Extending HPA for K8S

Work in Progress - 9/9/2020

Kubernetes clusters using ONAP Multicloud K8s Plugin Project for R4/R5 do not report hardware features to A&AI. Consequently during the CNF/VNF life cycle CNFs/VNFs that require or recommend specific hardware during instantiation cannot dynamically reach the correct cluster and node that provides the needed hardware capabilities.

This epic ( MULTICLOUD-729 - Getting issue details... STATUS ) adds the ability to discover, report and use hardware features during CNF/VNF life cycle to accelerate use cases using ONAP.

Flow Diagram for HPA for K8s

Discovery and Labeling of Node Features

Discovery of HPA features will be done using the node feature discovery [NFD] addon (https://github.com/kubernetes-sigs/node-feature-discovery) for kubernetes. NFD will be deployed as a daemonSet, with pods on each node and will discover and label hardware features on each kubernetes node with features labels (https://github.com/kubernetes-sigs/node-feature-discovery#feature-labels).

Registering of K8s Clusters

Registration of K8s Cluster will happen at the ESR UI. ESR will then send a POST request to

http://{{MSB_IP}}:{{MSB_PORT}}/api/multicloud-k8s/v1/{{cloud-owner}}/{{cloud-region-id}}/registry

Multicloud K8s Plugin registrationHandler will receive said POST and register the new Kubernetes cluster with the K8s Plugin using the connectivity code/API.

ESR Update?

We need to check what is sent from ESR to registery URL. Currently the K8s Plugin uses a kubeconfig file to access different k8s clusters. We will either need to generate a kubeconfig file (does ESR send enough info to do this? If not we might need to extend ESR) or access the cluster using another form of authentication (check k8s code and see if this is possible - auth token perhaps?

The registrationHandler will then query the k8s cluster under registration to get a list of nodes and the labels for each node.

Reporting of Cluster Info to AA&I

Reporting of HPA features to AA&I is done by the registrationHandler. Data will be munged to cloud-region/tenant/flavors schema for that cluster and reported to AA&I. registrationHandler is planning on using AA&I module under development for Frankfurt to report to AA&I. In this case we will send a request to the AA&I module instructing it to update the cloud-region, create a tenant and create flavors that match the node feature labels in said cloud-region.

Update of CNF Artifacts to Include nodeSelector

CNF and VNF helm charts will be updated with nodeSelector requirements & recommendations in line with node labels created by NFD during feature discovery.
Example Node Features:

# Hardware Feature Labels:
feature.node.kubernetes.io/cpu-cpuid.AESNI=true,
feature.node.kubernetes.io/cpu-cpuid.AVX2=true,
feature.node.kubernetes.io/cpu-cpuid.AVX=true,
feature.node.kubernetes.io/cpu-cpuid.FMA3=true,
feature.node.kubernetes.io/cpu-cpuid.IBPB=true,
feature.node.kubernetes.io/cpu-cpuid.STIBP=true,
feature.node.kubernetes.io/cpu-hardware_multithreading=true,
feature.node.kubernetes.io/cpu-pstate.turbo=true,
feature.node.kubernetes.io/cpu-rdt.RDTCMT=true,
feature.node.kubernetes.io/cpu-rdt.RDTMON=true,
feature.node.kubernetes.io/memory-numa=true,
feature.node.kubernetes.io/network-sriov.capable=true,
feature.node.kubernetes.io/pci-0300_102b.present=true,
feature.node.kubernetes.io/storage-nonrotationaldisk=true

# Software Feature Labels:
feature.node.kubernetes.io/kernel-config.NO_HZ=true,
feature.node.kubernetes.io/kernel-config.NO_HZ_FULL=true,
feature.node.kubernetes.io/kernel-version.full=3.10.0-957.el7.x86_64,
feature.node.kubernetes.io/kernel-version.major=3,
feature.node.kubernetes.io/kernel-version.minor=10,
feature.node.kubernetes.io/kernel-version.revision=0,
feature.node.kubernetes.io/system-os_release.ID=centos,
feature.node.kubernetes.io/system-os_release.VERSION_ID.major=7,
feature.node.kubernetes.io/system-os_release.VERSION_ID.minor=,
feature.node.kubernetes.io/system-os_release.VERSION_ID=7

Instantiation of K8s HPA

See Deploying vFw and EdgeXFoundry Services on Kubernets Cluster with ONAP for instantiation flow for K8s. See https://docs.onap.org/en/latest/submodules/integration.git/docs/docs_vfwHPA.html?highlight=hpa VFW deployment with HPA for HPA use case.

If we follow the deploying vFW for K8s on ONAP, the only difference in the process for HPA would be the addition of homing (see VFW deployment with HPA docs above) to the SO instantiation request. This enables a call to OOF that uses AA&I and Policy to select the correct cluster.

Policy and OOF will use the same path to discover capabilities of K8s nodes as are done for OpenStack. We are using the same data model (OpenStack cloud-region/tenant/flavors) from AA&I. OOF will use AA&I information to home particular CNF workloads to cloud-regions which contain requested features. When K8s plugin instantiates said workloads Kubernetes will read nodeSelector preferences and place each workload on nodes which contain needed features to accelerate their function.

High Level Task Overview

Ensure NFD (Node feature discovery - K8S CNCF project) deploy to Multicloud + K8s Plugin is working and labeling Kubernetes nodes
Add registrationHandler to K8s Plugin and expand K8s Plugin API to work with ESR VIM registration of K8s Clusters
- Use POST/DELETE/GET of http://{{MSB_IP}}:{{MSB_PORT}}/api/multicloud-k8s/v1/{{cloud-owner}}/{{cloud-region-id}}/registry
- Ensure registrationHandler can get K8s feature labels - (labels discovered and placed by NFD representing hardware features)
- Ensure registrationHandler can populate A&AI cloud-region/tenant/compute flavors based on cluster under registration
- Register K8s cluster internally with the K8s Plugin
Add Node App in K8s Plugin to retrieve node labels from a cluster
Identify and Address any gaps in policy and OOF to do match making of CNFs/VNFs using K8s Plugin