Kubernetes-based Microservice Observability with Istio Service Mesh
Source code for the two-part blog post, Kubernetes-based Microservice Observability with Istio Service Mesh. See the post for detailed instructions.
Frontend UI
An Angular 12 front-end UI to the API is located on Github: k8s-istio-observe-frontend.
Reference Platform Architecture
Service Responses
On the reference platform, each upstream service responds to requests from downstream services by returning a small informational JSON payload (termed a greeting in the source code).
{
"id": "fc65e292-eb40-43ee-810f-f819764cae61",
"service": "Service-A",
"message": "Hello, from Service-A!",
"created": "2021-05-22T23:31:10.489864529Z"
}Complete response from Service A
[
{
"id": "c90f542d-22e6-401c-8361-422fea719f15",
"service": "Service-D",
"message": "Shalom (שָׁלוֹם), from Service-D!",
"created": "2021-05-22T23:31:10.402441212Z"
},
{
"id": "713156eb-f91c-4591-ab51-07d107185d61",
"service": "Service-G",
"message": "Ahlan (أهلا), from Service-G!",
"created": "2021-05-22T23:31:10.4324182Z"
},
{
"id": "22bdf2c8-1262-441e-b799-b3c4d68392df",
"service": "Service-H",
"message": "Ciao, from Service-H!",
"created": "2021-05-22T23:31:10.454751483Z"
},
{
"id": "f292a648-0f35-4248-8852-fde4035052dc",
"service": "Service-E",
"message": "Bonjour, from Service-E!",
"created": "2021-05-22T23:31:10.468721423Z"
},
{
"id": "523ddd56-5068-4d32-83dc-511545fc5fbb",
"service": "Service-B",
"message": "Namasté, from Service-B!",
"created": "2021-05-22T23:31:10.469495924Z"
},
{
"id": "d6cca80b-f238-428d-9db9-3658ba072e1e",
"service": "Service-C",
"message": "Konnichiwa (こんにちは), from Service-C!",
"created": "2021-05-22T23:31:10.471593632Z"
},
{
"id": "fc65e292-eb40-43ee-810f-f819764cae61",
"service": "Service-A",
"message": "Hello, from Service-A!",
"created": "2021-05-22T23:31:10.489864529Z"
}
]Optional Docker Swarm Deployment
In addition to Kubernetes, you can deploy the reference platform to Docker Swarm. Create Docker overlay network, and deploy Docker Swarm, locally, consisting of (12) containers:
- (1) Angular 12 frontend UI
- (8) backend Go-based microservices
- (1) RabbitMQ server with (1) queue
- (1) MongoDB server with (4) databases
- (1) Mongo Express
docker network create -d overlay --attachable golang-demo
docker stack deploy -c docker_swarm/stack.yml golang-demoView the Running Stack
> docker stack services golang-demo --format "table {{.Name}}\t{{.Image}}\t{{.Ports}}" | sort
NAME IMAGE PORTS
golang-demo_angular-ui garystafford/angular-observe:1.6.5 *:80->80/tcp
golang-demo_mongodb mongo:4.4.6 *:27017->27017/tcp
golang-demo_mongo_express mongo-express:0.54.0 *:8081->8081/tcp
golang-demo_rabbitmq rabbitmq:3.8.16-management-alpine *:5672->5672/tcp, *:15672->15672/tcp
golang-demo_service-a garystafford/go-srv-a:1.6.5 *:8080->8080/tcp
golang-demo_service-b garystafford/go-srv-b:1.6.5
golang-demo_service-c garystafford/go-srv-c:1.6.5
golang-demo_service-d garystafford/go-srv-d:1.6.5
golang-demo_service-e garystafford/go-srv-e:1.6.5
golang-demo_service-f garystafford/go-srv-f:1.6.5
golang-demo_service-g garystafford/go-srv-g:1.6.5
golang-demo_service-h garystafford/go-srv-h:1.6.5
Accessing the Docker Swarm-based Stack
To start, call the Angular 12 Frontend UI: http://localhost
The backend API's URL will be: http://localhost:8080
Alternately, call Service A, the system's edge service, directly: http://localhost:8080/api/greeting
To observe the queue traffic, use the RabbitMQ Management Console: http://localhost:15672
To observe the databases, use Mongo Express: http://localhost:8081
View of UI running on Docker
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