Introduction to Consul

Introduction to Consul and service discovery

Transcript

1. Consul Base features available (Consul, ETCD and Zookeeper) • Support for both REST API and DNS. • Distributed Configuration / Key Value storage • TLS Support
2. Consul Primary features • Built for service discovery (ETCD and Zookeeper are pure key value stores) • Health checks (ETCD and Zookeeper only support time to live entries) • Context Aware services by tagging individual instances. • Commercial Support exists • A Complete Product Supports everything from service discovery, distributed configuration, DNS support out of the box, competitors need extra tools. • Scalable scales to many thousands of nodes, far more than what we need
3. Consul Additional features • Easy to set up, works in dev environment. • Easy to use Web UI built in for development environments. • Fast, agents run on each server, sub millisecond lookups. • Access Control Lists, limit access to key value store • Multi Datacenter support, if we need. • Push events between nodes • Event Subscription (via long polling) status changes
4. Adopting Microservices Customer If you don’t like the term, Think multiple instances instad
5. Adopting Microservices Customer Bounded Contexts Login Registration Customer Data
6. Scaling Microservices A microservice architecture puts each element of functionality into a separate service… …and scales by distributing these services across servers, replicating as needed -Martin Fowler, James Lewis
7. Scaling Microservices Where are you guys!? I’m over here!
8. Service Discovery Service Registry Publish ”I am A” @1.2.4.6:4040 Publish ”I am B” @1.2.3.4:5000 Service A Service B
9. Service Discovery Service Registry Lookup ”Where is B?” Service A Service B
10. Service Discovery Service Registry Service A Service B B is at address 1.2.3.4:5000
11. Service Discovery Service Registry Call 1.2.3.4:5000 Service A Service B
12. Redundancy Service A3 Service A2 Service A1 Service B2 Service B1 Service B3 Service Registry
13. Health Checks Service Registry Are you Alive? Service A Service B Yes!
14. Login • Triobet • MGA Login • Triobet • EE Login • Triobet • LV Login • Triobet • LV • VIP Context Aware Same service Different contexts Service Registry
15. Login • Triobet • MGA Login • Triobet • EE Login • Triobet • LV Login • Triobet • LV • VIP Context Aware Service Registry Lookup Where is ”Login” for Triobet, LV, VIP
16. Highly Available Cluster Agent Agent Agent Agent Agent Server Server Server All state is replicated to agents Server Cluster
17. Highly Available Cluster Agent Agent Agent Agent Agent Server Server Server This agent still has data Server Cluster BAM
18. Consul enables • High Availability via redundant service instances • Scalability by load balancing over multiple instances • Context Aware by tagging service instances • Distributed Configuration • Circuit Breaker by removing overloaded services from the service discovery