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.. This work is licensed under a Creative Commons Attribution 4.0 International License.
.. http://creativecommons.org/licenses/by/4.0
.. SPDX-License-Identifier CC-BY-4.0
.. (c) Authors of Clover
.. _controller_services_config_guide:
==============================================
Clover Controller Services Configuration Guide
==============================================
This document provides a guide to use the Clover controller services, which are introduced in
the Clover Gambia release.
Overview
=========
Clover controller services allow users to control and access information about Clover
microservices. Two new components are added to Clover to facilitate an ephemeral, cloud native
workflow. A CLI interface with the name **cloverctl** interfaces to the Kubernetes (k8s)
API and also to **clover-controller**, a microservice deployed within the k8s cluster to
instrument other Clover k8s services including sample network services, visibility/validation
services and supporting datastores (redis, cassandra). The **clover-controller** service
provides message routing communicating REST with cloverctl or other API/UI interfaces and
gRPC to internal k8s cluster microservices. It acts as an internal agent and reduces the need
to expose multiple Clover services outside of a k8s cluster.
The **clover-controller** is packaged as a docker container with manifests to deploy
in a Kubernetes (k8s) cluster. The **cloverctl** CLI is packaged as a binary (Golang) within a
tarball with associated yaml files that can be used to configure and control other Clover
microservices within the k8s cluster via **clover-controller**. The **cloverctl** CLI can also
deploy/delete other Clover services within the k8s cluster for convenience.
The **clover-controller** service provides the following functions:
* **REST API:** interface allows CI scripts/automation to control sample network sample services,
visibility and validation services. Analyzed visibility data can be consumed by other
services with REST messaging.
* **CLI Endpoint:** acts as an endpoint for many **cloverctl** CLI commands using the
**clover-controller** REST API and relays messages to other services via gRPC.
* **UI Dashboard:** provides a web interface exposing visibility views to interact with
Clover visibility services. It presents analyzed visibility data and provides basic controls
such as selecting which user services visibility will track.
The **cloverctl** CLI command syntax is similar to k8s kubectl or istio istioctl CLI tools, using
a <verb> <noun> convention.
Help can be accessed using the ``--help`` option, as shown below::
$ cloverctl --help
Deploying Clover system services
================================
Prerequisites
-------------
The following assumptions must be met before continuing on to deployment:
* Installation of Docker has already been performed. It's preferable to install Docker CE.
* Installation of k8s in a single-node or multi-node cluster.
.. _controller_services_cli:
Download Clover CLI
-------------------
Download the cloverctl binary from the location below::
$ curl -L https://github.com/opnfv/clover/raw/stable/gambia/download/cloverctl.tar.gz | tar xz
$ cd cloverctl
$ export PATH=$PWD:$PATH
To begin deploying Clover services, ensure the correct k8s context is enabled. Validate that
the CLI can interact with the k8s API with the command::
$ cloverctl get services
The command above must return a listing of the current k8s services similar to the output of
'kubectl get svc --all-namespaces'.
.. _controller_services_controller:
Deploying clover-controller
---------------------------
To deploy the **clover-controller** service, use the command below:
.. code-block:: bash
$ cloverctl create system controller
The k8s pod listing below must include the **clover-controller** pod in the **clover-system**
namespace:
.. code-block:: bash
$ kubectl get pods --all-namespaces | grep clover-controller
NAMESPACE NAME READY STATUS
clover-system clover-controller-74d8596bb5-jczqz 1/1 Running
.. _exposing_clover_controller:
Exposing clover-controller
==========================
To expose the **clover-controller** deployment outside of the k8s cluster, a k8s NodePort
or LoadBalancer service must be employed.
Using NodePort
--------------
To use a NodePort for the **clover-controller** service, use the following command::
$ cloverctl create system controller nodeport
The NodePort default is to use port 32044. To modify this, edit the yaml relative
to the **cloverctl** path at ``yaml/controller/service_nodeport.yaml`` before invoking
the command above. Delete the ``nodePort:`` key in the yaml to let k8s select an
available port within the the range 30000-32767.
Using LoadBalancer
------------------
For k8s clusters that support a LoadBalancer service, such as GKE, one can be created for
**clover-controller** with the following command::
$ cloverctl create system controller lb
Setup with cloverctl CLI
------------------------
The **cloverctl** CLI will communicate with **clover-controller** on the service exposed above
and requires the IP address of either the load balancer or a cluster node IP address, if a
NodePort service is used. For a LoadBalancer service, **cloverctl** will automatically find
the IP address to use and no further action is required.
However, if a NodePort service is used, an additional step is required to configure the IP
address for **cloverctl** to target. This may be the CNI (ex. flannel/weave) IP address or the IP
address of an k8s node interface. The **cloverctl** CLI will automatically determine the
NodePort port number configured. To configure the IP address, create a file named
``.cloverctl.yaml`` and add a single line to the yaml file with the following::
ControllerIP: <IP addresss>
This file must be located in your ``HOME`` directory or in the same directory as the **cloverctl**
binary.
Uninstall from Kubernetes environment
=====================================
Delete with Clover CLI
-----------------------
When you're finished working with Clover system services, you can uninstall it with the
following command:
.. code-block:: bash
$ cloverctl delete system controller
$ cloverctl delete system controller nodeport # for NodePort
$ cloverctl delete system controller lb # for LoadBalancer
The commands above will remove the clover-controller deployment and service resources
created from the current k8s context.
Uninstall from Docker environment
=================================
The OPNFV docker image for the **clover-controller** can be removed with the following commands
from nodes in the k8s cluster.
.. code-block:: bash
$ docker rmi opnfv/clover-controller
|
