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Kamaji etcd

A set of tools to deploy and operate a multi-tenant etcd datastore for Kamaji control-plane.

Background

Kamaji turns any Kubernetes cluster into a Management Cluster to orchestrate other Kubernetes clusters called Tenant Clusters. The Control Plane of a tenant cluster is made of regular pods running in a namespace of the Management Cluster instead of a dedicated set of Virtual Machines. This solution makes running control planes at scale cheaper and easier to deploy and operate.

As of any Kubernetes cluster, a Tenant Cluster needs a datastore where to save the state and be able to retrieve data. Kamaji provides multiple options: a multi-tenant etcd as well as MySQL, and PostgreSQL, thanks to the kine integration.

A multi-tenant deployment for etcd is not common practice. However, etcd provides simple and robust APIs for creating users and setting up role based access control (RBAC) policies to define which user have access to what key prefix. However, in Kamaji, you can use multiple kamaji-etcd for different tenants. The relationship between tenant clusters and datastore can be many-to-one, one-to-one, depending on the preferencess and use cases.

Documentation

Refer to the etcd documentation. Following sections provide additional procedures to help with a specific setup as it is used into project Kamaji.

Roadmap

  • Install High Available etcd cluster as StatefulSet
  • Provide data persistence through Persistent Volumes
  • Multi-tenancy
  • Autocompaction
  • Scheduled defragmentation
  • Auto generate certificates
  • Scheduled snapshots
  • Metrics Service Monitors
  • Alert rules
  • Grafana dashboard
  • Benchmarking

Getting started

To install the multi-tenant kamaji-etcd on the Kamaji Management Cluster using the provided Helm Chart, run the following commands:

helm repo add clastix https://clastix.github.io/charts
helm repo update
helm install kamaji-etcd clastix/kamaji-etcd -n kamaji-etcd --create-namespace

The etcd certificates are stored as secrets into the same namespace:

  • <release_name>-certs contains CA, peers, and server certificates
  • <release_name>-root-client-certs contains the user root certificates

Ensure the Kamaji controller has access to these secrets.