Microservices 2.0

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This document discusses using Varnish in a microservices architecture. It notes that microservices increase development velocity but can massively increase the number of HTTP calls. Varnish can help by centralizing caching and invalidation, allowing stateless microservices and adding resiliency and monitoring. The document recommends modifying Varnish configuration language (VCL) to add parent IDs to cached responses to help with profiling microservices.

Technology

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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