  config		Print the connection config for machine
  create		Create a machine
  env			Display the commands to set up the environment for the Docker client
  inspect		Inspect information about a machine
  ip			Get the IP address of a machine
  kill			Kill a machine
  ls			List machines
  provision		Re-provision existing machines
  regenerate-certs	Regenerate TLS Certificates for a machine
  restart		Restart a machine
  rm			Remove a machine
  ssh			Log into or run a command on a machine with SSH.
  scp			Copy files between machines
  mount			Mount or unmount a directory from a machine with SSHFS.
  start			Start a machine
  status		Get the status of a machine
  stop			Stop a machine
  upgrade		Upgrade a machine to the latest version of Docker
  url			Get the URL of a machine
  version		Show the Docker Machine version or a machine docker version
  help			Shows a list of commands or help for one command

Run 'docker-machine COMMAND --help' for more information on a command.