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⟩