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You can connect to web applications installed on your workspace using the applications specification file located at /coder/apps/config.yaml of the workspace filesystem.

Application Launcher

Enabling custom apps

If you'd like to use custom apps in Coder, you can enable this feature in the UI:

  1. In the top-right, click on your avatar and select Feature Preview.
  2. Click Workspace applications and select Enable.

Application specification file

To define custom applications, add a configuration file at /coder/apps/config.yaml to your image.

The config file specifies the parameters Coder requires in order to launch the application. Within the file, you can specify the following for each application:

# /coder/apps/config.yaml

apps:
  # Name of application in launcher. Name may consist of alphanumeric
  # characters, dashes, underscores. Names must begin with an alphanumeric
  # character. Names must be unique per application. Required.
  - name: projector
    # Application scheme - must be http or https. Required.
    scheme: http
    # Application port. Required.
    port: 9999
    # Host of the application to use when dialing. Defaults to localhost.
    # Optional.
    host: "localhost"
    # Working directory for the start command. Required.
    working-directory: /home/coder
    # File path to icon used in application launcher. Icons should be either
    # PNG, SVG, or JPG. Required.
    icon-path: /home/coder/goland.svg
    # Command to start the application. Required.
    command: /home/coder/.local/bin/projector
    # Array of arguments for command. Optional.
    args: ["run"]
    # Health checks to get running application status. Can use exec or http
    # health checks to localhost. It is recommended to specify a health-check
    # although not strictly required. If one is not supplied then an http
    # request is sent to the application root path "/".
    health-check:
      # Exec commands require an exit code of '0' to report healthy.
      exec:
        command: "pgrep"
        args: ["projector"]
      # http sends a GET request to the address specified via the parameters.
      # It expects a 200 status code to report healthy.
      http:
        # Scheme must be "http" or "https". If not specified it inherits
        # the application scheme. Optional.
        scheme: "http"
        # The host to use when dialing the address. If not specified it
        # inherits the application host. Optional.
        host: "localhost"
        # Port to use when dialing the application. If not specified it
        # inherits the application port. Optional.
        port: 9999
        # Path to use for the health check. If not specified defaults to
        # "/". Optional.
        path: "/healthz"

Notes:

  • A health check must report healthy for you to access the application.
  • If you specify both the HTTP and Exec health checks, Coder prioritizes HTTP.

You can include the applications specification file in your workspace image. You an also modify the file via personalization scripts.

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