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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:

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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

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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 installed.

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

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

Explore

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Istio Features

Distributed Tracing

First, let's generate some traffics in the application, access the following URLs with curl command or open them in the browser

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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 httpat http://node_ip:30088/dotviz or httpdotviz or http://node_ip:30088/force/forcegraph.html/forcegraph.html, you should see the service graph:

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Metrics Visualization

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

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

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