A demonstration of using Consul Connect service discovery and Traefik reverse proxy and load balancer with Spring Boot application.

Traefik is a dynamic reverse proxy. ConsulConnect is a service discovery server. Traefik uses ConsulConnect as a backend. SpringBoot application registers a service to Consul with Traefik specific metadata. Traefik adds a new route using this metadata.

Start Portainer, Consul and Traefik:

docker-compose up -d portainer traefik consul

Open browser:

• Portainer https://localhost:9000
• Consul https://localhost:8500
• Traefik https://localhost:8080

Build backend service and frontend application:

./build.sh
docker-compose up -d

Check that there are user-repository-v1 and user-application-v1 services in Consul: https://localhost:8500

1. Stop user-repository in Portainer
2. Note that user-repository-v1 shows error in Consul
3. Start user-repository in Portainer
4. Note how quickly user-repository-v1 becomes available in Consul

Traefik shows a http port for user-application: https://localhost:8080

Application should be available through reverse proxy: https://localhost/users

1. Login to application https://localhost/users
2. Note service logs in Portainer

Traefik also show alternative address for Consul: https://https://consul.docker.localhost

scale services:

docker-compose up -d --scale user-repository=2

1. Portainer shows two instances for user-repository
2. Consul shows two instances of service user-repository-v1
3. Trafik shows two instances
4. Login to application
5. Note service logs in Portainer
6. Refresh application or logout/login
7. Note service logs in Portainer, services are called in round-robin manner

1. Login to application
2. Note the runtime environment value in footer
3. Add config value to Consul: config/user-application/runtime/environment=production
4. Refresh application view in browser
5. Note the new runtime environment value
6. Note the application log in Portainer