Modern software development faces challenges around smaller teams, changing technologies, and platform agility. This document discusses using Consul for service discovery and configuration with Spring Boot applications. It provides an example of a basic Spring Boot invoice and tax service, and how Consul allows the services to dynamically discover and register each other without needing to know configuration details. The document demonstrates the advantages of Consul and Spring Boot including monitoring, deployment flexibility, and separation of environments. It provides instructions for setting up a local Consul development environment and links to example code and documentation.

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© 2016 Pivotal
Advanced Spring Boot with Consul
Mike Gendelman, Systems Mgmt. Architect, Nomura
@MikeGendelman

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Agenda
§ Modern Software Development Challenges
§ Review of Basic Spring Boot Applications
§ Enhanced Spring Boot Applications with Consul
§ Demo
§ Next Steps

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Modern Software Development Challenges
§ Development Teams
• Smaller teams
• Turnover
• Quickly changing technology
§ Platform Agility
• Containers, public clouds, private clouds and hybrid
• Migration on its own does not improve the applications
§ Regulatory & Compliance

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Agenda
§ Modern Software Development Challenges
§ Review of Basic Spring Boot Applications
§ Enhanced Spring Boot Applications with Consul
§ Demo
§ Conclusion

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Simple Spring Boot Applications
Invoice
Service
§ Invoice Service calls the Tax Service to calculate tax
§ Location of Tax Service must be known by the Invoice Service
§ Two basic Spring Boot applications
Tax
Service

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Standard Spring Boot Rest POM

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Standard Spring Boot Rest Application

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Standard Spring Boot Rest Controller

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Standard Spring Boot application.yml

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Agenda
§ Modern Software Development Challenges
§ Review of Basic Spring Boot Applications
§ Enhanced Spring Boot Applications with Consul
§ Demo
§ Conclusion

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Consul
“
Consul provides first-class support for
service discovery, health checking, K/
V storage, and multiple datacenters.
Consul.io

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Spring Boot with Consul
Invoice
Service
Consul
Agent
Tax
Service
Consul
Server
§ Consul Agent
• Health Check
• Forward Queries
§ Consul Server
• Store Data
• Respond to Queries
• Leader Election

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Spring Boot with Consul
Spring Boot
Application
Configuration
Service Registration
Service Discovery
Service Health
Consul
Spring Cloud
Consul

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Advantages
Monitoring Deployment Configuration
• Update at run-time
• No local configuration
• Dynamic discovery of
endpoints
• Start order does not
matter
• Simple deployment
• Separation of
environments
• Discover services to
monitor
• Health of the service is
more important than
the heath of a single
instance

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Spring Boot Rest POM + Consul

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Spring Boot Rest Application + Consul

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Spring Boot Rest Controller + Consul

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Spring Boot Bootstrap.yml for Consul

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Calling the Tax Service
restTemplate.getForObject("http://"+host + ":" + port
+"/tax/{subtotal}",Double.class, subtotal );
restTemplate.getForObject("http://tax-service/tax/
{subtotal}",Double.class, subtotal );
With Consul
Without Consul

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Add the Properties to Consul

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The New Service

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Setting Up Consul
§ Requires at least three Consul Servers per cluster for establish quorum
§ Every host must run a consul agent
§ Agents are stateless and forward all request to the servers
§ Same executable can be started as a server or an agent
§ Recommend different clusters for production and non-production
§ Development environment can be setup with a single local instance:
consul agent –dev -ui

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Demo
SPRING BOOT & CONSUL

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Next Steps
https://github.com/mgendelman/spring-boot-consul-demo-tax.git
https://github.com/mgendelman/spring-boot-consul-demo-invoice.git
https://www.consul.io/
https://cloud.spring.io/spring-cloud-consul/