docker utilities: toolbox to help work efficiently with docker. It provides three functionality.

• Remove untagged images locally from docker, to free up spaces.

• Deletes containers with "exited" status.

• Flatten the docker Image i.e. merges the layers of docker image, to save space.

  • NOTE: This utility, do deletes original image.

  Below is help from docker-utils

  $ ./docker-utils --help
  NAME:
     docker-utils - Toolchain for docker
  
  USAGE:
     docker-utils [global options] command [command options] [arguments...]
  
  VERSION:
      0.1.0
  
  COMMANDS:
      rmi          deletes the docker images
      rm           deletes docker containers
      flatten      Compacts the images by flattening
      help, h      Shows a list of commands or help for one command
  
      GLOBAL OPTIONS:
        --help, -h           show help
        --version, -v        print the version
  

To remove untagged images, "rmi" subcommand is provided.

• --untagged flag is mandatory flag to be passed with this subcommand.
• --dry flag, shows, the images that will be deleted, but no deletion happens.

$ ./docker-utils rmi --help
NAME:
   rmi - deletes the docker images

   USAGE:
      command rmi [command options] [arguments...]

   OPTIONS:
      --dry        [Optional] dry_run the command
      --untagged   [Required] deletes untagged images

example $ docker-utils rmi --untagged

To remove exited or killed images, "rmi" subcommand is provided.

• --exited flag is mandatory flag to be passed with this subcommand.
• --dry flag, shows, the conatiners that will be deleted, but no deletion happens.

$ ./docker-utils rm --help
NAME:
   rm - deletes docker containers

   USAGE:
      command rm [command options] [arguments...]

   OPTIONS:
      --dry        [Optional] dry_run the command
      --exited     [Required] deletes exited containers

example $ docker-utils rm --exited

To flatten any image, flatten subcommand is used.

• Here --image is actual name of image in format : need to be provided.
• --name is new name which will be used while importing the image.
• --tag is new tag which will be used while importing the image.

$ ./docker-utils flatten --help
NAME:
   flatten - Compacts the images by flattening

   USAGE:
      command flatten [command options] [arguments...]

   OPTIONS:
      --image      [Required] Image file to flatten
      --name       [Required] New name of Image file
      --tag        [Required] tag for new image

example $docker-utils flatten --image centos:latest --name kk/centos --tag:7