Page Comparison

Table of Contents

Introduction

...

Table of Contents

Introduction

In Casablanca release, MSB project is integrating Istio Service Mesh with ONAP to manage ONAP microservices. Istio Service Mesh is a dedicated infrastructure layer to connect, manage and secure microservices, which brings the below benefits:

• Stability and Reliability: Reliable communication with retries and circuit breaker 
• Security: Secured communication with TLS 
• Performance: Latency aware load balancing with warm cache
• Observability: Metrics measurement and distributed tracing without instrumenting application 
• Manageability: Routing rule and rate limiting enforcement 
• Testability: Fault injection to test resilience of the services

Installation

...

Download installation scripts with git clonefrom ONAP Gerrit:

Code Block
language bash theme RDark
git clone https://github.com/zhaohuabing/istio-install-scripts.gitgerrit.onap.org/r/msb/service-mesh

Kubernetes Master

We need Kubernetes1.9 or newer to enable automatic sidecar injection, so we don't have to modify every individual ONAP kubernetes yaml deployment files to add the sidecar container, which would be inconvenient.

...

Webhook and other needed features have already been configured in the install scripts to enable Istio sidecar injection.

Create the Kubernetes master by running this script:

cd istioservice-mesh/install-scripts/
./1_install_k8s_master.sh

This script will create a Kubernetes master node with Kubeadm and install calico network plugin. Some other needed tools such as Docker, Kubectl and Helm will also be installedHelm will be installed as well.

From the output of the script, you should see a command on how to join a node to the created Kubernets cluster. Note that this is an example, the token and cert-hash of your installation will be different, please copy & paste the command to somewhere, we will need it later.

You can now join any number of machines by running the following on each node
as root:

  kubeadm join 10.12.5.104:6443 --token 1x62yf.60ys5p2iw13tx2t8 --discovery-token-ca-cert-hash sha256:f06628c7cee002b262e69f3f9efadf47bdec125e19606ebff743a3e514a8383b

Kubernetes worker Node

Log in the worker node machine, run this script to create a kubernetes worker node:

./2_install_k8s_minion.sh

...

In the transition phase, the Istio sidecar injector policy is configured as "disabled" when installing Istio. So the sidecar injector will not inject the sidecar into pods by default. Add the `sidecar.istio.io/inject annotation` with value `true` to the pod template spec to enable injection.

Note: when all ONAP projects are ready for Istio integration, the Istio sidecar injector policy could be configured as "enabled", the annotation in the pod will not be necessary any more.

Enable Istio sidecar injection webhook.

...

Example:

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: {{ include "common.fullname" . }}
  namespace: {{ include "common.namespace" . }}
  labels:
    app: {{ include "common.name" . }}
    chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
    release: {{ .Release.Name }}
    heritage: {{ .Release.Service }}
spec:
  replicas: {{ .Values.replicaCount }}
  selector:
    matchLabels:
      app: multicloud-vio
  template:
    metadata:
      labels:
        app: {{ include "common.name" . }}
        release: {{ .Release.Name }}
      name: {{ include "common.name" . }}
      annotations:
        sidecar.istio.io/inject: "{{.Values.istioSidecar}}"

Note: when all ONAP projects are ready for Istio integration, the Istio sidecar injector policy could be configured as "enabled", then the annotation in the pod will not be necessary any more.

Enable Istio sidecar injection webhook.

kubectl create namespace onap
kubectl label namespace onap istio-injection=enabled

...

In Casablanca, MSB project is working with VF-C and MultiCloud to verify Istio integration, so we are focusing on these three projects right now. More projects will engage later.as pilot projects, we would like to roll out it to the other ONAP projects after verifying the integration and Istio features.

helm install local/msb -n msb --namespace onap
helm install local/vfc -n vfc --namespace onap
helm install local/multicloud -n multicloud --namespace onap

Note that you can also install other ONAP projects with helm install if they are needed. But Istio sidecar will not be injected to their Pods by default.

Confirm that ONAP microservices have been started

...

You can open the MSB portal http://Node_IP:30280/iui/microservices/default.html in the browser to see all the registered services.

Image RemovedImage Added

Explore Istio Features

...

Then open your browser at http://tracing_node_ip:tracing_node_port/, you should see something similar to the following:

Note

• Tracing_node_port can be found by 'kubctl get svc -n istio-system'.
• ONAP microservices need to propagate the appropriate HTTP headers so that when the proxies send span information, the spans can be correlated correctly into a single trace.

Service Graph

Istio provides a Servicegraph service which generates and visualizes graph representations of the services in the mesh.

Open your browser at http://node_ip:30088/dotviz or http://node_ip:30088/force/forcegraph.html, you should see the service graph:

 Image Modified

Metrics Visualization

Istio automatically gather gathers telemetry for services in a mesh. A Promeheus adapter is plugged into Mixer to serve the generated metric dataA Prometheus adapter is plugged into Mixer to serve the generated metric data. A Grafana addon is pre-configured with a Prometheus data source and the and has an Istio Dashboard dashboard installed for the metric visualization.

Open your browser at http://node_ip:30300, you should see the Grafana Istio dashboard:

...