Components overview¶
Mirantis OpenStack for Kubernetes (MOSK) includes the following key design elements.
HelmBundle Operator¶
The HelmBundle Operator is the realization of the Kubernetes Operator
pattern that provides a Kubernetes custom resource of the HelmBundle
kind and code running inside a pod in Kubernetes. This code handles changes,
such as creation, update, and deletion, in the Kubernetes resources of this
kind by deploying, updating, and deleting groups of Helm releases from
specified Helm charts with specified values.
OpenStack¶
The OpenStack platform manages virtual infrastructure resources, including virtual servers, storage devices, networks, and networking services, such as load balancers, as well as provides management functions to the tenant users.
Various OpenStack services are running as pods in Kubernetes and are
represented as appropriate native Kubernetes resources, such as
Deployments, StatefulSets, and DaemonSets.
For a simple, resilient, and flexible deployment of OpenStack and related services on top of a Kubernetes cluster, MOSK uses OpenStack-Helm that provides a required collection of the Helm charts.
Also, MOSK uses OpenStack Operator as the realization
of the Kubernetes Operator pattern. The OpenStack Operator provides a custom
Kubernetes resource of the OpenStackDeployment kind and code running
inside a pod in Kubernetes. This code handles changes such as creation,
update, and deletion in the Kubernetes resources of this kind by
deploying, updating, and deleting groups of the Helm releases.
Ceph¶
Ceph is a distributed storage platform that provides storage resources, such as objects and virtual block devices, to virtual and physical infrastructure.
MOSK uses Rook as the implementation of the
Kubernetes Operator pattern that manages resources of the CephCluster
kind to deploy and
manage Ceph services as pods on top of Kubernetes to provide Ceph-based
storage to the consumers, which include OpenStack services, such as Volume
and Image services, and underlying Kubernetes through Ceph CSI (Container
Storage Interface).
The Ceph Controller is the implementation of the Kubernetes Operator
pattern, that manages resources of the MiraCeph kind to simplify
management of the Rook-based Ceph clusters.
StackLight Logging, Monitoring, and Alerting¶
The StackLight component is responsible for collection, analysis, and visualization of critical monitoring data from physical and virtual infrastructure, as well as alerting and error notifications through a configured communication system, such as email. StackLight includes the following key sub-components:
Prometheus
OpenSearch
OpenSearch Dashboards
Fluentd