In addition to the components strictly required to create a Kubernetes cluster, Charmed Kubernetes installs and configures some components for convenience and/or to add support for specific features.
This page details these components, their purpose and how they may be enabled/disabled where applicable.
Sourced from: https://github.com/ceph/ceph-csi.git
The CephCSI addon provides a Container Storage Interface enabling Kubernetes to dynamically allocate storage to workloads from a Ceph cluster.
The Storage documentation details how to set up and use Ceph for storage with Charmed Kubernetes.
Sourced from: https://github.com/coredns/deployment.git
CoreDNS has been the default DNS provider for Charmed Kubernetes clusters since 1.14.
It is possible to use
kube-dns as the DNS provider, or turn off DNS
altogether by adjusting the kubernetes-master configuration.
Sourced from: https://github.com/kubernetes/dashboard.git
The Kubernetes Dashboard is a standard and easy way to inspect and interact with your Kubernetes cluster.
For instructions on how to access the dashboard, please see the Operations page.
If desired, the dashboard can be disabled:
juju config kubernetes-master enable-dashboard-addons=false
...and re-enabled with:
juju config kubernetes-master enable-dashboard-addons=true
Sourced from: https://github.com/NVIDIA/k8s-device-plugin.git
This plugin enables GPU support for nodes when running with the appropriate resources. The plugin is set to 'auto' by default, so it only runs when the drivers and GPU resources are available on the host system.
If you wish to disable the plugin entirely, it can be turned off by setting the
juju config kubernetes-master enable-nvidia-plugin="false"
The default setting is "auto", and it is also possible to set the configuration to "true", which will load the plugin regardless of whether the resources were found, which may be useful for troubleshooting.
There is more information on using GPUs for workloads, and working with public cloud GPU instances, on the GPU workers page.
This addon provides the components required to enable Charmed Kubernetes to work with LDAP/Keystone for Authentication and Authorisation.
Please refer to the LDAP and Keystone page for more information on using this feature.
Sourced from: https://github.com/kubernetes/kube-state-metrics.git
Since version 1.17, kube-state-metrics have been enabled by default in Charmed Kubernetes
kube-state-metrics plugin can be disabled with:
juju config kubernetes-master enable-metrics=false
...and re-enabled with:
juju config kubernetes-master enable-metrics=true
There is more information on accessing the metrics and integrating them into a Prometheus/Grafana/Telegraf stack in the monitoring docs.