NAME

       HOME/.docker/config.json - Default Docker configuration file

INTRODUCTION

       By  default,  the Docker command line stores its configuration files in a directory called .docker within
       your $HOME directory.  Docker manages most of the files in the configuration directory and you should not
       modify them.  However, you can modify the config.json file to control certain aspects of how  the  docker
       command behaves.

       Currently,  you  can  modify  the  docker  command  behavior  using environment variables or command-line
       options. You can also use options within config.json to modify some of  the  same  behavior.  When  using
       these mechanisms, you must keep in mind the order of precedence among them. Command line options override
       environment variables and environment variables override properties you specify in a config.json file.

       The config.json file stores a JSON encoding of several properties:

       • The  HttpHeaders  property  specifies  a set of headers to include in all messages sent from the Docker
         client to the daemon. Docker does not try to interpret or understand these header; it simply puts  them
         into the messages. Docker does not allow these headers to change any headers it sets for itself.

       • The psFormat property specifies the default format for docker ps output.  When the --format flag is not
         provided  with  the docker ps command, Docker's client uses this property. If this property is not set,
         the client falls back to the default table format. For a list of supported formatting  directives,  see
         docker-ps(1).

       • The  detachKeys  property  specifies  the  default  key sequence which detaches the container. When the
         --detach-keys flag is not provide with the docker attach, docker exec,  docker  run  or  docker  start,
         Docker's  client  uses this property. If this property is not set, the client falls back to the default
         sequence ctrl-p,ctrl-q.

       • The imagesFormat property  specifies the default format for docker images  output.  When  the  --format
         flag  is  not  provided  with  the  docker  images command, Docker's client uses this property. If this
         property is not set, the client falls back to the  default  table  format.  For  a  list  of  supported
         formatting directives, see docker-images(1).

       You  can  specify  a  different  location  for  the configuration files via the DOCKER_CONFIG environment
       variable or the --config command line option. If both are specified, then the --config  option  overrides
       the DOCKER_CONFIG environment variable:

       docker --config ~/testconfigs/ ps

       This command instructs Docker to use the configuration files in the ~/testconfigs/ directory when running
       the ps command.

Examples

       Following is a sample config.json file:

       {
         "HttpHeaders": {
           "MyHeader": "MyValue"
         },
         "psFormat": "table {{.ID}}\\t{{.Image}}\\t{{.Command}}\\t{{.Labels}}",
         "imagesFormat": "table {{.ID}}\\t{{.Repository}}\\t{{.Tag}}\\t{{.CreatedAt}}",
         "detachKeys": "ctrl-e,e"
       }

HISTORY

       January 2016, created by Moxiegirl mary@docker.com ⟨mailto:mary@docker.com⟩

Docker Community                                  JANUARY 2016                                    CONFIG.JSON(5)