Configuration

You configure the control plane, data plane, and CLI (kumactl) for Kuma separately. Here's what to do.

Control plane

You can configure the control plane:

• With environment variables
• With a YAML configuration file

Environment variables take precedence over a YAML configuration file.

The Kuma package includes a reference configuration, at conf/kuma-cp.conf.yml.

If you install the control plane with kumactl, you can override the configuration with the --env-var flag. For example, to configure the refresh interval for configuration of the data plane proxy, specify:

kumactl install control-plane \
  --env-var KUMA_XDS_SERVER_DATAPLANE_CONFIGURATION_REFRESH_INTERVAL=5s \
  --env-var KUMA_XDS_SERVER_DATAPLANE_STATUS_FLUSH_INTERVAL=5s | kubactl apply -f -

If you install the control plane with HELM, you can override the configuration with the envVars field. For example, to configure the refresh interval for configuration with the data plane proxy, specify:

helm install --version 0.7.1 \
  --set controlPlane.envVars.KUMA_XDS_SERVER_DATAPLANE_CONFIGURATION_REFRESH_INTERVAL=5s \
  --set controlPlane.envVars.KUMA_XDS_SERVER_DATAPLANE_STATUS_FLUSH_INTERVAL=5s \
  kuma kuma/kuma

Or you can create a values.yaml file with:

controlPlane:
  envVars:
    KUMA_XDS_SERVER_DATAPLANE_CONFIGURATION_REFRESH_INTERVAL: 5s
    KUMA_XDS_SERVER_DATAPLANE_STATUS_FLUSH_INTERVAL: 5s

and then specify it in the helm install command:

helm install --version 0.7.1 -f values.yaml kuma kuma/kuma

First, specify your overrides in the appropriate config file, then run kuma-cp:

For example create a kuma-cp.conf.overrides.yml file with:

xdsServer:
  dataplaneConfigurationRefreshInterval: 5s
  dataplaneStatusFlushInterval: 5s

Use this configuration file in the arguments:

kuma-cp run -c kuma-cp.conf.overrides.yml

Or you can specify environment variables:

KUMA_XDS_SERVER_DATAPLANE_CONFIGURATION_REFRESH_INTERVAL=5s \
  KUMA_XDS_SERVER_DATAPLANE_STATUS_FLUSH_INTERVAL=5s \
  kuma-cp run

If you configure kuma-cp with a YAML file, make sure to provide only values that you want to override. Otherwise, upgrading Kuma might be harder, because you need to keep track of your changes when replacing this file on every upgrade.

Inspecting the configuration

Configuration of kuma-cp is logged when kuma-cp runs.

You can also get the configuration with a call to the Kuma API server:

curl http://<CP_ADDRESS>:5681/config

And it's displayed on the Diagnostic tab in the GUI, in the lower left corner.

In a multizone deployment, the zone control plane sends its config to the global control plane. This lets you inspect all configurations with kumactl inspect zones -oyaml. You can also find them on the Zone tab in the GUI.

Data plane proxy

In Kubernetes, kuma-dp is automatically configured and injected by Kubernetes. The data plane proxy configuration is determined by the control plane. You can review the config details in the runtime.kubernetes.injector.sidecarContainer section of the kuma-cp config.

kuma-dp is configured with command line arguments. Run kuma-dp run -h to inspect all available settings.

Inspecting the configuration

Configuration of kuma-dp is logged when kuma-dp runs.

kumactl

The configuration is stored in $HOME/.kumactl/config, which is created when you run kumactl for the first time. When you add a new control plane with kumactl config control-planes add, the config file is updated. To change the path of the config file, run kumactl with --config-file /new-path/config.

Inspecting the configuration

You can view the current configuration using kumactl config view.