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Service Settings Configuration

Document updated on Oct 24, 2023

We call service settings (or the service layer) those parameters that allow you to change how KrakenD behaves globally (and not to a specific call). They determine how you start the HTTP server, enforce security parameters, or define behavioral options like which reporting activities occur, to name a few examples.

Examples of service settings are, the listening port, disabling keep alives, enabling metrics and traces, listening https, or enabling CORS to name a few.

If you haven’t done it yet, read Understanding the configuration file.

All service settings are written directly in the root of the configuration file or its corresponding extra_config. So, for instance, here there is a configuration file describing a service listening on port 8080 with extended logging enabled:

{
    "version": 3,
    "port": 8080,
    "listen_ip": "192.168.1.3",
    "endpoints": [],
    "extra_config": {
      "telemetry/logging": {
        "level": "WARNING",
        "syslog": true,
        "stdout": true
      }
    }
}

The service accepts numerous configuration options that you’ll find explained through the rest of the documentation, but here is a preview of the most important ones:

Fields of
* required fields
endpoints

array
Your API contract, or the list of all paths recognized by this gateway. The paths /__health/, /__debug/, /__echo/, /__catchall, and /__stats/ are reserved by the system and you cannot declare them. Their existence depends on their respective settings.
extra_config

object
The optional configuration that extends the core functionality of the gateway is specified here. The extra_config at this level enables service components, meaning that they apply globally to all endpoints or activity.
listen_ip

string
The IP address that KrakenD listens to in IPv4 or IPv6. An empty string, or no declaration at all means listening on all interfaces. The inclusion of :: is meant for IPv6 format only (this is not the port). Examples of valid addresses are 192.0.2.1 (IPv4), 2001:db8::68 (IPv6). The values :: and 0.0.0.0 listen to all addresses and both are valid for IPv4 and IPv6 simultaneously.
Example: "172.12.1.1" , "::1"
Defaults to "0.0.0.0"
port

integer
The TCP port where KrakenD is listening to. Recommended value is in the range 1024-65535 to run as an unpriviliged user
Defaults to 8080
version  *

integer
The syntax version tells KrakenD how to read this configuration. This is not the KrakenD version. Each KrakenD version is linked to a syntax version, and since KrakenD v2.0 the version must be 3
Possible values are: 3

Other service-level settings you can add:

Scarf

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