Microservices with Docker and Weave

Transcript

1. Microservices with Docker and Weave Johann Romefort
2. About me… • Startup guy, last past 7 years in SF • Consulting/training in the container space @ http://containera.io • Organizer of Docker/CoreoS meetup in Munich/Berlin
3. Microservices? - Martin Fowler “Microservices are an approach to developing a single application as a suite of small, connected, services” “Loosely coupled service orientated architecture with bounded contexts” - Adrian Cockcroft
7. Microservices • Small units, composable • Single purpose • Separation of concerns
8. Containers • Easy to use • Single Purpose environment • Fully encapsulated • Lightweight (vs VM which are ok for monoliths) • BUT: Getting complicated when you move from single host to multi-host
9. Containers for Microservices Deployement • Scale from laptop to cloud • Many can be run on a single host without impacting each other • Quick to launch and kill • Easy to integrate in your CI solution • Containers are portable and lightweight
10. Weave • Allows containers to all behave as if they were connected to the same physical network switch With the same interface and no application changes
11. Single Host
12. Multiple Hosts
13. Multiple Clouds
14. Real World Deployment
15. Weave Philosophy • No need to learn an API or change your application • Software network layer 2 and 3. You can use your regular operational tools • No assumption about anything like which Weave node should start before another
16. Weave Philosophy • Not a system of record: No consensus/ synchronization protocol • Nodes don’t have to agree, things can start in any order • If your application depends on some synchronization/election, then go one level above and use Zookeeper, etcd, consul
17. Weave features • Multi-Datacenter support • Traverse firewalls • Encrypted links • Multi-hop routing • Container mobility • Fault tolerance • Multicast
18. What about Service Discovery in Microservices? • Service Discovery is key to micro services • DNS is a good way to keep it simple
19. WeaveDNS • No need to do port mapping - eliminate use cases for service discovery • Automatically (de)register services using DNS • Container Health - WeaveDNS monitor container and remove it if it dies
20. WeaveDNS • DNS for containers • Nothing to configure • nothing to maintain • no change request to submit when you need a new name for your microservice.
21. WeaveDNS
22. Demo Time?
23. Demoing these features: • Extending local dev environment with Multi-host networking • Multi-Datacenter support • Multi-hop routing • Container mobility • Fault tolerance
24. DEMO • Container linked on a local weave • Launch Weave on localhost • Service1 (weave run) ping service2 • Service2 (weave attach)
25. Extending localhost with multi-host networking 10.2.1.1 10.2.1.2 10.2.1.3 Weave Router Weave Router localhost Azure Cloud
26. Container Mobility • kill Service2 and move it to cloud • Launch weave on Azure(weave connect from localhost to Azure) • launch Service2 with same ip as localhost
27. Container Mobility 10.2.1.1 10.2.1.3 Weave Router Weave Router 10.2.1.2 localhost Azure Cloud Kill 10.2.1.2 on localhost and re-instantiate it on Azure
28. WeaveDNS Demo • Launch weaveDNS • Create service1 on localhost • Create service2 on Azure • ping service2 from service1
29. WeaveDNS demo service1 service2 Weave Router Weave Router Weave DNS Weave DNS localhost Azure Cloud
30. Failover with WeaveDNS • create service2 on DigitalOcean • kill service2 on Azure • ping service2 from service1 and see how service is still ping-able but IP changed
31. FailOver using WeaveDNS service1 service2 Weave Router Weave Router Weave DNS Weave DNS localhost Azure Cloud service2 Weave Router Weave DNS DigitalOcean
32. Weave Roadmap • IP Allocation Manager (IPAM): remove the burden of having to allocate IP for each containers • Fast Data path, improve network performance by using OpenVSwitch module in linux kernel. • Working with Docker team to create an extension API, removing need for a weave script that wrap the docker command
33. Thank you! twitter: @romefort email: romefort@gmail.com http://news.containera.io
34. http://weave.works