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Configuration 🔗︎

This guide covers how to configure KIND cluster creation.

We know this is currently a bit lacking right now and will expand it over time - PRs welcome!

Getting Started 🔗︎

To configure kind cluster creation, you will need to create a [YAML] config file. This file follows Kubernetes conventions for versioning etc.

A minimal valid config is:

kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4

This config merely specifies that we are configuration a KIND cluster (kind: Cluster) and that the version of KIND's config we are using is v1alpha4 (apiVersion: kind.x-k8s.io/v1alpha4).

Any given version of kind may support different versions which will have different options and behavior. This is why we must always specify the version.

This mechanism is inspired by Kubernetes resources and component config.

To use this config, place the contents in a file config.yaml and then run kind create cluster --config=config.yaml from the same directory.

You can also include a full file path like kind create cluster --config=/foo/bar/config.yaml.

Cluster-Wide Options 🔗︎

The following high level options are available.

NOTE: not all options are documented yet! We will fix this with time, PRs welcome!

Networking 🔗︎

Multiple details of the cluster's networking can be customized under the networking field.

IP Family 🔗︎

KIND has limited support for IPv6 (and soon dual-stack!) clusters, you can switch from the default of IPv4 by setting:

kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
networking:
  ipFamily: ipv6

NOTE: you may need to reconfigure your docker daemon to enable ipv6 in order to use this.

IPv6 does not work on docker for mac because port forwarding ipv6 is not yet supported in docker for mac.

API Server 🔗︎

The API Server listen address and port can be customized with:

kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
networking:
  # WARNING: It is _strongly_ recommended that you keep this the default
  # (127.0.0.1) for security reasons. However it is possible to change this.
  apiServerAddress: "127.0.0.1"
  # By default the API server listens on a random open port.
  # You may choose a specific port but probably don't need to in most cases.
  # Using a random port makes it easier to spin up multiple clusters.
  apiServerPort: 6443

Pod Subnet 🔗︎

You can configure the subnet used for pod IPs by setting

kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
networking:
  podSubnet: "10.244.0.0/16"

Service Subnet 🔗︎

You can configure the Kubernetes service subnet used for service IPs by setting

kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
networking:
  serviceSubnet: "10.96.0.0/12"

Disable Default CNI 🔗︎

KIND ships with a simple networking implementation (“kindnetd”) based around standard CNI plugins (ptp, host-local, …) and simple netlink routes.

This CNI also handles IP masquerade.

You may disable the default to install a different CNI. This is a power user feature with limited support, but many common CNI manifests are known to work, e.g. Calico.

kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
networking:
  # the default CNI will not be installed
  disableDefaultCNI: true

Nodes 🔗︎

The kind: Cluster object has a nodes field containing a list of node objects. If unset this defaults to:

nodes:
# one node hosting a control plane
- role: control-plane

You can create a multi node cluster with the following config:

kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
# One control plane node and three "workers".
#
# While these will not add more real compute capacity and
# have limited isolation, this can be useful for testing
# rolling updates etc.
#
# The API-server and other control plane components will be
# on the control-plane node.
#
# You probably don't need this unless you are testing Kubernetes itself.
nodes:
- role: control-plane
- role: worker
- role: worker
- role: worker

Per-Node Options 🔗︎

The following options are available for setting on each entry in nodes.

NOTE: not all options are documented yet! We will fix this with time, PRs welcome!

Extra Mounts 🔗︎

Extra mounts can be used to pass through storage on the host to a kind node for persisting data, mounting through code etc.

examples/config-with-mounts.yaml
kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
nodes:
- role: control-plane
  # add a mount from /path/to/my/files on the host to /files on the node
  extraMounts:
  - hostPath: /path/to/my/files/
    containerPath: /files

Extra Port Mappings 🔗︎

Extra port mappings can be used to port forward to the kind nodes. This is a cross-platform option to get traffic into your kind cluster.

With docker on Linux you can simply send traffic to the node IPs from the host without this, but to cover macOS and Windows you'll want to use these.

You may also want to see the Ingress Guide.

examples/config-with-port-mapping.yaml
kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
nodes:
- role: control-plane
  # port forward 80 on the host to 80 on this node
  extraPortMappings:
  - containerPort: 80
    hostPort: 80
    # optional: set the bind address on the host
    # 0.0.0.0 is the current default
    listenAddress: "127.0.0.0"
    # optional: set the protocol to one of TCP, UDP, SCTP.
    # TCP is the default
    protocol: TCP