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Integrating Nodeinto your ecosystem
hello worldAlex Liu @stinkydofu aliu@netflix.com
node.js
$ npm install service-discovery npm ERR! 404 Not Found
$ npm install dynamic-config npm ERR! 404 Not Found
$ npm install metrics-client npm ERR! 404 Not Found
What is your goal?answer the simple questions first.
“ I want to use …
“ I want to use node.js
“ I don’t want to rebuild my entire app
“ I want to move incrementally
“ I am going off the paved road
The 6 Step Plan( aka, The Netflix Story™ )
1Identify your ecosystem.
What does your ecosystem look like?
your answer can make a difference!
monolithic applicationA single-tiered software application in which the user interface and data access code are combined into a single program from a single platform.
data access logic
business logic
UI
database
data access logic
business logic
UI
data access logic
business logic
UI
SOA (service oriented architecture)
A design pattern based on distinct pieces of software providing application functionality as services to other applications via a protocol.
UI
service
business logic
serviceservice
business logicbusiness logic
REST all the things!
service
service
service
service
service
service
service
service
service
service
service
service
2Use configurable
routing
reverse proxy
/home
/test
service
service
service
Use a reverse proxy as a configurable
routing layer.top tip
/home
/profile
Control
Test
90%
10%
US
EU
ON
OFF
Avoid subdomains.
top tip
3Identify necessary
ecosystem services.
service discoverydiscover, and be discovered
service discovery> registration > health check> client discovery
configurationconfiguration management on
a per environment basis
configuration> storage > (de-)centralized config> dynamic config
observability is of the utmost importance
metrics
> observability > real time metrics> monitoring > alerts > logging vs. metrics
metrics
determine your minimum units of deployment
build + deploy
> VMs > AMIs> CI + CD> Docker
build + deploy
What are our options?
4Rebuild or reuse?
Measure success by the cost of maintenance.
top tip
Rebuild
It’s an opportunity for a fresh start.
Rebuild
Lightweight modules are great for prototyping.
Rebuild
Don’t rebuild your entire ecosystem.
Rebuild
Chicken, meet Egg.
Reuse
You’re not reinventing the wheel.
Reuse
You can reduce overall platform
maintenance cost.
Reuse
It’s a medium-term migration strategy.
Reuse
You can stay focused on your goal.
Reuse
> reverse proxy / configurable routing > service discovery> service client(s) > configuration > metrics > build + deployment
But it’s not JavaScript. :(
5Add a sidecar to
reuse existing code.
sidecarA process which runs on instance along with your application, hosting all the things necessary for it to integrate seamlessly within an existing ecosystem.
main process sidecar
J
main process sidecar
service
service
service
Don’t add new functionality in your sidecar.
sidecar top tip
> configuration > metrics collection
ReuseRebuild> dynamic configuration > configurable routing > service discovery> builds + deployment > metrics reporting
Use light weight modules.
sidecar top tip
[LIGHT] config client
[FULL] config client
http://127.0.0.1/config?id=configA&id=configB&id=configC
[LIGHT] config client
[FULL] config client
http://127.0.0.1/config?id=configA&id=configB&id=configC
[LIGHT] config client
[FULL] config client config
service
[LIGHT] config client
[FULL] config client
> serialization > deserialization > caching + TTL > retries > env logic
> REST calls
config service
The sidecar is a black box.
sidecar top tip
[LIGHT] config client
[FULL] config client
> serialization > deserialization > caching + TTL > retries > env logic
> REST calls
config service
[LIGHT] config client
> REST calls
config service
[LIGHT] config client
> REST calls
config service
config service
[FULL] config client
> serialization > deserialization > caching + TTL > retries > env logic
metrics [collection]
metrics [reporting]
Watch your resource
management.sidecar top tip
inbound outbound
inbound outbound
inbound outbound
inbound outbound
Real time metrics are a must.
sidecar top tip
Sidecar
Pranahttps://github.com/Netflix/Prana
6node.js it up!
Don’t worry, I got it.
thank youAlex Liu @stinkydofu aliu@netflix.com
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