kubernetes worker ^#0

By cmars
stable

Supports: xenial

Description

Kubernetes is an open-source platform for deplying, scaling, and operations of appliation containers across a cluster of hosts. Kubernetes is portable in that it works with public, private, and hybrid clouds. Extensible through a pluggable infrastructure. Self healing in that it will automatically restart and place containers on healthy nodes if a node ever goes away.

Kubernetes Worker

Usage

This charm deploys a container runtime, and additionally stands up the Kubernetes worker applications: kubelet, and kube-proxy.

In order for this charm to be useful, it should be deployed with its companion charm kubernetes-master and linked with an SDN-Plugin.

This charm has also been bundled up for your convenience so you can skip the above steps, and deploy it with a single command:

juju deploy canonical-kubernetes

For more information about Canonical Kubernetes consult the bundle README.md file.

Scale out

To add additional compute capacity to your Kubernetes workers, you may juju add-unit scale the cluster of applications. They will automatically join any related kubernetes-master, and enlist themselves as ready once the deployment is complete.

Operational actions

The kubernetes-worker charm supports the following Operational Actions:

Pause

Pausing the workload enables administrators to both drain and cordon a unit for maintenance.

Resume

Resuming the workload will uncordon a paused unit. Workloads will automatically migrate unless otherwise directed via their application declaration.

Known Limitations

Kubernetes workers currently only support 'phaux' HA scenarios. Even when configured with an HA cluster string, they will only ever contact the first unit in the cluster map. To enalbe a proper HA story, kubernetes-worker units are encouraged to proxy through a kubeapi-load-balancer application. This enables a HA deployment without the need to re-render configuration and disrupt the worker services.

External access to pods must be performed through a Kubernetes Ingress Resource. More information

Configuration

enable-cgroups: (boolean) Enable GRUB cgroup overrides cgroup_enable=memory swapaccount=1. WARNING changing this option will reboot the host - use with caution on production services
http_proxy: (string) URL to use for HTTP_PROXY to be used by Docker. Only useful in closed environments where a proxy is the only option for routing to the registry to pull images
https_proxy: (string) URL to use for HTTPS_PROXY to be used by Docker. Only useful in closed environments where a proxy is the only option for routing to the registry to pull images
ingress: (boolean) Deploy the default http backend and ingress controller to handle ingress requests.; True
install_from_upstream: (boolean) Toggle installation from ubuntu archive vs the docker PPA