kubernetes core #1069

Supports: bionic
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Description

A minimal two-machine Kubernetes cluster, appropriate for development.

Kubernetes Core Bundle

Overview

This is a minimal Kubernetes cluster composed of the following components and features:

  • Kubernetes (automated deployment, operations, and scaling)
    • Kubernetes cluster with one master and one worker node.
    • TLS used for communication between nodes for security.
    • A CNI plugin (Flannel)
    • Optional Ingress Controller (on worker)
    • Optional Dashboard addon (on master) including Heapster for cluster monitoring
  • EasyRSA
    • Performs the role of a certificate authority serving self signed certificates
      to the requesting units of the cluster.
  • Etcd (distributed key value store)
    • One node for basic functionality.

This bundle is suitable for development and testing purposes. For a more robust, scaled-out cluster, deploy the
charmed-kubernetes bundle.

For detailed installation and usage, please see the Charmed Kubernetes documentation.

Flannel

Flannel is a virtual network that gives a subnet to each host for use with
container runtimes.

Configuration

iface The interface to configure the flannel SDN binding. If this value is
empty string or undefined the code will attempt to find the default network
adapter similar to the following command:

route | grep default | head -n 1 | awk {'print $8'}

cidr The network range to configure the flannel SDN to declare when
establishing networking setup with etcd. Ensure this network range is not active
on the vlan you're deploying to, as it will cause collisions and odd behavior
if care is not taken when selecting a good CIDR range to assign to flannel.

Known Limitations

This subordinate does not support being co-located with other deployments of
the flannel subordinate (to gain 2 vlans on a single application). If you
require this support please file a bug.

This subordinate also leverages juju-resources, so it is currently only available
on juju 2.0+ controllers.

Further information

Bundle configuration

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