Tungsten Fabric cluster components

This section describes the Tungsten Fabric services and their distribution across the Mirantis OpenStack for Kubernetes (MOSK) deployment.

The Tungsten Fabric services run mostly as DaemonSets in separate containers for each service. The deployment and update processes are managed by the Tungsten Fabric Operator. However, Kubernetes manages the probe checks and restart of broken containers.

Configuration and control services

All configuration and control services run on the Tungsten Fabric Controller nodes.

Service name

Service description

config-api

Exposes a REST-based interface for the Tungsten Fabric API.

config-nodemgr

Collects data of the Tungsten Fabric configuration processes and sends it to the Tungsten Fabric collector.

control

Communicates with the cluster gateways using BGP and with the vRouter agents using XMPP, as well as redistributes appropriate networking information.

control-nodemgr

Collects the Tungsten Fabric Controller process data and sends this information to the Tungsten Fabric collector.

device-manager

Manages physical networking devices using netconf or ovsdb. In multi-node deployments, it operates in the active-backup mode.

dns

Using the named service, provides the DNS service to the VMs spawned on different compute nodes. Each vRouter node connects to two Tungsten Fabric Controller containers that run the dns process.

named

The customized Berkeley Internet Name Domain (BIND) daemon of Tungsten Fabric that manages DNS zones for the dns service.

schema

Listens to configuration changes performed by a user and generates corresponding system configuration objects. In multi-node deployments, it works in the active-backup mode.

svc-monitor

Listens to configuration changes of service-template and service-instance, as well as spawns and monitors virtual machines for the firewall, analyzer services, and so on. In multi-node deployments, it works in the active-backup mode.

webui

Consists of the webserver and jobserver services. Provides the Tungsten Fabric web UI.

Analytics services

All analytics services run on Tungsten Fabric analytics nodes.

Service name

Service description

alarm-gen

Evaluates and manages the alarms rules.

analytics-api

Provides a REST API to interact with the Cassandra analytics database.

analytics-nodemgr

Collects all Tungsten Fabric analytics process data and sends this information to the Tungsten Fabric collector.

analytics-database-nodemgr

Provisions the init model if needed. Collects data of the database process and sends it to the Tungsten Fabric collector.

collector

Collects and analyzes data from all Tungsten Fabric services.

query-engine

Handles the queries to access data from the Cassandra database.

snmp-collector

Receives the authorization and configuration of the physical routers from the config-nodemgr service, polls the physical routers using the Simple Network Management Protocol (SNMP), and uploads the data to the Tungsten Fabric collector.

topology

Reads the SNMP information from the physical router user-visible entities (UVEs), creates a neighbor list, and writes the neighbor information to the physical router UVEs. The Tungsten Fabric web UI uses the neighbor list to display the physical topology.

vRouter

The Tungsten Fabric vRouter provides data forwarding to an OpenStack tenant instance and reports statistics to the Tungsten Fabric analytics service. The Tungsten Fabric vRouter is installed on all OpenStack compute nodes. Mirantis OpenStack for Kubernetes (MOSK) supports the kernel-based deployment of the Tungsten Fabric vRouter.

vRouter services on the OpenStack compute nodes

Service name

Service description

vrouter-agent

Connects to the Tungsten Fabric Controller container and the Tungsten Fabric DNS system using the Extensible Messaging and Presence Protocol (XMPP). The vRouter Agent acts as a local control plane. Each Tungsten Fabric vRouter Agent is connected to at least two Tungsten Fabric controllers in an active-active redundancy mode.

The Tungsten Fabric vRouter Agent is responsible for all networking-related functions including routing instances, routes, and others.

The Tungsten Fabric vRouter uses different gateways for the control and data planes. For example, the Linux system gateway is located on the management network, and the Tungsten Fabric gateway is located on the data plane network.

vrouter-nodemgr

Collects the supervisor vrouter data and sends it to the Tungsten Fabric collector.

The following diagram illustrates the Tungsten Fabric kernel vRouter set up by the TF operator:

../../../_images/tf_vrouter.png

On the diagram above, the following types of networks interfaces are used:

  • eth0 - for the management (PXE) network (eth1 and eth2 are the slave interfaces of Bond0)

  • Bond0.x - for the MKE control plane network

  • Bond0.y - for the MKE data plane network

Third-party services

Service name

Service description

cassandra

  • On the Tungsten Fabric control plane nodes, maintains the configuration data of the Tungsten Fabric cluster.

  • On the Tungsten Fabric analytics nodes, stores the collector service data.

cassandra-operator

The Kubernetes operator that enables the Cassandra clusters creation and management.

kafka

Handles the messaging bus and generates alarms across the Tungsten Fabric analytics containers.

kafka-operator

The Kubernetes operator that enables Kafka clusters creation and management.

redis

Stores the physical router UVE storage and serves as a messaging bus for event notifications.

redis-operator

The Kubernetes operator that enables Redis clusters creation and management.

zookeeper

Holds the active-backup status for the device-manager, svc-monitor, and the schema-transformer services. This service is also used for mapping of the Tungsten Fabric resources names to UUIDs.

zookeeper-operator

The Kubernetes operator that enables ZooKeeper clusters creation and management.

rabbitmq

Exchanges messages between API servers and original request senders.

rabbitmq-operator

The Kubernetes operator that enables RabbitMQ clusters creation and management.

Plugin services

All Tungsten Fabric plugin services are installed on the OpenStack controller nodes.

Service name

Service description

neutron-server

The Neutron server that includes the Tungsten Fabric plugin.

octavia-api

The Octavia API that includes the Tungsten Fabric Octavia driver.

heat-api

The Heat API that includes the Tungsten Fabric Heat resources and templates.

Image precaching DaemonSets

Available since MOSK 22.3

Along with the Tungsten Fabric services, MOSK deploys and updates special image precaching DaemonSets when the kind TFOperator resource is created or image references in it get updated. These DaemonSets precache container images on Kubernetes nodes minimizing possible downtime when updating container images. Cloud operator can disable image precaching through the TFOperator resource.