Spring Cloud Demo Project
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The demo project is initialized from https://github.com/carnellj/spmia-chapter10. Additions are:

  • Code cleanup, bug fix, and better comments.
  • Java 9+ support.
  • Spring Boot 2.0 migration.
  • Switch from Postgres to MySQL, and from Kafka to RabbitMQ.
  • Easier local debugging by switching off service discovery and remote config file lookup.
  • Kubernetes support.
  • Swagger Integration.
  • Spring Boot Admin Integration.

The project includes:

  • eureka-server: Service for service discovery. Registered services are shown on its web frontend, running at 8761 port.
  • config-server: Service for config file management. Config files can be accessed via: http://${config-server}:8888/${appname}/${profile}. Where ${appname} is spring.application.name and ${profile} is something like dev, prd or default.
  • zipkin-server: Service to aggregate distributed tracing data, working with spring-cloud-sleuth. It runs at 9411 port. All cross service requests, message bus delivery are traced by default.
  • zuul-server: Gateway service to route requests, running at 5555 port.
  • authentication-service: OAuth2 enabled authentication service running at 8901. Redis is used for token cache. JWT support is also included. Spring Cloud Security 2.0 saves a lot when building this kind of services.
  • organization-service: Application service holding organization information, running at 8085. It also acts as an OAuth2 client to authentication-service for authorization.
  • license-service: Application service holding license information, running at 8080. It also acts as an OAuth2 client to authentication-service for authorization.
  • config: Config files hosted to be accessed by config-server.
  • docker: Docker compose support.
  • kubernetes: Kubernetes support.

NOTE: The new OAuth2 support in Spring is actively being developed. All functions are merging into core Spring Security 5. As a result, current implementation is suppose to change. See:

Tested Dependencies

  • Java 8+
  • Docker 1.13+
  • Kubernetes 1.11+

Building Docker Images

export BUILD_NAME=2.0.0
mvn clean package docker:build

In case of running out of disk space, clean up unused images and volumes with:

docker rmi $(docker images -f "dangling=true" -q)
docker volume prune

Running Docker Compose

export BUILD_NAME=2.0.0
docker-compose -f docker/docker-compose.yml up

Or with separate services:

docker-compose -f docker/docker-compose.yml up authentication-service organization-service license-service

Running Kubernetes

NOTE: Kubernetes does not support environment variable substitution by default.

kubectl create -f kubernetes/kubernetes.yml

Use Cases

Suppose you are using the kubernetes deployment.

Get OAuth2 token

curl is used here, and 31004 is the cluster-wide port of the Zuul gateway server:

# curl -u eagleeye:thisissecret -X POST -d "grant_type=password&scope=webclient&username=user&password=password1"

Get organization info

Use the token returned from previous request.

# curl -H "Authorization: Bearer d3b817dc-fb7a-4e65-a080-d0e34c0dc4d5"
{"id":"e254f8c-c442-4ebe-a82a-e2fc1d1ff78a","name":"customer-crm-co","contactName":"Mark Balster","contactEmail":"mark.balster@custcrmco.com","contactPhone":"823-555-1212"}

Get license info associated with organization info

Use the token returned from previous request.

# curl -H "Authorization: Bearer d3b817dc-fb7a-4e65-a080-d0e34c0dc4d5"
{"id":"f3831f8c-c338-4ebe-a82a-e2fc1d1ff78a","organizationId":"e254f8c-c442-4ebe-a82a-e2fc1d1ff78a","organizationName":"customer-crm-co","contactName":"Mark Balster","contactPhone":"823-555-1212","contactEmail":"mark.balster@custcrmco.com","productName":"CustomerPro","licenseType":"user","licenseMax":100,"licenseAllocated":5,"comment":null}

Distributed Tracing via Zipkin

Every response contains a correlation ID to help diagnose possible failures among service call. Run with curl -v to get it:

# curl -v ...
< sc-correlation-id: 3265b50156556c05

Search it in Zipkin to get all trace info, including latencies if you are interested in. zipkin-1 zipkin-2

The license service caches organization info in Redis, prefixed with organizations:. So you may want to clear them to get a complete tracing of cross service invoke.

redis-cli -h -c del $(redis-cli -h -c keys organizations* | gawk '{ print $1 }')

Working with OAuth2

All OAuth2 tokens are cached in Redis, prefixed with oauth2:. There is also JWT token support. Comment/Uncomment @Configuration in AuthorizationServerConfiguration and JwtAuthorizationServerConfiguration classes to switch it on/off.

Swagger Integration

The organization service and license service have Swagger integration. Access via /swagger-ui.html.

Spring Boot Admin Integration

Spring Boot Admin is integrated into the eureka server. Access via: http://${eureka-server}:8761/admin. sba-1