docker-config-json(5)

CONFIG.JSON(5)                   JANUARY 2016                   CONFIG.JSON(5)

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:

              o

              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.

              o

              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).

              o

              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.

              o

              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>

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