Microservices 2.0

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Varnish Software

Varnish Summit 2016

Technologie

Varnish Software
Marius Magureanu
software developer
marius@varni-sh.com

Microservice
instrumentation with
Varnish

Life after APIs…
How about
Microservices?

Microservices (1/2)
• Application pattern used for the last couple
of years
• Reduces complexity by having small (micro)
services that are relatively simple
• Distributed application

Microservices (2/2)
• Increase development velocity
• Problem: Massive increase in the number of
HTTP calls

Gains
• Centralise caching and invalidation
• Allows for stateless micro-services
• Add resiliency and monitoring

title_lu
page_comp
artd autho
corr
30ms
10ms
55ms
40m
s
98ms

Changes needed
• Add the parent ID of call to the response 
• Any annotations that should be added as
well 
• ModifyVCL to add parent ID of cached
responses

GET /baz HTTP/1.1
Host: api.acme.com 
Apikey: 
Trace-id: 6382 
Span: 6731 
Parent-Span: 6636 
3e707fd1d239b3978d45

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Microservices 2.0

1. Varnish Software Marius Magureanu software developer marius@varni-sh.com

2. Microservice instrumentation with Varnish

3. Life after APIs… How about Microservices?

4. Microservices (1/2) • Application pattern used for the last couple of years • Reduces complexity by having small (micro) services that are relatively simple • Distributed application

5. Microservices (2/2) • Increase development velocity • Problem: Massive increase in the number of HTTP calls

6. zoo baz bar foo service directory

7. Varnish in a microservice architecture

8. quu zoo baz bar foo varnish

9. Gains • Centralise caching and invalidation • Allows for stateless micro-services • Add resiliency and monitoring

10. Proﬁling micro-services is hard

11. title_lu page_comp artd autho corr 30ms 10ms 55ms 40m s 98ms

12. Changes needed • Add the parent ID of call to the response  • Any annotations that should be added as well  • ModifyVCL to add parent ID of cached responses

13. GET /baz HTTP/1.1 Host: api.acme.com  Apikey:  Trace-id: 6382  Span: 6731  Parent-Span: 6636  3e707fd1d239b3978d45

14.

15. https://github.com/varnish/zipnish

16. Thanks