Kairos Microk8s Cluster Plugin

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This provider will configure a Microk8s installation based on the cluster section of cloud init.

Configuration

cluster_token: a token all members of the cluster must have to join the cluster.

control_plane_host: the host of the cluster control plane. This is used to join nodes to a cluster. If this is a single node cluster this is not required.

role: defines what operations is this device responsible for. The roles are described in detail below.

• init This role denotes a device that should initialize the dqlite cluster and operate as a Microk8s control plane. There should only be one device with this role per cluster.
• controlplane: runs the Microk8s control plane.
• worker: runs the Microk8s worker.

config: User provided configuration for microk8s. It supports the following configuration entries

• clusterConfiguration: Defense cluster level parameters

     # Changes the default cluster agent port and the dqlite ports to use 30000 and 6443 which might be more likely to be open in firewalls
     `portCompatibilityRemap` : true
     
     # Writes the kubeconfig to a specified location
     `writeKubeconfig`: "/run/kubeconfig" 
     
     # Switch dqlite to use the internal IP of the Node instead of the 127.0.0.1 
     `dqliteUseHostIPV4Address`: true
     
     # Uses the  DNS server entries from the host for the coredns configuration(reads from /etc/resolv.conf)
     `useHostDNS`: true
     
     # Specifies custom DNs server. Overrides the previous setting
     `DNS` : 75.75.74.74
     # Customize calico settings
     `calico`: 
        # Enable IpinIP
        `calicoIPinIP`: true
        # Change the calico IP_AUTODETECTION_METHOD env . By default When forming a MicroK8s cluster, Calico is updated to use address that was used in the microk8s join command (IP_AUTODETECTION_METHOD=can-reach=10.10.10.10)
        `calicoAutoDetect`: "cidr=10.10.128.0/18"  
  

• initConfiguration: Configuration only for the init node

    addons:
       - dns
  

Example

#cloud-config

cluster:
  cluster_token: randomstring
  control_plane_host: cluster.example.com
  role: init
  config: |
    clusterConfiguration:
          # Changes the default cluster agent port 
          portCompatibilityRemap : true
          writeKubeconfig: "/run/kubeconfig"
          dqliteUseHostIPV4Address: true
          useHostDNS: true
          calico: 
             calicoIPinIP: true
             calicoAutoDetect: "cidr=10.10.128.0/18"
    initConfiguration:
                  addons:
                    - dns